diff --git a/pkg/analysis_server/test/verify_sorted_test.dart b/pkg/analysis_server/test/verify_sorted_test.dart index 4b40969a15f0..06c1f18b6c94 100644 --- a/pkg/analysis_server/test/verify_sorted_test.dart +++ b/pkg/analysis_server/test/verify_sorted_test.dart @@ -31,10 +31,6 @@ void main() { group('linter', () { buildTestsForLinter(); }); - - group('nnbd_migration', () { - buildTestsForNnbdMigration(); - }); } void buildTests({ @@ -67,7 +63,6 @@ void buildTestsForAnalysisServer() { // remove these exclusions. 'lib/protocol/protocol_constants.dart', 'lib/protocol/protocol_generated.dart', - 'lib/src/edit/nnbd_migration/resources/resources.g.dart', 'test/integration/support/integration_test_methods.dart', 'test/integration/support/protocol_matchers.dart', // The following are not generated, but can't be sorted because they contain @@ -124,12 +119,6 @@ void buildTestsForLinter() { ]); } -void buildTestsForNnbdMigration() { - buildTests( - packagePath: 'nnbd_migration', - excludedPaths: ['lib/src/front_end/resources/resources.g.dart']); -} - void buildTestsIn(AnalysisSession session, String testDirPath, List excludedPath, Folder directory) { var pathContext = session.resourceProvider.pathContext; diff --git a/pkg/nnbd_migration/.gitignore b/pkg/nnbd_migration/.gitignore deleted file mode 100644 index 7138b41f8afe..000000000000 --- a/pkg/nnbd_migration/.gitignore +++ /dev/null @@ -1,3 +0,0 @@ -lib/src/front_end/resources/*.js.deps -lib/src/front_end/resources/*.js.map -lib/src/front_end/resources/migration.js diff --git a/pkg/nnbd_migration/CHANGELOG.md b/pkg/nnbd_migration/CHANGELOG.md deleted file mode 100644 index 66a6ebd68486..000000000000 --- a/pkg/nnbd_migration/CHANGELOG.md +++ /dev/null @@ -1,6 +0,0 @@ -## 0.1.1 -* Add README text indicating that this package should not be used; instead, - migrations should be launched using `dart migrate`. - -## 0.1.0 -* Separated from analysis_server project. diff --git a/pkg/nnbd_migration/LICENSE b/pkg/nnbd_migration/LICENSE deleted file mode 100644 index a0d5f5431886..000000000000 --- a/pkg/nnbd_migration/LICENSE +++ /dev/null @@ -1,27 +0,0 @@ -Copyright 2019, the Dart project authors. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are -met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following - disclaimer in the documentation and/or other materials provided - with the distribution. - * Neither the name of Google LLC nor the names of its - contributors may be used to endorse or promote products derived - from this software without specific prior written permission. - -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/pkg/nnbd_migration/OWNERS b/pkg/nnbd_migration/OWNERS deleted file mode 100644 index 80d5ff4f329a..000000000000 --- a/pkg/nnbd_migration/OWNERS +++ /dev/null @@ -1,2 +0,0 @@ -file:/tools/OWNERS_ANALYZER -file:/tools/OWNERS_FOUNDATION diff --git a/pkg/nnbd_migration/README.md b/pkg/nnbd_migration/README.md deleted file mode 100644 index 5b005f8fab4e..000000000000 --- a/pkg/nnbd_migration/README.md +++ /dev/null @@ -1,169 +0,0 @@ -# Null safety migration tooling - -**Note**: - - * This migration tool is now available through the SDK, using the `dart - migrate` command. Support for running it via `pub activate` is deprecated. - * The null safety migration tooling is in an early state and may have bugs and - other issues. - * As null safety is still in preview, we recommend only doing trial - migrations. The final migration of apps and packages should not be done - until the feature is more complete. - * For best results, use SDK version 2.9.0-10.0.dev or higher. - -## How migration works - -The migration uses a _new interactive algorithm_ designed specifically for [Dart -null safety](https://dart.dev/null-safety). - -Typical code migration tools are designed to be run once, handle most cases, and -let the developer do manual cleanup on the result. This does **not work well** -for null safety and attempting this workflow will result in a lot more manual -work. Similarly, after your migration has been applied, the migration **cannot -be rerun** without first reverting it. - -### Why does the interactive approach save so much time? - -Remember that Dart already has nullable types. Every type in old Dart code is -nullable! What old Dart lacks is _non-null_ types. - -And like most migrations, our tool tries to preserve your code's current -behavior. In the case of null safety, we may mark a lot of your types as -nullable -- because they really were nullable before. - -Nulls are traced through your program as far as they can go, and types are -marked nullable in this process. If the tool makes a single mistake or choice -you disagree with, it can lead to many excess nullable types. - -### Interactive feedback to the tool - -Unintentional null is the top cause of crashes in Dart programs. By marking your -intention with comments like `/*?*/` and `/*!*/`, we can stop these -unintentional nulls from spreading through your program in your migrated code. -Adding a small number of these hints will have a huge impact on migration -quality. - -The high level workflow of the tool is therefore driven through an interactive -web UI. After starting the tool with `dart migrate`, open the presented URL in a -browser. Scan through the changes, use the "nullability trace" feature to find -the best place to add a nullability hint (adding a hint in the best place can -prevent dozens of types from being made nullable). Rerun the migration and -repeat, committing the hints as you go. When the output is correct and -acceptable, apply the migration. - -For example, - -```dart -List ints = const [0, null]; -int zero = ints[0]; -int one = zero + 1; -List zeroOne = [zero, one]; -``` - -The default migration will be backwards compatible, but not ideal. - -```dart -List ints = const [0, null]; -int? zero = ints[0]; -int one = zero! + 1; -List zeroOne = [zero, one]; -``` - -`zero` should not be marked nullable, but it is. We then have cascading quality -issues, such as null-checking a value that shouldn't have been marked null, and -marking other variables as null due to deep null tracing. We can fix this all by -adding a single `/*!*/` hint. - -```dart -List ints = const [0, null]; -int/*!*/ zero = ints[0]!; // Just add /*!*/ here, the migration tool does the rest! -int one = zero + 1; -List zeroOne = [zero, one]; -``` - -If you add one hint before migrating, you have done the equivalent of making -five manual edits after migrating. To find the best place to put your hints, use -the preview tool's nullability trace feature. This lets you trace back up to the -root cause of any type's inferred nullability. Add hints as close to the -original source of null as possible to have the biggest impact to the migration. - -**Note**: The migration tool **cannot be rerun on a migrated codebase.** At -that point in time, every nullable and non-nullable type is indistinguishable -from an **intentionally** nullable or non-nullable type. The opportunity to -change large numbers of types for you at once without also accidentally changing -your intent has been lost. A long migration effort (such as one on a large -project) can be done incrementally, by committing these hints over time. - - - -## Migrating a package - -1. Select a package to work on, and open a command terminal in the top-level of - the package directory. -2. Run `pub get` in order to make available all dependencies of the package. -3. It is best to migrate a package to null safety _after_ the package's - dependencies have migrated to null safety. Run - `pub outdated --mode=null-safety` to learn the migration status of the - package's dependencies. See the - [pub outdated documentation](https://dart.dev/tools/pub/cmd/pub-outdated) - for more information. -4. It is best to migrate a package starting from a clean code repository state - (`git status`, for example), in case you must revert the migration. Ensure - there are no pending changes in the package's code repository. -5. Run the migration tool from the top-level of the package directory: - - ``` - dart migrate - ``` - -The migration tool will display a URL for the web interface. Open that URL in a -browser to view, analyze, and improve the proposed null-safe migration. - -## Using the tool - -1. Run the tool (see above). -2. Once analysis and migration is complete, open the indicated URL in a browser. -3. Start with an important or interesting file in your package on the left side - by clicking on it. -4. Look at the proposed edits in the upper right, and click on them in turn. -5. If you see an edit that looks wrong: - 1. Use the "trace view" in the bottom right to find the root cause - 2. Either click on an "add hint" button to correct it at the root, or open - your editor and make the change manually. - * Some changes are as simple as adding a `/*!*/` hint on a type. The - tool has buttons to do this for you. - * Others may require larger refactors. These changes can be made in - your editor. - * Changes may even be committed to source code management before finally - _applying_ the migration. In this way, a migration of a large package - can be carried out over multiple sessions, or between multiple - engineers. Committing hints and other adjustments along the way helps - to separate the concerns of describing user intent vs committing to the - migration result. - 3. Periodically rerun the migration and repeat. -6. Once you are satisfied with the proposed migration: - 1. Save your work using git or other means. Applying the migration will - overwrite the existing files on disk. - * Note: In addition to making edits to the Dart source code in - the package, applying the migration edits the package's `pubspec.yaml` - file, in order to change the Dart SDK version constraints, under the - `environment` field, and the "Package Config" file, located in the - package's `.dart_tool` directory, named `package_config.json`. - 2. Apply the migration by clicking the `Apply Migration` button in the - interface. - 3. Tip: leaving the web UI open may help you if you later have test failures - or analysis errors. -7. Rerun `pub get`, then analyze and test your package. - 1. If there are new static analysis issues, or if a test fails, you may - still use the preview to help you figure out what went wrong. - 2. If large changes are required, revert the migration, and go back to step - one. The tool does not provide any revert capability; this must be done - via source code management (for example, `git checkout`). -8. Commit and/or publish your migrated null-safe code. - -## Providing feedback - -Please file issues at https://github.com/dart-lang/sdk/issues, and reference the -`area-migration` label (you may not be able to apply the label yourself). diff --git a/pkg/nnbd_migration/TRIAGE.md b/pkg/nnbd_migration/TRIAGE.md deleted file mode 100644 index 1abd578ac67e..000000000000 --- a/pkg/nnbd_migration/TRIAGE.md +++ /dev/null @@ -1,72 +0,0 @@ -# Triage Priorities for Dart Migration tool - -This document describes the relative priorities for bugs filed under the -`area-migration` tag in GitHub as in -[this search](https://github.com/dart-lang/sdk/issues?q=is%3Aopen+is%3Aissue+label%3Aarea-migration). -While there are always exceptions to any rule, in general try to align our -priorities with these definitions. - -To triage bugs, search for `area-migration` -[bugs that are not currently triaged](https://github.com/dart-lang/sdk/issues?q=is%3Aopen+is%3Aissue+label%3Aarea-migration+-label%3AP0+-label%3AP1+-label%3AP2+-label%3AP3+-label%3AP4) -and for each bug, mark priority based on how closely it matches with the below -constraints. - -## Migration tool triage priorities - -Descriptions here use [terms and definitions](#terms-and-definitions) from the -end of this document. If your bug doesn't precisely match one of these, -consider how impactful it is compared to examples given here and pick a priority -reflecting that. - -### P0 - -* Crashes that can't be worked around by `--ignore-exceptions`, typical impact or widespread. -* Crashes that can be worked around by `--ignore-exceptions`, widespread. - -### P1 - -* Crashes that can be worked around by `--ignore-exceptions`, typical impact. -* An enhancement required for critical milestones for key users, or that has - significant evidence gathered indicating a positive impact if implemented. -* A problem that is significantly impairing a key user's ability to migrate - their code. - -### P2 - -* Crashes, edge case. -* An enhancement with typical impact that doesn't fit the criteria above but - would still be significantly beneficial to users (i.e. more than just a "would - be nice" feature). -* A problem with typical impact that doesn't fit the criteria above, but impairs - users' ability to migrate their code. - -### P3 - -* Crashes, theoretical. -* An enhancement that doesn't fit the criteria above. -* A problem that doesn't fit the criteria above, but impairs users' ability to - migrate their code. - -## Terms and definitions - -### Terms describing impact - -* "widespread" - Impact endemic throughout the ecosystem, or at least far - enough that this is impacting multiple key users. -* "typical impact" - Known to impact a key user, or likely to impact a - significant percentage of all users. Issues are assumed to have typical - impact unless we have evidence otherwise. -* "edge cases" - Impacting only small parts of the ecosystem. For example, one - package, or one key user with a workaround. Note this is an edge case from - the perspective of the ecosystem vs. language definition. Note that since the - migration tool is still in an early adoption phase, if a bug has only been - reported by one user, that's not sufficient evidence that it's an edge case. - To be considered an edge case, we need to have a concrete reason to suspect - that the bug is caused by an unusual pattern in the user's source code, or - unusual user behavior. -* "theoretical" - Something that we think is unlikely to happen in the wild - and there's no evidence for it happening in the wild. - -### Other terms - -* "key users" - Flutter, Pub, Fuchsia, Dart, Google3, 1P diff --git a/pkg/nnbd_migration/analysis_options.yaml b/pkg/nnbd_migration/analysis_options.yaml deleted file mode 100644 index 0032b11ad34d..000000000000 --- a/pkg/nnbd_migration/analysis_options.yaml +++ /dev/null @@ -1,31 +0,0 @@ -include: package:lints/recommended.yaml - -analyzer: - errors: - # There are currently 175 violations. - always_declare_return_types: ignore - # There are currently 60 violations. - annotate_overrides: ignore - # A number of class names mix UpperCamelCase with underscores. - camel_case_types: ignore - # This package freely and frequently imports implementation from analyzer. - implementation_imports: ignore - # Our test methods are named with snake_case. - non_constant_identifier_names: ignore - # There are currently 200 violations. - omit_local_variable_types: ignore - # There are currently 20 violations. - unawaited_futures: ignore - todo: ignore - - language: - strict-casts: true - -linter: - rules: - - enable_null_safety - - library_annotations - - unawaited_futures - - unnecessary_library_directive - - unnecessary_parenthesis - - unreachable_from_main diff --git a/pkg/nnbd_migration/bin/migrate.dart b/pkg/nnbd_migration/bin/migrate.dart deleted file mode 100644 index aac79667144f..000000000000 --- a/pkg/nnbd_migration/bin/migrate.dart +++ /dev/null @@ -1,23 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'dart:io'; - -import 'package:args/src/arg_results.dart'; -import 'package:nnbd_migration/migration_cli.dart'; - -void main(List args) async { - var cli = MigrationCli(binaryName: 'nnbd_migration'); - late ArgResults argResults; - try { - try { - argResults = MigrationCli.createParser().parse(args); - } on FormatException catch (e) { - cli.handleArgParsingException(e); - } - await cli.decodeCommandLineArgs(argResults)?.run(); - } on MigrationExit catch (migrationExit) { - exitCode = migrationExit.exitCode; - } -} diff --git a/pkg/nnbd_migration/lib/fix_reason_target.dart b/pkg/nnbd_migration/lib/fix_reason_target.dart deleted file mode 100644 index 1588b0530e6b..000000000000 --- a/pkg/nnbd_migration/lib/fix_reason_target.dart +++ /dev/null @@ -1,171 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -/// Data structure representing a part of a type. When a fix has multiple -/// reasons (due to a complex type having different nullabilities at different -/// locations), this data structure allows us to tell which part of the type -/// is associated with each reason. -abstract class FixReasonTarget { - /// Fix reason target representing the full type, rather than a part of it. - static const FixReasonTarget root = _FixReasonTarget_Root(); - - const FixReasonTarget._(); - - /// Gets a fix reason target representing the type's return type. - FixReasonTarget get returnType => _FixReasonTarget_ReturnType(this); - - /// Returns a description of the fix reason target that's suitable for - /// appending to a description of a nullability trace. - /// - /// For example, `root.returnType.suffix` returns ` for return type`. This - /// can be attached to a string like `nullability reason` to form - /// `nullability reason for return type`. - String get suffix => _describe('for'); - - /// Gets a fix reason target representing the type's yielded type. This - /// represents the type argument of `Future` or `FutureOr`, or in the case - /// where `await` is applied to a non-future type, the type itself. - FixReasonTarget get yieldedType => _FixReasonTarget_YieldedType(this); - - /// Gets a fix reason target representing one of the type's named parameters. - FixReasonTarget namedParameter(String name) => - _FixReasonTarget_NamedParameter(this, name); - - /// Gets a fix reason target representing one of the type's positional - /// parameters. - FixReasonTarget positionalParameter(int i) => - _FixReasonTarget_PositionalParameter(this, i); - - /// Gets a fix reason target representing one of the type's type arguments. - FixReasonTarget typeArgument(int i) => _FixReasonTarget_TypeArgument(this, i); - - String _describe(String preposition); -} - -/// Fix reason target representing a named parameter of a function type. -class _FixReasonTarget_NamedParameter extends _FixReasonTarget_Part { - final String name; - - _FixReasonTarget_NamedParameter(super.inner, this.name); - - @override - int get hashCode => Object.hash(2, inner, name); - - @override - bool operator ==(Object other) => - other is _FixReasonTarget_NamedParameter && - inner == other.inner && - name == other.name; - - @override - String _describe(String preposition) => - ' $preposition parameter $name${inner._describe('of')}'; -} - -/// Fix reason target representing a type that forms part of a larger type (e.g. -/// the `int` part of `List`). -abstract class _FixReasonTarget_Part extends FixReasonTarget { - final FixReasonTarget inner; - - _FixReasonTarget_Part(this.inner) : super._(); -} - -/// Fix reason target representing a positional parameter of a function type. -class _FixReasonTarget_PositionalParameter extends _FixReasonTarget_Part { - final int index; - - _FixReasonTarget_PositionalParameter(super.inner, this.index); - - @override - int get hashCode => Object.hash(1, inner, index); - - @override - bool operator ==(Object other) => - other is _FixReasonTarget_PositionalParameter && - inner == other.inner && - index == other.index; - - @override - String _describe(String preposition) => - ' $preposition parameter $index${inner._describe('of')}'; -} - -/// Fix reason target representing the return type of a function type. -class _FixReasonTarget_ReturnType extends _FixReasonTarget_Part { - _FixReasonTarget_ReturnType(super.inner); - - @override - int get hashCode => Object.hash(3, inner); - - @override - bool operator ==(Object other) => - other is _FixReasonTarget_ReturnType && inner == other.inner; - - @override - String _describe(String preposition) => - ' $preposition return type${inner._describe('of')}'; -} - -/// Fix reason target representing the root of the type in question. -class _FixReasonTarget_Root extends FixReasonTarget { - const _FixReasonTarget_Root() : super._(); - - @override - int get hashCode => 0; - - @override - bool operator ==(Object other) => other is _FixReasonTarget_Root; - - @override - String _describe(String preposition) => ''; -} - -/// Fix reason target representing a type argument of an interface type. -class _FixReasonTarget_TypeArgument extends _FixReasonTarget_Part { - final int index; - - _FixReasonTarget_TypeArgument(super.inner, this.index); - - @override - int get hashCode => Object.hash(5, inner, index); - - @override - bool operator ==(Object other) => - other is _FixReasonTarget_TypeArgument && - inner == other.inner && - index == other.index; - - @override - String _describe(String preposition) => - ' $preposition type argument $index${inner._describe('of')}'; -} - -/// Fix reason target representing the type argument of `Future` or `FutureOr`, -/// or in the case where `await` is applied to a non-future type, the type -/// itself. -/// -/// This allows the migration tool to describe a type correspondence that exists -/// in a subtype check involving `FutureOr`, for example if the user tries to -/// assign `List` to `FutureOr>`, then the migration tool -/// determines that it needs to change `*` into `?`. To make this determination -/// it has to form a correspondence between the type argument of the source type -/// and the type argument of the type argument of the destination type. To -/// explain to the user which part of the two types is involved in the -/// correspondence, we need an ambiguous way of referring to either "type -/// argument of type argument of" or simply "type argument". The solution is to -/// describe the fix reason target as "type argument of yielded type". -class _FixReasonTarget_YieldedType extends _FixReasonTarget_Part { - _FixReasonTarget_YieldedType(super.inner); - - @override - int get hashCode => Object.hash(4, inner); - - @override - bool operator ==(Object other) => - other is _FixReasonTarget_YieldedType && inner == other.inner; - - @override - String _describe(String preposition) => - ' $preposition yielded type${inner._describe('from')}'; -} diff --git a/pkg/nnbd_migration/lib/instrumentation.dart b/pkg/nnbd_migration/lib/instrumentation.dart deleted file mode 100644 index a8a8f27bc78e..000000000000 --- a/pkg/nnbd_migration/lib/instrumentation.dart +++ /dev/null @@ -1,516 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/dart/element/type.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:nnbd_migration/src/edit_plan.dart'; -import 'package:nnbd_migration/src/hint_action.dart'; - -/// Data structure used by the nullability migration engine to refer to a -/// specific location in source code. -class CodeReference { - final String path; - - final int line; - - final int column; - - final int offset; - - /// Name of the enclosing function, or `null` if not known. - String? function; - - CodeReference(this.path, this.offset, this.line, this.column, this.function); - - /// Creates a [CodeReference] pointing to the given [node]. - factory CodeReference.fromAstNode(AstNode node) { - var compilationUnit = node.thisOrAncestorOfType()!; - var source = compilationUnit.declaredElement!.source; - var location = compilationUnit.lineInfo.getLocation(node.offset); - return CodeReference(source.fullName, node.offset, location.lineNumber, - location.columnNumber, _computeEnclosingName(node)); - } - - factory CodeReference.fromElement(Element element) { - var unitElement = element.thisOrAncestorOfType(); - if (unitElement == null) { - var enclosingElement = element.enclosingElement; - if (enclosingElement is LibraryElement) { - unitElement = enclosingElement.definingCompilationUnit; - } else { - throw StateError('Unexpected element: $element'); - } - } - - var path = unitElement.source.fullName; - var offset = element.nameOffset; - - var location = unitElement.lineInfo.getLocation(offset); - return CodeReference(path, offset, location.lineNumber, - location.columnNumber, _computeElementFullName(element)); - } - - /// Gets a short description of this code reference (using the last component - /// of the path rather than the full path) - String get shortName => '$shortPath:$line:$column'; - - /// Gets the last component of the path part of this code reference. - String get shortPath { - var pathAsUri = Uri.file(path); - return pathAsUri.pathSegments.last; - } - - @override - String toString() { - var pathAsUri = Uri.file(path); - return '${function ?? 'unknown'} ($pathAsUri:$line:$column)'; - } - - static String? _computeElementFullName(Element? element) { - List parts = []; - while (element != null) { - var elementName = _computeElementName(element); - if (elementName != null) { - parts.add(elementName); - } - element = element.enclosingElement; - } - if (parts.isEmpty) return null; - return parts.reversed.join('.'); - } - - static String? _computeElementName(Element element) { - if (element is CompilationUnitElement || element is LibraryElement) { - return null; - } - return element.name; - } - - static String? _computeEnclosingName(AstNode? node) { - List parts = []; - while (node != null) { - var nodeName = _computeNodeDeclarationName(node); - if (nodeName != null) { - parts.add(nodeName); - } else if (parts.isEmpty && node is VariableDeclarationList) { - parts.add(node.variables.first.declaredElement!.name); - } - node = node.parent; - } - if (parts.isEmpty) return null; - return parts.reversed.join('.'); - } - - static String? _computeNodeDeclarationName(AstNode node) { - if (node is ExtensionDeclaration) { - return node.declaredElement?.name ?? ''; - } else if (node is Declaration) { - var name = node.declaredElement?.name; - return name == '' ? '' : name; - } else { - return null; - } - } -} - -/// Information exposed to the migration client about the set of nullability -/// nodes decorating a type in the program being migrated. -abstract class DecoratedTypeInfo { - /// Information about the graph node associated with the decision of whether - /// or not to make this type into a nullable type. - NullabilityNodeInfo? get node; - - /// If [type] is a function type, information about the set of nullability - /// nodes decorating the type's return type. - DecoratedTypeInfo? get returnType; - - /// The original (pre-migration) type that is being migrated. - DartType? get type; - - /// If [type] is a function type, looks up information about the set of - /// nullability nodes decorating one of the type's named parameter types. - DecoratedTypeInfo? namedParameter(String name); - - /// If [type] is a function type, looks up information about the set of - /// nullability nodes decorating one of the type's positional parameter types. - /// (This could be an optional or a required positional parameter). - DecoratedTypeInfo? positionalParameter(int i); - - /// If [type] is an interface type, looks up information about the set of - /// nullability nodes decorating one of the type's type arguments. - DecoratedTypeInfo? typeArgument(int i); -} - -/// Information about a propagation step that occurred during downstream -/// propagation. -abstract class DownstreamPropagationStepInfo implements PropagationStepInfo { - DownstreamPropagationStepInfo? get principalCause; - - /// The node whose nullability was changed. - /// - /// Any propagation step that took effect should have a non-null value here. - /// Propagation steps that are pending but have not taken effect yet, or that - /// never had an effect (e.g. because an edge was not triggered) will have a - /// `null` value for this field. - NullabilityNodeInfo? get targetNode; -} - -/// Information exposed to the migration client about an edge in the nullability -/// graph. -/// -/// A graph edge represents a dependency relationship between two types being -/// migrated, suggesting that if one type (the source) is made nullable, it may -/// be desirable to make the other type (the destination) nullable as well. -abstract class EdgeInfo implements FixReasonInfo { - /// User-friendly description of the edge, or `null` if not known. - String get description; - - /// Information about the graph node that this edge "points to". - NullabilityNodeInfo get destinationNode; - - /// The set of "guard nodes" for this edge. Guard nodes are graph nodes whose - /// nullability determines whether it is important to satisfy a graph edge. - /// If at least one of an edge's guards is non-nullable, then it is not - /// important to satisfy the graph edge. (Typically this is because the code - /// that led to the graph edge being created is only reachable if the guards - /// are all nullable). - Iterable get guards; - - /// A boolean indicating whether the graph edge is a "hard" edge. Hard edges - /// are associated with unconditional control flow, and thus allow information - /// about non-nullability to be propagated "upstream" through the nullability - /// graph. - bool get isHard; - - /// A boolean indicating whether the graph edge is "satisfied". At its heart, - /// the nullability propagation algorithm is an effort to satisfy graph edges - /// in a way that corresponds to the user's intent. A graph edge is - /// considered satisfied if any of the following is true: - /// - Its [sourceNode] is non-nullable. - /// - One of its [guards] is non-nullable. - /// - Its [destinationNode] is nullable. - bool get isSatisfied; - - /// Indicates whether all the upstream nodes of this edge are nullable (and - /// thus downstream nullability propagation should try to make the destination - /// node nullable, if possible). - bool get isTriggered; - - /// A boolean indicating whether the graph edge is a "union" edge. Union - /// edges are edges for which the nullability propagation algorithm tries to - /// ensure that both the [sourceNode] and the [destinationNode] have the - /// same nullability. Typically these are associated with situations where - /// Dart language semantics require two types to be the same type (e.g. a type - /// formal bound on a generic function type in a base class, and the - /// corresponding type formal bound on a generic function type in an - /// overriding class). - /// - /// The [isHard] property is always true for union edges. - bool get isUnion; - - /// Indicates whether the downstream node of this edge is non-nullable and the - /// edge is hard (and thus upstream nullability propagation should try to make - /// the source node non-nullable, if possible). - bool get isUpstreamTriggered; - - /// Information about the graph node that this edge "points away from". - NullabilityNodeInfo? get sourceNode; -} - -/// Information exposed to the migration client about the location in source -/// code that led an edge to be introduced into the nullability graph. -abstract class EdgeOriginInfo { - /// If the proximate cause of the edge being introduced into the graph - /// corresponds to the type of an element in an already migrated-library, the - /// corresponding element; otherwise `null`. - /// - /// Note that either [node] or [element] will always be non-null. - Element? get element; - - /// The kind of origin represented by this info. - EdgeOriginKind? get kind; - - /// If the proximate cause of the edge being introduced into the graph - /// corresponds to an AST node in a source file that is being migrated, the - /// corresponding AST node; otherwise `null`. - /// - /// Note that either [node] or [element] will always be non-null. - AstNode? get node; - - /// If [node] is non-null, the source file that it appears in. Otherwise - /// `null`. - Source? get source; -} - -/// An enumeration of the various kinds of edge origins created by the migration -/// engine. -enum EdgeOriginKind { - alreadyMigratedType, - alwaysNullableType, - angularAnnotation, - angularConstructorArgument, - argumentErrorCheckNotNull, - assignmentFromAngularInjectorGet, - builtValueNullableAnnotation, - callTearOff, - compoundAssignment, - // See [DummyOrigin]. - dummy, - dynamicAssignment, - enumValue, - expressionChecks, - externalDynamic, - fieldFormalParameter, - fieldNotInitialized, - forEachVariable, - getterSetterCorrespondence, - greatestLowerBound, - ifNull, - implicitMixinSuperCall, - implicitNullInitializer, - implicitNullReturn, - implicitThis, - inferredTypeParameterInstantiation, - instanceCreation, - instantiateToBounds, - isCheckComponentType, - isCheckMainType, - iteratorMethodReturn, - listLengthConstructor, - literal, - namedParameterNotSupplied, - nonNullableBoolType, - nonNullableObjectSuperclass, - nonNullableUsage, - nonNullAssertion, - nullabilityComment, - nullAwareAccess, - optionalFormalParameter, - parameterInheritance, - publicMethodArgument, - quiverCheckNotNull, - returnTypeInheritance, - stackTraceTypeOrigin, - thisOrSuper, - throw_, - typedefReference, - typeParameterInstantiation, - uninitializedRead, -} - -/// Interface used by the migration engine to expose information to its client -/// about a reason for a modification to the source file. -abstract class FixReasonInfo {} - -/// Abstract interface for assigning ids numbers to nodes, and performing -/// lookups afterwards. -abstract class NodeMapper extends NodeToIdMapper { - /// Gets the node corresponding to the given [id]. - NullabilityNodeInfo? nodeForId(int? id); -} - -/// Abstract interface for assigning ids numbers to nodes. -abstract class NodeToIdMapper { - /// Gets the id corresponding to the given [node]. - int idForNode(NullabilityNodeInfo node); -} - -/// Interface used by the migration engine to expose information to its client -/// about the decisions made during migration, and how those decisions relate to -/// the input source code. -abstract class NullabilityMigrationInstrumentation { - /// Called whenever changes are decided upon for a given [source] file. - /// - /// The format of the changes is a map from source file offset to a list of - /// changes to be applied at that offset. - void changes(Source source, Map> changes); - - /// Called whenever an explicit [typeAnnotation] is found in the source code, - /// to report the nullability [node] that was associated with this type. If - /// the migration engine determines that the [node] should be nullable, a `?` - /// will be inserted after the type annotation. - void explicitTypeNullability( - Source? source, TypeAnnotation typeAnnotation, NullabilityNodeInfo? node); - - /// Called whenever reference is made to an [element] outside of the code - /// being migrated, to report the nullability nodes associated with the type - /// of the element. - void externalDecoratedType(Element element, DecoratedTypeInfo decoratedType); - - /// Called whenever reference is made to an [typeParameter] outside of the - /// code being migrated, to report the nullability nodes associated with the - /// bound of the type parameter. - void externalDecoratedTypeParameterBound( - TypeParameterElement typeParameter, DecoratedTypeInfo decoratedType); - - /// Called when the migration process is finished. - void finished(); - - /// Called whenever the migration engine creates a graph edge between - /// nullability nodes, to report information about the edge that was created, - /// and why it was created. - void graphEdge(EdgeInfo edge, EdgeOriginInfo originInfo); - - /// Called when the migration engine starts up, to report information about - /// the immutable migration nodes [never] and [always] that are used as the - /// starting point for nullability propagation. - void immutableNodes(NullabilityNodeInfo never, NullabilityNodeInfo always); - - /// Called whenever the migration engine encounters an implicit return type - /// associated with an AST node, to report the nullability nodes associated - /// with the implicit return type of the AST node. - /// - /// [node] is the AST node having an implicit return type; it may be an - /// executable declaration, function-typed formal parameter declaration, - /// function type alias declaration, GenericFunctionType, or a function - /// expression. - void implicitReturnType( - Source? source, AstNode node, DecoratedTypeInfo? decoratedReturnType); - - /// Called whenever the migration engine encounters an implicit type - /// associated with an AST node, to report the nullability nodes associated - /// with the implicit type of the AST node. - /// - /// [node] is the AST node having an implicit type; it may be a formal - /// parameter, a declared identifier, or a variable in a variable declaration - /// list. - void implicitType( - Source? source, AstNode? node, DecoratedTypeInfo decoratedType); - - /// Called whenever the migration engine encounters an AST node with implicit - /// type arguments, to report the nullability nodes associated with the - /// implicit type arguments of the AST node. - /// - /// [node] is the AST node having implicit type arguments; it may be a - /// constructor redirection, function expression invocation, method - /// invocation, instance creation expression, list/map/set literal, or type - /// annotation. - void implicitTypeArguments( - Source? source, AstNode node, Iterable types); - - /// Clear any data from the propagation step in preparation for that step - /// being re-run. - void prepareForUpdate(); -} - -/// Information exposed to the migration client about a single node in the -/// nullability graph. -abstract class NullabilityNodeInfo implements FixReasonInfo { - /// List of compound nodes wrapping this node. - final List outerCompoundNodes = []; - - /// Source code location corresponding to this nullability node, or `null` if - /// not known. - CodeReference? get codeReference; - - /// Some nodes get nullability from downstream, so the downstream edges are - /// available to query as well. - Iterable get downstreamEdges; - - /// The hint actions users can perform on this node, indexed by the type of - /// hint. - /// - /// Each edit is represented as a [Map>] as is typical - /// of [AtomicEdit]s since they do not have an offset. See extensions - /// [AtomicEditMap] and [AtomicEditList] for usage. - Map>> get hintActions; - - /// After migration is complete, this getter can be used to query whether - /// the type associated with this node was determined to be "exact nullable." - bool get isExactNullable; - - /// Indicates whether the node is immutable. The only immutable nodes in the - /// nullability graph are the nodes `never` and `always` that are used as the - /// starting points for nullability propagation. - bool get isImmutable; - - /// After migration is complete, this getter can be used to query whether - /// the type associated with this node was determined to be nullable. - bool get isNullable; - - /// The edges that caused this node to have the nullability that it has. - Iterable get upstreamEdges; - - /// If [isNullable] is false, the propagation step that caused this node to - /// become non-nullable (if any). - UpstreamPropagationStepInfo? get whyNotNullable; - - /// If [isNullable] is true, the propagation step that caused this node to - /// become nullable. - DownstreamPropagationStepInfo? get whyNullable; -} - -abstract class PropagationStepInfo { - CodeReference? get codeReference; - - /// The nullability edge associated with this propagation step, if any. - /// Otherwise `null`. - EdgeInfo? get edge; -} - -/// Reason information for a simple fix that isn't associated with any edges or -/// nodes. -abstract class SimpleFixReasonInfo implements FixReasonInfo { - /// Code location of the fix. - CodeReference get codeReference; - - /// Description of the fix. - String get description; -} - -/// A simple implementation of [NodeMapper] that assigns ids to nodes as they -/// are requested, backed by a map. -/// -/// Be careful not to leak references to nodes by holding on to this beyond the -/// lifetime of the nodes it maps. -class SimpleNodeMapper extends NodeMapper { - final _nodeToId = {}; - final _idToNode = {}; - - @override - int idForNode(NullabilityNodeInfo node) { - final id = _nodeToId.putIfAbsent(node, () => _nodeToId.length); - _idToNode.putIfAbsent(id, () => node); - return id; - } - - @override - NullabilityNodeInfo? nodeForId(int? id) => _idToNode[id!]; -} - -/// Information exposed to the migration client about a node in the nullability -/// graph resulting from a type substitution. -abstract class SubstitutionNodeInfo extends NullabilityNodeInfo { - /// Nullability node representing the inner type of the substitution. - /// - /// For example, if this NullabilityNode arose from substituting `int*` for - /// `T` in the type `T*`, [innerNode] is the nullability corresponding to the - /// `*` in `int*`. - NullabilityNodeInfo get innerNode; - - /// Nullability node representing the outer type of the substitution. - /// - /// For example, if this NullabilityNode arose from substituting `int*` for - /// `T` in the type `T*`, [innerNode] is the nullability corresponding to the - /// `*` in `T*`. - NullabilityNodeInfo get outerNode; -} - -/// Information about a propagation step that occurred during upstream -/// propagation. -abstract class UpstreamPropagationStepInfo implements PropagationStepInfo { - bool get isStartingPoint; - - /// The node whose nullability was changed. - /// - /// Any propagation step that took effect should have a non-null value here. - /// Propagation steps that are pending but have not taken effect yet, or that - /// never had an effect (e.g. because an edge was not triggered) will have a - /// `null` value for this field. - NullabilityNodeInfo get node; - - UpstreamPropagationStepInfo? get principalCause; -} diff --git a/pkg/nnbd_migration/lib/migration_cli.dart b/pkg/nnbd_migration/lib/migration_cli.dart deleted file mode 100644 index 650c27f719ce..000000000000 --- a/pkg/nnbd_migration/lib/migration_cli.dart +++ /dev/null @@ -1,1149 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'dart:async'; -import 'dart:io' hide File; - -import 'package:analyzer/dart/analysis/features.dart'; -import 'package:analyzer/dart/analysis/results.dart'; -import 'package:analyzer/diagnostic/diagnostic.dart'; -import 'package:analyzer/error/error.dart'; -import 'package:analyzer/file_system/file_system.dart' - show File, ResourceProvider; -import 'package:analyzer/file_system/physical_file_system.dart'; -import 'package:analyzer/source/line_info.dart'; -import 'package:analyzer/src/dart/analysis/analysis_context_collection.dart'; -import 'package:analyzer/src/dart/analysis/driver_based_analysis_context.dart'; -import 'package:analyzer/src/error/codes.dart'; -import 'package:analyzer/src/util/sdk.dart'; -import 'package:analyzer_plugin/protocol/protocol_common.dart' - hide AnalysisError; -import 'package:args/args.dart'; -import 'package:cli_util/cli_logging.dart'; -import 'package:meta/meta.dart'; -import 'package:nnbd_migration/src/edit_plan.dart'; -import 'package:nnbd_migration/src/exceptions.dart'; -import 'package:nnbd_migration/src/front_end/dartfix_listener.dart'; -import 'package:nnbd_migration/src/front_end/driver_provider_impl.dart'; -import 'package:nnbd_migration/src/front_end/migration_state.dart'; -import 'package:nnbd_migration/src/front_end/non_nullable_fix.dart'; -import 'package:nnbd_migration/src/messages.dart'; -import 'package:nnbd_migration/src/utilities/progress_bar.dart'; -import 'package:nnbd_migration/src/utilities/source_edit_diff_formatter.dart'; -import 'package:path/path.dart' show Context; - -String _pluralize(int count, String single, {String? multiple}) { - return count == 1 ? single : (multiple ?? '${single}s'); -} - -String _removePeriod(String value) { - return value.endsWith('.') ? value.substring(0, value.length - 1) : value; -} - -/// The result of a round of static analysis; primarily a list of -/// [AnalysisError]s. -class AnalysisResult { - final List errors; - final Map lineInfo; - final Context pathContext; - final String rootDirectory; - final bool allSourcesAlreadyMigrated; - - AnalysisResult(this.errors, this.lineInfo, this.pathContext, - this.rootDirectory, this.allSourcesAlreadyMigrated) { - errors.sort((AnalysisError one, AnalysisError two) { - if (one.source != two.source) { - return one.source.fullName.compareTo(two.source.fullName); - } - return one.offset - two.offset; - }); - } - - bool get hasErrors => errors.isNotEmpty; - - /// Whether the errors include any which may be the result of not yet having - /// run "pub get". - bool get hasImportErrors => errors.any( - (error) => error.errorCode == CompileTimeErrorCode.URI_DOES_NOT_EXIST); - - /// Converts the list of errors into JSON, for displaying in the web preview. - List> toJson() { - var result = >[]; - // severity • Message ... at foo/bar.dart:6:1 • (error_code) - for (var error in errors) { - var lineInfoForThisFile = lineInfo[error.source.fullName]!; - var location = lineInfoForThisFile.getLocation(error.offset); - var path = - pathContext.relative(error.source.fullName, from: rootDirectory); - result.add({ - 'severity': error.severity.name, - 'message': _removePeriod(error.message), - 'location': '$path:${location.lineNumber}:${location.columnNumber}', - 'code': error.errorCode.name.toLowerCase(), - }); - } - return result; - } -} - -/// Data structure recording command-line options for the migration tool that -/// have been passed in by the client. -class CommandLineOptions { - static const applyChangesFlag = 'apply-changes'; - static const helpFlag = 'help'; - static const ignoreErrorsFlag = 'ignore-errors'; - static const ignoreExceptionsFlag = 'ignore-exceptions'; - static const previewHostnameOption = 'preview-hostname'; - static const previewPortOption = 'preview-port'; - static const sdkPathOption = 'sdk-path'; - static const skipImportCheckFlag = 'skip-import-check'; - static const summaryOption = 'summary'; - static const verboseFlag = 'verbose'; - static const webPreviewFlag = 'web-preview'; - - final bool applyChanges; - - final String directory; - - final bool? ignoreErrors; - - final bool? ignoreExceptions; - - final String? previewHostname; - - final int? previewPort; - - final String sdkPath; - - final bool? skipImportCheck; - - final String? summary; - - final bool? webPreview; - - CommandLineOptions( - {required this.applyChanges, - required this.directory, - required this.ignoreErrors, - required this.ignoreExceptions, - required this.previewHostname, - required this.previewPort, - required this.sdkPath, - required this.skipImportCheck, - required this.summary, - required this.webPreview}); -} - -/// Command-line API for the migration tool, with additional parameters exposed -/// for testing. -/// -/// Recommended usage: create an instance of this object and call -/// [decodeCommandLineArgs]. If it returns non-null, call -/// [MigrationCliRunner.run] on the result. If either method throws a -/// [MigrationExit], exit with the error code contained therein. -class MigrationCli { - /// A list of all the command-line options supported by the tool. - /// - /// This may be used by clients that wish to run migration but provide their - /// own command-line interface. - static final List options = [ - MigrationCliOption( - CommandLineOptions.verboseFlag, - (parser, hide) => parser.addFlag( - CommandLineOptions.verboseFlag, - abbr: 'v', - defaultsTo: false, - help: 'Show additional command output.', - negatable: false, - )), - MigrationCliOption( - CommandLineOptions.applyChangesFlag, - (parser, hide) => parser.addFlag(CommandLineOptions.applyChangesFlag, - defaultsTo: false, - negatable: false, - help: - 'Apply the proposed null safety changes to the files on disk.')), - MigrationCliOption( - CommandLineOptions.ignoreErrorsFlag, - (parser, hide) => parser.addFlag( - CommandLineOptions.ignoreErrorsFlag, - defaultsTo: false, - negatable: false, - help: - 'Attempt to perform null safety analysis even if the project has ' - 'analysis errors.', - )), - MigrationCliOption( - CommandLineOptions.skipImportCheckFlag, - (parser, hide) => parser.addFlag( - CommandLineOptions.skipImportCheckFlag, - defaultsTo: false, - negatable: false, - help: 'Go ahead with migration even if some imported files have ' - 'not yet been migrated.', - )), - MigrationCliOption.separator('Web interface options:'), - MigrationCliOption( - CommandLineOptions.webPreviewFlag, - (parser, hide) => parser.addFlag( - CommandLineOptions.webPreviewFlag, - defaultsTo: true, - negatable: true, - help: - 'Show an interactive preview of the proposed null safety changes ' - 'in a browser window. Use --no-web-preview to print proposed changes ' - 'to the console.', - )), - MigrationCliOption( - CommandLineOptions.previewHostnameOption, - (parser, hide) => parser.addOption( - CommandLineOptions.previewHostnameOption, - defaultsTo: 'localhost', - valueHelp: 'host', - help: 'Run the preview server on the specified hostname. If not ' - 'specified, "localhost" is used. Use "any" to specify IPv6.any or ' - 'IPv4.any.', - )), - MigrationCliOption( - CommandLineOptions.previewPortOption, - (parser, hide) => parser.addOption( - CommandLineOptions.previewPortOption, - valueHelp: 'port', - help: - 'Run the preview server on the specified port. If not specified, ' - 'dynamically allocate a port.', - )), - MigrationCliOption.separator('Additional options:'), - MigrationCliOption( - CommandLineOptions.summaryOption, - (parser, hide) => parser.addOption( - CommandLineOptions.summaryOption, - help: 'Output a machine-readable summary of migration changes.', - valueHelp: 'path', - )), - // hidden options - MigrationCliOption( - CommandLineOptions.ignoreExceptionsFlag, - (parser, hide) => parser.addFlag( - CommandLineOptions.ignoreExceptionsFlag, - defaultsTo: false, - negatable: false, - help: - 'Attempt to perform null safety analysis even if exceptions occur.', - hide: hide, - )), - MigrationCliOption( - CommandLineOptions.sdkPathOption, - (parser, hide) => parser.addOption( - CommandLineOptions.sdkPathOption, - valueHelp: 'sdk-path', - help: 'The path to the Dart SDK.', - hide: hide, - )), - ]; - - static const String migrationGuideLink = - 'See https://dart.dev/go/null-safety-migration for a migration guide.'; - - /// The name of the executable, for reporting in help messages. - final String binaryName; - - /// The SDK path that should be used if none is provided by the user. Used in - /// testing to install a mock SDK. - final String? defaultSdkPathOverride; - - /// Factory to create an appropriate Logger instance to give feedback to the - /// user. Used in testing to allow user feedback messages to be tested. - final Logger Function(bool isVerbose) loggerFactory; - - /// Resource provider that should be used to access the filesystem. Used in - /// testing to redirect to an in-memory filesystem. - final ResourceProvider resourceProvider; - - /// Logger instance we use to give feedback to the user. - final Logger logger; - - /// The environment variables, tracked to help users debug if SDK_PATH was - /// specified and that resulted in any [ExperimentStatusException]s. - final Map _environmentVariables; - - MigrationCli({ - required this.binaryName, - @visibleForTesting this.loggerFactory = _defaultLoggerFactory, - @visibleForTesting this.defaultSdkPathOverride, - @visibleForTesting ResourceProvider? resourceProvider, - @visibleForTesting Map? environmentVariables, - }) : logger = loggerFactory(false), - resourceProvider = - resourceProvider ?? PhysicalResourceProvider.INSTANCE, - _environmentVariables = environmentVariables ?? Platform.environment; - - Context get pathContext => resourceProvider.pathContext; - - /// Parses and validates command-line arguments, and creates a - /// [MigrationCliRunner] that is prepared to perform migration. - /// - /// If the user asked for help, it is printed using the logger configured in - /// the constructor, and `null` is returned. - /// - /// If the user supplied a bad option, a message is printed using the logger - /// configured in the constructor, and [MigrationExit] is thrown. - MigrationCliRunner? decodeCommandLineArgs(ArgResults argResults, - {bool? isVerbose}) { - try { - isVerbose ??= argResults[CommandLineOptions.verboseFlag] as bool; - if (argResults[CommandLineOptions.helpFlag] as bool) { - _showUsage(isVerbose); - return null; - } - var rest = argResults.rest; - String migratePath; - if (rest.isEmpty) { - migratePath = pathContext.current; - } else if (rest.length > 1) { - throw _BadArgException('No more than one path may be specified.'); - } else { - migratePath = pathContext - .normalize(pathContext.join(pathContext.current, rest[0])); - } - var migrateResource = resourceProvider.getResource(migratePath); - if (migrateResource is File) { - if (migrateResource.exists) { - throw _BadArgException('$migratePath is a file.'); - } else { - throw _BadArgException('$migratePath does not exist.'); - } - } - var applyChanges = - argResults[CommandLineOptions.applyChangesFlag] as bool; - var previewPortRaw = - argResults[CommandLineOptions.previewPortOption] as String?; - int? previewPort; - try { - previewPort = previewPortRaw == null ? null : int.parse(previewPortRaw); - } on FormatException catch (_) { - throw _BadArgException( - 'Invalid value for --${CommandLineOptions.previewPortOption}'); - } - bool webPreview; - if (argResults.wasParsed(CommandLineOptions.webPreviewFlag)) { - webPreview = argResults[CommandLineOptions.webPreviewFlag] as bool; - } else { - // If the `webPreviewFlag` wasn't explicitly passed, then the value of - // this option is based on the value of the [applyChanges] option. - webPreview = !applyChanges; - } - if (applyChanges && webPreview) { - throw _BadArgException('--apply-changes requires --no-web-preview'); - } - var options = CommandLineOptions( - applyChanges: applyChanges, - directory: migratePath, - ignoreErrors: - argResults[CommandLineOptions.ignoreErrorsFlag] as bool?, - ignoreExceptions: - argResults[CommandLineOptions.ignoreExceptionsFlag] as bool?, - previewHostname: - argResults[CommandLineOptions.previewHostnameOption] as String?, - previewPort: previewPort, - sdkPath: argResults[CommandLineOptions.sdkPathOption] as String? ?? - defaultSdkPathOverride ?? - getSdkPath(), - skipImportCheck: - argResults[CommandLineOptions.skipImportCheckFlag] as bool?, - summary: argResults[CommandLineOptions.summaryOption] as String?, - webPreview: webPreview); - return MigrationCliRunner(this, options, - logger: isVerbose ? loggerFactory(true) : null); - } on Object catch (exception) { - handleArgParsingException(exception); - } - } - - Never handleArgParsingException(Object exception) { - String message; - if (exception is FormatException) { - message = exception.message; - } else if (exception is _BadArgException) { - message = exception.message; - } else { - message = - 'Exception occurred while parsing command-line options: $exception'; - } - logger.stderr(message); - _showUsage(false); - throw MigrationExit(1); - } - - void _showUsage(bool isVerbose) { - logger.stderr('Usage: $binaryName [options...] []'); - - logger.stderr(''); - logger.stderr(createParser(hide: !isVerbose).usage); - if (!isVerbose) { - logger.stderr(''); - logger - .stderr('Run "$binaryName -h -v" for verbose help output, including ' - 'less commonly used options.'); - } - } - - static ArgParser createParser({bool hide = true}) { - var parser = ArgParser(); - parser.addFlag(CommandLineOptions.helpFlag, - abbr: 'h', - help: - 'Display this help message. Add --verbose to show hidden options.', - defaultsTo: false, - negatable: false); - defineOptions(parser, hide); - return parser; - } - - static void defineOptions(ArgParser parser, bool hide) { - for (var option in options) { - option.addToParser(parser, hide); - } - } - - static Logger _defaultLoggerFactory(bool isVerbose) { - var ansi = Ansi(Ansi.terminalSupportsAnsi); - if (isVerbose) { - return Logger.verbose(ansi: ansi); - } else { - return Logger.standard(ansi: ansi); - } - } -} - -/// Data structure representing a single command-line option to the migration -/// tool, or a separator in the list of command-line options. -class MigrationCliOption { - /// The name of the option, without the leading `--`. - final String name; - - /// Callback function that can be used to add the option or separator to the - /// given [parser]. If [hide] is `true`, and the option is rarely used, it - /// is added as a hidden option. - final void Function(ArgParser parser, bool hide) addToParser; - - /// If `true`, this is a separator between command line options; if `false`, - /// it's an option. - final bool isSeparator; - - MigrationCliOption(this.name, this.addToParser) : isSeparator = false; - - MigrationCliOption.separator(this.name) - : addToParser = ((parser, hide) => parser.addSeparator(name)), - isSeparator = true; -} - -/// Internals of the command-line API for the migration tool, with additional -/// methods exposed for testing. -/// -/// This class may be used directly by clients that with to run migration but -/// provide their own command-line interface. -class MigrationCliRunner implements DartFixListenerClient { - final MigrationCli cli; - - /// Logger instance we use to give feedback to the user. - final Logger logger; - - /// The result of parsing command-line options. - final CommandLineOptions options; - - final Map lineInfo = {}; - - DartFixListener? _dartFixListener; - - _FixCodeProcessor? _fixCodeProcessor; - - AnalysisContextCollectionImpl? _contextCollection; - - bool _hasExceptions = false; - - bool _hasAnalysisErrors = false; - - /// Subscription of interrupt signals (control-C). - StreamSubscription? _sigIntSubscription; - - /// Completes when an interrupt signal (control-C) is received. - late Completer sigIntSignalled; - - MigrationCliRunner(this.cli, this.options, {Logger? logger}) - : logger = logger ?? cli.logger; - - @visibleForTesting - DriverBasedAnalysisContext get analysisContext { - // Handle the case of more than one analysis context being found (typically, - // the current directory and one or more sub-directories). - if (hasMultipleAnalysisContext) { - return contextCollection!.contextFor(options.directory); - } else { - return contextCollection!.contexts.single; - } - } - - Ansi get ansi => logger.ansi; - - AnalysisContextCollectionImpl? get contextCollection { - _contextCollection ??= AnalysisContextCollectionImpl( - includedPaths: [options.directory], - resourceProvider: resourceProvider, - sdkPath: pathContext.normalize(options.sdkPath)); - return _contextCollection; - } - - @visibleForTesting - bool get hasMultipleAnalysisContext { - return contextCollection!.contexts.length > 1; - } - - @visibleForTesting - bool get isPreviewServerRunning => - _fixCodeProcessor?.isPreviewServerRunning ?? false; - - Context get pathContext => resourceProvider.pathContext; - - ResourceProvider get resourceProvider => cli.resourceProvider; - - /// Called after changes have been applied on disk. Maybe overridden by a - /// derived class. - void applyHook() {} - - /// Computes the internet address that should be passed to `HttpServer.bind` - /// when starting the preview server. May be overridden in derived classes. - Object? computeBindAddress() { - var hostname = options.previewHostname; - if (hostname == 'localhost') { - return InternetAddress.loopbackIPv4; - } else if (hostname == 'any') { - return InternetAddress.anyIPv6; - } else { - return hostname; - } - } - - /// Computes the set of file paths that should be analyzed by the migration - /// engine. May be overridden by a derived class. - /// - /// All files to be migrated must be included in the returned set. It is - /// permissible for the set to contain additional files that could help the - /// migration tool build up a more complete nullability graph (for example - /// generated files, or usages of the code-to-be-migrated by one of its - /// clients). - /// - /// By default returns the set of all `.dart` files contained in the context. - Set computePathsToProcess(DriverBasedAnalysisContext context) => - context.contextRoot - .analyzedFiles() - .where((s) => - s.endsWith('.dart') && - // Any file may have been deleted since its initial analysis. - resourceProvider.getFile(s).exists) - .toSet(); - - NonNullableFix createNonNullableFix(DartFixListener listener, - ResourceProvider resourceProvider, Object? bindAddress, - {List included = const [], - int? preferredPort, - String? summaryPath, - required String sdkPath}) { - return NonNullableFix(listener, resourceProvider, bindAddress, logger, - (String? path) => shouldBeMigrated(path!), - included: included, - preferredPort: preferredPort, - summaryPath: summaryPath, - sdkPath: sdkPath); - } - - /// Subscribes to the interrupt signal (control-C). - @visibleForTesting - void listenForSignalInterrupt() { - var stream = ProcessSignal.sigint.watch(); - sigIntSignalled = Completer(); - _sigIntSubscription = stream.listen((_) { - if (!sigIntSignalled.isCompleted) { - sigIntSignalled.complete(); - } - }); - } - - @override - void onException(String detail) { - if (_hasExceptions) { - if (!options.ignoreExceptions!) { - // Our intention is to exit immediately when an exception occurred. We - // tried, but failed (probably due to permissive mode logic in the - // migration tool itself catching the MigrationExit exception). The - // stack has now been unwound further, so throw again. - throw MigrationExit(1); - } - // We're not exiting immediately when an exception occurs. We've already - // reported that an exception happened. So do nothing further. - return; - } - _hasExceptions = true; - if (options.ignoreExceptions!) { - logger.stdout(''' -Exception(s) occurred during migration. Attempting to perform -migration anyway due to the use of --${CommandLineOptions.ignoreExceptionsFlag}. - -To see exception details, re-run without --${CommandLineOptions.ignoreExceptionsFlag}. -'''); - } else { - if (_hasAnalysisErrors) { - logger.stderr(''' -Aborting migration due to an exception. This may be due to a bug in -the migration tool, or it may be due to errors in the source code -being migrated. If possible, try to fix errors in the source code and -re-try migrating. If that doesn't work, consider filing a bug report -at: -'''); - } else { - logger.stderr(''' -Aborting migration due to an exception. This most likely is due to a -bug in the migration tool. Please consider filing a bug report at: -'''); - } - logger.stderr('https://github.com/dart-lang/sdk/issues/new'); - var sdkVersion = Platform.version.split(' ')[0]; - logger.stderr(''' -Please include the SDK version ($sdkVersion) in your bug report. - -To attempt to perform migration anyway, you may re-run with ---${CommandLineOptions.ignoreExceptionsFlag}. - -Exception details: -'''); - logger.stderr(detail); - throw MigrationExit(1); - } - } - - @override - void onFatalError(String detail) { - logger.stderr(detail); - throw MigrationExit(1); - } - - @override - void onMessage(String detail) { - logger.stdout(detail); - } - - /// Runs the full migration process. - /// - /// If something goes wrong, a message is printed using the logger configured - /// in the constructor, and [MigrationExit] is thrown. - Future run() async { - logger.stdout('Migrating ${options.directory}'); - logger.stdout(''); - - logger.stdout(MigrationCli.migrationGuideLink); - logger.stdout(''); - - if (hasMultipleAnalysisContext) { - logger.stdout('Note: more than one project found; migrating the ' - 'top-level project.'); - logger.stdout(''); - } - - NonNullableFix nonNullableFix; - - logger.stdout(ansi.emphasized('Analyzing project...')); - _fixCodeProcessor = _FixCodeProcessor(analysisContext, this); - _dartFixListener = DartFixListener( - DriverProviderImpl(resourceProvider, analysisContext), this); - nonNullableFix = createNonNullableFix( - _dartFixListener!, resourceProvider, computeBindAddress(), - included: [options.directory], - preferredPort: options.previewPort, - summaryPath: options.summary, - sdkPath: options.sdkPath); - nonNullableFix.rerunFunction = _rerunFunction; - _fixCodeProcessor!.registerCodeTask(nonNullableFix); - - try { - var analysisResult = await _fixCodeProcessor!.runFirstPhase(); - - if (analysisResult.hasErrors) { - _logErrors(analysisResult); - if (!options.ignoreErrors!) { - throw MigrationExit(1); - } - } else if (analysisResult.allSourcesAlreadyMigrated) { - _logAlreadyMigrated(); - throw MigrationExit(0); - } else { - logger.stdout('No analysis issues found.'); - } - } on ExperimentStatusException catch (e) { - logger.stdout(e.toString()); - final sdkPathVar = cli._environmentVariables['SDK_PATH']; - if (sdkPathVar != null) { - logger.stdout('$sdkPathEnvironmentVariableSet: $sdkPathVar'); - } - throw MigrationExit(1); - } - - logger.stdout(''); - logger.stdout(ansi.emphasized('Generating migration suggestions...')); - var previewUrls = (await _fixCodeProcessor!.runLaterPhases()).previewUrls; - - if (options.applyChanges) { - logger.stdout(ansi.emphasized('Applying changes:')); - - var allEdits = _dartFixListener!.sourceChange.edits; - _applyMigrationSuggestions(allEdits); - - logger.stdout(''); - logger.stdout( - 'Applied ${allEdits.length} ${_pluralize(allEdits.length, 'edit')}.'); - - // Note: do not open the web preview if apply-changes is specified, as we - // currently cannot tell the web preview to disable the "apply migration" - // button. - return; - } - - if (options.webPreview!) { - assert(previewUrls!.length == 1, - 'Got unexpected extra preview URLs from server'); - - var url = previewUrls!.single; - // TODO(#41809): Open a browser automatically. - logger.stdout(''' -View the migration suggestions by visiting: - - ${ansi.emphasized(url)} - -Use this interactive web view to review, improve, or apply the results. -When finished with the preview, hit ctrl-c to terminate this process. - -If you make edits outside of the web view (in your IDE), use the 'Rerun from -sources' action. - -'''); - - listenForSignalInterrupt(); - await Future.any([ - sigIntSignalled.future, - nonNullableFix.serverIsShutdown.future, - ]); - // Either the interrupt signal was caught, or the server was shutdown. - // Either way, cancel the interrupt signal subscription, and shutdown the - // server. - _sigIntSubscription?.cancel(); - nonNullableFix.shutdownServer(); - } else { - logger.stdout(ansi.emphasized('Diff of changes:')); - - _displayChangeDiff(_dartFixListener!); - - logger.stdout(''); - logger.stdout('To apply these changes, re-run the tool with ' - '--${CommandLineOptions.applyChangesFlag}.'); - } - } - - /// Determines whether a migrated version of the file at [path] should be - /// output by the migration too. May be overridden by a derived class. - /// - /// This method should return `false` for files that are being considered by - /// the migration tool for information only (for example generated files, or - /// usages of the code-to-be-migrated by one of its clients). - /// - /// By default returns `true` if the file is contained within the context - /// root. This means that if a client overrides [computePathsToProcess] to - /// return additional paths that aren't inside the user's project, but doesn't - /// override this method, then those additional paths will be analyzed but not - /// migrated. - bool shouldBeMigrated(String path) { - return analysisContext.contextRoot.isAnalyzed(path); - } - - /// Perform the indicated source edits to the given source, returning the - /// resulting transformed text. - String _applyEdits(SourceFileEdit sourceFileEdit, String source) { - List edits = _sortEdits(sourceFileEdit); - return SourceEdit.applySequence(source, edits); - } - - void _applyMigrationSuggestions(List edits) { - // Apply the changes to disk. - for (SourceFileEdit sourceFileEdit in edits) { - String relPath = - pathContext.relative(sourceFileEdit.file, from: options.directory); - int count = sourceFileEdit.edits.length; - logger.stdout(' $relPath ($count ${_pluralize(count, 'change')})'); - - String? source; - var file = resourceProvider.getFile(sourceFileEdit.file); - try { - source = file.readAsStringSync(); - } catch (_) {} - - if (source == null) { - logger.stdout(' Unable to retrieve source for file.'); - } else { - source = _applyEdits(sourceFileEdit, source); - - try { - file.writeAsStringSync(source); - } catch (e) { - logger.stdout(' Unable to write source for file: $e'); - } - } - } - applyHook(); - } - - void _displayChangeDiff(DartFixListener migrationResults) { - Map> fileSuggestions = {}; - for (DartFixSuggestion suggestion in migrationResults.suggestions) { - String file = suggestion.location.file; - fileSuggestions.putIfAbsent(file, () => []); - fileSuggestions[file]!.add(suggestion); - } - - // present a diff-like view - var diffStyle = DiffStyle(logger.ansi); - for (SourceFileEdit sourceFileEdit in migrationResults.sourceChange.edits) { - String file = sourceFileEdit.file; - String relPath = pathContext.relative(file, from: options.directory); - var edits = sourceFileEdit.edits; - int count = edits.length; - - logger.stdout(''); - logger.stdout('${ansi.emphasized(relPath)} ' - '($count ${_pluralize(count, 'change')}):'); - - String? source; - try { - source = resourceProvider.getFile(file).readAsStringSync(); - } catch (_) {} - - if (source == null) { - logger.stdout(' (unable to retrieve source for file)'); - } else { - for (var line - in diffStyle.formatDiff(source, _sourceEditsToAtomicEdits(edits))) { - logger.stdout(' $line'); - } - } - } - } - - void _logAlreadyMigrated() { - logger.stdout(migratedAlready); - } - - void _logErrors(AnalysisResult analysisResult) { - logger.stdout(''); - - var issueCount = analysisResult.errors.length; - logger.stdout( - '$issueCount analysis ${_pluralize(issueCount, 'issue')} found:'); - - _IssueRenderer renderer = - _IssueRenderer(logger, options.directory, pathContext, lineInfo); - for (AnalysisError error in analysisResult.errors) { - renderer.render(error); - } - logger.stdout(''); - _hasAnalysisErrors = true; - - if (options.ignoreErrors!) { - logger.stdout('Note: analysis errors will result in erroneous migration ' - 'suggestions.'); - logger.stdout('Continuing with migration suggestions due to the use of ' - '--${CommandLineOptions.ignoreErrorsFlag}.'); - } else { - // Fail with how to continue. - logger.stdout("The migration tool didn't start, due to analysis errors."); - logger.stdout(''); - if (analysisResult.hasImportErrors) { - logger.stdout(''' -The following steps might fix your problem: -1. Run `dart pub get`. -2. Try running `dart migrate` again. -'''); - } else if (analysisResult.allSourcesAlreadyMigrated) { - logger.stdout(''' -The following steps might fix your problem: -1. Set the lower SDK constraint (in pubspec.yaml) to a version before 2.12. -2. Run `dart pub get`. -3. Try running `dart migrate` again. -'''); - } else { - const ignoreErrors = CommandLineOptions.ignoreErrorsFlag; - logger.stdout(''' -We recommend fixing the analysis issues before running `dart migrate`. -Alternatively, you can run `dart migrate --$ignoreErrors`, but you might -get erroneous migration suggestions. -'''); - } - logger.stdout( - 'More information: https://dart.dev/go/null-safety-migration'); - } - } - - Future _rerunFunction() async { - logger.stdout(ansi.emphasized('Re-analyzing project...')); - - _dartFixListener!.reset(); - await _fixCodeProcessor!.prepareToRerun(); - var analysisResult = await _fixCodeProcessor!.runFirstPhase(); - if (analysisResult.hasErrors && !options.ignoreErrors!) { - _logErrors(analysisResult); - return MigrationState( - _fixCodeProcessor!._task.migration, - _fixCodeProcessor!._task.includedRoot, - _dartFixListener, - _fixCodeProcessor!._task.instrumentationListener, - {}, - _fixCodeProcessor!._task.shouldBeMigratedFunction, - analysisResult); - } else if (analysisResult.allSourcesAlreadyMigrated) { - _logAlreadyMigrated(); - return MigrationState( - _fixCodeProcessor!._task.migration, - _fixCodeProcessor!._task.includedRoot, - _dartFixListener, - _fixCodeProcessor!._task.instrumentationListener, - {}, - _fixCodeProcessor!._task.shouldBeMigratedFunction, - analysisResult); - } else { - logger.stdout(ansi.emphasized('Re-generating migration suggestions...')); - return await _fixCodeProcessor!.runLaterPhases(); - } - } - - List _sortEdits(SourceFileEdit sourceFileEdit) { - // Sort edits in reverse offset order. - List edits = sourceFileEdit.edits.toList(); - edits.sort((a, b) { - return b.offset - a.offset; - }); - return edits; - } - - static Map> _sourceEditsToAtomicEdits( - List edits) { - return { - for (var edit in edits) - edit.offset: [AtomicEdit.replace(edit.length, edit.replacement)] - }; - } -} - -/// Exception thrown by [MigrationCli] if the client should exit. -class MigrationExit { - /// The exit code that the client should set. - final int exitCode; - - MigrationExit(this.exitCode); -} - -/// An abstraction over the static methods on [Process]. -/// -/// Used in tests to run mock processes. -abstract class ProcessManager { - const factory ProcessManager.system() = SystemProcessManager; - - /// Run a process synchronously, as in [Process.runSync]. - ProcessResult runSync(String executable, List arguments, - {String? workingDirectory}); -} - -/// A [ProcessManager] that directs all method calls to static methods of -/// [Process], in order to run real processes. -class SystemProcessManager implements ProcessManager { - const SystemProcessManager(); - - ProcessResult runSync(String executable, List arguments, - {String? workingDirectory}) => - Process.runSync(executable, arguments, - workingDirectory: workingDirectory ?? Directory.current.path); -} - -class _BadArgException implements Exception { - final String message; - - _BadArgException(this.message); -} - -class _FixCodeProcessor extends Object { - static const numPhases = 3; - - final DriverBasedAnalysisContext context; - - /// The task used to migrate to NNBD. - late final NonNullableFix _task; - - Set pathsToProcess; - - late ProgressBar _progressBar; - - final MigrationCliRunner _migrationCli; - - _FixCodeProcessor(this.context, this._migrationCli) - : pathsToProcess = _migrationCli.computePathsToProcess(context); - - bool get isPreviewServerRunning => _task.isPreviewServerRunning; - - Future prepareToRerun() async { - var driver = context.driver; - pathsToProcess = _migrationCli.computePathsToProcess(context); - pathsToProcess.forEach(driver.changeFile); - await driver.applyPendingFileChanges(); - } - - /// Call the supplied [process] function to process each compilation unit. - Future processResources( - Future Function(ResolvedUnitResult result) process) async { - var driver = context.currentSession; - var pathsProcessed = {}; - for (var path in pathsToProcess) { - if (pathsProcessed.contains(path)) continue; - var result = await driver.getResolvedLibrary(path); - // Parts will either be found in a library, below, or if the library - // isn't [isIncluded], will be picked up in the final loop. - if (result is ResolvedLibraryResult) { - for (var unit in result.units) { - if (!pathsProcessed.contains(unit.path)) { - await process(unit); - pathsProcessed.add(unit.path); - } - } - } - } - - for (var path in pathsToProcess.difference(pathsProcessed)) { - var result = await driver.getResolvedUnit(path); - if (result is ResolvedUnitResult) { - await process(result); - } - } - } - - void registerCodeTask(NonNullableFix task) { - _task = task; - } - - Future runFirstPhase() async { - var analysisErrors = []; - - // All tasks should be registered; [numPhases] should be finalized. - _progressBar = ProgressBar(_migrationCli.logger, pathsToProcess.length); - - // Process each source file. - bool allSourcesAlreadyMigrated = true; - await processResources((ResolvedUnitResult result) async { - if (!result.unit.featureSet.isEnabled(Feature.non_nullable)) { - allSourcesAlreadyMigrated = false; - } - _progressBar.tick(); - List errors = result.errors - .where((error) => error.severity == Severity.error) - .toList(); - if (errors.isNotEmpty) { - analysisErrors.addAll(errors); - _migrationCli.lineInfo[result.path] = result.lineInfo; - } - if (_migrationCli.options.ignoreErrors! || analysisErrors.isEmpty) { - await _task.prepareUnit(result); - } - }); - - var unmigratedDependencies = _task.migration!.unmigratedDependencies; - if (unmigratedDependencies.isNotEmpty) { - if (_migrationCli.options.skipImportCheck!) { - _migrationCli.logger.stdout(unmigratedDependenciesWarning); - } else { - throw ExperimentStatusException.unmigratedDependencies( - unmigratedDependencies); - } - } - - return AnalysisResult( - analysisErrors, - _migrationCli.lineInfo, - _migrationCli.pathContext, - _migrationCli.options.directory, - allSourcesAlreadyMigrated); - } - - Future runLaterPhases() async { - _progressBar = ProgressBar( - _migrationCli.logger, pathsToProcess.length * (numPhases - 1)); - - await processResources((ResolvedUnitResult result) async { - _progressBar.tick(); - await _task.processUnit(result); - }); - await processResources((ResolvedUnitResult result) async { - _progressBar.tick(); - if (_migrationCli.shouldBeMigrated(result.path)) { - await _task.finalizeUnit(result); - } - }); - _progressBar.complete(); - _migrationCli.logger.stdout(_migrationCli.ansi - .emphasized('Compiling instrumentation information...')); - // Update the tasks paths-to-process, in case of new or deleted files. - _task.pathsToProcess = pathsToProcess; - var state = await _task.finish(); - _task.processPackage(context.contextRoot.root, state.neededPackages); - if (_migrationCli.options.webPreview!) { - await _task.startPreviewServer(state, _migrationCli.applyHook); - } - state.previewUrls = _task.previewUrls; - - return state; - } -} - -/// Given a Logger and an analysis issue, render the issue to the logger. -class _IssueRenderer { - final Logger logger; - final String rootDirectory; - final Context pathContext; - final Map lineInfo; - - _IssueRenderer( - this.logger, this.rootDirectory, this.pathContext, this.lineInfo); - - void render(AnalysisError issue) { - // severity • Message ... at foo/bar.dart:6:1 • (error_code) - var lineInfoForThisFile = lineInfo[issue.source.fullName]!; - var location = lineInfoForThisFile.getLocation(issue.offset); - - final Ansi ansi = logger.ansi; - - logger.stdout( - ' ${ansi.error(issue.severity.name)} • ' - '${ansi.emphasized(_removePeriod(issue.message))} ' - 'at ${pathContext.relative(issue.source.fullName, from: rootDirectory)}' - ':${location.lineNumber}:${location.columnNumber} ' - '• (${issue.errorCode.name.toLowerCase()})', - ); - } -} - -extension on Severity { - /// Returns the simple name of the Severity, as a String. - String get name { - switch (this) { - case Severity.error: - return 'error'; - case Severity.warning: - return 'warning'; - case Severity.info: - return 'info'; - } - } -} diff --git a/pkg/nnbd_migration/lib/nnbd_migration.dart b/pkg/nnbd_migration/lib/nnbd_migration.dart deleted file mode 100644 index a948a9fee022..000000000000 --- a/pkg/nnbd_migration/lib/nnbd_migration.dart +++ /dev/null @@ -1,372 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'dart:convert'; - -import 'package:analyzer/dart/analysis/results.dart'; -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:analyzer_plugin/protocol/protocol_common.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/src/nullability_migration_impl.dart'; -import 'package:pub_semver/pub_semver.dart'; - -export 'package:nnbd_migration/src/utilities/hint_utils.dart' show HintComment; - -/// Description of fixes that might be performed by nullability migration. -class NullabilityFixDescription { - /// A `.then((value) => ...)` suffix was added to an expression. - static const addThen = NullabilityFixDescription._( - appliedMessage: 'Added `.then` to adjust type of Future expression', - kind: NullabilityFixKind.addThen); - - /// An import was added to the library. - static const addImport = NullabilityFixDescription._( - appliedMessage: 'Added import for use in migrated code', - kind: NullabilityFixKind.addImport); - - /// A variable declaration needs to be marked as "late". - static const addLate = NullabilityFixDescription._( - appliedMessage: 'Added a late keyword', kind: NullabilityFixKind.addLate); - - /// A variable declaration needs to be marked as "late" due to the presence of - /// a `/*late*/` hint. - static const addLateDueToHint = NullabilityFixDescription._( - appliedMessage: 'Added a late keyword, due to a hint', - kind: NullabilityFixKind.addLateDueToHint); - - /// A variable declaration needs to be marked as "late" due to being certainly - /// assigned in test setup. - static const addLateDueToTestSetup = NullabilityFixDescription._( - appliedMessage: 'Added a late keyword, due to assignment in `setUp`', - kind: NullabilityFixKind.addLateDueToTestSetup); - - /// A variable declaration needs to be marked as "late" and "final" due to the - /// presence of a `/*late final*/` hint. - static const addLateFinalDueToHint = NullabilityFixDescription._( - appliedMessage: 'Added late and final keywords, due to a hint', - kind: NullabilityFixKind.addLateFinalDueToHint); - - /// An expression's value needs to be null-checked. - static const checkExpression = NullabilityFixDescription._( - appliedMessage: 'Added a non-null assertion to nullable expression', - kind: NullabilityFixKind.checkExpression, - ); - - /// An expression's value will be null-checked due to a hint. - static const checkExpressionDueToHint = NullabilityFixDescription._( - appliedMessage: 'Accepted a null check hint', - kind: NullabilityFixKind.checkExpressionDueToHint, - ); - - /// A compound assignment's combiner operator returns a type that isn't - /// assignable to the LHS of the assignment. - static const compoundAssignmentHasBadCombinedType = - NullabilityFixDescription._( - appliedMessage: 'Compound assignment has bad combined type', - kind: NullabilityFixKind.compoundAssignmentHasBadCombinedType, - ); - - /// A compound assignment's LHS has a nullable type. - static const compoundAssignmentHasNullableSource = - NullabilityFixDescription._( - appliedMessage: 'Compound assignment has nullable source', - kind: NullabilityFixKind.compoundAssignmentHasNullableSource, - ); - - /// Informative message: a condition of an if-test or conditional expression - /// will always evaluate to `false` in strong checking mode. - static const conditionFalseInStrongMode = NullabilityFixDescription._( - appliedMessage: 'Condition will always be false in strong checking mode', - kind: NullabilityFixKind.conditionFalseInStrongMode); - - /// Informative message: a condition of an if-test or conditional expression - /// will always evaluate to `true` in strong checking mode. - static const conditionTrueInStrongMode = NullabilityFixDescription._( - appliedMessage: 'Condition will always be true in strong checking mode', - kind: NullabilityFixKind.conditionTrueInStrongMode); - - /// An if-test or conditional expression needs to have its condition - /// discarded. - static const discardCondition = NullabilityFixDescription._( - appliedMessage: 'Discarded a condition which is always true', - kind: NullabilityFixKind.removeDeadCode, - ); - - /// An if-test or conditional expression needs to have its condition and - /// "else" branch discarded. - static const discardElse = NullabilityFixDescription._( - appliedMessage: 'Discarded an unreachable conditional else branch', - kind: NullabilityFixKind.removeDeadCode, - ); - - /// An if-test or conditional expression needs to have its condition and - /// "then" branch discarded. - static const discardThen = NullabilityFixDescription._( - appliedMessage: - 'Discarded a condition which is always false, and the "then" branch ' - 'that follows', - kind: NullabilityFixKind.removeDeadCode, - ); - - /// An if-test needs to be discarded completely. - static const discardIf = NullabilityFixDescription._( - appliedMessage: 'Discarded an if-test with no effect', - kind: NullabilityFixKind.removeDeadCode, - ); - - static const downcastExpression = NullabilityFixDescription._( - appliedMessage: 'Added a downcast to an expression', - kind: NullabilityFixKind.downcastExpression, - ); - - /// Informative message: there is no valid migration for `null` in a - /// non-nullable context. - static const noValidMigrationForNull = NullabilityFixDescription._( - appliedMessage: 'No valid migration for expression with type `Null` in ' - 'a non-nullable context', - kind: NullabilityFixKind.noValidMigrationForNull); - - /// Informative message: a null-aware access won't be necessary in strong - /// checking mode. - static const nullAwarenessUnnecessaryInStrongMode = - NullabilityFixDescription._( - appliedMessage: - 'Null-aware access will be unnecessary in strong checking mode', - kind: NullabilityFixKind.nullAwarenessUnnecessaryInStrongMode); - - /// Informative message: a null-aware assignment won't be necessary in strong - /// checking mode. - static const nullAwareAssignmentUnnecessaryInStrongMode = - NullabilityFixDescription._( - appliedMessage: - 'Null-aware assignment will be unnecessary in strong checking mode', - kind: NullabilityFixKind.nullAwareAssignmentUnnecessaryInStrongMode); - - static const otherCastExpression = NullabilityFixDescription._( - appliedMessage: 'Added a cast to an expression (non-downcast)', - kind: NullabilityFixKind.otherCastExpression, - ); - - /// An unnecessary downcast has been discarded. - static const removeLanguageVersionComment = NullabilityFixDescription._( - appliedMessage: 'Removed language version comment so that null safety ' - 'features will be allowed in this file', - kind: NullabilityFixKind.removeLanguageVersionComment, - ); - - /// An unnecessary downcast has been discarded. - static const removeAs = NullabilityFixDescription._( - appliedMessage: 'Discarded a downcast that is now unnecessary', - kind: NullabilityFixKind.removeAs, - ); - - /// A null-aware operator needs to be changed into its non-null-aware - /// equivalent. - static const removeNullAwareness = NullabilityFixDescription._( - appliedMessage: - 'Changed a null-aware access into an ordinary access, because the target cannot be null', - kind: NullabilityFixKind.removeDeadCode); - - /// A null-aware assignment was removed because its LHS is non-nullable. - static const removeNullAwareAssignment = NullabilityFixDescription._( - appliedMessage: - 'Removed a null-aware assignment, because the target cannot be null', - kind: NullabilityFixKind.removeDeadCode); - - /// A built_value `@nullable` annotation has been discarded. - static const removeNullableAnnotation = NullabilityFixDescription._( - appliedMessage: 'Discarded a use of the built_value annotation @nullable', - kind: NullabilityFixKind.removeNullableAnnotation, - ); - - /// A message used to indicate a fix has been applied. - final String appliedMessage; - - /// The kind of fix described. - final NullabilityFixKind kind; - - /// A formal parameter needs to have a required keyword added. - factory NullabilityFixDescription.addRequired( - String? className, String? functionName, String paramName) { - var paramContainerName = - className == null ? functionName! : "'$className.$functionName'"; - return NullabilityFixDescription._( - appliedMessage: "Add 'required' keyword to parameter '$paramName' in " - '$paramContainerName', - kind: NullabilityFixKind.addRequired, - ); - } - - /// An explicit type needs to be added. - factory NullabilityFixDescription.addType(String typeText) => - NullabilityFixDescription._( - appliedMessage: "Add the explicit type '$typeText'", - kind: NullabilityFixKind.replaceVar, - ); - - /// A method call was changed from calling one method to another. - factory NullabilityFixDescription.changeMethodName( - String oldName, String newName) => - NullabilityFixDescription._( - appliedMessage: "Changed method '$oldName' to '$newName'", - kind: NullabilityFixKind.changeMethodName); - - /// An explicit type mentioned in the source program needs to be made - /// nullable. - factory NullabilityFixDescription.makeTypeNullable(String type) => - NullabilityFixDescription._( - appliedMessage: "Changed type '$type' to be nullable", - kind: NullabilityFixKind.makeTypeNullable, - ); - - /// An explicit type mentioned in the source program will be made - /// nullable due to a nullability hint. - factory NullabilityFixDescription.makeTypeNullableDueToHint(String type) => - NullabilityFixDescription._( - appliedMessage: - "Changed type '$type' to be nullable, due to a nullability hint", - kind: NullabilityFixKind.makeTypeNullableDueToHint, - ); - - /// A 'var' declaration needs to be replaced with an explicit type. - factory NullabilityFixDescription.replaceVar(String typeText) => - NullabilityFixDescription._( - appliedMessage: "Replace 'var' with '$typeText'", - kind: NullabilityFixKind.replaceVar, - ); - - /// An explicit type mentioned in the source program does not need to be made - /// nullable. - factory NullabilityFixDescription.typeNotMadeNullable(String type) => - NullabilityFixDescription._( - appliedMessage: "Type '$type' was not made nullable", - kind: NullabilityFixKind.typeNotMadeNullable, - ); - - /// An explicit type mentioned in the source program does not need to be made - /// nullable. - factory NullabilityFixDescription.typeNotMadeNullableDueToHint(String type) => - NullabilityFixDescription._( - appliedMessage: "Type '$type' was not made nullable due to a hint", - kind: NullabilityFixKind.typeNotMadeNullableDueToHint, - ); - - const NullabilityFixDescription._( - {required this.appliedMessage, required this.kind}); - - @override - int get hashCode => Object.hash(appliedMessage, kind); - - @override - bool operator ==(Object other) => - other is NullabilityFixDescription && - appliedMessage == other.appliedMessage && - kind == other.kind; - - @override - String toString() => - 'NullabilityFixDescription(${json.encode(appliedMessage)}, $kind)'; -} - -/// An enumeration of the various kinds of nullability fixes. -enum NullabilityFixKind { - addThen, - addImport, - addLate, - addLateDueToHint, - addLateDueToTestSetup, - addLateFinalDueToHint, - addRequired, - addType, - changeMethodName, - checkExpression, - checkExpressionDueToHint, - compoundAssignmentHasNullableSource, - compoundAssignmentHasBadCombinedType, - conditionFalseInStrongMode, - conditionTrueInStrongMode, - downcastExpression, - makeTypeNullable, - makeTypeNullableDueToHint, - noValidMigrationForNull, - nullAwarenessUnnecessaryInStrongMode, - nullAwareAssignmentUnnecessaryInStrongMode, - otherCastExpression, - removeAs, - removeDeadCode, - removeLanguageVersionComment, - removeNullableAnnotation, - replaceVar, - typeNotMadeNullable, - typeNotMadeNullableDueToHint, -} - -/// Provisional API for DartFix to perform nullability migration. -/// -/// Usage: pass each input source file to [prepareInput]. Then pass each input -/// source file to [processInput]. Then pass each input source file to -/// [finalizeInput]. Then call [finish] to obtain the modifications that need -/// to be made to each source file. -abstract class NullabilityMigration { - /// Prepares to perform nullability migration. - /// - /// If [permissive] is `true`, exception handling logic will try to proceed - /// as far as possible even though the migration algorithm is not yet - /// complete. TODO(paulberry): remove this mode once the migration algorithm - /// is fully implemented. - /// - /// Optional parameter [removeViaComments] indicates whether code that the - /// migration tool wishes to remove should instead be commenting it out. - /// - /// Optional parameter [warnOnWeakCode] indicates whether weak-only code - /// should be warned about or removed (in the way specified by - /// [removeViaComments]). - factory NullabilityMigration(NullabilityMigrationListener? listener, - {bool? permissive, - NullabilityMigrationInstrumentation? instrumentation, - bool? removeViaComments, - bool warnOnWeakCode}) = NullabilityMigrationImpl; - - /// Check if this migration is being run permissively. - bool? get isPermissive; - - /// Use this getter after any calls to [prepareInput] to obtain a list of URIs - /// of unmigrated dependencies. Ideally, this list should be empty before the - /// user tries to migrate their package. - List get unmigratedDependencies; - - void finalizeInput(ResolvedUnitResult result); - - /// Finishes the migration. Returns a map indicating packages that have been - /// newly imported by the migration; the caller should ensure that these - /// packages are properly imported by the package's pubspec. - /// - /// Keys of the returned map are package names; values indicate the minimum - /// required version of each package. - Map finish(); - - void prepareInput(ResolvedUnitResult result); - - void processInput(ResolvedUnitResult result); - - /// Update the migration after an edge has been added or removed. - void update(); -} - -/// [NullabilityMigrationListener] is used by [NullabilityMigration] -/// to communicate source changes or "fixes" to the client. -abstract class NullabilityMigrationListener { - /// [addEdit] is called once for each source edit, in the order in which they - /// appear in the source file. - void addEdit(Source source, SourceEdit edit); - - void addSuggestion(String descriptions, Location location); - - /// [reportException] is called once for each exception that occurs in - /// "permissive mode", reporting the location of the exception and the - /// exception details. - void reportException( - Source? source, AstNode? node, Object exception, StackTrace stackTrace); -} diff --git a/pkg/nnbd_migration/lib/nullability_state.dart b/pkg/nnbd_migration/lib/nullability_state.dart deleted file mode 100644 index 0adfd38c6641..000000000000 --- a/pkg/nnbd_migration/lib/nullability_state.dart +++ /dev/null @@ -1,76 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -/// State representation used to determine whether a nullability node expresses -/// non-null intent. -class NonNullIntent { - /// State of a nullability node for which no non-null intent has been seen. - static const none = NonNullIntent._('none', false); - - /// State of a nullability node for which indirect evidence of non-null intent - /// has been seen (e.g. an assertion or a use of a value in a non-null - /// context). - static const indirect = NonNullIntent._('indirect', true); - - /// State of a nullability node for which direct evidence of non-null intent - /// has been seen (e.g. an explicit "/*!*/" on a type, or a non-nullable type - /// coming from a migrated library). - static const direct = NonNullIntent._('direct', true, isDirect: true); - - final String name; - - /// Indicates whether this state represents a determination that non-null - /// intent is present. - final bool isPresent; - - /// Indicates whether this state represents a direct determination of non-null - /// intent (see [direct]). - final bool isDirect; - - const NonNullIntent._(this.name, this.isPresent, {this.isDirect = false}); - - /// Returns a [NonNullIntent] object representing the result of adding - /// indirect non-null intent to `this`. - NonNullIntent addIndirect() => isPresent ? this : indirect; - - @override - String toString() => name; -} - -/// State of a nullability node. -class Nullability { - /// State of a nullability node that has been determined to be non-nullable - /// by propagating upstream. - static const nonNullable = Nullability._('non-nullable', false); - - /// State of a nullability node that has been determined to be nullable by - /// propagating downstream. - static const ordinaryNullable = Nullability._('ordinary nullable', true); - - /// State of a nullability node that has been determined to be nullable by - /// propagating upstream from a contravariant use of a generic. - static const exactNullable = - Nullability._('exact nullable', true, isExactNullable: true); - - /// Name of the state (for use in debugging). - final String name; - - /// Indicates whether the given state should be considered nullable. - /// - /// After propagation, any nodes that remain in the undetermined state are - /// considered to be non-nullable, so this field is returns `false` for nodes - /// in that state. - final bool isNullable; - - /// Indicates whether a node in this state is "exact nullable", meaning that - /// is needs to be nullable because it represents a type argument that will - /// later be used in a contravariant way that requires it to be nullable. - final bool isExactNullable; - - const Nullability._(this.name, this.isNullable, - {this.isExactNullable = false}); - - @override - String toString() => name; -} diff --git a/pkg/nnbd_migration/lib/src/already_migrated_code_decorator.dart b/pkg/nnbd_migration/lib/src/already_migrated_code_decorator.dart deleted file mode 100644 index 6a357ab51419..000000000000 --- a/pkg/nnbd_migration/lib/src/already_migrated_code_decorator.dart +++ /dev/null @@ -1,137 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/dart/element/nullability_suffix.dart'; -import 'package:analyzer/dart/element/type.dart'; -import 'package:analyzer/dart/element/type_provider.dart'; -import 'package:analyzer/src/dart/element/type.dart'; -import 'package:analyzer/src/generated/element_type_provider.dart'; -import 'package:nnbd_migration/src/decorated_type.dart'; -import 'package:nnbd_migration/src/edge_origin.dart'; -import 'package:nnbd_migration/src/nullability_node.dart'; -import 'package:nnbd_migration/src/nullability_node_target.dart'; - -/// This class transforms ordinary [DartType]s into their corresponding -/// [DecoratedType]s, assuming the [DartType]s come from code that has already -/// been migrated to NNBD. -class AlreadyMigratedCodeDecorator { - final NullabilityGraph _graph; - - final TypeProvider _typeProvider; - - AlreadyMigratedCodeDecorator(this._graph, this._typeProvider); - - /// Transforms [type], which should have come from code that has already been - /// migrated to NNBD, into the corresponding [DecoratedType]. - /// - /// TODO(paulberry): do we still need element or can we use target now? - DecoratedType decorate( - DartType type, Element element, NullabilityNodeTarget target) { - if (type is VoidType || type is DynamicType) { - var node = NullabilityNode.forAlreadyMigrated(target); - _graph.makeNullableUnion( - node, AlwaysNullableTypeOrigin.forElement(element, type is VoidType)); - return DecoratedType(type, node); - } - NullabilityNode node; - var nullabilitySuffix = type.nullabilitySuffix; - if (nullabilitySuffix == NullabilitySuffix.question) { - node = NullabilityNode.forAlreadyMigrated(target); - _graph.makeNullableUnion( - node, AlreadyMigratedTypeOrigin.forElement(element, true)); - } else { - node = NullabilityNode.forAlreadyMigrated(target); - _graph.makeNonNullableUnion( - node, AlreadyMigratedTypeOrigin.forElement(element, false)); - } - if (type is FunctionType) { - for (var element in type.typeFormals) { - DecoratedTypeParameterBounds.current!.put( - element, - decorate( - element.bound ?? - (_typeProvider.objectType as TypeImpl) - .withNullability(NullabilitySuffix.question), - element, - target.typeFormalBound(element.name))); - } - var positionalParameters = []; - var namedParameters = {}; - int index = 0; - for (var parameter in type.parameters) { - if (parameter.isPositional) { - positionalParameters.add(decorate( - parameter.type, element, target.positionalParameter(index++))); - } else { - var name = parameter.name; - namedParameters[name] = - decorate(parameter.type, element, target.namedParameter(name)); - } - } - return DecoratedType(type, node, - returnType: decorate(type.returnType, element, target.returnType()), - namedParameters: namedParameters, - positionalParameters: positionalParameters); - } else if (type is InterfaceType) { - var typeParameters = type.element.typeParameters; - if (typeParameters.isNotEmpty) { - assert(type.typeArguments.length == typeParameters.length); - int index = 0; - return DecoratedType(type, node, typeArguments: [ - for (var t in type.typeArguments) - decorate(t, element, target.typeArgument(index++)) - ]); - } - return DecoratedType(type, node); - } else if (type is TypeParameterType) { - return DecoratedType(type, node); - } else if (type.isBottom) { - return DecoratedType(type, node); - } else { - // TODO(paulberry) - throw UnimplementedError( - 'Unable to decorate already-migrated type $type'); - } - } - - /// Get all the decorated immediate supertypes of the non-migrated class - /// [class_]. - Iterable getImmediateSupertypes(InterfaceElement class_) { - var allSupertypes = []; - InterfaceType? supertype; - if (class_ is ClassElement) { - supertype = class_.supertype; - } - if (supertype != null) { - allSupertypes.add(supertype); - } - if (class_ is MixinElement) { - allSupertypes.addAll(class_.superclassConstraints); - } - allSupertypes.addAll(class_.preMigrationInterfaces); - allSupertypes.addAll(class_.mixins); - var type = class_.thisType; - if (type.isDartAsyncFuture) { - // Add FutureOr as a supertype of Future. - allSupertypes.add(_typeProvider.futureOrType(type.typeArguments.single)); - } - return [ - for (var t in allSupertypes) - decorate(t, class_, NullabilityNodeTarget.element(class_)) - ]; - } -} - -extension on InterfaceElement { - List get preMigrationInterfaces { - var previousElementTypeProvider = ElementTypeProvider.current; - try { - ElementTypeProvider.current = const ElementTypeProvider(); - return interfaces; - } finally { - ElementTypeProvider.current = previousElementTypeProvider; - } - } -} diff --git a/pkg/nnbd_migration/lib/src/conditional_discard.dart b/pkg/nnbd_migration/lib/src/conditional_discard.dart deleted file mode 100644 index c94b5ea29801..000000000000 --- a/pkg/nnbd_migration/lib/src/conditional_discard.dart +++ /dev/null @@ -1,57 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/src/nullability_node.dart'; - -/// Container for information gathered during nullability migration about a -/// conditional check that might need to be discarded. -/// -/// This information will be associated with an Expression in the input program -/// whose boolean value influences control flow (e.g. the condition of an `if` -/// statement). -/// -/// TODO(paulberry): simplify this once PotentialModification is no longer -/// needed. -class ConditionalDiscard { - /// Nullability node that will be `nullable` if the code path that results - /// from the condition evaluating to `true` will be reachable after - /// nullability migration, and therefore should be kept. - /// - /// `null` if the code path should be kept regardless of the outcome of - /// migration. - final NullabilityNode? trueGuard; - - /// Nullability node that will be `nullable` if the code path that results - /// from the condition evaluating to `false` will be reachable after - /// nullability migration, and therefore should be kept. - /// - /// `null` if the code path should be kept regardless of the outcome of - /// migration. - final NullabilityNode? falseGuard; - - /// Indicates whether the condition is pure (free from side effects). - /// - /// For example, a condition like `x == null` is pure (assuming `x` is a local - /// variable or static variable), because evaluating it has no user-visible - /// effect other than returning a boolean value. - /// - /// If [pureCondition] is `false`, and either [trueGuard] or [falseGuard] is - /// `false`, that it is safe to delete the condition expression as well as the - /// dead code branch (e.g. it means that `if (x == null) f(); else g();` could - /// be changed to simply `g();`). - final bool pureCondition; - - ConditionalDiscard(this.trueGuard, this.falseGuard, this.pureCondition); - - /// Indicates whether the code path that results from the condition evaluating - /// to `false` is reachable after migration. - bool get keepFalse => falseGuard == null || falseGuard!.isNullable; - - /// Indicates whether the code path that results from the condition evaluating - /// to `true` is reachable after migration. - bool get keepTrue => trueGuard == null || trueGuard!.isNullable; - - FixReasonInfo? get reason => !keepTrue ? trueGuard : falseGuard; -} diff --git a/pkg/nnbd_migration/lib/src/decorated_class_hierarchy.dart b/pkg/nnbd_migration/lib/src/decorated_class_hierarchy.dart deleted file mode 100644 index 0e448dc51b84..000000000000 --- a/pkg/nnbd_migration/lib/src/decorated_class_hierarchy.dart +++ /dev/null @@ -1,134 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/dart/element/nullability_suffix.dart'; -import 'package:analyzer/dart/element/type.dart'; -import 'package:nnbd_migration/src/decorated_type.dart'; -import 'package:nnbd_migration/src/nullability_node.dart'; -import 'package:nnbd_migration/src/variables.dart'; - -/// Responsible for building and maintaining information about nullability -/// decorations related to the class hierarchy. -/// -/// For instance, if one class is a subclass of the other, we record the -/// nullabilities of all the types involved in the subclass relationship. -class DecoratedClassHierarchy { - final Variables? _variables; - - final NullabilityGraph _graph; - - /// Cache for speeding up the computation of - /// [_getGenericSupertypeDecorations]. - final Map> - _genericSupertypeDecorations = {}; - - DecoratedClassHierarchy(this._variables, this._graph); - - /// Retrieves a [DecoratedType] describing how [type] implements [superclass]. - /// - /// If the [type] is a [TypeParameterType], it will be resolved against its - /// bound. - DecoratedType asInstanceOf(DecoratedType type, InterfaceElement? superclass) { - if (superclass != null && - superclass.thisType.isDartAsyncFutureOr && - !type.type!.isDartAsyncFuture && - !type.type!.isDartAsyncFutureOr) { - return DecoratedType( - superclass.instantiate( - typeArguments: [type.type!], - nullabilitySuffix: NullabilitySuffix.none), - type.node, - typeArguments: [type]); - } - type = _getInterfaceType(type); - var typeType = type.type as InterfaceType; - var class_ = typeType.element; - if (class_ == superclass) return type; - var result = getDecoratedSupertype(class_, superclass!); - if (result.typeArguments.isNotEmpty && type.typeArguments.isNotEmpty) { - // TODO(paulberry): test - result = result.substitute(type.asSubstitution); - } - return result.withNode(type.node); - } - - /// Retrieves a [DecoratedType] describing how [class_] implements - /// [superclass]. - /// - /// If [class_] does not implement [superclass], raises an exception. - /// - /// Note that the returned [DecoratedType] will have a node of `never`, - /// because the relationship between a class and its superclass is not - /// nullable. - DecoratedType getDecoratedSupertype( - InterfaceElement class_, InterfaceElement superclass) { - assert(!(class_.library.isDartCore && class_.name == 'Null')); - if (superclass.typeParameters.isEmpty) { - return DecoratedType( - superclass.instantiate( - typeArguments: const [], - nullabilitySuffix: NullabilitySuffix.none, - ), - _graph.never, - ); - } - return _getGenericSupertypeDecorations(class_)[superclass] ?? - (throw StateError('Unrelated types: $class_ and $superclass')); - } - - /// Computes a map whose keys are all the superclasses of [class_], and whose - /// values indicate how [class_] implements each superclass. - Map _getGenericSupertypeDecorations( - InterfaceElement class_) { - var decorations = _genericSupertypeDecorations[class_]; - if (decorations == null) { - // Call ourselves recursively to compute how each of [class_]'s direct - // superclasses relates to all of its transitive superclasses. - decorations = {}; - var decoratedDirectSupertypes = - _variables!.decoratedDirectSupertypes(class_); - for (var entry in decoratedDirectSupertypes.entries) { - var superclass = entry.key; - var decoratedSupertype = entry.value!; - var supertype = decoratedSupertype.type as InterfaceType; - // Compute a type substitution to determine how [class_] relates to - // this specific [superclass]. - Map substitution = {}; - for (int i = 0; i < supertype.typeArguments.length; i++) { - substitution[supertype.element.typeParameters[i]] = - decoratedSupertype.typeArguments[i]!; - } - // Apply that substitution to the relation between [superclass] and - // each of its transitive superclasses, to determine the relation - // between [class_] and the transitive superclass. - var recursiveSupertypeDecorations = - _getGenericSupertypeDecorations(superclass); - for (var entry in recursiveSupertypeDecorations.entries) { - decorations[entry.key] ??= entry.value.substitute(substitution); - } - // Also record the relation between [class_] and its direct - // superclass. - decorations[superclass] ??= decoratedSupertype; - } - _genericSupertypeDecorations[class_] = decorations; - } - return decorations; - } - - DecoratedType _getInterfaceType(DecoratedType type) { - var typeType = type.type; - if (typeType is InterfaceType) { - return type; - } - - if (typeType is TypeParameterType) { - final innerType = _getInterfaceType( - _variables!.decoratedTypeParameterBound(typeType.element)!); - return type.substitute({typeType.element: innerType}); - } - - throw ArgumentError('$type is an unexpected type'); - } -} diff --git a/pkg/nnbd_migration/lib/src/decorated_type.dart b/pkg/nnbd_migration/lib/src/decorated_type.dart deleted file mode 100644 index 35fe682ec392..000000000000 --- a/pkg/nnbd_migration/lib/src/decorated_type.dart +++ /dev/null @@ -1,695 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/dart/element/nullability_suffix.dart'; -import 'package:analyzer/dart/element/type.dart'; -import 'package:analyzer/dart/element/type_provider.dart'; -import 'package:analyzer/src/dart/element/element.dart'; -import 'package:analyzer/src/dart/element/type.dart'; -import 'package:analyzer/src/dart/element/type_algebra.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/src/nullability_node.dart'; -import 'package:nnbd_migration/src/nullability_node_target.dart'; - -/// Representation of a type in the code to be migrated. In addition to -/// tracking the (unmigrated) [DartType], we track the [ConstraintVariable]s -/// indicating whether the type, and the types that compose it, are nullable. -class DecoratedType implements DecoratedTypeInfo, SubstitutedType { - @override - final DartType? type; - - @override - final NullabilityNode node; - - @override - final DecoratedType? returnType; - - /// If `this` is a function type, the [DecoratedType] of each of its - /// positional parameters (including both required and optional positional - /// parameters). - final List? positionalParameters; - - /// If `this` is a function type, the [DecoratedType] of each of its named - /// parameters. - final Map? namedParameters; - - /// If `this` is a parameterized type, the [DecoratedType] of each of its - /// type parameters. - /// - /// TODO(paulberry): how should we handle generic typedefs? - final List typeArguments; - - DecoratedType(this.type, this.node, - {this.returnType, - this.positionalParameters = const [], - this.namedParameters = const {}, - this.typeArguments = const []}) { - assert(() { - var type = this.type; - if (type is InterfaceType) { - assert(returnType == null); - assert(positionalParameters!.isEmpty); - assert(namedParameters!.isEmpty); - assert(typeArguments.length == type.typeArguments.length); - for (int i = 0; i < typeArguments.length; i++) { - assert(typeArguments[i]!.type == type.typeArguments[i], - '${typeArguments[i]!.type} != ${type.typeArguments[i]}'); - } - } else if (type is FunctionType) { - assert(returnType!.type == type.returnType); - int positionalParameterCount = 0; - int namedParameterCount = 0; - for (var parameter in type.parameters) { - if (parameter.isNamed) { - assert(namedParameters![parameter.name]!.type == parameter.type); - namedParameterCount++; - } else { - assert(positionalParameters![positionalParameterCount].type == - parameter.type); - positionalParameterCount++; - } - } - assert(positionalParameters!.length == positionalParameterCount); - assert(namedParameters!.length == namedParameterCount); - assert(typeArguments.isEmpty); - } else if (node is TypeParameterType) { - assert(returnType == null); - assert(positionalParameters!.isEmpty); - assert(namedParameters!.isEmpty); - assert(typeArguments.isEmpty); - } else { - assert(returnType == null); - assert(positionalParameters!.isEmpty); - assert(namedParameters!.isEmpty); - assert(typeArguments.isEmpty); - } - return true; - }()); - } - - /// Creates a decorated type corresponding to [type], with fresh nullability - /// nodes everywhere that don't correspond to any source location. These - /// nodes can later be unioned with other nodes. - factory DecoratedType.forImplicitFunction( - TypeProvider typeProvider, - FunctionType type, - NullabilityNode node, - NullabilityGraph graph, - NullabilityNodeTarget target, - {DecoratedType? returnType}) { - var positionalParameters = []; - var namedParameters = {}; - int index = 0; - for (var parameter in type.parameters) { - if (parameter.isPositional) { - positionalParameters.add(DecoratedType.forImplicitType(typeProvider, - parameter.type, graph, target.positionalParameter(index++))); - } else { - var name = parameter.name; - namedParameters[name] = DecoratedType.forImplicitType( - typeProvider, parameter.type, graph, target.namedParameter(name)); - } - } - for (var element in type.typeFormals) { - if (DecoratedTypeParameterBounds.current!.get(element) == null) { - DecoratedTypeParameterBounds.current!.put( - element, - DecoratedType.forImplicitType( - typeProvider, - element.bound ?? typeProvider.objectType, - graph, - target.typeFormalBound(element.name))); - } - } - return DecoratedType(type, node, - returnType: returnType ?? - DecoratedType.forImplicitType( - typeProvider, type.returnType, graph, target.returnType()), - namedParameters: namedParameters, - positionalParameters: positionalParameters); - } - - /// Creates a DecoratedType corresponding to [type], with fresh nullability - /// nodes everywhere that don't correspond to any source location. These - /// nodes can later be unioned with other nodes. - factory DecoratedType.forImplicitType(TypeProvider typeProvider, - DartType? type, NullabilityGraph graph, NullabilityNodeTarget target, - {List? typeArguments}) { - var nullabilityNode = NullabilityNode.forInferredType(target); - if (type is InterfaceType) { - assert(() { - if (typeArguments != null) { - assert(typeArguments.length == type.typeArguments.length); - for (var i = 0; i < typeArguments.length; ++i) { - assert(typeArguments[i]!.type == type.typeArguments[i]); - } - } - return true; - }()); - - int index = 0; - typeArguments ??= type.typeArguments - .map((t) => DecoratedType.forImplicitType( - typeProvider, t, graph, target.typeArgument(index++))) - .toList(); - return DecoratedType(type, nullabilityNode, typeArguments: typeArguments); - } else if (type is FunctionType) { - if (typeArguments != null) { - throw 'Not supported: implicit function type with explicit type ' - 'arguments'; - } - return DecoratedType.forImplicitFunction( - typeProvider, type, nullabilityNode, graph, target); - } else { - assert(typeArguments == null); - return DecoratedType(type, nullabilityNode); - } - } - - /// If `this` represents an interface type, returns the substitution necessary - /// to produce this type using the class's type as a starting point. - /// Otherwise throws an exception. - /// - /// For instance, if `this` represents `List`, returns the substitution - /// `{T: int?1}`, where `T` is the [TypeParameterElement] for `List`'s type - /// parameter. - Map get asSubstitution { - var type = this.type; - if (type is InterfaceType) { - return { - for (int i = 0; i < typeArguments.length; i++) - type.element.typeParameters[i]: typeArguments[i]! - }; - } else { - throw StateError( - 'Tried to convert a non-interface type to a substitution'); - } - } - - /// If this type is a function type, returns its generic formal parameters. - /// Otherwise returns `null`. - List? get typeFormals { - var type = this.type; - if (type is FunctionType) { - return type.typeFormals; - } else { - return null; - } - } - - @override - // TODO(srawlins): Override `hashCode` in this class. It should be based on - // [node] and [type], but there is more logic, as seen below in the use of - // [RenamedDecoratedFunctionTypes.match]. - // ignore: hash_and_equals - bool operator ==(Object other) { - if (other is DecoratedType) { - if (!identical(node, other.node)) return false; - var thisType = type; - var otherType = other.type; - if (thisType is FunctionType && otherType is FunctionType) { - if (thisType.normalParameterTypes.length != - otherType.normalParameterTypes.length) { - return false; - } - if (thisType.typeFormals.length != otherType.typeFormals.length) { - return false; - } - var renamed = RenamedDecoratedFunctionTypes.match( - this, other, (bound1, bound2) => bound1 == bound2); - if (renamed == null) return false; - if (renamed.returnType1 != renamed.returnType2) return false; - if (!_compareLists( - renamed.positionalParameters1, renamed.positionalParameters2)) { - return false; - } - if (!_compareMaps(renamed.namedParameters1, renamed.namedParameters2)) { - return false; - } - return true; - } else if (thisType is InterfaceType && otherType is InterfaceType) { - if (thisType.element != otherType.element) return false; - if (!_compareLists(typeArguments, other.typeArguments)) { - return false; - } - return true; - } else { - return thisType == otherType; - } - } - return false; - } - - /// Converts one function type into another by substituting the given - /// [argumentTypes] for the function's generic parameters. - DecoratedType instantiate(List argumentTypes) { - var type = this.type as FunctionType; - var typeFormals = type.typeFormals; - assert(argumentTypes.length == typeFormals.length); - List undecoratedArgumentTypes = []; - Map substitution = {}; - for (int i = 0; i < argumentTypes.length; i++) { - var argumentType = argumentTypes[i]; - undecoratedArgumentTypes.add(argumentType.type!); - substitution[typeFormals[i]] = argumentType; - } - return _substituteFunctionAfterFormals( - type.instantiate(undecoratedArgumentTypes), substitution); - } - - @override - DecoratedTypeInfo? namedParameter(String name) => namedParameters![name]; - - @override - DecoratedTypeInfo? positionalParameter(int i) => positionalParameters![i]; - - /// Updates the [roles] map with information about the nullability nodes - /// pointed to by this decorated type. - /// - /// Each entry stored in [roles] maps the role of the node to the node itself. - /// Roles look like pathnames, where each path component is an integer to - /// represent a type argument (or a positional parameter type, in the case of - /// a function type), an name to represent a named parameter type, or `@r` to - /// represent a return type. - void recordRoles(Map roles, - {String rolePrefix = ''}) { - roles[rolePrefix] = node; - returnType?.recordRoles(roles, rolePrefix: '$rolePrefix/@r'); - for (int i = 0; i < positionalParameters!.length; i++) { - positionalParameters![i].recordRoles(roles, rolePrefix: '$rolePrefix/$i'); - } - for (var entry in namedParameters!.entries) { - entry.value.recordRoles(roles, rolePrefix: '$rolePrefix/${entry.key}'); - } - for (int i = 0; i < typeArguments.length; i++) { - typeArguments[i]!.recordRoles(roles, rolePrefix: '$rolePrefix/$i'); - } - } - - /// Apply the given [substitution] to this type. - /// - /// [undecoratedResult] is the result of the substitution, as determined by - /// the normal type system. If not supplied, it is inferred. - DecoratedType substitute( - Map substitution, - [DartType? undecoratedResult]) { - if (substitution.isEmpty) return this; - if (undecoratedResult == null) { - var type = this.type!; - undecoratedResult = Substitution.fromPairs( - substitution.keys.toList(), - substitution.values.map((d) => d.type!).toList(), - ).substituteType(type); - if (undecoratedResult is FunctionType && type is FunctionType) { - for (int i = 0; i < undecoratedResult.typeFormals.length; i++) { - DecoratedTypeParameterBounds.current!.put( - undecoratedResult.typeFormals[i], - DecoratedTypeParameterBounds.current!.get(type.typeFormals[i])); - } - } - } - return _substitute(substitution, undecoratedResult); - } - - @override - String toString() { - var trailing = node.debugSuffix; - var type = this.type; - if (type is TypeParameterType || type is VoidType) { - return '$type$trailing'; - } else if (type is InterfaceType) { - var name = type.element.name; - var args = ''; - if (type.typeArguments.isNotEmpty) { - args = '<${typeArguments.join(', ')}>'; - } - return '$name$args$trailing'; - } else if (type is FunctionType) { - String formals = ''; - if (type.typeFormals.isNotEmpty) { - formals = '<${type.typeFormals.join(', ')}>'; - } - List paramStrings = []; - for (int i = 0; i < positionalParameters!.length; i++) { - var prefix = ''; - if (i == type.normalParameterTypes.length) { - prefix = '['; - } - paramStrings.add('$prefix${positionalParameters![i]}'); - } - if (type.normalParameterTypes.length < positionalParameters!.length) { - paramStrings.last += ']'; - } - if (namedParameters!.isNotEmpty) { - var prefix = '{'; - for (var entry in namedParameters!.entries) { - paramStrings.add('$prefix${entry.key}: ${entry.value}'); - prefix = ''; - } - paramStrings.last += '}'; - } - var args = paramStrings.join(', '); - return '$returnType Function$formals($args)$trailing'; - } else if (type is DynamicTypeImpl) { - return 'dynamic'; - } else if (type!.isBottom) { - return 'Never$trailing'; - } else { - throw '$type'; // TODO(paulberry) - } - } - - @override - DecoratedTypeInfo? typeArgument(int i) => typeArguments[i]; - - /// Creates a shallow copy of `this`, replacing the nullability node. - DecoratedType withNode(NullabilityNode node) => DecoratedType(type, node, - returnType: returnType, - positionalParameters: positionalParameters, - namedParameters: namedParameters, - typeArguments: typeArguments); - - /// Creates a shallow copy of `this`, replacing the nullability node and the - /// type. - DecoratedType withNodeAndType(NullabilityNode node, DartType? type) => - DecoratedType(type, node, - returnType: returnType, - positionalParameters: positionalParameters, - namedParameters: namedParameters, - typeArguments: typeArguments); - - @override - DecoratedType _performSubstitution( - DecoratedType other, DartType undecoratedResult) => - withNodeAndType( - NullabilityNode.forSubstitution(node, other.node), undecoratedResult); - - /// Internal implementation of [_substitute], used as a recursion target. - DecoratedType _substitute( - Map substitution, - DartType? undecoratedResult) { - var type = this.type; - if (type is FunctionType && undecoratedResult is FunctionType) { - var typeFormals = type.typeFormals; - assert(typeFormals.length == undecoratedResult.typeFormals.length); - if (typeFormals.isNotEmpty) { - // The analyzer sometimes allocates fresh type variables when performing - // substitutions, so we need to reflect that in our decorations by - // substituting to use the type variables the analyzer used. - substitution = - Map.from(substitution); - for (int i = 0; i < typeFormals.length; i++) { - // Check if it's a fresh type variable. - if (undecoratedResult.typeFormals[i].enclosingElement == null) { - substitution[typeFormals[i]] = - _TypeVariableReplacement(undecoratedResult.typeFormals[i]); - } - } - for (int i = 0; i < typeFormals.length; i++) { - var typeFormal = typeFormals[i]; - var oldDecoratedBound = - DecoratedTypeParameterBounds.current!.get(typeFormal); - var undecoratedResult2 = undecoratedResult.typeFormals[i].bound; - if (undecoratedResult2 == null) { - if (oldDecoratedBound == null) { - assert( - false, 'Could not find old decorated bound for type formal'); - // Recover the best we can by assuming a bound of `dynamic`. - oldDecoratedBound = DecoratedType( - DynamicTypeImpl.instance, - NullabilityNode.forInferredType( - NullabilityNodeTarget.text('Type parameter bound'))); - } - undecoratedResult2 = oldDecoratedBound.type; - } - var newDecoratedBound = - oldDecoratedBound!._substitute(substitution, undecoratedResult2); - if (identical(typeFormal, undecoratedResult.typeFormals[i])) { - assert(oldDecoratedBound == newDecoratedBound); - } else { - DecoratedTypeParameterBounds.current! - .put(undecoratedResult.typeFormals[i], newDecoratedBound); - } - } - } - return _substituteFunctionAfterFormals(undecoratedResult, substitution); - } else if (type is InterfaceType && undecoratedResult is InterfaceType) { - List newTypeArguments = []; - for (int i = 0; i < typeArguments.length; i++) { - newTypeArguments.add(typeArguments[i]! - .substitute(substitution, undecoratedResult.typeArguments[i])); - } - return DecoratedType(undecoratedResult, node, - typeArguments: newTypeArguments); - } else if (type is TypeParameterType) { - var inner = substitution[type.element]; - if (inner == null) { - return this; - } else { - return inner._performSubstitution(this, undecoratedResult!); - } - } else if (type is VoidType || type is DynamicType) { - return this; - } - throw '$type.substitute($type | $substitution)'; // TODO(paulberry) - } - - /// Performs the logic that is common to substitution and function type - /// instantiation. Namely, a decorated type is formed whose undecorated type - /// is [undecoratedResult], and whose return type, positional parameters, and - /// named parameters are formed by performing the given [substitution]. - DecoratedType _substituteFunctionAfterFormals(FunctionType undecoratedResult, - Map substitution) { - var newPositionalParameters = []; - var numRequiredParameters = undecoratedResult.normalParameterTypes.length; - for (int i = 0; i < positionalParameters!.length; i++) { - var undecoratedParameterType = i < numRequiredParameters - ? undecoratedResult.normalParameterTypes[i] - : undecoratedResult.optionalParameterTypes[i - numRequiredParameters]; - newPositionalParameters.add(positionalParameters![i] - ._substitute(substitution, undecoratedParameterType)); - } - var newNamedParameters = {}; - for (var entry in namedParameters!.entries) { - var name = entry.key; - var undecoratedParameterType = - undecoratedResult.namedParameterTypes[name]; - newNamedParameters[name] = - entry.value._substitute(substitution, undecoratedParameterType); - } - return DecoratedType(undecoratedResult, node, - returnType: - returnType!._substitute(substitution, undecoratedResult.returnType), - positionalParameters: newPositionalParameters, - namedParameters: newNamedParameters); - } - - static bool _compareLists( - List? list1, List? list2) { - if (identical(list1, list2)) return true; - if (list1!.length != list2!.length) return false; - for (int i = 0; i < list1.length; i++) { - if (list1[i] != list2[i]) return false; - } - return true; - } - - static bool _compareMaps( - Map? map1, Map? map2) { - if (identical(map1, map2)) return true; - if (map1!.length != map2!.length) return false; - for (var entry in map1.entries) { - if (entry.value != map2[entry.key]) return false; - } - return true; - } -} - -/// Data structure mapping type parameters to their decorated bounds. -/// -/// Since we need to be able to access this mapping globally throughout the -/// migration engine, from places where we can't easily inject it, the current -/// mapping is stored in a static variable. -class DecoratedTypeParameterBounds { - /// The [DecoratedTypeParameterBounds] currently in use, or `null` if we are - /// not currently in a stage of migration where we need access to the - /// decorated types of type parameter bounds. - /// - /// If `null`, then attempts to look up the decorated types of type parameter - /// bounds will fail. - static DecoratedTypeParameterBounds? current; - - final _orphanBounds = Expando(); - - final _parentedBounds = {}; - - DecoratedType? get(TypeParameterElement element) { - if (element.enclosingElement == null) { - return _orphanBounds[element]; - } else { - return _parentedBounds[element]; - } - } - - void put(TypeParameterElement element, DecoratedType? bounds) { - if (element.enclosingElement == null) { - _orphanBounds[element] = bounds; - } else { - _parentedBounds[element] = bounds; - } - } -} - -/// Helper class that renames the type parameters in two decorated function -/// types so that they match. -class RenamedDecoratedFunctionTypes { - final DecoratedType? returnType1; - - final DecoratedType? returnType2; - - final List? positionalParameters1; - - final List? positionalParameters2; - - final Map? namedParameters1; - - final Map? namedParameters2; - - RenamedDecoratedFunctionTypes._( - this.returnType1, - this.returnType2, - this.positionalParameters1, - this.positionalParameters2, - this.namedParameters1, - this.namedParameters2); - - /// Attempt to find a renaming of the type parameters of [type1] and [type2] - /// (both of which should be function types) such that the generic type - /// parameters match. - /// - /// The callback [boundsMatcher] is used to determine whether type parameter - /// bounds match. - /// - /// If such a renaming can be found, it is returned. If not, `null` is - /// returned. - static RenamedDecoratedFunctionTypes? match( - DecoratedType type1, - DecoratedType type2, - bool Function(DecoratedType, DecoratedType) boundsMatcher) { - if (!_isNeeded(type1.typeFormals, type2.typeFormals)) { - return RenamedDecoratedFunctionTypes._( - type1.returnType, - type2.returnType, - type1.positionalParameters, - type2.positionalParameters, - type1.namedParameters, - type2.namedParameters); - } - // Create a fresh set of type variables and substitute so we can - // compare safely. - var substitution1 = {}; - var substitution2 = {}; - var newParameters = []; - for (int i = 0; i < type1.typeFormals!.length; i++) { - var newParameter = - TypeParameterElementImpl.synthetic(type1.typeFormals![i].name); - newParameters.add(newParameter); - var newType = _TypeVariableReplacement(newParameter); - substitution1[type1.typeFormals![i]] = newType; - substitution2[type2.typeFormals![i]] = newType; - } - for (int i = 0; i < type1.typeFormals!.length; i++) { - var bound1 = DecoratedTypeParameterBounds.current! - .get((type1.type as FunctionType).typeFormals[i])! - .substitute(substitution1); - var bound2 = DecoratedTypeParameterBounds.current! - .get((type2.type as FunctionType).typeFormals[i])! - .substitute(substitution2); - if (!boundsMatcher(bound1, bound2)) return null; - DecoratedTypeParameterBounds.current!.put(newParameters[i], bound1); - } - var returnType1 = type1.returnType!.substitute(substitution1); - var returnType2 = type2.returnType!.substitute(substitution2); - var positionalParameters1 = - _substituteList(type1.positionalParameters!, substitution1); - var positionalParameters2 = - _substituteList(type2.positionalParameters!, substitution2); - var namedParameters1 = - _substituteMap(type1.namedParameters!, substitution1); - var namedParameters2 = - _substituteMap(type2.namedParameters!, substitution2); - return RenamedDecoratedFunctionTypes._( - returnType1, - returnType2, - positionalParameters1, - positionalParameters2, - namedParameters1, - namedParameters2); - } - - static bool _isNeeded(List? formals1, - List? formals2) { - if (identical(formals1, formals2)) return false; - if (formals1!.length != formals2!.length) return true; - for (int i = 0; i < formals1.length; i++) { - if (!identical(formals1[i], formals2[i])) return true; - } - return false; - } - - static List _substituteList(List list, - Map substitution) { - return list.map((t) => t!.substitute(substitution)).toList(); - } - - static Map _substituteMap( - Map map, - Map substitution) { - var result = {}; - for (var entry in map.entries) { - result[entry.key] = entry.value!.substitute(substitution); - } - return result; - } -} - -/// Abstract base class for anything that can appear in the "value" position of -/// a decorated type substitution map (in other words, anything that a type -/// variable can be replaced with when performing a substitution). A -/// substituted type is either a [DecoratedType] (in which case the substitution -/// will be fully general, and the resulting decorated type will have a -/// nullability that's based on both the original type and the substituted -/// type), or it can be a [_TypeVariableReplacement], which is used when one -/// type variable is being replaced with another, but there is no change in -/// nullability. -abstract class SubstitutedType { - /// The undecorated type to be substituted - DartType? get type; - - /// Called by substitute methods to perform the actual substitution. [other] - /// is the decorated type to be substituted, and [undecoratedResult] is the - /// expected undecorated result of the substitution. - DecoratedType _performSubstitution( - DecoratedType other, DartType undecoratedResult); -} - -/// Data structure used as a value in a substitution map if the only -/// substitution that needs to be performed is to replace one type variable with -/// another. -class _TypeVariableReplacement implements SubstitutedType { - @override - final DartType type; - - _TypeVariableReplacement(TypeParameterElement newTypeVariable) - : type = TypeParameterTypeImpl( - element: newTypeVariable, - nullabilitySuffix: NullabilitySuffix.star, - ); - - @override - DecoratedType _performSubstitution( - DecoratedType other, DartType undecoratedResult) => - other.withNodeAndType(other.node, undecoratedResult); -} diff --git a/pkg/nnbd_migration/lib/src/decorated_type_operations.dart b/pkg/nnbd_migration/lib/src/decorated_type_operations.dart deleted file mode 100644 index 356d86ceb6ca..000000000000 --- a/pkg/nnbd_migration/lib/src/decorated_type_operations.dart +++ /dev/null @@ -1,254 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:_fe_analyzer_shared/src/field_promotability.dart'; -import 'package:_fe_analyzer_shared/src/flow_analysis/flow_analysis.dart'; -import 'package:_fe_analyzer_shared/src/type_inference/type_operations.dart'; -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/dart/element/type.dart'; -import 'package:analyzer/dart/element/type_provider.dart'; -import 'package:analyzer/dart/element/type_system.dart'; -import 'package:nnbd_migration/src/decorated_type.dart'; -import 'package:nnbd_migration/src/edge_origin.dart'; -import 'package:nnbd_migration/src/nullability_node.dart'; -import 'package:nnbd_migration/src/variables.dart'; - -/// [Operations] that works with [DecoratedType]s. -class DecoratedTypeOperations - implements Operations { - final TypeSystem _typeSystem; - final TypeProvider _typeProvider; - final Variables? _variableRepository; - final NullabilityGraph _graph; - - @override - late final DecoratedType boolType = - DecoratedType(_typeProvider.boolType, _graph.never); - - DecoratedTypeOperations(this._typeSystem, this._typeProvider, - this._variableRepository, this._graph); - - @override - bool areStructurallyEqual(DecoratedType type1, DecoratedType type2) { - // TODO(scheglov): implement areStructurallyEqual - throw UnimplementedError('TODO(scheglov)'); - } - - @override - TypeClassification classifyType(DecoratedType type) { - if (type.type!.isDartCoreNull) { - return TypeClassification.nullOrEquivalent; - } else { - return TypeClassification.potentiallyNullable; - } - } - - @override - DecoratedType factor(DecoratedType from, DecoratedType what) { - // TODO(scheglov): https://github.com/dart-lang/sdk/issues/41672 - return from; - } - - @override - bool forcePromotion( - DecoratedType to, - DecoratedType from, - List? promotedTypes, - List? newPromotedTypes) { - // Do not force promotion if it appears that the element's type was just - // demoted. - if (promotedTypes != null && - (newPromotedTypes == null || - newPromotedTypes.length < promotedTypes.length)) { - return false; - } - if (!isSubtypeOf(to, from)) { - return false; - } - var fromSources = from.node.upstreamEdges; - // Do not force promotion if [to] already points to [from]. - if (fromSources.length == 1 && fromSources.single.sourceNode == to.node) { - return false; - } - return true; - } - - @override - DecoratedType glb(DecoratedType type1, DecoratedType type2) { - // TODO: implement glb - throw UnimplementedError(); - } - - @override - bool isAssignableTo(DecoratedType fromType, DecoratedType toType) { - // TODO: implement isAssignableTo - throw UnimplementedError(); - } - - @override - bool isDynamic(DecoratedType type) { - return type is DynamicType; - } - - @override - bool isError(DecoratedType type) { - return type is InvalidType; - } - - @override - bool isNever(DecoratedType type) { - return false; - } - - @override - bool isPropertyPromotable(Object property) { - // TODO(paulberry): research whether we would get higher quality migrations - // if we returned `true` instead. - return false; - } - - @override - bool isSameType(DecoratedType type1, DecoratedType type2) { - return type1 == type2; - } - - @override - bool isSubtypeOf(DecoratedType leftType, DecoratedType rightType) { - if (!_typeSystem.isSubtypeOf(leftType.type!, rightType.type!)) { - // Pre-migrated types don't meet the subtype requirement. Not a subtype. - return false; - } else if (rightType.node == _graph.never && - leftType.node != _graph.never) { - // The "never" node will never be nullable, so not a subtype. - return false; - } else { - // We don't know whether a subtype relation will hold once the graph is - // solved. Assume it will. - return true; - } - } - - @override - bool isTypeParameterType(DecoratedType type) => - type.type is TypeParameterType; - - @override - DecoratedType lub(DecoratedType type1, DecoratedType type2) { - // TODO: implement lub - throw UnimplementedError(); - } - - @override - DecoratedType makeNullable(DecoratedType type) { - // TODO: implement makeNullable - throw UnimplementedError(); - } - - @override - DecoratedType? matchIterableType(DecoratedType type) { - // TODO: implement matchIterableType - throw UnimplementedError(); - } - - @override - DecoratedType? matchListType(DecoratedType type) { - // TODO: implement matchListType - throw UnimplementedError(); - } - - @override - MapPatternTypeArguments? matchMapType(DecoratedType type) { - // TODO: implement matchMapType - throw UnimplementedError(); - } - - @override - DecoratedType? matchStreamType(DecoratedType type) { - // TODO: implement matchStreamType - throw UnimplementedError(); - } - - @override - DecoratedType normalize(DecoratedType type) { - // TODO(scheglov): implement normalize - throw UnimplementedError('TODO(scheglov)'); - } - - @override - DecoratedType promoteToNonNull(DecoratedType type) { - return type.withNode(_graph.never); - } - - @override - // This function walks [chain1] and [chain2], creating an intersection similar - // to that of [VariableModel.joinPromotedTypes]. - List? refinePromotedTypes(List? chain1, - List? chain2, List? promotedTypes) { - if (chain1 == null || chain2 == null) return promotedTypes; - - // This method can only handle very simple joins. - if (chain1.length != chain2.length) return promotedTypes; - - // The promotion chains were intersected without any promotions being - // dropped. There is nothing to do here. - if (promotedTypes != null && promotedTypes.length == chain1.length) { - return promotedTypes; - } - - var result = []; - int index = 0; - while (index < chain1.length) { - if (!isSameType(chain1[index], chain2[index])) { - break; - } - result.add(chain1[index]); - index++; - } - - if (index != chain1.length - 1) { - // This method can only handle the situation in which the promotion chains - // are identical up to the last node. If we are not in such situation, - // return the previous result. - return promotedTypes; - } - - DecoratedType firstType = chain1[index]; - DecoratedType secondType = chain2[index]; - - var node = NullabilityNode.forGLB(); - var origin = - // TODO(srawlins): How to get the source or astNode from within here... - GreatestLowerBoundOrigin(null /* source */, null /* astNode */); - _graph.connect(firstType.node, node, origin, guards: [secondType.node]); - _graph.connect(node, firstType.node, origin); - _graph.connect(node, secondType.node, origin); - - return result..add(firstType.withNode(node)); - } - - @override - DecoratedType? tryPromoteToType(DecoratedType to, DecoratedType from) { - // TODO(paulberry): implement appropriate logic for type variable promotion. - if (isSubtypeOf(to, from)) { - return to; - } - - // Allow promotion from non-null types to other types, preserving non-null. - var keepNonNull = promoteToNonNull(to); - if (isSubtypeOf(keepNonNull, from)) { - return keepNonNull; - } else { - return null; - } - } - - @override - DecoratedType variableType(PromotableElement variable) { - return _variableRepository!.decoratedElementType(variable); - } - - @override - PropertyNonPromotabilityReason? whyPropertyIsNotPromotable(Object property) => - null; -} diff --git a/pkg/nnbd_migration/lib/src/edge_builder.dart b/pkg/nnbd_migration/lib/src/edge_builder.dart deleted file mode 100644 index fcd3625543f6..000000000000 --- a/pkg/nnbd_migration/lib/src/edge_builder.dart +++ /dev/null @@ -1,4148 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:_fe_analyzer_shared/src/flow_analysis/flow_analysis.dart'; -import 'package:_fe_analyzer_shared/src/type_inference/assigned_variables.dart'; -import 'package:analyzer/dart/ast/token.dart'; -import 'package:analyzer/dart/ast/visitor.dart'; -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/dart/element/nullability_suffix.dart'; -import 'package:analyzer/dart/element/type.dart'; -import 'package:analyzer/dart/element/type_provider.dart'; -import 'package:analyzer/dart/element/type_system.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:analyzer/src/dart/ast/ast.dart'; -import 'package:analyzer/src/dart/element/element.dart'; -import 'package:analyzer/src/dart/element/inheritance_manager3.dart'; -import 'package:analyzer/src/dart/element/member.dart'; -import 'package:analyzer/src/dart/element/type.dart'; -import 'package:analyzer/src/dart/element/type_system.dart' show TypeSystemImpl; -import 'package:analyzer/src/dart/resolver/flow_analysis_visitor.dart'; -import 'package:analyzer/src/error/best_practices_verifier.dart'; -import 'package:meta/meta.dart'; -import 'package:nnbd_migration/fix_reason_target.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; -import 'package:nnbd_migration/src/conditional_discard.dart'; -import 'package:nnbd_migration/src/decorated_class_hierarchy.dart'; -import 'package:nnbd_migration/src/decorated_type.dart'; -import 'package:nnbd_migration/src/edge_origin.dart'; -import 'package:nnbd_migration/src/expression_checks.dart'; -import 'package:nnbd_migration/src/nullability_node.dart'; -import 'package:nnbd_migration/src/nullability_node_target.dart'; -import 'package:nnbd_migration/src/utilities/built_value_transformer.dart'; -import 'package:nnbd_migration/src/utilities/completeness_tracker.dart'; -import 'package:nnbd_migration/src/utilities/hint_utils.dart'; -import 'package:nnbd_migration/src/utilities/permissive_mode.dart'; -import 'package:nnbd_migration/src/utilities/resolution_utils.dart'; -import 'package:nnbd_migration/src/utilities/scoped_set.dart'; -import 'package:nnbd_migration/src/utilities/where_not_null_transformer.dart'; -import 'package:nnbd_migration/src/utilities/where_or_null_transformer.dart'; -import 'package:nnbd_migration/src/variables.dart'; - -import 'decorated_type_operations.dart'; - -/// A potentially reversible decision is that downcasts and sidecasts should -/// assume non-nullability. This could be changed such that we assume the -/// widest type, or the narrowest type. For now we assume non-nullability, but -/// have a flag to isolate that work. -const _assumeNonNullabilityInCasts = true; - -/// Test class mixing in _AssignmentChecker, to allow [checkAssignment] to be -/// more easily unit tested. -@visibleForTesting -class AssignmentCheckerForTesting extends Object with _AssignmentChecker { - @override - final TypeSystem _typeSystem; - - @override - final TypeProvider typeProvider; - - final NullabilityGraph _graph; - - /// Tests should fill in this map with the bounds of any type parameters being - /// tested. - final Map bounds = {}; - - @override - final DecoratedClassHierarchy _decoratedClassHierarchy; - - AssignmentCheckerForTesting(this._typeSystem, this.typeProvider, this._graph, - this._decoratedClassHierarchy); - - void checkAssignment(EdgeOrigin origin, - {required DecoratedType source, - required DecoratedType destination, - required bool hard}) { - super._checkAssignment(origin, FixReasonTarget.root, - source: source, destination: destination, hard: hard); - } - - @override - void _connect(NullabilityNode? source, NullabilityNode? destination, - EdgeOrigin origin, FixReasonTarget edgeTarget, - {bool hard = false, bool checkable = true}) { - _graph.connect(source, destination!, origin, - hard: hard, checkable: checkable); - } - - @override - DecoratedType? _getCallMethodType(DecoratedType type) => null; - - @override - DecoratedType _getTypeParameterTypeBound(DecoratedType type) { - return bounds[(type.type as TypeParameterType).element] ?? - (throw StateError('Unknown bound for $type')); - } -} - -/// Visitor that builds nullability graph edges by examining code to be -/// migrated. -/// -/// The return type of each `visit...` method is a [DecoratedType] indicating -/// the static type of the visited expression, along with the constraint -/// variables that will determine its nullability. For `visit...` methods that -/// don't visit expressions, `null` will be returned. -class EdgeBuilder extends GeneralizingAstVisitor - with - _AssignmentChecker, - PermissiveModeVisitor, - CompletenessTracker, - ResolutionUtils { - final TypeSystem _typeSystem; - - final InheritanceManager3 _inheritanceManager; - - /// The repository of constraint variables and decorated types (from a - /// previous pass over the source code). - final Variables _variables; - - final NullabilityMigrationListener? listener; - - final NullabilityMigrationInstrumentation? instrumentation; - - final NullabilityGraph _graph; - - TypeProvider typeProvider; - - @override - final Source? source; - - @override - final DecoratedClassHierarchy? _decoratedClassHierarchy; - - /// If we are visiting a function body or initializer, instance of flow - /// analysis. Otherwise `null`. - FlowAnalysis? _flowAnalysis; - - /// If we are visiting a function body or initializer, assigned variable - /// information used in flow analysis. Otherwise `null`. - AssignedVariables? _assignedVariables; - - /// The outermost function or method being visited, or `null` if the visitor - /// is not inside any function or method. - ExecutableElement? _currentExecutable; - - /// The [DecoratedType] of the innermost function or method being visited, or - /// `null` if the visitor is not inside any function or method. - /// - /// This is needed to construct the appropriate nullability constraints for - /// return statements. - DecoratedType? _currentFunctionType; - - /// If the innermost enclosing executable is a constructor with field formal - /// parameters, a map from each field's getter to the corresponding field - /// formal parameter element. Otherwise, an empty map. - Map - _currentFieldFormals = const {}; - - FunctionExpression? _currentFunctionExpression; - - /// The [InterfaceElement] or [ExtensionElement] of the current interface - /// or extension being visited, or null. - Element? _currentInterfaceOrExtension; - - /// If an extension declaration is being visited, the decorated type of the - /// type appearing in the `on` clause (this is the type of `this` inside the - /// extension declaration). Null if an extension declaration is not being - /// visited. - DecoratedType? _currentExtendedType; - - /// The [DecoratedType] of the innermost list or set literal being visited, or - /// `null` if the visitor is not inside any list or set. - /// - /// This is needed to construct the appropriate nullability constraints for - /// ui as code elements. - DecoratedType? _currentLiteralElementType; - - /// The key [DecoratedType] of the innermost map literal being visited, or - /// `null` if the visitor is not inside any map. - /// - /// This is needed to construct the appropriate nullability constraints for - /// ui as code elements. - DecoratedType? _currentMapKeyType; - - /// The value [DecoratedType] of the innermost map literal being visited, or - /// `null` if the visitor is not inside any map. - /// - /// This is needed to construct the appropriate nullability constraints for - /// ui as code elements. - DecoratedType? _currentMapValueType; - - /// Information about the most recently visited binary expression whose - /// boolean value could possibly affect nullability analysis. - _ConditionInfo? _conditionInfo; - - /// The set of nullability nodes that would have to be `nullable` for the code - /// currently being visited to be reachable. - /// - /// Guard variables are attached to the left hand side of any generated - /// constraints, so that constraints do not take effect if they come from - /// code that can be proven unreachable by the migration tool. - final _guards = []; - - /// The scope of locals (parameters, variables) that are post-dominated by the - /// current node as we walk the AST. We use a [_ScopedLocalSet] so that outer - /// scopes may track their post-dominators separately from inner scopes. - /// - /// Note that this is not guaranteed to be complete. It is used to make hard - /// edges on a best-effort basis. - var _postDominatedLocals = ScopedSet(); - - /// Map whose keys are expressions of the form `a?.b` on the LHS of - /// assignments, and whose values are the nullability nodes corresponding to - /// the expression preceding `?.`. These are needed in order to properly - /// analyze expressions like `a?.b += c`, since the type of the compound - /// assignment is nullable if the type of the expression preceding `?.` is - /// nullable. - final Map _conditionalNodes = {}; - - /// If we are visiting a cascade expression, the decorated type of the target - /// of the cascade. Otherwise `null`. - DecoratedType? _currentCascadeTargetType; - - /// While visiting a class declaration, set of class fields that lack - /// initializers at their declaration sites. - Set? _fieldsNotInitializedAtDeclaration; - - /// While visiting a constructor, set of class fields that lack initializers - /// at their declaration sites *and* for which we haven't yet found an - /// initializer in the constructor declaration. - Set? _fieldsNotInitializedByConstructor; - - /// Current nesting depth of [visitNamedType] - int _typeNameNesting = 0; - - final Set _lateHintedLocals = {}; - - final Map _nullCheckHints = {}; - - /// Helper that assists us in transforming Iterable methods to their "OrNull" - /// equivalents. - final WhereOrNullTransformer _whereOrNullTransformer; - - /// Helper that assists us in transforming calls to `Iterable.where` to - /// `Iterable.whereNotNull`. - final WhereNotNullTransformer _whereNotNullTransformer; - - /// Deferred processing that should be performed once we have finished - /// evaluating the decorated type of a method invocation. - final Map - _deferredMethodInvocationProcessing = {}; - - /// If we are visiting a local function or closure, the set of local variables - /// assigned to so far inside it. Otherwise `null`. - Set? _elementsWrittenToInLocalFunction; - - final LibraryElement _library; - - EdgeBuilder(this.typeProvider, this._typeSystem, this._variables, this._graph, - this.source, this.listener, this._decoratedClassHierarchy, this._library, - {this.instrumentation}) - : _inheritanceManager = InheritanceManager3(), - _whereOrNullTransformer = - WhereOrNullTransformer(typeProvider, _typeSystem), - _whereNotNullTransformer = - WhereNotNullTransformer(typeProvider, _typeSystem); - - /// The synthetic element we use as a stand-in for `this` when analyzing - /// extension methods. - Element get _extensionThis => DynamicElementImpl.instance; - - /// Gets the decorated type of [element] from [_variables], performing any - /// necessary substitutions. - /// - /// [node] is used as the AST node for the edge origin if any graph edges need - /// to be created. [targetType], if provided, indicates the type of the - /// target (receiver) for a method, getter, or setter invocation. - /// [targetExpression], if provided, is the expression for the target - /// (receiver) for a method, getter, or setter invocation. - DecoratedType getOrComputeElementType(AstNode node, Element element, - {DecoratedType? targetType, - Expression? targetExpression, - bool isNullAware = false}) { - Map? substitution; - Element? baseElement = element.declaration; - if (targetType != null) { - var enclosingElement = baseElement!.enclosingElement; - if (enclosingElement is InterfaceElement) { - if (targetType.type.explicitBound is InterfaceType && - enclosingElement.typeParameters.isNotEmpty) { - substitution = _decoratedClassHierarchy! - .asInstanceOf(targetType, enclosingElement) - .asSubstitution; - } - } else { - assert(enclosingElement is ExtensionElement); - final extensionElement = enclosingElement as ExtensionElement; - // The semantics of calling an extension method or extension property - // are essentially the same as calling a static function where the - // receiver is passed as an invisible `this` parameter whose type is the - // extension's "on" type. If the extension declaration has type - // parameters, they behave like inferred type parameters of the static - // function. - // - // So what we need to do is (1) create a set of DecoratedTypes to - // represent the inferred types of the type parameters, (2) ensure that - // the receiver type is assignable to "on" type (with those decorated - // types substituted into it), and (3) substitute those decorated types - // into the declared type of the extension method or extension property, - // so that the caller will match up parameter types and the return type - // appropriately. - // - // Taking each step in turn: - // (1) create a set of decorated types to represent the inferred types - // of the type parameters. Note that we must make sure each of these - // types satisfies its associated bound. - var typeParameters = extensionElement.typeParameters; - if (typeParameters.isNotEmpty) { - var preMigrationSubstitution = (element as Member).substitution.map; - substitution = {}; - var target = NullabilityNodeTarget.text('extension'); - for (int i = 0; i < typeParameters.length; i++) { - var typeParameter = typeParameters[i]; - var decoratedTypeArgument = DecoratedType.forImplicitType( - typeProvider, - preMigrationSubstitution[typeParameter], - _graph, - target.typeArgument(i)); - substitution[typeParameter] = decoratedTypeArgument; - var edgeOrigin = - InferredTypeParameterInstantiationOrigin(source, node); - _checkAssignment(edgeOrigin, FixReasonTarget.root, - source: decoratedTypeArgument, - destination: - _variables.decoratedTypeParameterBound(typeParameter)!, - hard: true); - } - } - // (2) ensure that the receiver type is assignable to "on" type (with - // those decorated types substituted into it) - var onType = _variables.decoratedElementType(extensionElement); - if (substitution != null) { - onType = onType.substitute(substitution); - } - _checkAssignment(InferredTypeParameterInstantiationOrigin(source, node), - FixReasonTarget.root, - source: targetType, - destination: onType, - hard: !isNullAware && - (targetExpression == null || - _isReferenceInScope(targetExpression))); - // (3) substitute those decorated types into the declared type of the - // extension method or extension property, so that the caller will match - // up parameter types and the return type appropriately. - // - // There's nothing more we need to do here. The substitution below - // will do the job. - } - } - DecoratedType decoratedBaseType; - if (baseElement is PropertyAccessorElement && - baseElement.isSynthetic && - !baseElement.variable.isSynthetic) { - var variable = baseElement.variable; - var decoratedElementType = _variables.decoratedElementType(variable); - if (baseElement.isGetter) { - var target = NullabilityNodeTarget.text('getter function'); - decoratedBaseType = DecoratedType( - baseElement.type, NullabilityNode.forInferredType(target), - returnType: decoratedElementType); - } else { - assert(baseElement.isSetter); - var target = NullabilityNodeTarget.text('setter function'); - decoratedBaseType = DecoratedType( - baseElement.type, NullabilityNode.forInferredType(target), - positionalParameters: [decoratedElementType], - returnType: DecoratedType(VoidTypeImpl.instance, - NullabilityNode.forInferredType(target.returnType()))); - } - } else { - decoratedBaseType = _variables.decoratedElementType(baseElement!); - } - if (substitution != null) { - return decoratedBaseType.substitute(substitution); - } else { - return decoratedBaseType; - } - } - - @override - // TODO(srawlins): Theoretically, edges should be connected between arguments - // and parameters, as in an instance creation. It is quite rare though, to - // declare a class and use it as an annotation in the same package. - DecoratedType? visitAnnotation(Annotation node) { - var previousFlowAnalysis = _flowAnalysis; - var previousAssignedVariables = _assignedVariables; - if (_flowAnalysis == null) { - _assignedVariables = AssignedVariables(); - // Note: we are using flow analysis to help us track true nullabilities; - // it's not necessary to replicate old bugs. So we pass `true` for - // `respectImplicitlyTypedVarInitializers`. - _flowAnalysis = FlowAnalysis( - DecoratedTypeOperations( - _typeSystem, typeProvider, _variables, _graph), - _assignedVariables!, - respectImplicitlyTypedVarInitializers: true, - fieldPromotionEnabled: false); - } - try { - _dispatch(node.constructorName); - _dispatchList(node.arguments?.arguments); - } finally { - _flowAnalysis = previousFlowAnalysis; - _assignedVariables = previousAssignedVariables; - } - annotationVisited(node); - return null; - } - - @override - DecoratedType visitAsExpression(AsExpression node) { - if (BestPracticesVerifier.isUnnecessaryCast( - node, _typeSystem as TypeSystemImpl)) { - _variables.recordUnnecessaryCast(source, node); - } - _dispatch(node.type); - final typeNode = _variables.decoratedTypeAnnotation(source, node.type); - _handleAssignment(node.expression, destinationType: typeNode); - _flowAnalysis!.asExpression_end(node.expression, typeNode); - return typeNode; - } - - @override - DecoratedType? visitAssertInitializer(AssertInitializer node) { - _flowAnalysis!.assert_begin(); - _checkExpressionNotNull(node.condition); - if (identical(_conditionInfo?.condition, node.condition)) { - var intentNode = _conditionInfo!.trueDemonstratesNonNullIntent; - if (intentNode != null && _conditionInfo!.postDominatingIntent!) { - _graph.makeNonNullable(_conditionInfo!.trueDemonstratesNonNullIntent, - NonNullAssertionOrigin(source, node)); - } - } - _flowAnalysis!.assert_afterCondition(node.condition); - _dispatch(node.message); - _flowAnalysis!.assert_end(); - return null; - } - - @override - DecoratedType? visitAssertStatement(AssertStatement node) { - _flowAnalysis!.assert_begin(); - _checkExpressionNotNull(node.condition); - if (identical(_conditionInfo?.condition, node.condition)) { - var intentNode = _conditionInfo!.trueDemonstratesNonNullIntent; - if (intentNode != null && _conditionInfo!.postDominatingIntent!) { - _graph.makeNonNullable(_conditionInfo!.trueDemonstratesNonNullIntent, - NonNullAssertionOrigin(source, node)); - } - } - _flowAnalysis!.assert_afterCondition(node.condition); - _dispatch(node.message); - _flowAnalysis!.assert_end(); - return null; - } - - @override - DecoratedType? visitAssignmentExpression(AssignmentExpression node) { - bool isQuestionAssign = false; - bool isCompound = false; - if (node.operator.type == TokenType.QUESTION_QUESTION_EQ) { - isQuestionAssign = true; - } else if (node.operator.type != TokenType.EQ) { - isCompound = true; - } - - var sourceIsSetupCall = false; - if (node.leftHandSide is SimpleIdentifier && - _isCurrentFunctionExpressionFoundInTestSetUpCall()) { - var assignee = - getWriteOrReadElement(node.leftHandSide as SimpleIdentifier)!; - var enclosingElementOfCurrentFunction = - _currentFunctionExpression!.declaredElement!.enclosingElement; - if (enclosingElementOfCurrentFunction == assignee.enclosingElement) { - // [node]'s enclosing function is a function expression passed directly - // to a call to the test package's `setUp` function, and [node] is an - // assignment to a variable declared in the same scope as the call to - // `setUp`. - sourceIsSetupCall = true; - } - } - - var isInjectorGetAssignment = _isInjectorGetCall(node.rightHandSide); - - var expressionType = _handleAssignment(node.rightHandSide, - assignmentExpression: node, - compoundOperatorInfo: isCompound ? node : null, - questionAssignNode: isQuestionAssign ? node : null, - sourceIsSetupCall: sourceIsSetupCall, - isInjectorGetAssignment: isInjectorGetAssignment); - var conditionalNode = _conditionalNodes[node.leftHandSide]; - if (conditionalNode != null) { - expressionType = expressionType!.withNode( - NullabilityNode.forLUB(conditionalNode, expressionType.node)); - _variables.recordDecoratedExpressionType(node, expressionType); - } - - return expressionType; - } - - @override - DecoratedType visitAwaitExpression(AwaitExpression node) { - var expressionType = _dispatch(node.expression)!; - var type = expressionType.type!; - if (type.isDartCoreNull) { - // Nothing to do; awaiting `null` produces `null`. - } else if (_typeSystem.isSubtypeOf(type, typeProvider.futureDynamicType)) { - expressionType = _decoratedClassHierarchy! - .asInstanceOf(expressionType, typeProvider.futureElement) - .typeArguments[0]!; - } else if (type.isDartAsyncFutureOr) { - expressionType = expressionType.typeArguments[0]!; - } - return expressionType; - } - - @override - DecoratedType visitBinaryExpression(BinaryExpression node) { - var operatorType = node.operator.type; - var leftOperand = node.leftOperand; - var rightOperand = node.rightOperand; - if (operatorType == TokenType.EQ_EQ || operatorType == TokenType.BANG_EQ) { - var leftType = _dispatch(leftOperand)!; - _graph.connectDummy(leftType.node, DummyOrigin(source, node)); - var equalityInfo = - _flowAnalysis!.equalityOperand_end(leftOperand, leftType); - var rightType = _dispatch(rightOperand)!; - _graph.connectDummy(rightType.node, DummyOrigin(source, node)); - bool notEqual = operatorType == TokenType.BANG_EQ; - _flowAnalysis!.equalityOperation_end(node, equalityInfo, - _flowAnalysis!.equalityOperand_end(rightOperand, rightType), - notEqual: notEqual); - - void buildNullConditionInfo(NullLiteral nullLiteral, - Expression otherOperand, DecoratedType otherType) { - assert(nullLiteral != otherOperand); - // TODO(paulberry): only set falseChecksNonNull in unconditional - // control flow - // TODO(paulberry): figure out what the rules for isPure should be. - bool isPure = otherOperand is SimpleIdentifier; - var otherNode = otherType.node; - var otherTypeType = otherType.type; - if (otherTypeType is TypeParameterType) { - var boundNullability = - DecoratedTypeParameterBounds.current!.get(otherTypeType.element); - if (boundNullability != null) { - otherNode = - NullabilityNode.forLUB(otherNode, boundNullability.node); - } - } - var conditionInfo = _ConditionInfo(node, - isPure: isPure, - postDominatingIntent: _isReferenceInScope(otherOperand), - trueGuard: otherNode, - falseDemonstratesNonNullIntent: otherNode); - _conditionInfo = notEqual ? conditionInfo.not(node) : conditionInfo; - } - - if (rightOperand is NullLiteral) { - buildNullConditionInfo(rightOperand, leftOperand, leftType); - _graph.makeNullable(leftType.node, NullAwareAccessOrigin(source, node)); - } else if (leftOperand is NullLiteral) { - buildNullConditionInfo(leftOperand, rightOperand, rightType); - _graph.makeNullable( - rightType.node, NullAwareAccessOrigin(source, node)); - } - - return _makeNonNullableBoolType(node); - } else if (operatorType == TokenType.AMPERSAND_AMPERSAND || - operatorType == TokenType.BAR_BAR) { - bool isAnd = operatorType == TokenType.AMPERSAND_AMPERSAND; - _flowAnalysis!.logicalBinaryOp_begin(); - _checkExpressionNotNull(leftOperand); - _flowAnalysis! - .logicalBinaryOp_rightBegin(node.leftOperand, node, isAnd: isAnd); - _postDominatedLocals.doScoped( - action: () => _checkExpressionNotNull(rightOperand)); - _flowAnalysis!.logicalBinaryOp_end(node, rightOperand, isAnd: isAnd); - return _makeNonNullableBoolType(node); - } else if (operatorType == TokenType.QUESTION_QUESTION) { - DecoratedType expressionType; - var leftType = _dispatch(leftOperand)!; - _flowAnalysis!.ifNullExpression_rightBegin(node.leftOperand, leftType); - try { - _guards.add(leftType.node); - DecoratedType? rightType; - _postDominatedLocals.doScoped(action: () { - rightType = _dispatch(rightOperand); - }); - var ifNullNode = NullabilityNode.forIfNotNull(node); - expressionType = _decorateUpperOrLowerBound( - node, node.staticType, leftType, rightType!, true, - node: ifNullNode); - _connect(rightType!.node, expressionType.node, - IfNullOrigin(source, node), null); - } finally { - _flowAnalysis!.ifNullExpression_end(); - _guards.removeLast(); - } - _variables.recordDecoratedExpressionType(node, expressionType); - return expressionType; - } else if (operatorType.isUserDefinableOperator) { - var targetType = _checkExpressionNotNull(leftOperand); - var callee = node.staticElement; - if (callee == null) { - _dispatch(rightOperand); - return _makeNullableDynamicType(node); - } else { - var calleeType = getOrComputeElementType(node, callee, - targetType: targetType, targetExpression: leftOperand); - assert(calleeType.positionalParameters!.isNotEmpty); // TODO(paulberry) - _handleAssignment(rightOperand, - destinationType: calleeType.positionalParameters![0]); - return _fixNumericTypes(calleeType.returnType!, node.staticType); - } - } else { - // TODO(paulberry) - _dispatch(leftOperand); - _dispatch(rightOperand); - _unimplemented( - node, 'Binary expression with operator ${node.operator.lexeme}'); - } - } - - @override - DecoratedType visitBooleanLiteral(BooleanLiteral node) { - _flowAnalysis!.booleanLiteral(node, node.value); - return _makeNonNullLiteralType(node); - } - - @override - DecoratedType? visitBreakStatement(BreakStatement node) { - _flowAnalysis!.handleBreak(FlowAnalysisHelper.getLabelTarget( - node, node.label?.staticElement as LabelElement?, - isBreak: true)); - // Later statements no longer post-dominate the declarations because we - // exited (or, in parent scopes, conditionally exited). - // TODO(mfairhurst): don't clear post-dominators beyond the current loop. - _postDominatedLocals.clearEachScope(); - - return null; - } - - @override - DecoratedType? visitCascadeExpression(CascadeExpression node) { - var oldCascadeTargetType = _currentCascadeTargetType; - try { - _currentCascadeTargetType = _checkExpressionNotNull(node.target); - _dispatchList(node.cascadeSections); - return _currentCascadeTargetType; - } finally { - _currentCascadeTargetType = oldCascadeTargetType; - } - } - - @override - DecoratedType? visitCatchClause(CatchClause node) { - _flowAnalysis!.tryCatchStatement_catchBegin( - node.exceptionParameter?.declaredElement, - node.stackTraceParameter?.declaredElement); - _dispatch(node.exceptionType); - // The catch clause may not execute, so create a new scope for - // post-dominators. - _postDominatedLocals.doScoped(action: () => _dispatch(node.body)); - _flowAnalysis!.tryCatchStatement_catchEnd(); - return null; - } - - @override - DecoratedType? visitClassDeclaration(ClassDeclaration node) { - visitClassOrMixinOrExtensionDeclaration(node); - _dispatch(node.extendsClause); - _dispatch(node.implementsClause); - _dispatch(node.withClause); - _dispatch(node.typeParameters); - return null; - } - - DecoratedType? visitClassOrMixinOrExtensionDeclaration( - CompilationUnitMember node) { - assert(node is ClassDeclaration || - node is ExtensionDeclaration || - node is MixinDeclaration); - try { - _currentInterfaceOrExtension = node.declaredElement; - - List members; - if (node is ClassDeclaration) { - members = node.members; - } else if (node is ExtensionDeclaration) { - members = node.members; - } else { - members = (node as MixinDeclaration).members; - } - - _fieldsNotInitializedAtDeclaration = { - for (var member in members) - if (member is FieldDeclaration && - _variables.getLateHint(source, member.fields) == null) - for (var field in member.fields.variables) - if (!field.declaredElement!.isStatic && field.initializer == null) - field.declaredElement as FieldElement? - }; - if (_currentInterfaceOrExtension is ClassElement && - (_currentInterfaceOrExtension as ClassElement) - .unnamedConstructor - ?.isSynthetic == - true) { - _handleUninitializedFields(node, _fieldsNotInitializedAtDeclaration!); - } - _dispatchList(node.metadata); - _dispatchList(members); - _fieldsNotInitializedAtDeclaration = null; - } finally { - _currentInterfaceOrExtension = null; - } - return null; - } - - @override - DecoratedType? visitClassTypeAlias(ClassTypeAlias node) { - _dispatch(node.superclass); - _dispatch(node.implementsClause); - _dispatch(node.withClause); - var classElement = node.declaredElement!; - var supertype = classElement.supertype!; - var superElement = supertype.element; - for (var constructorElement in classElement.constructors) { - assert(constructorElement.isSynthetic); - var superConstructorElement = - superElement.getNamedConstructor(constructorElement.name)!; - var constructorDecoratedType = _variables - .decoratedElementType(constructorElement) - .substitute(_decoratedClassHierarchy! - .getDecoratedSupertype(classElement, superElement) - .asSubstitution); - var superConstructorDecoratedType = - _variables.decoratedElementType(superConstructorElement); - var origin = ImplicitMixinSuperCallOrigin(source, node); - _linkDecoratedTypeParameters( - constructorDecoratedType, superConstructorDecoratedType, origin, - isUnion: true); - } - return null; - } - - @override - DecoratedType? visitComment(Comment node) { - // Ignore comments. - return null; - } - - @override - DecoratedType visitConditionalExpression(ConditionalExpression node) { - _flowAnalysis!.conditional_conditionBegin(); - _checkExpressionNotNull(node.condition); - NullabilityNode? trueGuard; - NullabilityNode? falseGuard; - if (identical(_conditionInfo?.condition, node.condition)) { - trueGuard = _conditionInfo!.trueGuard; - falseGuard = _conditionInfo!.falseGuard; - _variables.recordConditionalDiscard(source, node, - ConditionalDiscard(trueGuard, falseGuard, _conditionInfo!.isPure)); - } - - late DecoratedType thenType; - late DecoratedType elseType; - - // Post-dominators diverge as we branch in the conditional. - // Note: we don't have to create a scope for each branch because they can't - // define variables. - _postDominatedLocals.doScoped(action: () { - _flowAnalysis!.conditional_thenBegin(node.condition, node); - if (trueGuard != null) { - _guards.add(trueGuard); - } - try { - thenType = _dispatch(node.thenExpression)!; - if (trueGuard != null) { - thenType = thenType - .withNode(_nullabilityNodeForGLB(node, thenType.node, trueGuard)); - } - } finally { - if (trueGuard != null) { - _guards.removeLast(); - } - } - _flowAnalysis!.conditional_elseBegin(node.thenExpression, thenType); - if (falseGuard != null) { - _guards.add(falseGuard); - } - try { - elseType = _dispatch(node.elseExpression)!; - if (falseGuard != null) { - elseType = elseType.withNode( - _nullabilityNodeForGLB(node, elseType.node, falseGuard)); - } - } finally { - if (falseGuard != null) { - _guards.removeLast(); - } - } - }); - - var overallType = _decorateUpperOrLowerBound( - node, node.staticType, thenType, elseType, true); - _flowAnalysis! - .conditional_end(node, overallType, node.elseExpression, elseType); - _variables.recordDecoratedExpressionType(node, overallType); - return overallType; - } - - @override - DecoratedType? visitConstructorDeclaration(ConstructorDeclaration node) { - _fieldsNotInitializedByConstructor = - _fieldsNotInitializedAtDeclaration!.toSet(); - _dispatch(node.redirectedConstructor?.type.typeArguments); - _handleExecutableDeclaration( - node, - node.declaredElement!, - node.metadata, - null, - node.parameters, - node.initializers, - node.body, - node.redirectedConstructor); - _fieldsNotInitializedByConstructor = null; - return null; - } - - @override - DecoratedType? visitConstructorFieldInitializer( - ConstructorFieldInitializer node) { - _fieldsNotInitializedByConstructor!.remove(node.fieldName.staticElement); - _handleAssignment(node.expression, - destinationType: - getOrComputeElementType(node, node.fieldName.staticElement!)); - return null; - } - - @override - DecoratedType? visitContinueStatement(ContinueStatement node) { - _flowAnalysis!.handleContinue(FlowAnalysisHelper.getLabelTarget( - node, node.label?.staticElement as LabelElement?, - isBreak: false)); - // Later statements no longer post-dominate the declarations because we - // exited (or, in parent scopes, conditionally exited). - // TODO(mfairhurst): don't clear post-dominators beyond the current loop. - _postDominatedLocals.clearEachScope(); - - return null; - } - - @override - DecoratedType? visitDefaultFormalParameter(DefaultFormalParameter node) { - _dispatch(node.parameter); - var defaultValue = node.defaultValue; - var declaredElement = node.declaredElement; - if (defaultValue == null) { - if (declaredElement!.hasRequired) { - // Nothing to do; the implicit default value of `null` will never be - // reached. - } else if (_variables.getRequiredHint(source, node) != null) { - // Nothing to do; assume the implicit default value of `null` will never - // be reached. - } else { - var enclosingElement = declaredElement.enclosingElement; - if (enclosingElement is ConstructorElement && - enclosingElement.isFactory && - enclosingElement.redirectedConstructor != null) { - // Redirecting factory constructors inherit their parameters' default - // values from the constructors they redirect to, so the lack of a - // default value doesn't mean the parameter has to be nullable. - } else { - _graph.makeNullable( - getOrComputeElementType(node, declaredElement).node, - OptionalFormalParameterOrigin(source, node)); - } - } - } else { - _handleAssignment(defaultValue, - destinationType: getOrComputeElementType(node, declaredElement!), - fromDefaultValue: true); - } - return null; - } - - @override - DecoratedType? visitDoStatement(DoStatement node) { - _flowAnalysis!.doStatement_bodyBegin(node); - _dispatch(node.body); - _flowAnalysis!.doStatement_conditionBegin(); - _checkExpressionNotNull(node.condition); - _flowAnalysis!.doStatement_end(node.condition); - return null; - } - - @override - DecoratedType visitDoubleLiteral(DoubleLiteral node) { - return _makeNonNullLiteralType(node); - } - - @override - DecoratedType? visitExpressionFunctionBody(ExpressionFunctionBody node) { - if (_currentFunctionType == null) { - _unimplemented( - node, - 'ExpressionFunctionBody with no current function ' - '(parent is ${node.parent.runtimeType})'); - } - _handleAssignment(node.expression, - destinationType: _currentFunctionType!.returnType, - wrapFuture: node.isAsynchronous); - return null; - } - - @override - DecoratedType visitExpressionStatement(ExpressionStatement node) { - var decoratedType = _dispatch(node.expression)!; - if (node.expression is! CascadeExpression) { - // Don't add a dummy edge for cascade expression, since - // it forces the target of cascade to be nullable, which - // is almost always wrong. - _graph.connectDummy(decoratedType.node, DummyOrigin(source, node)); - } - return decoratedType; - } - - DecoratedType? visitExtensionDeclaration(ExtensionDeclaration node) { - _dispatch(node.typeParameters); - _dispatch(node.extendedType); - _currentExtendedType = - _variables.decoratedTypeAnnotation(source, node.extendedType); - visitClassOrMixinOrExtensionDeclaration(node); - _currentExtendedType = null; - return null; - } - - @override - DecoratedType? visitExtensionOverride(ExtensionOverride node) { - return _dispatch(node.argumentList.arguments.single); - } - - @override - DecoratedType? visitFieldFormalParameter(FieldFormalParameter node) { - _dispatchList(node.metadata); - _dispatch(node.parameters); - var parameterElement = node.declaredElement as FieldFormalParameterElement; - var parameterType = _variables.decoratedElementType(parameterElement); - var field = parameterElement.field; - if (field != null) { - _fieldsNotInitializedByConstructor!.remove(field); - var fieldType = _variables.decoratedElementType(field); - var origin = FieldFormalParameterOrigin(source, node); - if (node.type == null) { - _linkDecoratedTypes(parameterType, fieldType, origin, isUnion: false); - _checkAssignment(origin, FixReasonTarget.root, - source: fieldType, destination: parameterType, hard: false); - } else { - _dispatch(node.type); - _checkAssignment(origin, FixReasonTarget.root, - source: parameterType, destination: fieldType, hard: true); - } - } - - return null; - } - - @override - DecoratedType? visitForElement(ForElement node) { - _handleForLoopParts(node, node.forLoopParts, node.body, - (body) => _handleCollectionElement(body as CollectionElement)); - return null; - } - - @override - DecoratedType? visitForStatement(ForStatement node) { - _handleForLoopParts( - node, node.forLoopParts, node.body, (body) => _dispatch(body)); - return null; - } - - @override - DecoratedType? visitFunctionDeclaration(FunctionDeclaration node) { - _dispatchList(node.metadata); - _dispatch(node.returnType); - if (_flowAnalysis != null) { - // This is a local function. - var previousPostDominatedLocals = _postDominatedLocals; - var previousElementsWrittenToInLocalFunction = - _elementsWrittenToInLocalFunction; - try { - _elementsWrittenToInLocalFunction = {}; - _postDominatedLocals = ScopedSet(); - _flowAnalysis!.functionExpression_begin(node); - _dispatch(node.functionExpression); - _flowAnalysis!.functionExpression_end(); - } finally { - for (var element in _elementsWrittenToInLocalFunction!) { - previousElementsWrittenToInLocalFunction?.add(element); - previousPostDominatedLocals.removeFromAllScopes(element); - } - _elementsWrittenToInLocalFunction = - previousElementsWrittenToInLocalFunction; - _postDominatedLocals = previousPostDominatedLocals; - } - } else { - _createFlowAnalysis(node, node.functionExpression.parameters); - // Initialize a new postDominator scope that contains only the parameters. - try { - _dispatch(node.functionExpression); - _flowAnalysis!.finish(); - } finally { - _flowAnalysis = null; - _assignedVariables = null; - } - var declaredElement = node.declaredElement; - if (declaredElement is PropertyAccessorElement) { - if (declaredElement.isGetter) { - var setter = declaredElement.correspondingSetter; - if (setter != null) { - _handleGetterSetterCorrespondence( - node, null, declaredElement, setter.declaration); - } - } else { - assert(declaredElement.isSetter); - var getter = declaredElement.correspondingGetter; - if (getter != null) { - _handleGetterSetterCorrespondence( - node, null, getter.declaration, declaredElement); - } - } - } else if (declaredElement != null && declaredElement.isPublic) { - _makeArgumentsNullable(declaredElement, node); - } - } - return null; - } - - @override - DecoratedType? visitFunctionExpression(FunctionExpression node) { - // TODO(mfairhurst): enable edge builder "_insideFunction" hard edge tests. - _dispatch(node.parameters); - _dispatch(node.typeParameters); - if (node.parent is! FunctionDeclaration) { - _flowAnalysis!.functionExpression_begin(node); - } - _addParametersToFlowAnalysis(node.parameters); - var previousFunction = _currentFunctionExpression; - var previousFunctionType = _currentFunctionType; - var previousFieldFormals = _currentFieldFormals; - _currentFunctionExpression = node; - _currentFunctionType = - _variables.decoratedElementType(node.declaredElement!); - _currentFieldFormals = const {}; - var previousPostDominatedLocals = _postDominatedLocals; - var previousElementsWrittenToInLocalFunction = - _elementsWrittenToInLocalFunction; - var previousExecutable = _currentExecutable; - _currentExecutable ??= node.declaredElement; - try { - if (node.parent is! FunctionDeclaration) { - _elementsWrittenToInLocalFunction = {}; - } - _postDominatedLocals = ScopedSet(); - _postDominatedLocals.doScoped( - elements: node.declaredElement!.parameters, - action: () => _dispatch(node.body)); - _variables.recordDecoratedExpressionType(node, _currentFunctionType); - return _currentFunctionType; - } finally { - if (node.parent is! FunctionDeclaration) { - _flowAnalysis!.functionExpression_end(); - for (var element in _elementsWrittenToInLocalFunction!) { - previousElementsWrittenToInLocalFunction?.add(element); - previousPostDominatedLocals.removeFromAllScopes(element); - } - _elementsWrittenToInLocalFunction = - previousElementsWrittenToInLocalFunction; - } - _currentFunctionType = previousFunctionType; - _currentFieldFormals = previousFieldFormals; - _currentFunctionExpression = previousFunction; - _postDominatedLocals = previousPostDominatedLocals; - _currentExecutable = previousExecutable; - } - } - - @override - DecoratedType? visitFunctionExpressionInvocation( - FunctionExpressionInvocation node) { - final argumentList = node.argumentList; - final typeArguments = node.typeArguments; - _dispatch(typeArguments); - DecoratedType calleeType = _checkExpressionNotNull(node.function); - DecoratedType? result; - if (calleeType.type is FunctionType) { - result = _handleInvocationArguments(node, argumentList.arguments, - typeArguments, node.typeArgumentTypes, calleeType, null, - invokeType: node.staticInvokeType); - } else { - // Invocation of type `dynamic` or `Function`. - _dispatch(argumentList); - result = _makeNullableDynamicType(node); - } - return result; - } - - @override - DecoratedType? visitIfElement(IfElement node) { - _flowAnalysis!.ifStatement_conditionBegin(); - _checkExpressionNotNull(node.expression); - _flowAnalysis!.ifStatement_thenBegin(node.expression, node); - NullabilityNode? trueGuard; - NullabilityNode? falseGuard; - if (identical(_conditionInfo?.condition, node.expression)) { - trueGuard = _conditionInfo!.trueGuard; - falseGuard = _conditionInfo!.falseGuard; - _variables.recordConditionalDiscard(source, node, - ConditionalDiscard(trueGuard, falseGuard, _conditionInfo!.isPure)); - } - if (trueGuard != null) { - _guards.add(trueGuard); - } - try { - _postDominatedLocals.doScoped( - action: () => _handleCollectionElement(node.thenElement)); - } finally { - if (trueGuard != null) { - _guards.removeLast(); - } - } - if (node.elseElement != null) { - _flowAnalysis!.ifStatement_elseBegin(); - if (falseGuard != null) { - _guards.add(falseGuard); - } - try { - _postDominatedLocals.doScoped( - action: () => _handleCollectionElement(node.elseElement)); - } finally { - if (falseGuard != null) { - _guards.removeLast(); - } - } - } - _flowAnalysis!.ifStatement_end(node.elseElement != null); - return null; - } - - @override - DecoratedType? visitIfStatement(IfStatement node) { - _flowAnalysis!.ifStatement_conditionBegin(); - _checkExpressionNotNull(node.expression); - NullabilityNode? trueGuard; - NullabilityNode? falseGuard; - if (identical(_conditionInfo?.condition, node.expression)) { - trueGuard = _conditionInfo!.trueGuard; - falseGuard = _conditionInfo!.falseGuard; - _variables.recordConditionalDiscard(source, node, - ConditionalDiscard(trueGuard, falseGuard, _conditionInfo!.isPure)); - } - if (trueGuard != null) { - _guards.add(trueGuard); - } - try { - _flowAnalysis!.ifStatement_thenBegin(node.expression, node); - // We branched, so create a new scope for post-dominators. - _postDominatedLocals.doScoped( - action: () => _dispatch(node.thenStatement)); - } finally { - if (trueGuard != null) { - _guards.removeLast(); - } - } - if (falseGuard != null) { - _guards.add(falseGuard); - } - var elseStatement = node.elseStatement; - try { - if (elseStatement != null) { - _flowAnalysis!.ifStatement_elseBegin(); - // We branched, so create a new scope for post-dominators. - _postDominatedLocals.doScoped( - action: () => _dispatch(node.elseStatement)); - } - } finally { - _flowAnalysis!.ifStatement_end(elseStatement != null); - if (falseGuard != null) { - _guards.removeLast(); - } - } - return null; - } - - @override - DecoratedType? visitImplicitCallReference(ImplicitCallReference node) { - return _handlePropertyAccessGeneralized( - node: node, - target: node.expression, - propertyName: 'call', - isNullAware: false, - isCascaded: false, - inSetterContext: false, - callee: node.staticElement); - } - - @override - DecoratedType? visitIndexExpression(IndexExpression node) { - DecoratedType? targetType; - var target = node.target; - if (node.isCascaded) { - targetType = _currentCascadeTargetType; - } else if (target != null) { - targetType = _checkExpressionNotNull(target); - } - var callee = getWriteOrReadElement(node); - DecoratedType? result; - if (callee == null) { - // Dynamic dispatch. The return type is `dynamic`. - // TODO(paulberry): would it be better to assume a return type of `Never` - // so that we don't unnecessarily propagate nullabilities everywhere? - result = _makeNullableDynamicType(node); - } else { - var calleeType = getOrComputeElementType(node, callee, - targetType: targetType, targetExpression: target); - // TODO(paulberry): substitute if necessary - _handleAssignment(node.index, - destinationType: calleeType.positionalParameters![0]); - if (node.inSetterContext()) { - result = calleeType.positionalParameters![1]; - } else { - result = calleeType.returnType; - } - } - return result; - } - - @override - DecoratedType visitInstanceCreationExpression( - InstanceCreationExpression node) { - var callee = node.constructorName.staticElement!; - var typeParameters = callee.enclosingElement.typeParameters; - Iterable typeArgumentTypes; - List decoratedTypeArguments; - var typeArguments = node.constructorName.type.typeArguments; - late List parameterEdgeOrigins; - var target = - NullabilityNodeTarget.text('constructed type').withCodeRef(node); - if (typeArguments != null) { - _dispatch(typeArguments); - typeArgumentTypes = typeArguments.arguments.map((t) => t.type); - decoratedTypeArguments = typeArguments.arguments - .map((t) => _variables.decoratedTypeAnnotation(source, t)) - .toList(); - parameterEdgeOrigins = typeArguments.arguments - .map((typeAnn) => TypeParameterInstantiationOrigin(source, typeAnn)) - .toList(); - } else { - var staticType = node.staticType; - if (staticType is InterfaceType) { - typeArgumentTypes = staticType.typeArguments; - int index = 0; - decoratedTypeArguments = typeArgumentTypes.map((t) { - return DecoratedType.forImplicitType( - typeProvider, t, _graph, target.typeArgument(index++)); - }).toList(); - instrumentation?.implicitTypeArguments( - source, node, decoratedTypeArguments); - parameterEdgeOrigins = List.filled(typeArgumentTypes.length, - InferredTypeParameterInstantiationOrigin(source, node)); - } else { - // Note: this could happen if the code being migrated has errors. - typeArgumentTypes = const []; - decoratedTypeArguments = const []; - } - } - - if (node.staticType!.isDartCoreList && - callee.name == '' && - node.argumentList.arguments.length == 1) { - _graph.connect(_graph.always, decoratedTypeArguments[0].node, - ListLengthConstructorOrigin(source, node)); - } - - var nullabilityNode = NullabilityNode.forInferredType(target); - _graph.makeNonNullable( - nullabilityNode, InstanceCreationOrigin(source, node)); - var createdType = DecoratedType(node.staticType, nullabilityNode, - typeArguments: decoratedTypeArguments); - var calleeType = - getOrComputeElementType(node, callee, targetType: createdType); - for (var i = 0; i < decoratedTypeArguments.length; ++i) { - _checkAssignment(parameterEdgeOrigins.elementAt(i), - FixReasonTarget.root.typeArgument(i), - source: decoratedTypeArguments[i], - destination: - _variables.decoratedTypeParameterBound(typeParameters[i])!, - hard: true); - } - _handleInvocationArguments(node, node.argumentList.arguments, typeArguments, - typeArgumentTypes, calleeType, typeParameters); - return createdType; - } - - @override - DecoratedType visitIntegerLiteral(IntegerLiteral node) { - return _makeNonNullLiteralType(node); - } - - @override - DecoratedType visitIsExpression(IsExpression node) { - var expression = node.expression; - var expressionNode = _dispatch(expression)!.node; - var type = node.type; - _dispatch(type); - var decoratedType = _variables.decoratedTypeAnnotation(source, type); - // The main type of the is check historically could not be nullable. - // Making it nullable could change runtime behavior. - _graph.makeNonNullable( - decoratedType.node, IsCheckMainTypeOrigin(source, type)); - _conditionInfo = _ConditionInfo(node, - isPure: expression is SimpleIdentifier, - postDominatingIntent: _isReferenceInScope(expression), - trueDemonstratesNonNullIntent: expressionNode); - if (node.notOperator != null) { - _conditionInfo = _conditionInfo!.not(node); - } - if (!_assumeNonNullabilityInCasts) { - // TODO(mfairhurst): wire this to handleDowncast if we do not assume - // nullability. - assert(false); - } - _flowAnalysis!.isExpression_end( - node, expression, node.notOperator != null, decoratedType); - return _makeNonNullableBoolType(node); - } - - @override - DecoratedType? visitLabel(Label node) { - // Labels are identifiers but they don't have types so we don't need to - // visit them directly. - return null; - } - - @override - DecoratedType? visitLibraryDirective(LibraryDirective node) { - // skip directives, but not their metadata - _dispatchList(node.metadata); - return null; - } - - @override - DecoratedType visitListLiteral(ListLiteral node) { - final previousLiteralType = _currentLiteralElementType; - try { - var listType = node.staticType as InterfaceType?; - if (node.typeArguments == null) { - var target = - NullabilityNodeTarget.text('list element type').withCodeRef(node); - var elementType = DecoratedType.forImplicitType( - typeProvider, listType!.typeArguments[0], _graph, target); - instrumentation?.implicitTypeArguments(source, node, [elementType]); - _currentLiteralElementType = elementType; - } else { - _dispatch(node.typeArguments); - _currentLiteralElementType = _variables.decoratedTypeAnnotation( - source, node.typeArguments!.arguments[0]); - } - node.elements.forEach(_handleCollectionElement); - return _makeNonNullLiteralType(node, - typeArguments: [_currentLiteralElementType]); - } finally { - _currentLiteralElementType = previousLiteralType; - } - } - - @override - DecoratedType? visitMapLiteralEntry(MapLiteralEntry node) { - assert(_currentMapKeyType != null); - assert(_currentMapValueType != null); - _handleAssignment(node.key, destinationType: _currentMapKeyType); - _handleAssignment(node.value, destinationType: _currentMapValueType); - return null; - } - - @override - DecoratedType? visitMethodDeclaration(MethodDeclaration node) { - if (BuiltValueTransformer.findNullableAnnotation(node) != null) { - _graph.makeNullable( - _variables - .decoratedElementType(node.declaredElement!.declaration) - .returnType! - .node, - BuiltValueNullableOrigin(source, node)); - } - _handleExecutableDeclaration(node, node.declaredElement!, node.metadata, - node.returnType, node.parameters, null, node.body, null); - _dispatch(node.typeParameters); - return null; - } - - @override - DecoratedType? visitMethodInvocation(MethodInvocation node) { - DecoratedType? targetType; - var target = node.target; - bool isNullAware = node.isNullAware; - var callee = node.methodName.staticElement; - bool calleeIsStatic = callee is ExecutableElement && callee.isStatic; - _dispatch(node.typeArguments); - - if (node.isCascaded) { - targetType = _currentCascadeTargetType; - } else if (target != null) { - if (_isPrefix(target)) { - // Nothing to do. - } else if (calleeIsStatic) { - _dispatch(target); - } else if (isNullAware) { - targetType = _handleNullAwareTarget(target, node); - } else { - targetType = _handleTarget(target, node.methodName.name, callee); - } - } else if (target == null && callee!.enclosingElement is ClassElement) { - targetType = _thisOrSuper(node); - _checkThisNotNull(targetType, node); - } - DecoratedType? expressionType; - DecoratedType? calleeType; - if (targetType != null && - targetType.type is FunctionType && - node.methodName.name == 'call') { - // If `X` has a function type, then in the expression `X.call()`, the - // function being called is `X` itself, so the callee type is simply the - // type of `X`. - calleeType = targetType; - } else if (callee != null) { - calleeType = getOrComputeElementType(node, callee, - targetType: targetType, - targetExpression: target, - isNullAware: isNullAware); - if (callee is PropertyAccessorElement) { - calleeType = calleeType.returnType; - } - } - if (calleeType == null) { - // Dynamic dispatch. The return type is `dynamic`. - // TODO(paulberry): would it be better to assume a return type of `Never` - // so that we don't unnecessarily propagate nullabilities everywhere? - _dispatch(node.argumentList); - expressionType = _makeNullableDynamicType(node); - } else { - expressionType = _handleInvocationArguments( - node, - node.argumentList.arguments, - node.typeArguments, - node.typeArgumentTypes, - calleeType, - null, - invokeType: node.staticInvokeType); - // Do any deferred processing for this method invocation. - var deferredProcessing = _deferredMethodInvocationProcessing.remove(node); - if (deferredProcessing != null) { - expressionType = deferredProcessing(expressionType); - } - if (isNullAware) { - expressionType = expressionType!.withNode( - NullabilityNode.forLUB(targetType!.node, expressionType.node)); - } - _variables.recordDecoratedExpressionType(node, expressionType); - } - _handleCustomCheckNotNull(node); - _handleQuiverCheckNotNull(node); - return expressionType; - } - - @override - DecoratedType? visitMixinDeclaration(MixinDeclaration node) { - visitClassOrMixinOrExtensionDeclaration(node); - _dispatch(node.implementsClause); - _dispatch(node.onClause); - _dispatch(node.typeParameters); - return null; - } - - @override - DecoratedType? visitNamedType(NamedType node) { - try { - _typeNameNesting++; - var typeArguments = node.typeArguments?.arguments; - var element = node.element; - if (element is TypeAliasElement && - element.aliasedElement is GenericFunctionTypeElement) { - var aliasedElement = element.aliasedElement!; - final typedefType = _variables.decoratedElementType(aliasedElement); - final typeNameType = _variables.decoratedTypeAnnotation(source, node); - - Map substitutions; - if (node.typeArguments == null) { - // TODO(mfairhurst): substitute instantiations to bounds - substitutions = {}; - } else { - substitutions = - Map.fromIterables( - element.typeParameters, - node.typeArguments!.arguments.map( - (t) => _variables.decoratedTypeAnnotation(source, t))); - } - - final decoratedType = typedefType.substitute(substitutions); - final origin = TypedefReferenceOrigin(source, node); - _linkDecoratedTypeParameters(decoratedType, typeNameType, origin, - isUnion: true); - _linkDecoratedTypes( - decoratedType.returnType!, typeNameType.returnType, origin, - isUnion: true); - } else if (element is TypeParameterizedElement) { - if (typeArguments == null) { - var instantiatedType = - _variables.decoratedTypeAnnotation(source, node); - var origin = InstantiateToBoundsOrigin(source, node); - for (int i = 0; i < instantiatedType.typeArguments.length; i++) { - _linkDecoratedTypes( - instantiatedType.typeArguments[i]!, - _variables - .decoratedTypeParameterBound(element.typeParameters[i]), - origin, - isUnion: false); - } - } else { - for (int i = 0; i < typeArguments.length; i++) { - DecoratedType? bound; - bound = _variables - .decoratedTypeParameterBound(element.typeParameters[i]); - assert(bound != null); - var argumentType = - _variables.decoratedTypeAnnotation(source, typeArguments[i]); - _checkAssignment( - TypeParameterInstantiationOrigin(source, typeArguments[i]), - FixReasonTarget.root, - source: argumentType, - destination: bound!, - hard: true); - } - } - } - node.visitChildren(this); - // If the type name is followed by a `/*!*/` comment, it is considered to - // apply to the type and not to the "as" expression. In order to prevent - // a future call to _handleNullCheck from interpreting it as applying to - // the "as" expression, we need to store the `/*!*/` comment in - // _nullCheckHints. - var token = node.endToken; - _nullCheckHints[token] = getPostfixHint(token); - namedTypeVisited(node); // Note this has been visited to TypeNameTracker. - return null; - } finally { - _typeNameNesting--; - } - } - - @override - DecoratedType? visitNamespaceDirective(NamespaceDirective node) { - // skip directives, but not their metadata - _dispatchList(node.metadata); - return null; - } - - @override - DecoratedType? visitNode(AstNode node) { - for (var child in node.childEntities) { - if (child is AstNode) { - _dispatch(child); - } - } - return null; - } - - @override - DecoratedType visitNullLiteral(NullLiteral node) { - var target = NullabilityNodeTarget.text('null literal').withCodeRef(node); - var decoratedType = DecoratedType.forImplicitType( - typeProvider, node.staticType, _graph, target); - _flowAnalysis!.nullLiteral(node, decoratedType); - _graph.makeNullable(decoratedType.node, LiteralOrigin(source, node)); - return decoratedType; - } - - @override - DecoratedType? visitParenthesizedExpression(ParenthesizedExpression node) { - var result = _dispatch(node.expression); - _flowAnalysis!.parenthesizedExpression(node, node.expression); - return result; - } - - @override - DecoratedType? visitPartOfDirective(PartOfDirective node) { - // skip directives, but not their metadata - _dispatchList(node.metadata); - return null; - } - - @override - DecoratedType visitPostfixExpression(PostfixExpression node) { - if (node.operator.type.isIncrementOperator) { - var operand = node.operand; - var targetType = _checkExpressionNotNull(operand); - var callee = node.staticElement; - DecoratedType writeType; - if (callee == null) { - // Dynamic dispatch. The return type is `dynamic`. - // TODO(paulberry): would it be better to assume a return type of `Never` - // so that we don't unnecessarily propagate nullabilities everywhere? - writeType = _makeNullableDynamicType(node); - } else { - var calleeType = getOrComputeElementType(node, callee, - targetType: targetType, targetExpression: operand); - writeType = _fixNumericTypes(calleeType.returnType!, node.staticType); - } - if (operand is SimpleIdentifier) { - var element = getWriteOrReadElement(operand); - if (element is PromotableElement) { - _flowAnalysis!.write(node, element, writeType, null); - } - } - return targetType; - } - _unimplemented( - node, 'Postfix expression with operator ${node.operator.lexeme}'); - } - - @override - DecoratedType? visitPrefixedIdentifier(PrefixedIdentifier node) { - if (node.prefix.staticElement is LibraryImportElement) { - // TODO(paulberry) - _unimplemented(node, 'PrefixedIdentifier with a prefix'); - } else { - return _handlePropertyAccess( - node, node.prefix, node.identifier, false, false); - } - } - - @override - DecoratedType? visitPrefixExpression(PrefixExpression node) { - var operand = node.operand; - var targetType = _checkExpressionNotNull(operand); - var operatorType = node.operator.type; - if (operatorType == TokenType.BANG) { - _flowAnalysis!.logicalNot_end(node, operand); - return _makeNonNullableBoolType(node); - } else { - var callee = node.staticElement; - var isIncrementOrDecrement = operatorType.isIncrementOperator; - DecoratedType? staticType; - if (callee == null) { - // Dynamic dispatch. The return type is `dynamic`. - // TODO(paulberry): would it be better to assume a return type of `Never` - // so that we don't unnecessarily propagate nullabilities everywhere? - staticType = _makeNullableDynamicType(node); - } else { - var calleeType = getOrComputeElementType(node, callee, - targetType: targetType, targetExpression: operand); - if (isIncrementOrDecrement) { - staticType = - _fixNumericTypes(calleeType.returnType!, node.staticType); - } else { - staticType = _handleInvocationArguments( - node, [], null, null, calleeType, null); - } - } - if (isIncrementOrDecrement) { - if (operand is SimpleIdentifier) { - var element = getWriteOrReadElement(operand); - if (element is PromotableElement) { - _flowAnalysis!.write(node, element, staticType!, null); - } - } - } - return staticType; - } - } - - @override - DecoratedType? visitPropertyAccess(PropertyAccess node) { - return _handlePropertyAccess(node, node.target, node.propertyName, - node.isNullAware, node.isCascaded); - } - - @override - DecoratedType? visitRedirectingConstructorInvocation( - RedirectingConstructorInvocation node) { - var callee = node.staticElement!; - var calleeType = _variables.decoratedElementType(callee); - _handleInvocationArguments( - node, node.argumentList.arguments, null, null, calleeType, null); - return null; - } - - @override - DecoratedType visitRethrowExpression(RethrowExpression node) { - _flowAnalysis!.handleExit(); - var target = - NullabilityNodeTarget.text('rethrow expression').withCodeRef(node); - var nullabilityNode = NullabilityNode.forInferredType(target); - _graph.makeNonNullable(nullabilityNode, ThrowOrigin(source, node)); - return DecoratedType(node.staticType, nullabilityNode); - } - - @override - DecoratedType? visitReturnStatement(ReturnStatement node) { - DecoratedType? returnType = _currentFunctionType!.returnType; - Expression? returnValue = node.expression; - var functionBody = node.thisOrAncestorOfType()!; - if (functionBody.isGenerator) { - // Do not connect the return value to the return type. - return _dispatch(returnValue); - } - final isAsync = functionBody.isAsynchronous; - if (returnValue == null) { - var target = - NullabilityNodeTarget.text('implicit null return').withCodeRef(node); - var implicitNullType = DecoratedType.forImplicitType( - typeProvider, typeProvider.nullType, _graph, target); - var origin = ImplicitNullReturnOrigin(source, node); - _graph.makeNullable(implicitNullType.node, origin); - _checkAssignment(origin, FixReasonTarget.root, - source: - isAsync ? _futureOf(implicitNullType, node) : implicitNullType, - destination: returnType!, - hard: false); - } else { - _handleAssignment(returnValue, - destinationType: returnType, wrapFuture: isAsync); - } - - _flowAnalysis!.handleExit(); - // Later statements no longer post-dominate the declarations because we - // exited (or, in parent scopes, conditionally exited). - // TODO(mfairhurst): don't clear post-dominators beyond the current function. - _postDominatedLocals.clearEachScope(); - - return null; - } - - @override - DecoratedType visitSetOrMapLiteral(SetOrMapLiteral node) { - var setOrMapType = node.staticType as InterfaceType?; - var typeArguments = node.typeArguments?.arguments; - - if (node.isSet) { - final previousLiteralType = _currentLiteralElementType; - try { - if (typeArguments == null) { - assert(setOrMapType!.typeArguments.length == 1); - var target = - NullabilityNodeTarget.text('set element type').withCodeRef(node); - var elementType = DecoratedType.forImplicitType( - typeProvider, setOrMapType!.typeArguments[0], _graph, target); - instrumentation?.implicitTypeArguments(source, node, [elementType]); - _currentLiteralElementType = elementType; - } else { - assert(typeArguments.length == 1); - _dispatch(node.typeArguments); - _currentLiteralElementType = - _variables.decoratedTypeAnnotation(source, typeArguments[0]); - } - node.elements.forEach(_handleCollectionElement); - return _makeNonNullLiteralType(node, - typeArguments: [_currentLiteralElementType]); - } finally { - _currentLiteralElementType = previousLiteralType; - } - } else { - assert(node.isMap); - - final previousKeyType = _currentMapKeyType; - final previousValueType = _currentMapValueType; - try { - if (typeArguments == null) { - assert(setOrMapType!.typeArguments.length == 2); - var targetKey = - NullabilityNodeTarget.text('map key type').withCodeRef(node); - var keyType = DecoratedType.forImplicitType( - typeProvider, setOrMapType!.typeArguments[0], _graph, targetKey); - _currentMapKeyType = keyType; - var targetValue = - NullabilityNodeTarget.text('map value type').withCodeRef(node); - var valueType = DecoratedType.forImplicitType( - typeProvider, setOrMapType.typeArguments[1], _graph, targetValue); - _currentMapValueType = valueType; - instrumentation - ?.implicitTypeArguments(source, node, [keyType, valueType]); - } else { - assert(typeArguments.length == 2); - _dispatch(node.typeArguments); - _currentMapKeyType = - _variables.decoratedTypeAnnotation(source, typeArguments[0]); - _currentMapValueType = - _variables.decoratedTypeAnnotation(source, typeArguments[1]); - } - - node.elements.forEach(_handleCollectionElement); - return _makeNonNullLiteralType(node, - typeArguments: [_currentMapKeyType, _currentMapValueType]); - } finally { - _currentMapKeyType = previousKeyType; - _currentMapValueType = previousValueType; - } - } - } - - @override - DecoratedType? visitSimpleIdentifier(SimpleIdentifier node) { - DecoratedType? targetType; - DecoratedType? result; - var staticElement = _favorFieldFormalElements(getWriteOrReadElement(node)); - if (staticElement is PromotableElement) { - if (!node.inDeclarationContext()) { - var promotedType = _flowAnalysis!.variableRead(node, staticElement); - if (promotedType != null) return promotedType; - } - var type = getOrComputeElementType(node, staticElement); - if (!node.inDeclarationContext() && - node.inGetterContext() && - !_lateHintedLocals.contains(staticElement) && - !_flowAnalysis!.isAssigned(staticElement)) { - _graph.makeNullable(type.node, UninitializedReadOrigin(source, node)); - } - result = type; - } else if (staticElement is FunctionElement || - staticElement is MethodElement || - staticElement is ConstructorElement) { - if (staticElement!.enclosingElement is ClassElement) { - targetType = _thisOrSuper(node); - } - result = - getOrComputeElementType(node, staticElement, targetType: targetType); - } else if (staticElement is PropertyAccessorElement) { - if (staticElement.enclosingElement is ClassElement) { - targetType = _thisOrSuper(node); - } - var elementType = - getOrComputeElementType(node, staticElement, targetType: targetType); - result = staticElement.isGetter - ? elementType.returnType - : elementType.positionalParameters![0]; - } else if (staticElement is TypeDefiningElement) { - result = _makeNonNullLiteralType(node); - } else if (staticElement is ExtensionElement) { - result = _makeNonNullLiteralType(node); - } else if (staticElement == null) { - assert(node.toString() == 'void', "${node.toString()} != 'void'"); - result = _makeNullableVoidType(node); - } else if (staticElement.enclosingElement is ClassElement && - staticElement.enclosingElement is EnumElement) { - result = getOrComputeElementType(node, staticElement); - } else { - // TODO(paulberry) - _unimplemented(node, - 'Simple identifier with a static element of type ${staticElement.runtimeType}'); - } - if (targetType != null) { - _checkThisNotNull(targetType, node); - } - return result; - } - - @override - DecoratedType? visitSpreadElement(SpreadElement node) { - final spreadType = node.expression.staticType!; - DecoratedType? spreadTypeDecorated; - var target = - NullabilityNodeTarget.text('spread element type').withCodeRef(node); - if (_typeSystem.isSubtypeOf(spreadType, typeProvider.mapObjectObjectType)) { - assert(_currentMapKeyType != null && _currentMapValueType != null); - final expectedType = typeProvider.mapType( - _currentMapKeyType!.type!, _currentMapValueType!.type!); - final expectedDecoratedType = DecoratedType.forImplicitType( - typeProvider, expectedType, _graph, target, - typeArguments: [_currentMapKeyType, _currentMapValueType]); - - spreadTypeDecorated = _handleAssignment(node.expression, - destinationType: expectedDecoratedType); - } else if (_typeSystem.isSubtypeOf( - spreadType, typeProvider.iterableDynamicType)) { - assert(_currentLiteralElementType != null); - final expectedType = - typeProvider.iterableType(_currentLiteralElementType!.type!); - final expectedDecoratedType = DecoratedType.forImplicitType( - typeProvider, expectedType, _graph, target, - typeArguments: [_currentLiteralElementType]); - - spreadTypeDecorated = _handleAssignment(node.expression, - destinationType: expectedDecoratedType); - } else { - // Downcast. We can't assume nullability here, so do nothing. - } - - if (!node.isNullAware) { - _checkExpressionNotNull(node.expression, sourceType: spreadTypeDecorated); - } - - return null; - } - - @override - DecoratedType visitStringLiteral(StringLiteral node) { - node.visitChildren(this); - return _makeNonNullLiteralType(node); - } - - @override - DecoratedType? visitSuperConstructorInvocation( - SuperConstructorInvocation node) { - var callee = node.staticElement!; - var target = NullabilityNodeTarget.text('super constructor invocation') - .withCodeRef(node); - var nullabilityNode = NullabilityNode.forInferredType(target); - var class_ = node.thisOrAncestorOfType()!; - var decoratedSupertype = _decoratedClassHierarchy!.getDecoratedSupertype( - class_.declaredElement!, callee.enclosingElement); - var typeArguments = decoratedSupertype.typeArguments; - Iterable typeArgumentTypes; - typeArgumentTypes = typeArguments.map((t) => t!.type); - var createdType = DecoratedType(callee.returnType, nullabilityNode, - typeArguments: typeArguments); - var calleeType = - getOrComputeElementType(node, callee, targetType: createdType); - var constructorTypeParameters = callee.enclosingElement.typeParameters; - - _handleInvocationArguments( - node, - node.argumentList.arguments, - null /*typeArguments*/, - typeArgumentTypes, - calleeType, - constructorTypeParameters); - return null; - } - - @override - DecoratedType? visitSuperExpression(SuperExpression node) { - return _thisOrSuper(node); - } - - @override - DecoratedType? visitSwitchStatement(SwitchStatement node) { - var scrutineeType = _dispatch(node.expression)!; - _flowAnalysis! - .switchStatement_expressionEnd(node, node.expression, scrutineeType); - var hasDefault = false; - for (var member in node.members) { - _postDominatedLocals.doScoped(action: () { - var hasLabel = member.labels.isNotEmpty; - _flowAnalysis!.switchStatement_beginAlternatives(); - _flowAnalysis!.switchStatement_beginAlternative(); - _flowAnalysis!.constantPattern_end(node.expression, scrutineeType, - patternsEnabled: false); - _flowAnalysis!.switchStatement_endAlternative(null, {}); - _flowAnalysis! - .switchStatement_endAlternatives(node, hasLabels: hasLabel); - if (member is SwitchCase) { - _dispatch(member.expression); - } else { - hasDefault = true; - } - _dispatchList(member.statements); - _flowAnalysis!.switchStatement_afterCase(); - }); - } - _flowAnalysis!.switchStatement_end(hasDefault); - return null; - } - - @override - DecoratedType visitSymbolLiteral(SymbolLiteral node) { - return _makeNonNullLiteralType(node); - } - - @override - DecoratedType? visitThisExpression(ThisExpression node) { - return _thisOrSuper(node); - } - - @override - DecoratedType visitThrowExpression(ThrowExpression node) { - _dispatch(node.expression); - // TODO(paulberry): do we need to check the expression type? I think not. - _flowAnalysis!.handleExit(); - var target = - NullabilityNodeTarget.text('throw expression').withCodeRef(node); - var nullabilityNode = NullabilityNode.forInferredType(target); - _graph.makeNonNullable(nullabilityNode, ThrowOrigin(source, node)); - return DecoratedType(node.staticType, nullabilityNode); - } - - @override - DecoratedType? visitTryStatement(TryStatement node) { - var finallyBlock = node.finallyBlock; - if (finallyBlock != null) { - _flowAnalysis!.tryFinallyStatement_bodyBegin(); - } - var catchClauses = node.catchClauses; - if (catchClauses.isNotEmpty) { - _flowAnalysis!.tryCatchStatement_bodyBegin(); - } - var body = node.body; - _dispatch(body); - if (catchClauses.isNotEmpty) { - _flowAnalysis!.tryCatchStatement_bodyEnd(body); - _dispatchList(catchClauses); - _flowAnalysis!.tryCatchStatement_end(); - } - if (finallyBlock != null) { - _flowAnalysis!.tryFinallyStatement_finallyBegin( - catchClauses.isNotEmpty ? node : body); - _dispatch(finallyBlock); - _flowAnalysis!.tryFinallyStatement_end(); - } - return null; - } - - @override - DecoratedType? visitVariableDeclarationList(VariableDeclarationList node) { - var parent = node.parent; - bool isTopLevel = - parent is FieldDeclaration || parent is TopLevelVariableDeclaration; - _dispatchList(node.metadata); - _dispatch(node.type); - for (var variable in node.variables) { - _dispatchList(variable.metadata); - var initializer = variable.initializer; - var declaredElement = variable.declaredElement!; - if (isTopLevel) { - assert(_flowAnalysis == null); - _createFlowAnalysis(variable, null); - } else { - assert(_flowAnalysis != null); - if (declaredElement is PromotableElement && - _variables.getLateHint(source, node) != null) { - _lateHintedLocals.add(declaredElement); - } - } - var type = _variables.decoratedElementType(declaredElement); - var enclosingElement = declaredElement.enclosingElement; - if (!declaredElement.isStatic && enclosingElement is ClassElement) { - var overriddenElements = _inheritanceManager.getOverridden2( - enclosingElement, - Name(enclosingElement.library.source.uri, declaredElement.name)); - for (var overriddenElement - in overriddenElements ?? []) { - _handleFieldOverriddenDeclaration( - variable, type, enclosingElement, overriddenElement); - } - if (!declaredElement.isFinal) { - var overriddenElements = _inheritanceManager.getOverridden2( - enclosingElement, - Name(enclosingElement.library.source.uri, - '${declaredElement.name}=')); - for (var overriddenElement - in overriddenElements ?? []) { - _handleFieldOverriddenDeclaration( - variable, type, enclosingElement, overriddenElement); - } - } - } - try { - if (declaredElement is PromotableElement) { - _flowAnalysis!.declare( - declaredElement, _variables.decoratedElementType(declaredElement), - initialized: initializer != null); - } - if (initializer == null) { - // For top level variables and static fields, we have to generate an - // implicit assignment of `null`. For instance fields, this is done - // when processing constructors. For local variables, this is done - // when processing variable reads (only if flow analysis indicates - // the variable isn't definitely assigned). - if (isTopLevel && - _variables.getLateHint(source, node) == null && - !(declaredElement is FieldElement && !declaredElement.isStatic)) { - _graph.makeNullable( - type.node, ImplicitNullInitializerOrigin(source, node)); - } - } else { - _handleAssignment(initializer, destinationType: type); - } - if (isTopLevel) { - _flowAnalysis!.finish(); - } - } finally { - if (isTopLevel) { - _flowAnalysis = null; - _assignedVariables = null; - } - } - } - - // Track post-dominators, except we cannot make hard edges to multi - // declarations. Consider: - // - // int? x = null, y = 0; - // y.toDouble(); - // - // We cannot make a hard edge from y to never in this case. - if (node.variables.length == 1) { - _postDominatedLocals.add(node.variables.single.declaredElement!); - } - - return null; - } - - @override - DecoratedType? visitWhileStatement(WhileStatement node) { - // Note: we do not create guards. A null check here is *very* unlikely to be - // unnecessary after analysis. - _flowAnalysis!.whileStatement_conditionBegin(node); - _checkExpressionNotNull(node.condition); - _flowAnalysis!.whileStatement_bodyBegin(node, node.condition); - _postDominatedLocals.doScoped(action: () => _dispatch(node.body)); - _flowAnalysis!.whileStatement_end(); - return null; - } - - void _addParametersToFlowAnalysis(FormalParameterList? parameters) { - if (parameters != null) { - for (var parameter in parameters.parameters) { - var declaredElement = parameter.declaredElement!; - // TODO(paulberry): `skipDuplicateCheck` is currently needed to work - // around a failure in api_test.dart; fix this. - _flowAnalysis!.declare( - declaredElement, _variables.decoratedElementType(declaredElement), - initialized: true, skipDuplicateCheck: true); - } - } - } - - /// Visits [expression] and generates the appropriate edge to assert that its - /// value is non-null. - /// - /// Returns the decorated type of [expression]. - DecoratedType _checkExpressionNotNull(Expression expression, - {DecoratedType? sourceType}) { - if (_isPrefix(expression)) { - throw ArgumentError('cannot check non-nullability of a prefix'); - } - sourceType ??= _dispatch(expression); - if (sourceType == null) { - throw StateError('No type computed for ${expression.runtimeType} ' - '(${expression.toSource()}) offset=${expression.offset}'); - } - var origin = _makeEdgeOrigin(sourceType, expression); - var hard = _shouldUseHardEdge(expression); - var edge = _graph.makeNonNullable(sourceType.node, origin, - hard: hard, guards: _guards); - if (origin is ExpressionChecksOrigin) { - origin.checks.edges[FixReasonTarget.root] = edge; - } - return sourceType; - } - - /// Generates the appropriate edge to assert that the value of `this` is - /// non-null. - void _checkThisNotNull(DecoratedType? thisType, AstNode node) { - // `this` can only be `null` in extensions, so if we're not in an extension, - // there's nothing to do. - if (_currentExtendedType == null) return; - var origin = ImplicitThisOrigin(source, node); - var hard = _postDominatedLocals.isInScope(_extensionThis); - _graph.makeNonNullable(thisType!.node, origin, hard: hard, guards: _guards); - } - - /// Computes the map to be stored in [_currentFieldFormals] while visiting the - /// constructor having the given [constructorElement]. - Map - _computeFieldFormalMap(ConstructorElement constructorElement) { - var result = {}; - for (var parameter in constructorElement.parameters) { - if (parameter is FieldFormalParameterElement) { - var getter = parameter.field?.getter; - if (getter != null) { - result[getter] = parameter; - } - } - } - return result; - } - - @override - void _connect(NullabilityNode? source, NullabilityNode? destination, - EdgeOrigin origin, FixReasonTarget? edgeTarget, - {bool hard = false, bool checkable = true}) { - var edge = _graph.connect(source, destination!, origin, - hard: hard, checkable: checkable, guards: _guards); - if (origin is ExpressionChecksOrigin) { - origin.checks.edges[edgeTarget] = edge; - } - } - - void _createFlowAnalysis(Declaration node, FormalParameterList? parameters) { - assert(_flowAnalysis == null); - assert(_assignedVariables == null); - _assignedVariables = - FlowAnalysisHelper.computeAssignedVariables(node, parameters); - // Note: we are using flow analysis to help us track true nullabilities; - // it's not necessary to replicate old bugs. So we pass `true` for - // `respectImplicitlyTypedVarInitializers`. - _flowAnalysis = FlowAnalysis( - DecoratedTypeOperations(_typeSystem, typeProvider, _variables, _graph), - _assignedVariables!, - respectImplicitlyTypedVarInitializers: true, - fieldPromotionEnabled: false); - if (parameters != null) { - for (var parameter in parameters.parameters) { - var declaredElement = parameter.declaredElement!; - _flowAnalysis!.declare( - declaredElement, _variables.decoratedElementType(declaredElement), - initialized: true); - } - } - } - - /// Creates a type that can be used to check that an expression's value is - /// non-nullable. - DecoratedType _createNonNullableType(Expression expression) { - var target = - NullabilityNodeTarget.text('expression type').withCodeRef(expression); - // Note: it's not necessary for the type to precisely match the type of the - // expression, since all we are going to do is cause a single graph edge to - // be built; it is sufficient to pass in any decorated type whose node is - // non-nullable. So we use `Object`. - var nullabilityNode = NullabilityNode.forInferredType(target); - _graph.makeNonNullableUnion( - nullabilityNode, NonNullableUsageOrigin(source, expression)); - return DecoratedType(typeProvider.objectType, nullabilityNode); - } - - DecoratedType _decorateUpperOrLowerBound(AstNode astNode, DartType? type, - DecoratedType left, DecoratedType right, bool isLUB, - {NullabilityNode? node}) { - var leftType = left.type; - var rightType = right.type; - if (leftType is TypeParameterType && leftType != type) { - // We are "unwrapping" a type parameter type to its bound. - final typeParam = leftType.element; - return _decorateUpperOrLowerBound( - astNode, - type, - left.substitute( - {typeParam: _variables.decoratedTypeParameterBound(typeParam)!}), - right, - isLUB, - node: node); - } - if (rightType is TypeParameterType && rightType != type) { - // We are "unwrapping" a type parameter type to its bound. - final typeParam = rightType.element; - return _decorateUpperOrLowerBound( - astNode, - type, - left, - right.substitute( - {typeParam: _variables.decoratedTypeParameterBound(typeParam)!}), - isLUB, - node: node); - } - - node ??= isLUB - ? NullabilityNode.forLUB(left.node, right.node) - : _nullabilityNodeForGLB(astNode, left.node, right.node); - - if (type is DynamicType || type is VoidType) { - return DecoratedType(type, node); - } else if (leftType!.isBottom) { - return right.withNode(node); - } else if (rightType!.isBottom) { - return left.withNode(node); - } else if (type is InterfaceType) { - if (type.typeArguments.isEmpty) { - return DecoratedType(type, node); - } else { - if (leftType.isDartCoreNull) { - assert(isLUB, "shouldn't be possible to get C from GLB(null, S)"); - return DecoratedType(type, node, typeArguments: right.typeArguments); - } else if (rightType.isDartCoreNull) { - assert(isLUB, "shouldn't be possible to get C from GLB(S, null)"); - return DecoratedType(type, node, typeArguments: left.typeArguments); - } else if (leftType is InterfaceType && rightType is InterfaceType) { - List leftTypeArguments; - List rightTypeArguments; - if (isLUB) { - leftTypeArguments = _decoratedClassHierarchy! - .asInstanceOf(left, type.element) - .typeArguments; - rightTypeArguments = _decoratedClassHierarchy! - .asInstanceOf(right, type.element) - .typeArguments; - } else { - if (leftType.element != type.element || - rightType.element != type.element) { - _unimplemented(astNode, 'GLB with substitution'); - } - leftTypeArguments = left.typeArguments; - rightTypeArguments = right.typeArguments; - } - List newTypeArguments = []; - for (int i = 0; i < type.typeArguments.length; i++) { - newTypeArguments.add(_decorateUpperOrLowerBound( - astNode, - type.typeArguments[i], - leftTypeArguments[i]!, - rightTypeArguments[i]!, - isLUB)); - } - return DecoratedType(type, node, typeArguments: newTypeArguments); - } else { - _unimplemented( - astNode, - 'LUB/GLB with unexpected types: ${leftType.runtimeType}/' - '${rightType.runtimeType}'); - } - } - } else if (type is FunctionType) { - var leftType = left.type!; - var rightType = right.type; - if (leftType.isDartCoreNull) { - assert( - isLUB, "shouldn't be possible to get a function from GLB(null, S)"); - return DecoratedType(type, node, - returnType: right.returnType, - positionalParameters: right.positionalParameters, - namedParameters: right.namedParameters); - } else if (rightType!.isDartCoreNull) { - assert( - isLUB, "shouldn't be possible to get a function from GLB(S, null)"); - return DecoratedType(type, node, - returnType: left.returnType, - positionalParameters: left.positionalParameters, - namedParameters: left.namedParameters); - } - if (leftType is FunctionType && rightType is FunctionType) { - var returnType = _decorateUpperOrLowerBound(astNode, type.returnType, - left.returnType!, right.returnType!, isLUB); - List positionalParameters = []; - Map namedParameters = {}; - int positionalParameterCount = 0; - for (var parameter in type.parameters) { - DecoratedType? leftParameterType; - DecoratedType? rightParameterType; - if (parameter.isNamed) { - leftParameterType = left.namedParameters![parameter.name]; - rightParameterType = right.namedParameters![parameter.name]; - } else { - leftParameterType = - left.positionalParameters![positionalParameterCount]; - rightParameterType = - right.positionalParameters![positionalParameterCount]; - positionalParameterCount++; - } - var decoratedParameterType = _decorateUpperOrLowerBound(astNode, - parameter.type, leftParameterType!, rightParameterType!, !isLUB); - if (parameter.isNamed) { - namedParameters[parameter.name] = decoratedParameterType; - } else { - positionalParameters.add(decoratedParameterType); - } - } - return DecoratedType(type, node, - returnType: returnType, - positionalParameters: positionalParameters, - namedParameters: namedParameters); - } else { - _unimplemented( - astNode, - 'LUB/GLB with unexpected types: ${leftType.runtimeType}/' - '${rightType.runtimeType}'); - } - } else if (type is TypeParameterType) { - var leftType = left.type!; - var rightType = right.type; - if (leftType.isDartCoreNull || rightType!.isDartCoreNull) { - assert(isLUB, "shouldn't be possible to get T from GLB(null, S)"); - return DecoratedType(type, node); - } - - assert(leftType.element == type.element && - rightType.element == type.element); - return DecoratedType(type, node); - } - _unimplemented(astNode, '_decorateUpperOrLowerBound'); - } - - DecoratedType? _dispatch(AstNode? node, {bool skipNullCheckHint = false}) { - try { - var type = node?.accept(this); - if (!skipNullCheckHint && node is Expression) { - type = _handleNullCheckHint(node, type); - } - return type; - } catch (exception, stackTrace) { - if (listener != null) { - listener!.reportException(source, node, exception, stackTrace); - return null; - } else { - rethrow; - } - } - } - - void _dispatchList(List? nodeList) { - if (nodeList == null) return; - for (var node in nodeList) { - _dispatch(node); - } - } - - /// If the innermost enclosing executable is a constructor with field formal - /// parameters, and [staticElement] refers to the getter associated with one - /// of those fields, returns the corresponding field formal parameter element. - /// Otherwise returns [staticElement] unchanged. - /// - /// This allows us to treat null checks on the field as though they were null - /// checks on the field formal parameter, which is not strictly correct, but - /// tends to produce migrations that are more in line with user intent. - Element? _favorFieldFormalElements(Element? staticElement) { - if (staticElement is PropertyAccessorElement) { - var fieldFormal = _currentFieldFormals[staticElement]; - if (fieldFormal != null) { - return fieldFormal; - } - } - return staticElement; - } - - DecoratedType _fixNumericTypes( - DecoratedType decoratedType, DartType? undecoratedType) { - if (decoratedType.type!.isDartCoreNum && undecoratedType!.isDartCoreInt) { - // In a few cases the type computed by normal method lookup is `num`, - // but special rules kick in to cause the type to be `int` instead. If - // that is the case, we need to fix up the decorated type. - return DecoratedType(undecoratedType, decoratedType.node); - } else { - return decoratedType; - } - } - - DecoratedType _futureOf(DecoratedType type, AstNode node) => - DecoratedType.forImplicitType( - typeProvider, - typeProvider.futureType(type.type!), - _graph, - NullabilityNodeTarget.text('implicit future').withCodeRef(node), - typeArguments: [type]); - - @override - DecoratedType? _getCallMethodType(DecoratedType type) { - var typeType = type.type; - if (typeType is InterfaceType) { - var callMethod = typeType.lookUpMethod2('call', _library); - if (callMethod != null) { - return _variables - .decoratedElementType(callMethod.declaration) - .substitute(type.asSubstitution); - } - } - return null; - } - - @override - DecoratedType? _getTypeParameterTypeBound(DecoratedType type) { - // TODO(paulberry): once we've wired up flow analysis, return promoted - // bounds if applicable. - return _variables - .decoratedTypeParameterBound((type.type as TypeParameterType).element); - } - - /// Creates the necessary constraint(s) for an assignment of the given - /// [expression] to a destination whose type is [destinationType]. - /// - /// Optionally, the caller may supply an [assignmentExpression] instead of - /// [destinationType]. In this case, then the type comes from visiting the - /// LHS of the assignment expression. If the LHS of the assignment expression - /// refers to a local variable, we mark it as assigned in flow analysis at the - /// proper time. - /// - /// Set [wrapFuture] to true to handle assigning Future to R. - DecoratedType? _handleAssignment(Expression expression, - {DecoratedType? destinationType, - AssignmentExpression? assignmentExpression, - AssignmentExpression? compoundOperatorInfo, - AssignmentExpression? questionAssignNode, - bool fromDefaultValue = false, - bool wrapFuture = false, - bool sourceIsSetupCall = false, - bool isInjectorGetAssignment = false}) { - assert( - (assignmentExpression == null) != (destinationType == null), - 'Either assignmentExpression or destinationType should be supplied, ' - 'but not both'); - PromotableElement? destinationLocalVariable; - if (destinationType == null) { - var destinationExpression = assignmentExpression!.leftHandSide; - if (destinationExpression is SimpleIdentifier) { - var element = getWriteOrReadElement(destinationExpression); - if (element is PromotableElement) { - destinationLocalVariable = element; - } - } - if (destinationLocalVariable != null) { - _dispatch(destinationExpression); - destinationType = getOrComputeElementType( - destinationExpression, destinationLocalVariable); - } else { - destinationType = _dispatch(destinationExpression); - } - } - if (sourceIsSetupCall && - isInjectorGetAssignment && - destinationType != null) { - _graph.makeNonNullable( - destinationType.node, - AssignmentFromAngularInjectorGetOrigin( - source, assignmentExpression!.leftHandSide as SimpleIdentifier, - isSetupAssignment: sourceIsSetupCall)); - } - - if (questionAssignNode != null) { - _guards.add(destinationType!.node); - _flowAnalysis!.ifNullExpression_rightBegin( - questionAssignNode.leftHandSide, destinationType); - } - DecoratedType? sourceType; - try { - sourceType = _dispatch(expression); - if (wrapFuture) { - sourceType = _wrapFuture(sourceType!, expression); - } - if (sourceType == null) { - throw StateError('No type computed for ${expression.runtimeType} ' - '(${expression.toSource()}) offset=${expression.offset}'); - } - EdgeOrigin edgeOrigin = _makeEdgeOrigin(sourceType, expression, - isSetupAssignment: sourceIsSetupCall); - if (compoundOperatorInfo != null) { - var compoundOperatorMethod = compoundOperatorInfo.staticElement; - if (compoundOperatorMethod != null) { - _checkAssignment( - CompoundAssignmentOrigin(source, compoundOperatorInfo), - FixReasonTarget.root, - source: destinationType!, - destination: _createNonNullableType(compoundOperatorInfo), - hard: _shouldUseHardEdge(assignmentExpression!.leftHandSide)); - DecoratedType compoundOperatorType = getOrComputeElementType( - compoundOperatorInfo, compoundOperatorMethod, - targetType: destinationType, - targetExpression: compoundOperatorInfo.leftHandSide); - assert(compoundOperatorType.positionalParameters!.isNotEmpty); - _checkAssignment(edgeOrigin, FixReasonTarget.root, - source: sourceType, - destination: compoundOperatorType.positionalParameters![0], - hard: _shouldUseHardEdge(expression), - sourceIsFunctionLiteral: expression is FunctionExpression); - sourceType = _fixNumericTypes(compoundOperatorType.returnType!, - compoundOperatorInfo.staticType); - _checkAssignment( - CompoundAssignmentOrigin(source, compoundOperatorInfo), - FixReasonTarget.root, - source: sourceType, - destination: destinationType, - hard: false); - } else { - sourceType = _makeNullableDynamicType(compoundOperatorInfo); - } - } else { - if (_tryTransformOrElse(expression, sourceType) || - _tryTransformWhere( - expression, edgeOrigin, sourceType, destinationType!)) { - // Nothing further to do. - } else { - var hard = _shouldUseHardEdge(expression, - isConditionallyExecuted: questionAssignNode != null); - _checkAssignment(edgeOrigin, FixReasonTarget.root, - source: sourceType, - destination: destinationType, - hard: hard, - sourceIsFunctionLiteral: expression is FunctionExpression); - } - } - if (destinationLocalVariable != null) { - _flowAnalysis!.write(assignmentExpression!, destinationLocalVariable, - sourceType, compoundOperatorInfo == null ? expression : null); - } - if (questionAssignNode != null) { - _flowAnalysis!.ifNullExpression_end(); - // a ??= b is only nullable if both a and b are nullable. - sourceType = destinationType!.withNode(_nullabilityNodeForGLB( - questionAssignNode, sourceType.node, destinationType.node)); - _variables.recordDecoratedExpressionType( - questionAssignNode, sourceType); - } - } finally { - if (questionAssignNode != null) { - _guards.removeLast(); - } - } - if (assignmentExpression != null) { - var element = _referencedElement(assignmentExpression.leftHandSide); - if (element != null) { - _postDominatedLocals.removeFromAllScopes(element); - _elementsWrittenToInLocalFunction?.add(element); - } - } - return sourceType; - } - - DecoratedType? _handleCollectionElement(CollectionElement? element) { - if (element is Expression) { - assert(_currentLiteralElementType != null); - return _handleAssignment(element, - destinationType: _currentLiteralElementType); - } else { - return _dispatch(element); - } - } - - void _handleConstructorRedirection( - FormalParameterList parameters, ConstructorName redirectedConstructor) { - var callee = redirectedConstructor.staticElement!.declaration; - var redirectedClass = callee.enclosingElement; - var calleeType = _variables.decoratedElementType(callee); - var typeArguments = redirectedConstructor.type.typeArguments; - var typeArgumentTypes = - typeArguments?.arguments.map((t) => t.type).toList(); - _handleInvocationArguments( - redirectedConstructor, - parameters.parameters, - typeArguments, - typeArgumentTypes, - calleeType, - redirectedClass.typeParameters); - } - - void _handleCustomCheckNotNull(MethodInvocation node) { - var callee = node.methodName.staticElement; - if (node.argumentList.arguments.isNotEmpty && - callee is ExecutableElement && - callee.isStatic) { - var enclosingElement = callee.enclosingElement; - if (enclosingElement is ClassElement) { - if (callee.name == 'checkNotNull' && - enclosingElement.name == 'ArgumentError' && - callee.library.isDartCore || - callee.name == 'checkNotNull' && - enclosingElement.name == 'BuiltValueNullFieldError' && - callee.library.source.uri.toString() == - 'package:built_value/built_value.dart') { - var argument = node.argumentList.arguments.first; - if (argument is SimpleIdentifier && _isReferenceInScope(argument)) { - var argumentType = _variables.decoratedElementType( - _favorFieldFormalElements(getWriteOrReadElement(argument))!); - _graph.makeNonNullable(argumentType.node, - ArgumentErrorCheckNotNullOrigin(source, argument)); - } - } - } - } - } - - void _handleExecutableDeclaration( - Declaration node, - ExecutableElement declaredElement, - NodeList metadata, - TypeAnnotation? returnType, - FormalParameterList? parameters, - NodeList? initializers, - FunctionBody body, - ConstructorName? redirectedConstructor) { - assert(_currentFunctionType == null); - assert(_currentFieldFormals.isEmpty); - assert(_currentExecutable == null); - _dispatchList(metadata); - _dispatch(returnType); - _createFlowAnalysis(node, parameters); - _dispatch(parameters); - - // Be over conservative with public methods' arguments: - // Unless we have reasons for non-nullability, assume they are nullable. - // Soft edge to `always` node does exactly this. - bool isOverride = false; - final thisClass = declaredElement.enclosingElement; - if (thisClass is InterfaceElement) { - final name = Name(thisClass.library.source.uri, declaredElement.name); - isOverride = _inheritanceManager.getOverridden2(thisClass, name) != null; - } - if (!isOverride && - declaredElement.isPublic && - declaredElement is! PropertyAccessorElement && - // operator == treats `null` specially. - !(declaredElement.isOperator && declaredElement.name == '==')) { - _makeArgumentsNullable(declaredElement, node); - } - _currentFunctionType = _variables.decoratedElementType(declaredElement); - _currentFieldFormals = declaredElement is ConstructorElement - ? _computeFieldFormalMap(declaredElement) - : const {}; - _currentExecutable = declaredElement; - _addParametersToFlowAnalysis(parameters); - // Push a scope of post-dominated declarations on the stack. - _postDominatedLocals.pushScope(elements: declaredElement.parameters); - if (declaredElement.enclosingElement is ExtensionElement) { - _postDominatedLocals.add(_extensionThis); - } - try { - _dispatchList(initializers); - if (declaredElement is ConstructorElement && - !declaredElement.isFactory && - declaredElement.redirectedConstructor == null) { - _handleUninitializedFields(node, _fieldsNotInitializedByConstructor!); - } - _dispatch(body); - if (redirectedConstructor != null) { - _handleConstructorRedirection(parameters!, redirectedConstructor); - } - if (declaredElement is! ConstructorElement) { - var enclosingElement = declaredElement.enclosingElement; - if (enclosingElement is ClassElement) { - var overriddenElements = _inheritanceManager.getOverridden2( - enclosingElement, - Name(enclosingElement.library.source.uri, declaredElement.name)); - for (var overriddenElement - in overriddenElements ?? []) { - _handleExecutableOverriddenDeclaration(node, returnType, parameters, - enclosingElement, overriddenElement); - } - if (declaredElement is PropertyAccessorElement) { - if (declaredElement.isGetter) { - var setters = [declaredElement.correspondingSetter]; - if (setters[0] == null && !declaredElement.isStatic) { - // No corresponding setter in this class; look for inherited - // setters. - var getterName = declaredElement.name; - var setterName = '$getterName='; - var inheritedMembers = _inheritanceManager.getOverridden2( - enclosingElement, - Name(enclosingElement.library.source.uri, setterName)); - if (inheritedMembers != null) { - setters = [ - for (var setter in inheritedMembers) - if (setter is PropertyAccessorElement) setter - ]; - } - } - for (var setter in setters) { - if (setter != null) { - _handleGetterSetterCorrespondence( - node, - declaredElement.isStatic ? null : enclosingElement, - declaredElement, - setter.declaration); - } - } - } else { - assert(declaredElement.isSetter); - assert(declaredElement.name.endsWith('=')); - var getters = [declaredElement.correspondingGetter]; - if (getters[0] == null && !declaredElement.isStatic) { - // No corresponding getter in this class; look for inherited - // getters. - var setterName = declaredElement.name; - var getterName = setterName.substring(0, setterName.length - 1); - var inheritedMembers = _inheritanceManager.getOverridden2( - enclosingElement, - Name(enclosingElement.library.source.uri, getterName)); - if (inheritedMembers != null) { - getters = [ - for (var getter in inheritedMembers) - if (getter is PropertyAccessorElement) getter - ]; - } - } - for (var getter in getters) { - if (getter != null) { - _handleGetterSetterCorrespondence( - node, - declaredElement.isStatic ? null : enclosingElement, - getter.declaration, - declaredElement); - } - } - } - } - } - } - _flowAnalysis!.finish(); - } finally { - _flowAnalysis = null; - _assignedVariables = null; - _currentFunctionType = null; - _currentFieldFormals = const {}; - _postDominatedLocals.popScope(); - _currentExecutable = null; - } - } - - void _handleExecutableOverriddenDeclaration( - Declaration node, - TypeAnnotation? returnType, - FormalParameterList? parameters, - ClassElement classElement, - Element overriddenElement) { - overriddenElement = overriddenElement.declaration!; - var overriddenClass = - overriddenElement.enclosingElement as InterfaceElement; - var decoratedSupertype = _decoratedClassHierarchy! - .getDecoratedSupertype(classElement, overriddenClass); - var substitution = decoratedSupertype.asSubstitution; - if (overriddenElement is PropertyAccessorElement && - overriddenElement.isSynthetic) { - assert(node is MethodDeclaration); - var method = node as MethodDeclaration; - var decoratedOverriddenField = - _variables.decoratedElementType(overriddenElement.variable); - var overriddenFieldType = - decoratedOverriddenField.substitute(substitution); - if (method.isGetter) { - _checkAssignment( - ReturnTypeInheritanceOrigin(source, node), FixReasonTarget.root, - source: _currentFunctionType!.returnType!, - destination: overriddenFieldType, - hard: true); - } else { - assert(method.isSetter); - DecoratedType currentParameterType = - _currentFunctionType!.positionalParameters!.single; - DecoratedType overriddenParameterType = overriddenFieldType; - _checkAssignment( - ParameterInheritanceOrigin(source, node), FixReasonTarget.root, - source: overriddenParameterType, - destination: currentParameterType, - hard: true); - } - } else { - var decoratedOverriddenFunctionType = - _variables.decoratedElementType(overriddenElement); - var overriddenFunctionType = - decoratedOverriddenFunctionType.substitute(substitution); - if (returnType == null) { - _linkDecoratedTypes( - _currentFunctionType!.returnType!, - overriddenFunctionType.returnType, - ReturnTypeInheritanceOrigin(source, node), - isUnion: false); - } else { - _checkAssignment( - ReturnTypeInheritanceOrigin(source, node), FixReasonTarget.root, - source: _currentFunctionType!.returnType!, - destination: overriddenFunctionType.returnType!, - hard: true); - } - if (parameters != null) { - int positionalParameterCount = 0; - for (var parameter in parameters.parameters) { - NormalFormalParameter normalParameter; - if (parameter is NormalFormalParameter) { - normalParameter = parameter; - } else { - normalParameter = (parameter as DefaultFormalParameter).parameter; - } - DecoratedType? currentParameterType; - DecoratedType? overriddenParameterType; - if (parameter.isNamed) { - var name = normalParameter.name!.lexeme; - currentParameterType = _currentFunctionType!.namedParameters![name]; - overriddenParameterType = - overriddenFunctionType.namedParameters![name]; - } else { - if (positionalParameterCount < - _currentFunctionType!.positionalParameters!.length) { - currentParameterType = _currentFunctionType! - .positionalParameters![positionalParameterCount]; - } - if (positionalParameterCount < - overriddenFunctionType.positionalParameters!.length) { - overriddenParameterType = overriddenFunctionType - .positionalParameters![positionalParameterCount]; - } - positionalParameterCount++; - } - if (overriddenParameterType != null) { - var origin = ParameterInheritanceOrigin(source, node); - if (_isUntypedParameter(normalParameter)) { - _linkDecoratedTypes( - overriddenParameterType, currentParameterType, origin, - isUnion: false); - } else { - _checkAssignment(origin, FixReasonTarget.root, - source: overriddenParameterType, - destination: currentParameterType!, - hard: false, - checkable: false); - } - } - } - } - } - } - - void _handleFieldOverriddenDeclaration( - VariableDeclaration node, - DecoratedType type, - ClassElement classElement, - Element overriddenElement) { - overriddenElement = overriddenElement.declaration!; - var overriddenClass = - overriddenElement.enclosingElement as InterfaceElement; - var decoratedSupertype = _decoratedClassHierarchy! - .getDecoratedSupertype(classElement, overriddenClass); - var substitution = decoratedSupertype.asSubstitution; - if (overriddenElement is PropertyAccessorElement) { - DecoratedType? unsubstitutedOverriddenType; - if (overriddenElement.isSynthetic) { - unsubstitutedOverriddenType = - _variables.decoratedElementType(overriddenElement.variable); - } else { - if (overriddenElement.isGetter) { - unsubstitutedOverriddenType = - _variables.decoratedElementType(overriddenElement).returnType; - } else { - unsubstitutedOverriddenType = _variables - .decoratedElementType(overriddenElement) - .positionalParameters![0]; - } - } - var overriddenType = - unsubstitutedOverriddenType!.substitute(substitution); - if (overriddenElement.isGetter) { - _checkAssignment( - ReturnTypeInheritanceOrigin(source, node), FixReasonTarget.root, - source: type, destination: overriddenType, hard: true); - } else { - assert(overriddenElement.isSetter); - _checkAssignment( - ParameterInheritanceOrigin(source, node), FixReasonTarget.root, - source: overriddenType, destination: type, hard: true); - } - } else { - assert(false, 'Field overrides non-property-accessor'); - } - } - - void _handleForLoopParts(AstNode node, ForLoopParts parts, AstNode body, - DecoratedType? Function(AstNode) bodyHandler) { - if (parts is ForParts) { - if (parts is ForPartsWithDeclarations) { - _dispatch(parts.variables); - } else if (parts is ForPartsWithExpression) { - var initializationType = _dispatch(parts.initialization); - if (initializationType != null) { - _graph.connectDummy( - initializationType.node, DummyOrigin(source, parts)); - } - } - _flowAnalysis!.for_conditionBegin(node); - if (parts.condition != null) { - _checkExpressionNotNull(parts.condition!); - } - _flowAnalysis! - .for_bodyBegin(node is Statement ? node : null, parts.condition); - } else if (parts is ForEachParts) { - Element? lhsElement; - DecoratedType? lhsType; - if (parts is ForEachPartsWithDeclaration) { - var variableElement = parts.loopVariable.declaredElement!; - _flowAnalysis!.declare( - variableElement, _variables.decoratedElementType(variableElement), - initialized: true); - lhsElement = variableElement; - _dispatch(parts.loopVariable.type); - lhsType = _variables.decoratedElementType(lhsElement); - } else if (parts is ForEachPartsWithIdentifier) { - lhsElement = parts.identifier.staticElement; - lhsType = _dispatch(parts.identifier); - } else { - throw StateError( - 'Unexpected ForEachParts subtype: ${parts.runtimeType}'); - } - var iterableType = _checkExpressionNotNull(parts.iterable); - DecoratedType? elementType; - if (lhsType != null) { - var iterableTypeType = iterableType.type!; - if (_typeSystem.isSubtypeOf( - iterableTypeType, typeProvider.iterableDynamicType)) { - elementType = _decoratedClassHierarchy! - .asInstanceOf(iterableType, typeProvider.iterableElement) - .typeArguments[0]; - _checkAssignment( - ForEachVariableOrigin(source, parts), FixReasonTarget.root, - source: elementType!, destination: lhsType, hard: false); - } - } - _flowAnalysis!.forEach_bodyBegin(node); - if (lhsElement is PromotableElement) { - _flowAnalysis!.write(node, lhsElement, - elementType ?? _makeNullableDynamicType(node), null); - } - } - - // The condition may fail/iterable may be empty, so the body gets a new - // post-dominator scope. - _postDominatedLocals.doScoped(action: () { - bodyHandler(body); - - if (parts is ForParts) { - _flowAnalysis!.for_updaterBegin(); - for (var updater in parts.updaters) { - var updaterType = _dispatch(updater)!; - _graph.connectDummy(updaterType.node, DummyOrigin(source, updater)); - } - _flowAnalysis!.for_end(); - } else { - _flowAnalysis!.forEach_end(); - } - }); - } - - void _handleGetterSetterCorrespondence(Declaration node, ClassElement? class_, - PropertyAccessorElement getter, PropertyAccessorElement setter) { - DecoratedType? getType; - if (getter.isSynthetic) { - var field = getter.variable; - if (field.isSynthetic) return; - getType = _variables.decoratedElementType(field); - } else { - getType = _variables.decoratedElementType(getter).returnType; - } - DecoratedType? setType; - if (setter.isSynthetic) { - var field = setter.variable; - if (field.isSynthetic) return; - setType = _variables.decoratedElementType(field); - } else { - setType = - _variables.decoratedElementType(setter).positionalParameters!.single; - } - Map getterSubstitution = const {}; - Map setterSubstitution = const {}; - if (class_ != null) { - var getterClass = getter.enclosingElement as InterfaceElement; - if (!identical(class_, getterClass)) { - getterSubstitution = _decoratedClassHierarchy! - .getDecoratedSupertype(class_, getterClass) - .asSubstitution; - } - var setterClass = setter.enclosingElement as InterfaceElement; - if (!identical(class_, setterClass)) { - setterSubstitution = _decoratedClassHierarchy! - .getDecoratedSupertype(class_, setterClass) - .asSubstitution; - } - } - _checkAssignment( - GetterSetterCorrespondenceOrigin(source, node), FixReasonTarget.root, - source: getType!.substitute(getterSubstitution), - destination: setType.substitute(setterSubstitution), - hard: true); - } - - /// Instantiate [type] with [argumentTypes], assigning [argumentTypes] to - /// [bounds]. - DecoratedType _handleInstantiation(DecoratedType type, - List argumentTypes, List edgeOrigins) { - for (var i = 0; i < argumentTypes.length; ++i) { - _checkAssignment( - edgeOrigins.elementAt(i), FixReasonTarget.root.typeArgument(i), - source: argumentTypes[i], - destination: DecoratedTypeParameterBounds.current! - .get((type.type as FunctionType).typeFormals[i])!, - hard: true); - } - - return type.instantiate(argumentTypes); - } - - /// Creates the necessary constraint(s) for an [ArgumentList] when invoking an - /// executable element whose type is [calleeType]. - /// - /// Only pass [typeArguments] or [typeArgumentTypes] depending on the use - /// case; only one will be used. - /// - /// Returns the decorated return type of the invocation, after any necessary - /// substitutions. - DecoratedType? _handleInvocationArguments( - AstNode node, - Iterable arguments, - TypeArgumentList? typeArguments, - Iterable? typeArgumentTypes, - DecoratedType calleeType, - List? constructorTypeParameters, - {DartType? invokeType}) { - var typeFormals = constructorTypeParameters ?? calleeType.typeFormals!; - var target = NullabilityNodeTarget.text('invocation').withCodeRef(node); - if (typeFormals.isNotEmpty) { - if (typeArguments != null) { - var argumentTypes = typeArguments.arguments - .map((t) => _variables.decoratedTypeAnnotation(source, t)) - .toList(); - var origins = typeArguments.arguments - .map((typeAnnotation) => - TypeParameterInstantiationOrigin(source, typeAnnotation)) - .toList(); - if (constructorTypeParameters != null) { - calleeType = calleeType.substitute( - Map.fromIterables( - constructorTypeParameters, argumentTypes)); - } else { - calleeType = _handleInstantiation(calleeType, argumentTypes, origins); - } - } else { - if (invokeType is FunctionType) { - var argumentTypes = typeArgumentTypes! - .map((argType) => DecoratedType.forImplicitType( - typeProvider, argType, _graph, target)) - .toList(); - instrumentation?.implicitTypeArguments(source, node, argumentTypes); - calleeType = _handleInstantiation( - calleeType, - argumentTypes, - List.filled(argumentTypes.length, - InferredTypeParameterInstantiationOrigin(source, node))); - } else if (constructorTypeParameters != null) { - // No need to instantiate; caller has already substituted in the - // correct type arguments. - } else { - assert( - false, - 'invoke type should be a non-null function type, or ' - 'dynamic/Function, which have no type arguments. ' - '(got $invokeType)'); - } - } - } - int i = 0; - var suppliedNamedParameters = {}; - for (var argument in arguments) { - String? name; - Expression expression; - if (argument is NamedExpression) { - name = argument.name.label.name; - expression = argument.expression; - } else if (argument is FormalParameter) { - if (argument.isNamed) { - name = argument.name!.lexeme; - } - // TODO(scheglov) This is a hack. - expression = (argument as FormalParameterImpl).identifierForMigration!; - } else { - expression = argument as Expression; - } - DecoratedType? parameterType; - if (name != null) { - parameterType = calleeType.namedParameters![name]; - if (parameterType == null) { - // TODO(paulberry) - _unimplemented(expression, 'Missing type for named parameter'); - } - suppliedNamedParameters.add(name); - } else { - if (calleeType.positionalParameters!.length <= i) { - // TODO(paulberry) - _unimplemented(node, 'Missing positional parameter at $i'); - } - parameterType = calleeType.positionalParameters![i++]; - } - _handleAssignment(expression, destinationType: parameterType); - } - // Any parameters not supplied must be optional. - for (var entry in calleeType.namedParameters!.entries) { - if (suppliedNamedParameters.contains(entry.key)) continue; - entry.value.node.recordNamedParameterNotSupplied( - _guards, _graph, NamedParameterNotSuppliedOrigin(source, node)); - } - return calleeType.returnType; - } - - DecoratedType? _handleNullAwareTarget(Expression? target, Expression node) { - var targetType = _dispatch(target); - if (target is SimpleIdentifier) { - var targetElement = target.staticElement; - if (targetElement is ParameterElement && - targetElement.enclosingElement == _currentExecutable && - !_currentExecutable!.name.startsWith('_')) { - _graph.makeNullable(_variables.decoratedElementType(targetElement).node, - NullAwareAccessOrigin(source, node)); - } - } - return targetType; - } - - DecoratedType? _handleNullCheckHint( - Expression expression, DecoratedType? type) { - // Sometimes we think we're looking at an expression but we're really not - // because we're inside a type name. If this happens, ignore trailing - // `/*!*/`s because they're not expression null check hints, they're type - // non-nullability hints (which are handled by NodeBuilder). - if (_typeNameNesting > 0) return type; - var token = expression.endToken; - if (_nullCheckHints.containsKey(token)) { - // Already visited this location. - return type; - } - var hint = _nullCheckHints[token] = getPostfixHint(token); - if (hint != null && hint.kind == HintCommentKind.bang) { - _variables.recordNullCheckHint(source, expression, hint); - return type!.withNode(_graph.never); - } else { - return type; - } - } - - DecoratedType? _handlePropertyAccess(Expression node, Expression? target, - SimpleIdentifier propertyName, bool isNullAware, bool isCascaded) { - if (!isCascaded && _isPrefix(target)) { - return _dispatch(propertyName, skipNullCheckHint: true); - } - var callee = getWriteOrReadElement(propertyName); - return _handlePropertyAccessGeneralized( - node: node, - target: target, - propertyName: propertyName.name, - isNullAware: isNullAware, - isCascaded: isCascaded, - inSetterContext: propertyName.inSetterContext(), - callee: callee); - } - - DecoratedType? _handlePropertyAccessGeneralized( - {required Expression node, - required Expression? target, - required String propertyName, - required bool isNullAware, - required bool isCascaded, - required bool inSetterContext, - required Element? callee}) { - DecoratedType? targetType; - bool calleeIsStatic = callee is ExecutableElement && callee.isStatic; - if (isCascaded) { - targetType = _currentCascadeTargetType; - } else if (calleeIsStatic) { - _dispatch(target); - } else if (isNullAware) { - targetType = _handleNullAwareTarget(target, node); - } else { - targetType = _handleTarget(target, propertyName, callee); - } - DecoratedType? calleeType; - if (targetType != null && - targetType.type is FunctionType && - propertyName == 'call') { - // If `X` has a function type, then in the expression `X.call`, the - // function being torn off is `X` itself, so the callee type is simply the - // non-nullable counterpart to the type of `X`. - var nullabilityNodeTarget = - NullabilityNodeTarget.text('expression').withCodeRef(node); - var nullabilityNode = - NullabilityNode.forInferredType(nullabilityNodeTarget); - _graph.makeNonNullableUnion( - nullabilityNode, CallTearOffOrigin(source, node)); - calleeType = targetType.withNode(nullabilityNode); - } else if (callee != null) { - calleeType = getOrComputeElementType(node, callee, - targetType: targetType, targetExpression: target); - } - if (calleeType == null) { - // Dynamic dispatch. - return _makeNullableDynamicType(node); - } - if (inSetterContext) { - if (isNullAware) { - _conditionalNodes[node] = targetType!.node; - } - return calleeType.positionalParameters![0]; - } else { - var expressionType = callee is PropertyAccessorElement - ? calleeType.returnType - : calleeType; - if (isNullAware) { - expressionType = expressionType!.withNode( - NullabilityNode.forLUB(targetType!.node, expressionType.node)); - _variables.recordDecoratedExpressionType(node, expressionType); - } - return expressionType; - } - } - - /// Check whether [node] is a call to the quiver package's [`checkNotNull`], - /// and if so, potentially mark the first argument as non-nullable. - /// - /// [`checkNotNull`]: https://pub.dev/documentation/quiver/latest/quiver.check/checkNotNull.html - void _handleQuiverCheckNotNull(MethodInvocation node) { - var callee = node.methodName.staticElement; - var calleeUri = callee?.library?.source.uri; - var isQuiverCheckNull = callee?.name == 'checkNotNull' && - calleeUri != null && - calleeUri.isScheme('package') && - calleeUri.path.startsWith('quiver/'); - - if (isQuiverCheckNull && node.argumentList.arguments.isNotEmpty) { - var argument = node.argumentList.arguments.first; - if (argument is SimpleIdentifier && _isReferenceInScope(argument)) { - var argumentType = - getOrComputeElementType(argument, argument.staticElement!); - _graph.makeNonNullable( - argumentType.node, QuiverCheckNotNullOrigin(source, argument)); - } - } - } - - DecoratedType? _handleTarget( - Expression? target, String name, Element? callee) { - if (isDeclaredOnObject(name)) { - return _dispatch(target); - } else if ((callee is MethodElement || callee is PropertyAccessorElement) && - callee!.enclosingElement is ExtensionElement) { - // Extension methods can be called on a `null` target, when the `on` type - // of the extension is nullable. Note: we don't need to check whether the - // target type is assignable to the extended type; that is done in - // [getOrComputeElementType]. - return _dispatch(target); - } else { - return _checkExpressionNotNull(target!); - } - } - - void _handleUninitializedFields(AstNode node, Set fields) { - for (var field in fields) { - _graph.makeNullable(_variables.decoratedElementType(field!).node, - FieldNotInitializedOrigin(source, node)); - } - } - - /// Returns whether [_currentFunctionExpression] is an argument to the test - /// package's `setUp` function. - bool _isCurrentFunctionExpressionFoundInTestSetUpCall() { - var parent = _currentFunctionExpression?.parent; - if (parent is ArgumentList) { - var grandParent = parent.parent; - if (grandParent is MethodInvocation) { - var enclosingInvocation = grandParent.methodName; - if (enclosingInvocation.name == 'setUp') { - var uri = enclosingInvocation.staticElement!.library?.source.uri; - if (uri != null && - uri.isScheme('package') && - uri.path.startsWith('test_core/')) { - return true; - } - } - } - } - return false; - } - - bool _isPrefix(Expression? e) => - e is SimpleIdentifier && e.staticElement is PrefixElement; - - bool _isReferenceInScope(Expression expression) { - var element = _referencedElement(expression); - return element != null && _postDominatedLocals.isInScope(element); - } - - bool _isUntypedParameter(NormalFormalParameter parameter) { - if (parameter is SimpleFormalParameter) { - return parameter.type == null; - } else if (parameter is FieldFormalParameter) { - return parameter.type == null; - } else { - return false; - } - } - - void _linkDecoratedTypeParameters( - DecoratedType x, DecoratedType? y, EdgeOrigin origin, - {bool isUnion = true}) { - for (int i = 0; - i < x.positionalParameters!.length && - i < y!.positionalParameters!.length; - i++) { - _linkDecoratedTypes( - x.positionalParameters![i], y.positionalParameters![i], origin, - isUnion: isUnion); - } - for (var entry in x.namedParameters!.entries) { - var superParameterType = y!.namedParameters![entry.key]; - if (superParameterType != null) { - _linkDecoratedTypes(entry.value, y.namedParameters![entry.key], origin, - isUnion: isUnion); - } - } - } - - void _linkDecoratedTypes(DecoratedType x, DecoratedType? y, EdgeOrigin origin, - {bool isUnion = true}) { - if (isUnion) { - _graph.union(x.node, y!.node, origin); - } else { - _graph.connect(x.node, y!.node, origin, hard: true); - } - _linkDecoratedTypeParameters(x, y, origin, isUnion: isUnion); - for (int i = 0; - i < x.typeArguments.length && i < y.typeArguments.length; - i++) { - _linkDecoratedTypes(x.typeArguments[i]!, y.typeArguments[i], origin, - isUnion: isUnion); - } - if (x.returnType != null && y.returnType != null) { - _linkDecoratedTypes(x.returnType!, y.returnType, origin, - isUnion: isUnion); - } - } - - void _makeArgumentsNullable( - ExecutableElement declaredElement, Declaration node) { - for (final p in declaredElement.parameters) { - if (p is! FieldFormalParameterElement && - p is! SuperFormalParameterElement && - p is! ConstVariableElement) { - final decoratedType = _variables.decoratedElementType(p); - if (decoratedType.type is TypeParameterType) continue; - _graph.makeNullable( - decoratedType.node, PublicMethodArgumentOrigin(source, node)); - } - } - } - - EdgeOrigin _makeEdgeOrigin(DecoratedType sourceType, Expression expression, - {bool isSetupAssignment = false}) { - if (sourceType.type is DynamicType) { - return DynamicAssignmentOrigin(source, expression, - isSetupAssignment: isSetupAssignment); - } else { - ExpressionChecksOrigin expressionChecksOrigin = ExpressionChecksOrigin( - source, expression, ExpressionChecks(), - isSetupAssignment: isSetupAssignment); - _variables.recordExpressionChecks( - source, expression, expressionChecksOrigin); - return expressionChecksOrigin; - } - } - - DecoratedType _makeNonNullableBoolType(Expression expression) { - assert(expression.staticType!.isDartCoreBool); - var target = - NullabilityNodeTarget.text('expression').withCodeRef(expression); - var nullabilityNode = NullabilityNode.forInferredType(target); - _graph.makeNonNullableUnion( - nullabilityNode, NonNullableBoolTypeOrigin(source, expression)); - return DecoratedType(typeProvider.boolType, nullabilityNode); - } - - DecoratedType _makeNonNullLiteralType(Expression expression, - {List typeArguments = const []}) { - var target = - NullabilityNodeTarget.text('expression').withCodeRef(expression); - var nullabilityNode = NullabilityNode.forInferredType(target); - _graph.makeNonNullableUnion( - nullabilityNode, LiteralOrigin(source, expression)); - return DecoratedType(expression.staticType, nullabilityNode, - typeArguments: typeArguments); - } - - DecoratedType _makeNullableDynamicType(AstNode astNode) { - var target = - NullabilityNodeTarget.text('dynamic type').withCodeRef(astNode); - var decoratedType = DecoratedType.forImplicitType( - typeProvider, typeProvider.dynamicType, _graph, target); - _graph.makeNullable( - decoratedType.node, AlwaysNullableTypeOrigin(source, astNode, false)); - return decoratedType; - } - - DecoratedType _makeNullableVoidType(SimpleIdentifier astNode) { - var target = NullabilityNodeTarget.text('void type').withCodeRef(astNode); - var decoratedType = DecoratedType.forImplicitType( - typeProvider, typeProvider.voidType, _graph, target); - _graph.makeNullable( - decoratedType.node, AlwaysNullableTypeOrigin(source, astNode, true)); - return decoratedType; - } - - NullabilityNode _nullabilityNodeForGLB( - AstNode astNode, NullabilityNode leftNode, NullabilityNode rightNode) { - var node = NullabilityNode.forGLB(); - var origin = GreatestLowerBoundOrigin(source, astNode); - _graph.connect(leftNode, node, origin, guards: [rightNode]); - _graph.connect(node, leftNode, origin); - _graph.connect(node, rightNode, origin); - return node; - } - - /// Returns the element referenced directly by [expression], if any; otherwise - /// returns `null`. - Element? _referencedElement(Expression expression) { - expression = expression.unParenthesized; - if (expression is SimpleIdentifier) { - return _favorFieldFormalElements(expression.staticElement); - } else if (expression is ThisExpression || expression is SuperExpression) { - return _extensionThis; - } else { - return null; - } - } - - /// Determines whether uses of [expression] should cause hard edges to be - /// created in the nullability graph. - /// - /// If [isConditionallyExecuted] is `true`, that indicates that [expression] - /// appears in a context where it might not get executed (e.g. on the RHS of - /// a `??=`). - bool _shouldUseHardEdge(Expression expression, - {bool isConditionallyExecuted = false}) { - expression = expression.unParenthesized; - if (expression is ListLiteral || expression is SetOrMapLiteral) { - // List, set, and map literals have either explicit or implicit type - // arguments. If supplying a nullable type for one of these type - // arguments would lead to an error (e.g. `f([])` where `f` requires - // a `List`), then we should use a hard edge, to ensure that the - // migrated type argument will be non-nullable. - return true; - } else if (expression is AsExpression) { - // "as" expressions have an explicit type. If making this type nullable - // would lead to an error (e.g. `f(x as int?)` where `f` requires an - // `int`),then we should use a hard edge, to ensure that the migrated type - // will be non-nullable. - return true; - } - // For other expressions, we should use a hard edge only if (a) the - // expression is unconditionally executed, and (b) the expression is a - // reference to a local variable or parameter and it post-dominates the - // declaration of that local variable or parameter. - return !isConditionallyExecuted && _isReferenceInScope(expression); - } - - DecoratedType? _thisOrSuper(Expression node) { - if (_currentInterfaceOrExtension == null) { - return null; - } - - NullabilityNode makeNonNullableNode(NullabilityNodeTarget target) { - var nullabilityNode = NullabilityNode.forInferredType(target); - _graph.makeNonNullableUnion(nullabilityNode, - ThisOrSuperOrigin(source, node, node is ThisExpression)); - return nullabilityNode; - } - - var token = node.beginToken.lexeme; - var target = - NullabilityNodeTarget.text('$token expression').withCodeRef(node); - if (_currentInterfaceOrExtension is InterfaceElement) { - final type = (_currentInterfaceOrExtension as InterfaceElement).thisType; - - // Instantiate the type, and any type arguments, with non-nullable types, - // because the type of `this` is always `ClassName` - // with no `?`s. (Even if some of the type parameters are allowed to be - // instantiated with nullable types at runtime, a reference to `this` - // can't be migrated in such a way that forces them to be nullable.) - var index = 0; - return DecoratedType(type, makeNonNullableNode(target), - typeArguments: type.typeArguments - .map((t) => DecoratedType( - t, makeNonNullableNode(target.typeArgument(index++)))) - .toList()); - } else { - assert(_currentInterfaceOrExtension is ExtensionElement); - assert(_currentExtendedType != null); - return _currentExtendedType; - } - } - - /// If [node] is an `orElse` argument to an iterable method that should be - /// transformed, performs the necessary assignment checks on the expression - /// type and returns `true` (this indicates to the caller that no further - /// assignment checks need to be performed); otherwise returns `false`. - bool _tryTransformOrElse(Expression? expression, DecoratedType sourceType) { - var transformationInfo = - _whereOrNullTransformer.tryTransformOrElseArgument(expression); - if (transformationInfo != null) { - // Don't build any edges for this argument; if necessary we'll transform - // it rather than make things nullable. But do save the nullability of - // the return value of the `orElse` method, so that we can later connect - // it to the nullability of the value returned from the method - // invocation. - var extraNullability = sourceType.returnType!.node; - _deferredMethodInvocationProcessing[transformationInfo.methodInvocation] = - (methodInvocationType) { - var newNode = NullabilityNode.forInferredType( - NullabilityNodeTarget.text( - 'return value from ${transformationInfo.originalName}')); - var origin = IteratorMethodReturnOrigin( - source, transformationInfo.methodInvocation); - _graph.connect(methodInvocationType!.node, newNode, origin); - _graph.connect(extraNullability, newNode, origin); - return methodInvocationType.withNode(newNode); - }; - return true; - } else { - return false; - } - } - - /// If [node] is a call to `Iterable.where` that should be transformed, - /// performs the necessary assignment checks on the expression type and - /// returns `true` (this indicates to the caller that no further assignment - /// checks need to be performed); otherwise returns `false`. - bool _tryTransformWhere(Expression? expression, EdgeOrigin edgeOrigin, - DecoratedType sourceType, DecoratedType destinationType) { - var transformationInfo = - _whereNotNullTransformer.tryTransformMethodInvocation(expression); - if (transformationInfo != null) { - _checkAssignment(edgeOrigin, FixReasonTarget.root, - source: _whereNotNullTransformer.transformDecoratedInvocationType( - sourceType, _graph), - destination: destinationType, - hard: false); - return true; - } else { - return false; - } - } - - Never _unimplemented(AstNode? node, String message) { - StringBuffer buffer = StringBuffer(); - buffer.write(message); - if (node != null) { - CompilationUnit unit = node.root as CompilationUnit; - buffer.write(' in "'); - buffer.write(node.toSource()); - buffer.write('" on line '); - buffer.write(unit.lineInfo.getLocation(node.offset).lineNumber); - buffer.write(' of "'); - buffer.write(unit.declaredElement!.source.fullName); - buffer.write('"'); - } - throw UnimplementedError(buffer.toString()); - } - - /// Produce Future for some T, however, we would like to merely - /// upcast T to that type if possible, skipping the flatten when not - /// necessary. - DecoratedType _wrapFuture(DecoratedType type, AstNode? node) { - var dartType = type.type!; - if (dartType.isDartCoreNull || dartType.isBottom) { - return _futureOf(type, node!); - } - - if (dartType is InterfaceType && - dartType.element == typeProvider.futureOrElement) { - var typeArguments = type.typeArguments; - if (typeArguments.length == 1) { - // Wrapping FutureOr?2 should produce Future, where either 1 - // or 2 being nullable causes 3 to become nullable. - var typeArgument = typeArguments[0]!; - return _futureOf( - typeArgument - .withNode(NullabilityNode.forLUB(typeArgument.node, type.node)), - node!); - } - } - - if (_typeSystem.isSubtypeOf(dartType, typeProvider.futureDynamicType)) { - return _decoratedClassHierarchy! - .asInstanceOf(type, typeProvider.futureElement); - } - - return _futureOf(type, node!); - } - - /// If the [node] is the finishing identifier of an assignment, return its - /// "writeElement", otherwise return its "staticElement", which might be - /// thought as the "readElement". - static Element? getWriteOrReadElement(AstNode node) { - var writeElement = _getWriteElement(node); - if (writeElement != null) { - return writeElement; - } - - if (node is IndexExpression) { - return node.staticElement; - } else if (node is SimpleIdentifier) { - return node.staticElement; - } else { - return null; - } - } - - /// If the [node] is the target of a [CompoundAssignmentExpression], - /// return the corresponding "writeElement", which is the local variable, - /// the setter referenced with a [SimpleIdentifier] or a [PropertyAccess], - /// or the `[]=` operator. - static Element? _getWriteElement(AstNode node) { - var parent = node.parent; - if (parent is AssignmentExpression && parent.leftHandSide == node) { - return parent.writeElement; - } else if (parent is PostfixExpression) { - return parent.writeElement; - } else if (parent is PrefixExpression) { - return parent.writeElement; - } - - if (parent is PrefixedIdentifier && parent.identifier == node) { - return _getWriteElement(parent); - } else if (parent is PropertyAccess && parent.propertyName == node) { - return _getWriteElement(parent); - } else { - return null; - } - } - - /// Whether `expression` is a call to Angular's [Injector.get], with exactly - /// one argument. - static bool _isInjectorGetCall(Expression expression) { - if (expression is! MethodInvocation) { - return false; - } - - if (expression.methodName.name != 'get') { - return false; - } - if (expression.argumentList.arguments.length != 1) { - // If a second argument is passed, which may indicate that a non-null - // value isn't necessarily expected, don't count this call. - return false; - } - - var target = expression.target; - if (target is! Identifier) { - return false; - } - - var receiver = target.staticType?.element; - if (receiver?.name != 'Injector') { - return false; - } - - var uri = receiver?.library?.source.uri; - return uri != null && - uri.isScheme('package') && - uri.path.startsWith('angular/'); - } -} - -/// Implementation of [_checkAssignment] for [EdgeBuilder]. -/// -/// This has been moved to its own mixin to allow it to be more easily unit -/// tested. -mixin _AssignmentChecker { - TypeProvider get typeProvider; - - DecoratedClassHierarchy? get _decoratedClassHierarchy; - - TypeSystem get _typeSystem; - - /// Creates the necessary constraint(s) for an assignment from [source] to - /// [destination]. [origin] should be used as the origin for any edges - /// created. [hard] indicates whether a hard edge should be created. - /// [sourceIsFunctionLiteral] indicates whether the source of the assignment - /// is a function literal expression. - void _checkAssignment(EdgeOrigin origin, FixReasonTarget edgeTarget, - {required DecoratedType source, - required DecoratedType destination, - required bool hard, - bool checkable = true, - bool sourceIsFunctionLiteral = false}) { - var sourceType = source.type!; - var destinationType = destination.type!; - if (!_typeSystem.isSubtypeOf(sourceType, destinationType)) { - // Not a proper upcast assignment. - if (_typeSystem.isSubtypeOf(destinationType, sourceType)) { - // But rather a downcast. - _checkDowncast(origin, - source: source, destination: destination, hard: hard); - return; - } - if (destinationType is FunctionType) { - var callMethodType = _getCallMethodType(source); - if (callMethodType != null) { - // Handle implicit `.call` coercion - _checkAssignment(origin, edgeTarget, - source: callMethodType, - destination: destination, - hard: false, - checkable: false, - sourceIsFunctionLiteral: sourceIsFunctionLiteral); - return; - } - } - // A side cast. This may be an explicit side cast, or illegal code. There - // is no nullability we can infer here. - assert( - _assumeNonNullabilityInCasts, - 'side cast not supported without assuming non-nullability:' - ' $sourceType to $destinationType'); - _connect(source.node, destination.node, origin, edgeTarget, hard: hard); - return; - } - _connect(source.node, destination.node, origin, edgeTarget, - hard: hard, checkable: checkable); - _checkAssignment_recursion(origin, edgeTarget, - source: source, - destination: destination, - sourceIsFunctionLiteral: sourceIsFunctionLiteral, - hard: hard); - } - - /// Does the recursive part of [_checkAssignment], visiting all of the types - /// constituting [source] and [destination], and creating the appropriate - /// edges between them. [sourceIsFunctionLiteral] indicates whether the - /// source of the assignment is a function literal expression. - void _checkAssignment_recursion(EdgeOrigin origin, FixReasonTarget edgeTarget, - {required DecoratedType source, - required DecoratedType destination, - bool sourceIsFunctionLiteral = false, - bool hard = false}) { - var sourceType = source.type!; - var destinationType = destination.type!; - assert(_typeSystem.isSubtypeOf(sourceType, destinationType)); - if (destinationType.isDartAsyncFutureOr) { - var s1 = destination.typeArguments[0]; - if (sourceType.isDartAsyncFutureOr) { - // This is a special case not in the subtyping spec. The subtyping spec - // covers this case by expanding the LHS first, which is fine but - // leads to redundant edges (which might be confusing for users) - // if T0 is FutureOr then: - // - T0 <: T1 iff Future <: T1 and S0 <: T1 - // Since T1 is FutureOr, this is equivalent to: - // - T0 <: T1 iff (Future <: Future or Future <: S1) and - // (S0 <: Future or S0 <: S1) - // Which is equivalent to: - // - T0 <: T1 iff (S0 <: S1 or Future <: S1) and - // (S0 <: Future or S0 <: S1) - // Which is equivalent to (distributing the "and"): - // - T0 <: T1 iff (S0 <: S1 and (S0 <: Future or S0 <: S1)) or - // (Future <: S1 and (S0 <: Future or S0 <: S1)) - // Which is equivalent to (distributing the "and"s): - // - T0 <: T1 iff (S0 <: S1 and S0 <: Future) or - // (S0 <: S1 and S0 <: S1) or - // (Future <: S1 and S0 <: Future) or - // (Future <: S1 and S0 <: S1) - // If S0 <: S1, the relation is satisfied. Otherwise the only term that - // matters is (Future <: S1 and S0 <: Future), so this is - // equivalent to: - // - T0 <: T1 iff S0 <: S1 or (Future <: S1 and S0 <: Future) - // Let's consider whether there are any cases where the RHS of this "or" - // can be satisfied but not the LHS. That is, assume that - // Future <: S1 and S0 <: Future hold, but not S0 <: S1. S1 - // must not be a top type (otherwise S0 <: S1 would hold), so the only - // way Future <: S1 can hold is if S1 is Future or FutureOr - // for some A. In either case, Future simplifies to Future, so - // we know that S0 <: Future. Also, in either case, Future <: S1. - // Combining these, we have that S0 <: S1, contradicting our assumption. - // So the RHS of the "or" is redundant, and we can simplify to: - // - S0 <: S1. - var s0 = source.typeArguments[0]!; - _checkAssignment(origin, edgeTarget.yieldedType, - source: s0, destination: s1!, hard: false); - return; - } - // (From the subtyping spec): - // if T1 is FutureOr then T0 <: T1 iff any of the following hold: - // - either T0 <: Future - if (_typeSystem.isSubtypeOf( - sourceType, typeProvider.futureType(s1!.type!))) { - // E.g. FutureOr = (... as Future) - // This is handled by the InterfaceType logic below, since we treat - // FutureOr as a supertype of Future. - } - // - or T0 <: S1 - else if (_typeSystem.isSubtypeOf(sourceType, s1.type!)) { - // E.g. FutureOr = (... as int) - _checkAssignment_recursion(origin, edgeTarget.yieldedType, - source: source, destination: s1); - return; - } - // - or T0 is X0 and X0 has bound S0 and S0 <: T1 - // - or T0 is X0 & S0 and S0 <: T1 - else if (sourceType is TypeParameterType) { - throw UnimplementedError('TODO(paulberry)'); - } else { - // Not a subtype. This should never happen, since we handle the - // implicit downcast case above. - assert(false, 'not a subtype'); - } - } - if (sourceType.isBottom || sourceType.isDartCoreNull) { - // No further edges need to be created, since all types are trivially - // supertypes of bottom (and of Null, in the pre-migration world). - } else if (sourceType is TypeParameterType) { - // Handle this before handling dynamic/object/void, to correctly infer - // nullabilities in `Object o = T`. - if (destinationType is TypeParameterType) { - // No further edges need to be created, since type parameter types - // aren't made up of other types. - } else { - // Effectively this is an assignment from the type parameter's bound to - // the destination type. - _checkAssignment(origin, edgeTarget, - source: _getTypeParameterTypeBound(source)!, - destination: destination, - hard: false); - return; - } - } else if (destinationType is DynamicType || - destinationType is VoidType || - destinationType.isDartCoreObject) { - // No further edges need to be created, since all types are trivially - // subtypes of dynamic, Object, and void, since all are treated as - // equivalent to dynamic for subtyping purposes. - } else if (sourceType is InterfaceType && - destinationType is InterfaceType) { - var rewrittenSource = _decoratedClassHierarchy! - .asInstanceOf(source, destinationType.element); - assert(rewrittenSource.typeArguments.length == - destination.typeArguments.length); - for (int i = 0; i < rewrittenSource.typeArguments.length; i++) { - _checkAssignment(origin, edgeTarget.typeArgument(i), - source: rewrittenSource.typeArguments[i]!, - destination: destination.typeArguments[i]!, - hard: hard, - checkable: false); - } - } else if (sourceType is FunctionType && destinationType is FunctionType) { - // If the source is a function literal, we want a hard edge, so that if a - // function returning non-null is required, we will insure that the - // function literal has a non-nullable return type (e.g. by inserting null - // checks into the function literal). - _checkAssignment(origin, edgeTarget.returnType, - source: source.returnType!, - destination: destination.returnType!, - hard: sourceIsFunctionLiteral, - checkable: false); - if (source.typeArguments.isNotEmpty || - destination.typeArguments.isNotEmpty) { - throw UnimplementedError('TODO(paulberry)'); - } - for (int i = 0; - i < source.positionalParameters!.length && - i < destination.positionalParameters!.length; - i++) { - // Note: source and destination are swapped due to contravariance. - _checkAssignment(origin, edgeTarget.positionalParameter(i), - source: destination.positionalParameters![i], - destination: source.positionalParameters![i], - hard: false, - checkable: false); - } - for (var entry in destination.namedParameters!.entries) { - // Note: source and destination are swapped due to contravariance. - _checkAssignment(origin, edgeTarget.namedParameter(entry.key), - source: entry.value, - destination: source.namedParameters![entry.key]!, - hard: false, - checkable: false); - } - } else if (destinationType is DynamicType || sourceType is DynamicType) { - // ok; nothing further to do. - } else if (destinationType is InterfaceType && sourceType is FunctionType) { - // Either this is an upcast to Function or Object, or it is erroneous - // code. In either case we don't need to create any additional edges. - } else { - throw '$destination <= $source'; // TODO(paulberry) - } - } - - void _checkDowncast(EdgeOrigin origin, - {required DecoratedType source, - required DecoratedType destination, - required bool hard}) { - var destinationType = destination.type!; - final sourceType = source.type!; - assert(_typeSystem.isSubtypeOf(destinationType, sourceType)); - // Nullability should narrow to maintain subtype relationship. - _connect(source.node, destination.node, origin, FixReasonTarget.root, - hard: hard); - - if (sourceType is DynamicType || - sourceType.isDartCoreObject || - sourceType is VoidType) { - if (destinationType is InterfaceType) { - for (final param in destinationType.element.typeParameters) { - assert(param.bound == null, - 'downcast to type parameters with bounds not supported'); - } - } - if (destinationType is FunctionType) { - // Nothing else to do. - return; - } - } else if (destinationType.isDartCoreNull) { - // There's not really much we can infer from trying to assign a type to - // Null. We could say that the source of the assignment must be nullable, - // but that's not really useful because the nullability won't propagate - // anywhere. Besides, the code is probably erroneous (e.g. the user is - // trying to store a value into a `List`). So do nothing. - return; - } else if (destinationType is TypeParameterType) { - if (sourceType is! TypeParameterType) { - // Assume an assignment to the type parameter's bound. - _checkAssignment(origin, FixReasonTarget.root, - source: source, - destination: _getTypeParameterTypeBound(destination)!, - hard: false); - } else if (destinationType == sourceType) { - // Nothing to do. - return; - } - } else if (sourceType.isDartAsyncFutureOr) { - if (destination.type!.isDartAsyncFuture) { - // FutureOr is nullable, so the Future should be nullable too. - _connect(source.typeArguments[0]!.node, destination.node, origin, - FixReasonTarget.root.yieldedType, - hard: hard); - _checkDowncast(origin, - source: source.typeArguments[0]!, - destination: destination.typeArguments[0]!, - hard: false); - } else if (destination.type!.isDartAsyncFutureOr) { - _checkDowncast(origin, - source: source.typeArguments[0]!, - destination: destination.typeArguments[0]!, - hard: false); - } else { - _checkDowncast(origin, - source: source.typeArguments[0]!, - destination: destination, - hard: false); - } - } else if (destinationType is InterfaceType) { - if (sourceType is InterfaceType) { - final target = _decoratedClassHierarchy! - .asInstanceOf(destination, sourceType.element); - for (var i = 0; i < source.typeArguments.length; ++i) { - _checkDowncast(origin, - source: source.typeArguments[i]!, - destination: target.typeArguments[i]!, - hard: false); - } - } else { - assert(false, - 'downcasting from ${sourceType.runtimeType} to interface type'); - } - } else if (destinationType is FunctionType) { - if (sourceType.isDartCoreFunction) { - // Nothing else to do. - return; - } - } else { - assert( - false, - 'downcasting from ${sourceType.runtimeType} to ' - '${destinationType.runtimeType} not supported. ($sourceType $destinationType)'); - } - } - - void _connect(NullabilityNode? source, NullabilityNode? destination, - EdgeOrigin origin, FixReasonTarget edgeTarget, - {bool hard = false, bool checkable = true}); - - /// If [type] represents a class containing a `call` method, returns the - /// decorated type of the `call` method, with appropriate substitutions. - /// Otherwise returns `null`. - DecoratedType? _getCallMethodType(DecoratedType type); - - /// Given a [type] representing a type parameter, retrieves the type's bound. - DecoratedType? _getTypeParameterTypeBound(DecoratedType type); -} - -/// Information about a binary expression whose boolean value could possibly -/// affect nullability analysis. -class _ConditionInfo { - /// The [expression] of interest. - final Expression condition; - - /// Indicates whether [condition] is pure (free from side effects). - /// - /// For example, a condition like `x == null` is pure (assuming `x` is a local - /// variable or static variable), because evaluating it has no user-visible - /// effect other than returning a boolean value. - final bool isPure; - - /// Indicates whether the intents postdominate the intent node declarations. - final bool? postDominatingIntent; - - /// If not `null`, the [NullabilityNode] that would need to be nullable in - /// order for [condition] to evaluate to `true`. - final NullabilityNode? trueGuard; - - /// If not `null`, the [NullabilityNode] that would need to be nullable in - /// order for [condition] to evaluate to `false`. - final NullabilityNode? falseGuard; - - /// If not `null`, the [NullabilityNode] that should be asserted to have - /// non-null intent if [condition] is asserted to be `true`. - final NullabilityNode? trueDemonstratesNonNullIntent; - - /// If not `null`, the [NullabilityNode] that should be asserted to have - /// non-null intent if [condition] is asserted to be `false`. - final NullabilityNode? falseDemonstratesNonNullIntent; - - _ConditionInfo(this.condition, - {required this.isPure, - this.postDominatingIntent, - this.trueGuard, - this.falseGuard, - this.trueDemonstratesNonNullIntent, - this.falseDemonstratesNonNullIntent}); - - /// Returns a new [_ConditionInfo] describing the boolean "not" of `this`. - _ConditionInfo not(Expression condition) => _ConditionInfo(condition, - isPure: isPure, - postDominatingIntent: postDominatingIntent, - trueGuard: falseGuard, - falseGuard: trueGuard, - trueDemonstratesNonNullIntent: falseDemonstratesNonNullIntent, - falseDemonstratesNonNullIntent: trueDemonstratesNonNullIntent); -} - -extension on DartType? { - DartType? get explicitBound { - final self = this; - if (self is TypeParameterType && - self.nullabilitySuffix == NullabilitySuffix.star) { - return self.element.bound.explicitBound; - } - return self; - } -} diff --git a/pkg/nnbd_migration/lib/src/edge_origin.dart b/pkg/nnbd_migration/lib/src/edge_origin.dart deleted file mode 100644 index 426801d7d9ea..000000000000 --- a/pkg/nnbd_migration/lib/src/edge_origin.dart +++ /dev/null @@ -1,780 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:nnbd_migration/instrumentation.dart'; - -/// Edge origin resulting from a type in already-migrated code. -/// -/// For example, in the Map class in dart:core: -/// V? operator [](Object key); -/// -/// this class is used for the edge connecting `always` to the return type of -/// `operator []`, due to the fact that dart:core has already been migrated and -/// the type is explicitly nullable. -/// -/// Note that since a single element can have a complex type, it is likely that -/// multiple edges will be created with an [AlreadyMigratedTypeOrigin] pointing -/// to the same type. To distinguish which edge corresponds to which part of -/// the element's type, use the callbacks -/// [NullabilityMigrationInstrumentation.externalDecoratedType] and -/// [NullabilityMigrationInstrumentation.externalDecoratedTypeParameterBound]. -class AlreadyMigratedTypeOrigin extends EdgeOrigin { - /// Indicates whether the already-migrated type is nullable or not. - final bool isNullable; - - AlreadyMigratedTypeOrigin.forElement(Element super.element, this.isNullable) - : super.forElement(); - - @override - String get description => '${isNullable ? 'nullable' : 'non-nullable'}' - ' type in already-migrated code'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.alreadyMigratedType; -} - -/// Edge origin resulting from the use of a type that is always nullable. -/// -/// For example, in the following code snippet: -/// void f(dynamic x) {} -/// -/// this class is used for the edge connecting `always` to the type of f's `x` -/// parameter, due to the fact that the `dynamic` type is always considered -/// nullable. -class AlwaysNullableTypeOrigin extends EdgeOrigin { - /// Indicates whether the always-nullable type is the `void` type (if `false`, - /// it is the `dynamic` type). - final bool isVoid; - - AlwaysNullableTypeOrigin(super.source, AstNode super.node, this.isVoid); - - AlwaysNullableTypeOrigin.forElement(Element super.element, this.isVoid) - : super.forElement(); - - @override - String get description => - '${isVoid ? 'void' : 'dynamic'} type is nullable by definition'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.alwaysNullableType; -} - -/// Edge origin resulting from the presence of an Angular annotation such as -/// `@Optional()`, `@Attribute(...)`, `@ViewChild(...)`, or `@ContentChild(...)`. -class AngularAnnotationOrigin extends EdgeOrigin { - AngularAnnotationOrigin(super.source, AstNode super.node); - - @override - String get description => - 'annotated with an Angular annotation indicating nullability'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.angularAnnotation; -} - -/// Edge origin resulting from `@Component(...)` or `@Injectable()` class -/// constructor arguments having neither `@Optional()` nor `@Attribute()` -/// annotation. -class AngularConstructorArgumentOrigin extends EdgeOrigin { - AngularConstructorArgumentOrigin(super.source, AstNode super.node); - - @override - String get description => - 'Component or @Injectable() class constructor arguments without' - ' @Optional/@Attribute annotations must be non-nullable'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.angularConstructorArgument; -} - -/// Edge origin resulting from the presence of a call to -/// `ArgumentError.checkNotNull`. -/// -/// For example, in the following code snippet: -/// void f(int i) { -/// ArgumentError.checkNotNull(i); -/// } -/// -/// this class is used for the edge connecting the type of f's `i` parameter to -/// `never`, due to the `checkNotNull` call proclaiming that `i` is not `null`. -class ArgumentErrorCheckNotNullOrigin extends EdgeOrigin { - ArgumentErrorCheckNotNullOrigin(super.source, SimpleIdentifier super.node); - - @override - String get description => 'value checked to be non-null'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.argumentErrorCheckNotNull; -} - -/// Edge origin resulting from an assignment from a call to Angular's -/// `Injector.get` in a test `setUp` callback. -/// -/// For example, in the following code snippet: -/// -/// Foo foo; -/// setUp(() { -/// foo = injector.get(Foo); -/// }); -/// -/// this class is used for the edge connecting the type of the `foo` variable to -/// `never`, due to the assignment from `injector.get`. While `Injector.get` has -/// a return type of `dynamic`, it's use in a test `setUp` callback is more than -/// likely intended to yield a non-null value. -class AssignmentFromAngularInjectorGetOrigin extends EdgeOrigin { - AssignmentFromAngularInjectorGetOrigin( - super.source, SimpleIdentifier super.node, - {super.isSetupAssignment = false}); - - @override - String get description => 'value retrieved from Injector.get in test setUp'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.assignmentFromAngularInjectorGet; -} - -/// Edge origin resulting from a use of built_value's `@nullable` annotation. -class BuiltValueNullableOrigin extends EdgeOrigin { - BuiltValueNullableOrigin(super.source, AstNode super.node); - - @override - String get description => 'method is marked with the `@nullable` annotation'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.builtValueNullableAnnotation; -} - -/// An edge origin used for edges that originated because of a tear-off of -/// `call` on a function type. -class CallTearOffOrigin extends EdgeOrigin { - CallTearOffOrigin(super.source, AstNode super.node); - - @override - String get description => 'tear-off of .call'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.callTearOff; -} - -/// Edge origin resulting from the use of a value on the LHS of a compound -/// assignment. -class CompoundAssignmentOrigin extends EdgeOrigin { - CompoundAssignmentOrigin(super.source, AssignmentExpression super.node); - - @override - String get description => 'compound assignment'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.compoundAssignment; - - @override - AssignmentExpression? get node => super.node as AssignmentExpression?; -} - -/// Edge origin resulting from the use of an element which does not affect the -/// nullability graph in other ways. -class DummyOrigin extends EdgeOrigin { - DummyOrigin(super.source, AstNode super.node); - - @override - String get description => 'dummy'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.dummy; -} - -/// An edge origin used for edges that originated because of an assignment -/// involving a value with a dynamic type. -class DynamicAssignmentOrigin extends EdgeOrigin { - DynamicAssignmentOrigin(super.source, super.node, - {super.isSetupAssignment = false}); - - @override - String get description => 'assignment of dynamic value'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.dynamicAssignment; -} - -/// Common interface for classes providing information about how an edge came -/// to be; that is, what was found in the source code that led the migration -/// tool to create the edge. -abstract class EdgeOrigin extends EdgeOriginInfo { - @override - final Source? source; - - @override - final AstNode? node; - - @override - final Element? element; - - /// Whether the origin of the edge is due to the assignment of a variable - /// from within function literal argument to the `setUp` function of the test - /// package. - final bool isSetupAssignment; - - EdgeOrigin(this.source, this.node, {this.isSetupAssignment = false}) - : element = null; - - EdgeOrigin.forElement(this.element, {this.isSetupAssignment = false}) - : source = null, - node = null; - - /// Retrieves the location in the source code that caused this edge to be - /// created, or `null` if unknown. - CodeReference? get codeReference { - if (node != null) { - return CodeReference.fromAstNode(node!); - } - return null; - } - - /// User-friendly description of the edge. - String get description; -} - -/// An edge origin used for edges that originated because of a reference to an -/// enum value, which cannot be null. -class EnumValueOrigin extends EdgeOrigin { - EnumValueOrigin(super.source, AstNode super.node); - - @override - String get description => 'non-nullable enum value'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.enumValue; -} - -/// Edge origin resulting from an explicit or implicit `dynamic` type annotation -/// appearing in an external declaration. -class ExternalDynamicOrigin extends EdgeOrigin { - ExternalDynamicOrigin(super.source, AstNode super.node); - - @override - String get description => 'dynamic type in external declaration'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.externalDynamic; -} - -/// Edge origin resulting from the relationship between a field formal parameter -/// and the corresponding field. -class FieldFormalParameterOrigin extends EdgeOrigin { - FieldFormalParameterOrigin(super.source, FieldFormalParameter super.node); - - @override - String get description => 'field formal parameter'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.fieldFormalParameter; -} - -/// An edge origin used for edges that originated because a field was not -/// initialized. -/// -/// The AST node associated with the edge is the AST node for the constructor -/// that failed to initialize the field (or the class, if the constructor is -/// synthetic). -class FieldNotInitializedOrigin extends EdgeOrigin { - FieldNotInitializedOrigin(super.source, AstNode super.node); - - @override - String get description => 'field not initialized'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.fieldNotInitialized; -} - -/// Edge origin resulting from the use of an iterable type in a for-each loop. -/// -/// For example, in the following code snippet: -/// void f(Iterable l) { -/// for (int i in l) {} -/// } -/// -/// this class is used for the edge connecting the type of `l`'s `int` type -/// parameter to the type of `i`. -class ForEachVariableOrigin extends EdgeOrigin { - ForEachVariableOrigin(super.source, ForEachParts super.node); - - @override - String get description => 'variable in "for each" loop'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.forEachVariable; -} - -/// Edge origin resulting from the relationship between a getter and a setter. -class GetterSetterCorrespondenceOrigin extends EdgeOrigin { - GetterSetterCorrespondenceOrigin(super.source, AstNode super.node); - - @override - String get description => 'getter/setter correspondence'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.getterSetterCorrespondence; -} - -/// Edge origin resulting from the use of greatest lower bound. -/// -/// For example, in the following code snippet: -/// void Function(int) f(void Function(int) x, void Function(int) y) -/// => x ?? y; -/// -/// the `int` in the return type is nullable if both the `int`s in the types of -/// `x` and `y` are nullable, due to the fact that the `int` in the return type -/// is the greatest lower bound of the two other `int`s. -class GreatestLowerBoundOrigin extends EdgeOrigin { - GreatestLowerBoundOrigin(super.source, super.node); - - @override - String get description => 'greatest lower bound'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.greatestLowerBound; -} - -/// Edge origin resulting from the presence of a `??` operator. -class IfNullOrigin extends EdgeOrigin { - IfNullOrigin(super.source, AstNode super.node); - - @override - String get description => 'if-null operator'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.ifNull; -} - -/// Edge origin resulting from the implicit call from a mixin application -/// constructor to the corresponding super constructor. -/// -/// For example, in the following code snippet: -/// class C { -/// C(int i); -/// } -/// mixin M {} -/// class D = C with M; -/// -/// this class is used for the edge connecting the types of the `i` parameters -/// between the implicit constructor for `D` and the explicit constructor for -/// `C`. -class ImplicitMixinSuperCallOrigin extends EdgeOrigin { - ImplicitMixinSuperCallOrigin(super.source, ClassTypeAlias super.node); - - @override - String get description => 'implicit super call in mixin constructor'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.implicitMixinSuperCall; -} - -/// Edge origin resulting from the implicit assignment of `null` to a top level -/// variable or field that lacks an initializer. -class ImplicitNullInitializerOrigin extends EdgeOrigin { - ImplicitNullInitializerOrigin(super.source, AstNode super.node); - - @override - String get description => 'uninitialized variable'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.implicitNullInitializer; -} - -/// Edge origin resulting from a `return;` statement which implicitly returns -/// `null`. -class ImplicitNullReturnOrigin extends EdgeOrigin { - ImplicitNullReturnOrigin(super.source, ReturnStatement super.node); - - @override - String get description => 'implicit return of null'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.implicitNullReturn; - - @override - ReturnStatement? get node => super.node as ReturnStatement?; -} - -/// Edge origin used for edges that arise from an implicit use of `this`, e.g. -/// during a method call from an extension. -class ImplicitThisOrigin extends EdgeOrigin { - ImplicitThisOrigin(super.source, AstNode super.node); - - @override - String get description => 'implicit use of `this`'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.implicitThis; -} - -/// Edge origin resulting from the inference of a type parameter, which -/// can affects the nullability of that type parameter's bound. -class InferredTypeParameterInstantiationOrigin extends EdgeOrigin { - InferredTypeParameterInstantiationOrigin(super.source, AstNode super.node); - - @override - String get description => 'inferred type parameter'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.inferredTypeParameterInstantiation; -} - -/// An edge origin used for edges that originated because of an instance -/// creation expression. -class InstanceCreationOrigin extends EdgeOrigin { - InstanceCreationOrigin(super.source, AstNode super.node); - - @override - String get description => 'instance creation'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.instanceCreation; -} - -/// Edge origin resulting from a class that is instantiated to bounds. -/// -/// For example, in the following code snippet: -/// class C {} -/// C x; -/// -/// this class is used for the edge connecting the type of x's type parameter -/// with the type bound in the declaration of C. -class InstantiateToBoundsOrigin extends EdgeOrigin { - InstantiateToBoundsOrigin(super.source, NamedType super.node); - - @override - String get description => 'type instantiated to bounds'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.instantiateToBounds; -} - -/// Edge origin resulting from the use of a type as the main type in an 'is' -/// check. -/// -/// Before the migration, there was no way to say `is int?`, and therefore, -/// `is int` should migrate to non-null int. -class IsCheckMainTypeOrigin extends EdgeOrigin { - IsCheckMainTypeOrigin(super.source, TypeAnnotation super.node); - - @override - String get description => '"is" check does not accept null'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.isCheckMainType; -} - -/// An edge origin used for the return type of an iterator method that might be -/// changed into an extension method from package:collection. -class IteratorMethodReturnOrigin extends EdgeOrigin { - IteratorMethodReturnOrigin(super.source, AstNode super.node); - - @override - String get description => - 'Call to iterator method with orElse that returns null'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.iteratorMethodReturn; -} - -/// An edge origin used for the type argument of a list constructor that -/// specified an initial length, because that type argument must be nullable. -class ListLengthConstructorOrigin extends EdgeOrigin { - ListLengthConstructorOrigin(super.source, AstNode super.node); - - @override - String get description => 'construction of list via a length'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.listLengthConstructor; -} - -/// An edge origin used for edges that originated because a literal expression -/// has a known nullability. -class LiteralOrigin extends EdgeOrigin { - LiteralOrigin(super.source, AstNode super.node); - - @override - String get description => 'literal expression'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.literal; -} - -/// Edge origin resulting from a call site that does not supply a named -/// parameter. -/// -/// For example, in the following code snippet: -/// void f({int i}) {} -/// main() { -/// f(); -/// } -/// -/// this class is used for the edge connecting `always` to the type of f's `i` -/// parameter, due to the fact that the call to `f` implicitly passes a null -/// value for `i`. -class NamedParameterNotSuppliedOrigin extends EdgeOrigin { - NamedParameterNotSuppliedOrigin(super.source, AstNode super.node); - - @override - String get description => 'named parameter not supplied'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.namedParameterNotSupplied; -} - -/// Edge origin for the nullability of an expression that whose type is fixed by -/// the language definition to be non-nullable `bool`. -class NonNullableBoolTypeOrigin extends EdgeOrigin { - NonNullableBoolTypeOrigin(super.source, AstNode super.node); - - @override - String get description => 'non-null boolean expression'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.nonNullableBoolType; -} - -/// Edge origin resulting from the class/superclass relationship for a class -/// whose superclass is implicitly `Object`. -class NonNullableObjectSuperclass extends EdgeOrigin { - NonNullableObjectSuperclass(super.source, AstNode super.node); - - @override - String get description => 'implicit supertype of Object'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.nonNullableObjectSuperclass; -} - -/// Edge origin resulting from the usage of a value in a circumstance that -/// requires it to be non-nullable -class NonNullableUsageOrigin extends EdgeOrigin { - NonNullableUsageOrigin(super.source, AstNode super.node); - - @override - String get description => 'value cannot be null'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.nonNullableUsage; -} - -/// Edge origin resulting from the presence of a non-null assertion. -/// -/// For example, in the following code snippet: -/// void f(int i) { -/// assert(i != null); -/// } -/// -/// this class is used for the edge connecting the type of f's `i` parameter to -/// `never`, due to the assert statement proclaiming that `i` is not `null`. -class NonNullAssertionOrigin extends EdgeOrigin { - NonNullAssertionOrigin(super.source, Assertion super.node); - - @override - String get description => 'value asserted to be non-null'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.nonNullAssertion; -} - -/// Edge origin resulting from the presence of an explicit nullability hint -/// comment. -/// -/// For example, in the following code snippet: -/// void f(int/*?*/ i) {} -/// -/// this class is used for the edge connecting `always` to the type of f's `i` -/// parameter, due to the presence of the `/*?*/` comment. -class NullabilityCommentOrigin extends EdgeOrigin { - /// Indicates whether the nullability comment makes the type nullable or - /// non-nullable. - final bool isNullable; - - NullabilityCommentOrigin(super.source, AstNode super.node, this.isNullable) - : assert(node is TypeAnnotation || - node is FunctionTypedFormalParameter || - (node is FieldFormalParameter && node.parameters != null)); - - @override - String get description => - 'explicitly hinted to be ${isNullable ? 'nullable' : 'non-nullable'}'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.nullabilityComment; -} - -/// An edge origin arising from a null aware access. -class NullAwareAccessOrigin extends EdgeOrigin { - NullAwareAccessOrigin(super.source, AstNode super.node); - - @override - String get description => 'null aware access'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.nullAwareAccess; -} - -/// Edge origin resulting from the presence of an optional formal parameter. -/// -/// For example, in the following code snippet: -/// void f({int i}) {} -/// -/// this class is used for the edge connecting `always` to the type of f's `i` -/// parameter, due to the fact that `i` is optional and has no initializer. -class OptionalFormalParameterOrigin extends EdgeOrigin { - OptionalFormalParameterOrigin( - super.source, DefaultFormalParameter super.node); - - @override - String get description => 'optional formal parameter must be nullable'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.optionalFormalParameter; -} - -/// Edge origin resulting from an inheritance relationship between two method -/// parameters. -class ParameterInheritanceOrigin extends EdgeOrigin { - ParameterInheritanceOrigin(super.source, AstNode super.node); - - @override - String get description => 'function parameter override'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.parameterInheritance; -} - -/// Edge origin arising from arguments of public methods. -class PublicMethodArgumentOrigin extends EdgeOrigin { - PublicMethodArgumentOrigin(super.source, AstNode super.node); - - @override - String get description => 'public method argument'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.publicMethodArgument; -} - -/// Edge origin resulting from the presence of a call to quiver's -/// `checkNotNull`. -/// -/// For example, in the following code snippet: -/// import 'package:quiver/check.dart'; -/// void f(int i) { -/// checkNotNull(i); -/// } -/// -/// this class is used for the edge connecting the type of f's `i` parameter to -/// `never`, due to the `checkNotNull` call proclaiming that `i` is not `null`. -class QuiverCheckNotNullOrigin extends EdgeOrigin { - QuiverCheckNotNullOrigin(super.source, SimpleIdentifier super.node); - - @override - String get description => 'value checked to be non-null'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.quiverCheckNotNull; -} - -/// Edge origin resulting from an inheritance relationship between two method -/// return types. -class ReturnTypeInheritanceOrigin extends EdgeOrigin { - ReturnTypeInheritanceOrigin(super.source, AstNode super.node); - - @override - String get description => 'function return type override'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.returnTypeInheritance; -} - -/// Edge origin resulting from the use of a stacktrace parameter in a catch -/// directive. The type of such parameters is fixed by the language as -/// non-nullable `StackTrace`. -class StackTraceTypeOrigin extends EdgeOrigin { - StackTraceTypeOrigin(super.source, super.node); - - @override - String get description => 'stack trace variable is nullable'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.stackTraceTypeOrigin; -} - -/// Edge origin resulting from the use of `this` or `super`. -class ThisOrSuperOrigin extends EdgeOrigin { - /// Indicates whether the expression in question is `this`. If `false`, the - /// expression in question is `super`. - final bool isThis; - - ThisOrSuperOrigin(super.source, AstNode super.node, this.isThis); - - @override - String get description => - 'type of "${isThis ? 'this' : 'super'}" is non-nullable'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.thisOrSuper; -} - -/// An edge origin used for edges that originated from the type of a `throw` or -/// `rethrow`. -class ThrowOrigin extends EdgeOrigin { - ThrowOrigin(super.source, AstNode super.node); - - @override - String get description => - 'type of thrown expression is presumed non-nullable'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.throw_; -} - -/// Edge origin resulting from a usage of a typedef. -/// -/// Since typedefs require multiple phases to resolve, they are represented by -/// a set of inferred nodes. In the secondary phases of graph build, those get -/// unioned with references to the nodes referring to source code. The origin of -/// those union edges will be [TypedefReferenceOrigin]. -class TypedefReferenceOrigin extends EdgeOrigin { - TypedefReferenceOrigin(super.source, NamedType super.node); - - @override - String get description => 'reference to typedef'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.typedefReference; -} - -/// Edge origin resulting from the instantiation of a type parameter, which -/// affects the nullability of that type parameter's bound. -class TypeParameterInstantiationOrigin extends EdgeOrigin { - TypeParameterInstantiationOrigin(super.source, TypeAnnotation super.node); - - @override - String get description => 'type parameter instantiation'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.typeParameterInstantiation; - - @override - TypeAnnotation? get node => super.node as TypeAnnotation?; -} - -/// Edge origin resulting from the read of a variable that has not been -/// definitely assigned a value. -class UninitializedReadOrigin extends EdgeOrigin { - UninitializedReadOrigin(super.source, AstNode super.node); - - @override - String get description => 'local variable might not be initialized'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.uninitializedRead; -} diff --git a/pkg/nnbd_migration/lib/src/edit_plan.dart b/pkg/nnbd_migration/lib/src/edit_plan.dart deleted file mode 100644 index 96df4f7c6861..000000000000 --- a/pkg/nnbd_migration/lib/src/edit_plan.dart +++ /dev/null @@ -1,1764 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'dart:convert'; -import 'dart:math'; - -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:analyzer/dart/ast/precedence.dart'; -import 'package:analyzer/dart/ast/token.dart'; -import 'package:analyzer/dart/ast/visitor.dart'; -import 'package:analyzer/source/line_info.dart'; -import 'package:analyzer_plugin/protocol/protocol_common.dart'; -import 'package:meta/meta.dart'; -import 'package:nnbd_migration/fix_reason_target.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; - -Map>? _removeCode( - int offset, int end, _RemovalStyle removalStyle, AtomicEditInfo? info) { - if (offset < end) { - // TODO(paulberry): handle preexisting comments? - switch (removalStyle) { - case _RemovalStyle.commentSpace: - return { - offset: [AtomicEdit.insert('/* ', info: info)], - end: [AtomicEdit.insert('*/ ', info: info)] - }; - case _RemovalStyle.delete: - return { - offset: [AtomicEdit.delete(end - offset, info: info)] - }; - case _RemovalStyle.spaceComment: - return { - offset: [AtomicEdit.insert(' /*', info: info)], - end: [AtomicEdit.insert(' */', info: info)] - }; - case _RemovalStyle.spaceInsideComment: - return { - offset: [AtomicEdit.insert('/* ', info: info)], - end: [AtomicEdit.insert(' */', info: info)] - }; - } - } else { - return null; - } -} - -/// A single atomic change to a source file, decoupled from the location at -/// which the change is made. The [EditPlan] class performs its duties by -/// creating and manipulating [AtomicEdit] objects. -/// -/// A list of [AtomicEdit]s may be converted to a [SourceEdit] using the -/// extension [AtomicEditList], and a map of offsets to lists of [AtomicEdit]s -/// may be converted to a list of [SourceEdit] using the extension -/// [AtomicEditMap]. -/// -/// May be subclassed to allow additional information to be recorded about the -/// edit. -class AtomicEdit { - /// Additional information about this edit, or `null` if no additional - /// information is available. - final AtomicEditInfo? info; - - /// The number of characters that should be deleted by this edit, or `0` if no - /// characters should be deleted. - final int length; - - /// The characters that should be inserted by this edit, or the empty string - /// if no characters should be inserted. - final String replacement; - - /// If `true`, this edit shouldn't actually be made to the source file; it - /// exists merely to provide additional information to be shown in the preview - /// tool. - final bool isInformative; - - /// Initialize an edit to delete [length] characters. - /// - /// Optional argument [info] contains information about why the change was - /// made. - const AtomicEdit.delete(this.length, {this.info, this.isInformative = false}) - : assert(length > 0), - replacement = ''; - - /// Initialize an edit to insert the [replacement] characters. - /// - /// Optional argument [info] contains information about why the change was - /// made. - const AtomicEdit.insert(this.replacement, - {this.info, this.isInformative = false}) - : assert(replacement.length > 0), - length = 0; - - /// Initialize an edit to replace [length] characters with the [replacement] - /// characters. - /// - /// Optional argument [info] contains information about why the change was - /// made. - const AtomicEdit.replace(this.length, this.replacement, {this.info}) - : assert(length > 0 || replacement.length > 0), - isInformative = false; - - /// Return `true` if this edit is a deletion (no characters added). - bool get isDeletion => replacement.isEmpty; - - /// Return `true` if this edit is an insertion (no characters removed). - bool get isInsertion => length == 0; - - /// Return `true` if this edit is a replacement. - bool get isReplacement => length > 0 && replacement.isNotEmpty; - - @override - String toString() { - if (isInsertion) { - return 'InsertText(${json.encode(replacement)})'; - } else if (isDeletion) { - return 'DeleteText($length)'; - } else { - return 'ReplaceText($length, ${json.encode(replacement)})'; - } - } -} - -/// Information stored along with an atomic edit indicating how it arose. -class AtomicEditInfo { - /// A description of the change that was made. - final NullabilityFixDescription description; - - /// The reasons for the edit. - final Map fixReasons; - - /// If the edit is being made due to a hint, the hint in question; otherwise - /// `null`. - final HintComment? hintComment; - - AtomicEditInfo(this.description, this.fixReasons, {this.hintComment}); -} - -/// An [EditPlan] is a builder capable of accumulating a set of edits to be -/// applied to a given [AstNode]. -/// -/// Examples of edits include replacing it with a different node, prefixing or -/// suffixing it with additional text, or deleting some of the text it contains. -/// When the text being produced represents an expression, [EditPlan] also keeps -/// track of the precedence of the expression and whether it ends in a -/// cascade--this allows automatic insertion of parentheses when necessary, as -/// well as removal of parentheses when they become unnecessary. -/// -/// Typical usage will be to produce one or more [EditPlan] objects representing -/// changes to be made to the source code, compose them together, and then call -/// [EditPlan.finalize] to convert into a representation of the concrete edits -/// that need to be made to the source file. -abstract class EditPlan { - EditPlan._(); - - /// Returns the "parent" of the node edited by this [EditPlan]. For edit - /// plans that replace one AST node with another, this is the parent of the - /// AST node being replaced. For edit plans that insert or delete AST nodes, - /// this is the parent of the AST nodes that will be inserted or deleted. - AstNode? get parentNode; -} - -/// Factory class for creating [EditPlan]s. -class EditPlanner { - /// Indicates whether code removed by the EditPlanner should be removed by - /// commenting it out. A value of `false` means to actually delete the code - /// that is removed. - final bool? removeViaComments; - - /// The line info for the source file being edited. This is used when - /// removing statements that fill one or more lines, so that we can remove - /// the indentation as well as the statement, and avoid leaving behind ugly - /// whitespace. - final LineInfo? lineInfo; - - /// The text of the source file being edited. This is used when removing - /// code, so that we can figure out if it is safe to remove adjoining - /// whitespace. - final String? sourceText; - - EditPlanner(this.lineInfo, this.sourceText, {this.removeViaComments = false}); - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// converting the [hint] (which precedes the node) into text that is not - /// commented out. - NodeProducingEditPlan acceptPrefixHint( - NodeProducingEditPlan innerPlan, HintComment hint, - {AtomicEditInfo? info}) { - var affixPlan = innerPlan is _CommentAffixPlan - ? innerPlan - : _CommentAffixPlan(innerPlan); - var changes = hint.changesToAccept(sourceText, info: info); - assert(affixPlan.offset! >= _endForChanges(changes)!); - affixPlan.offset = _offsetForChanges(changes); - affixPlan._prefixChanges = changes + affixPlan._prefixChanges; - return affixPlan; - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// converting the [hint] (which follows the node) into text that is not - /// commented out. - NodeProducingEditPlan acceptSuffixHint( - NodeProducingEditPlan innerPlan, HintComment hint, - {AtomicEditInfo? info}) { - var affixPlan = innerPlan is _CommentAffixPlan - ? innerPlan - : _CommentAffixPlan(innerPlan); - var changes = hint.changesToAccept(sourceText); - assert(affixPlan.end! <= _offsetForChanges(changes)!); - affixPlan.end = _endForChanges(changes); - affixPlan._postfixChanges += hint.changesToAccept(sourceText, info: info); - return affixPlan; - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// appending the given [operand], with an intervening binary [operator]. - /// - /// Optional argument [info] contains information about why the change was - /// made. - NodeProducingEditPlan addBinaryPostfix( - NodeProducingEditPlan innerPlan, TokenType operator, String operand, - {AtomicEditInfo? info}) { - assert(innerPlan.sourceNode is Expression); - var precedence = Precedence.forTokenType(operator); - var isAssociative = precedence != Precedence.relational && - precedence != Precedence.equality && - precedence != Precedence.assignment; - return surround(innerPlan, - suffix: [AtomicEdit.insert(' ${operator.lexeme} $operand', info: info)], - outerPrecedence: precedence, - innerPrecedence: precedence, - associative: isAssociative); - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// prepending the given [operand], with an intervening binary [operator]. - /// - /// Optional argument [info] contains information about why the change was - /// made. - /// - /// If the expression represented by [operand] is known not to end in a - /// cascade expression, caller may optionally set [allowCascade] to `true` to - /// prevent a rare corner case where parentheses would be added unnecessarily. - /// Note that it is always safe to leave [allowCascade] at its default value - /// of `false`. - NodeProducingEditPlan addBinaryPrefix( - String operand, TokenType operator, NodeProducingEditPlan innerPlan, - {AtomicEditInfo? info, bool allowCascade = false}) { - assert(innerPlan.sourceNode is Expression); - var precedence = Precedence.forTokenType(operator); - var isAssociative = precedence == Precedence.assignment; - return surround(innerPlan, - prefix: [AtomicEdit.insert('$operand ${operator.lexeme} ', info: info)], - outerPrecedence: precedence, - innerPrecedence: precedence, - associative: isAssociative, - allowCascade: allowCascade); - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// appending the given [comment]]. - /// - /// Optional argument [info] contains information about why the change was - /// made. - /// - /// Optional argument [isInformative] indicates whether the comment is simply - /// informative, or should actually be applied to the final output (the - /// default). - NodeProducingEditPlan addCommentPostfix( - NodeProducingEditPlan innerPlan, String comment, - {AtomicEditInfo? info, bool isInformative = false}) { - var end = innerPlan.end!; - return surround(innerPlan, suffix: [ - AtomicEdit.insert(' ', isInformative: isInformative), - AtomicEdit.insert(comment, info: info, isInformative: isInformative), - if (!_isJustBefore(end, const [')', ']', '}', ';']) && - !_isJustBeforeWhitespace(end)) - AtomicEdit.insert(' ', isInformative: isInformative) - ]); - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// appending the given text with postfix precedence. This could be used, for - /// example, to append a property access or method call. - /// - /// Optional argument [info] contains information about why the change was - /// made. - NodeProducingEditPlan addPostfix(NodeProducingEditPlan innerPlan, String text, - {AtomicEditInfo? info}) { - assert(innerPlan.sourceNode is Expression); - return surround(innerPlan, - suffix: [AtomicEdit.insert(text, info: info)], - outerPrecedence: Precedence.postfix, - innerPrecedence: Precedence.postfix, - associative: true); - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// appending the given postfix [operator]. This could be used, for example, - /// to add a null check. - /// - /// Optional argument [info] contains information about why the change was - /// made. - NodeProducingEditPlan addUnaryPostfix( - NodeProducingEditPlan innerPlan, TokenType operator, - {AtomicEditInfo? info}) => - addPostfix(innerPlan, operator.lexeme, info: info); - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// prepending the given prefix [operator]. - /// - /// Optional argument [info] contains information about why the change was - /// made. - NodeProducingEditPlan addUnaryPrefix( - TokenType operator, NodeProducingEditPlan innerPlan, - {AtomicEditInfo? info}) { - assert(innerPlan.sourceNode is Expression); - return surround(innerPlan, - prefix: [AtomicEdit.insert(operator.lexeme, info: info)], - outerPrecedence: Precedence.prefix, - innerPrecedence: Precedence.prefix, - associative: true); - } - - /// Creates a [_PassThroughBuilder] object based around [node]. - /// - /// Exposed so that we can substitute a mock class in unit tests. - @visibleForTesting - PassThroughBuilder createPassThroughBuilder(AstNode? node) => - _PassThroughBuilderImpl(node); - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// dropping the given nullability [hint]. - NodeProducingEditPlan dropNullabilityHint( - NodeProducingEditPlan innerPlan, HintComment hint, - {AtomicEditInfo? info}) { - var affixPlan = innerPlan is _CommentAffixPlan - ? innerPlan - : _CommentAffixPlan(innerPlan); - var changes = hint.changesToRemove(sourceText, info: info); - assert(affixPlan.end! <= _offsetForChanges(changes)!); - affixPlan.end = _endForChanges(changes); - affixPlan._postfixChanges += changes; - return affixPlan; - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// appending an informative ` `, to illustrate that the type is non-nullable. - /// - /// Optional argument [info] contains information about why the change was - /// made. - NodeProducingEditPlan explainNonNullable(NodeProducingEditPlan innerPlan, - {AtomicEditInfo? info}) { - assert(innerPlan.sourceNode is TypeAnnotation); - return surround(innerPlan, - suffix: [AtomicEdit.insert(' ', info: info, isInformative: true)]); - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// removing from the source code any code that is in [sourceNode] but not in - /// [innerPlan.sourceNode]. This is intended to be used to drop unnecessary - /// syntax (for example, to drop an unnecessary cast). - /// - /// If no changes are required to the AST node that is being extracted, the - /// caller may create innerPlan using [EditPlan.passThrough]. - /// - /// Optional parameters [infoBefore] and [infoAfter] contain information about - /// why the change was made. The reason there are two of these parameters is - /// because in general, two chunks of source code will be removed: the code - /// coming before [innerPlan.sourceNode] and the code coming after it. - /// - /// [innerPlan] will be finalized as a side effect (either immediately or when - /// the newly created plan is finalized), so it should not be re-used by the - /// caller. - NodeProducingEditPlan extract( - AstNode? sourceNode, NodeProducingEditPlan innerPlan, - {AtomicEditInfo? infoBefore, - AtomicEditInfo? infoAfter, - bool alwaysDelete = false}) { - var parent = innerPlan.sourceNode!.parent; - if (!identical(parent, sourceNode) && parent is ParenthesizedExpression) { - innerPlan = _ProvisionalParenEditPlan(parent, innerPlan); - } - return _ExtractEditPlan( - sourceNode, innerPlan, this, infoBefore, infoAfter, alwaysDelete); - } - - /// Converts [plan] to a representation of the concrete edits that need - /// to be made to the source file. These edits may be converted into - /// [SourceEdit]s using the extensions [AtomicEditList] and [AtomicEditMap]. - /// - /// Finalizing an [EditPlan] is a destructive operation; it should not be used - /// again after it is finalized. - Map>? finalize(EditPlan plan) { - // Convert to a plan for the top level CompilationUnit. - var parent = plan.parentNode; - if (parent != null) { - var unit = parent.thisOrAncestorOfType(); - plan = passThrough(unit, innerPlans: [plan]); - } - // The plan for a compilation unit should always be a NodeProducingEditPlan. - // So we can just ask it for its changes. - return (plan as NodeProducingEditPlan)._getChanges(false); - } - - /// Creates a new edit plan that adds an informative message to the given - /// [token]. - /// - /// The created edit plan should be inserted into the list of inner plans for - /// a pass-through plan targeted at the [containingNode]. See [passThrough]. - EditPlan informativeMessageForToken(AstNode containingNode, Token token, - {AtomicEditInfo? info}) { - return _TokenChangePlan(containingNode, { - token.offset: [ - AtomicEdit.delete(token.lexeme.length, info: info, isInformative: true) - ] - }); - } - - /// Creates a new edit plan that inserts the text indicated by [edits] at the - /// given [offset]. - /// - /// The created edit will have the given [parentNode]. In general this should - /// be the innermost AST node containing the given [offset]. - EditPlan insertText(AstNode parentNode, int offset, List edits) { - assert(!edits.any((edit) => !edit.isInsertion), - 'All edits should be insertions'); - return _TokenChangePlan(parentNode, {offset: edits}); - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// appending a `?`, to make a type nullable. - /// - /// Optional argument [info] contains information about why the change was - /// made. - NodeProducingEditPlan makeNullable(NodeProducingEditPlan innerPlan, - {AtomicEditInfo? info}) { - var sourceNode = innerPlan.sourceNode; - assert(sourceNode is TypeAnnotation || - sourceNode is FunctionTypedFormalParameter || - (sourceNode is FieldFormalParameter && sourceNode.parameters != null)); - return surround(innerPlan, suffix: [AtomicEdit.insert('?', info: info)]); - } - - /// Creates a new edit plan that makes no changes to [node], but may make - /// changes to some of its descendants (specified via [innerPlans]). - /// - /// Note that the [innerPlans] must be specified in document order. - /// - /// All plans in [innerPlans] will be finalized as a side effect (either - /// immediately or when the newly created plan is finalized), so they should - /// not be re-used by the caller. - NodeProducingEditPlan passThrough(AstNode? node, - {Iterable innerPlans = const []}) { - // It's possible that some of the inner plans are nested more deeply within - // [node] than others. We want to group these inner plans together into - // pass through plans at each level in the AST until we bubble up to [node]. - // To do so, we form a stack of [_PassThroughBuilder] objects to handle each - // level of AST depth, where the first entry in the stack corresponds to - // [node], and each subsequent entry will correspond to a child of the - // previous. - var builderStack = [createPassThroughBuilder(node)]; - var ancestryPath = []; - for (var plan in innerPlans) { - // Compute the ancestryPath (the path from `plan.parentNode` up to - // `node`). Note that whereas builderStack walks stepwise down the AST, - // ancestryStack will walk stepwise up the AST, with the last entry of - // ancestryStack corresponding to the first entry of builderStack. We - // re-use the same list for each loop iteration to reduce GC load. - ancestryPath.clear(); - for (var parent = plan.parentNode; - !identical(parent, node); - parent = parent!.parent) { - ancestryPath.add(parent); - } - ancestryPath.add(node); - // Find the deepest entry in builderStack that's on the ancestryPath. - var builderIndex = _findMatchingBuilder(builderStack, ancestryPath); - // We're finished with all builders beyond that entry. - while (builderStack.length > builderIndex + 1) { - var passThrough = builderStack.removeLast().finish(this); - builderStack.last.add(passThrough); - } - // And we may need to add new builders to make our way down to - // `plan.parentNode`. - while (builderStack.length < ancestryPath.length) { - // Since builderStack and ancestryPath walk in different directions - // through the AST, when building entry builderIndex, we need to count - // backwards from the end of ancestryPath to figure out which node to - // associate the builder with. - builderStack.add(createPassThroughBuilder( - ancestryPath[ancestryPath.length - builderStack.length - 1])); - } - // Now the deepest entry in the builderStack corresponds to - // `plan.parentNode`, so we can add the plan to it. - builderStack.last.add(plan); - } - // We're now finished with all builders. - while (true) { - var passThrough = builderStack.removeLast().finish(this); - if (builderStack.isEmpty) return passThrough; - builderStack.last.add(passThrough); - } - } - - /// Creates a new edit plan that removes [sourceNode] from the AST. - /// - /// [sourceNode] must be one element of a variable length sequence maintained - /// by [sourceNode]'s parent (for example, a statement in a block, an element - /// in a list, a declaration in a class, etc.). If it is not, an exception is - /// thrown. - /// - /// Optional argument [info] contains information about why the change was - /// made. - EditPlan removeNode(AstNode sourceNode, {AtomicEditInfo? info}) { - var result = tryRemoveNode(sourceNode, info: info); - if (result == null) { - var parent = sourceNode.parent; - throw StateError( - 'Cannot remove node whose parent is of type ${parent.runtimeType}'); - } - return result; - } - - /// Creates a new edit plan that removes a sequence of adjacent nodes from - /// the AST, starting with [firstSourceNode] and ending with [lastSourceNode]. - /// - /// [firstSourceNode] and [lastSourceNode] must be elements of a variable - /// length sequence maintained by their (common) parent (for example, - /// statements in a block, elements in a list, declarations in a class, etc.) - /// [lastSourceNode] must come after [firstSourceNode]. - /// - /// If [firstSourceNode] and [lastSourceNode] are the same node, then the - /// behavior is identical to [removeNode] (i.e. just the one node is removed). - /// - /// Optional argument [info] contains information about why the change was - /// made. - EditPlan removeNodes(AstNode firstSourceNode, AstNode lastSourceNode, - {AtomicEditInfo? info}) { - var parent = firstSourceNode.parent; - assert(identical(lastSourceNode.parent, parent)); - var sequenceNodes = _computeSequenceNodes(parent); - if (sequenceNodes == null) { - throw StateError( - 'Cannot remove node whose parent is of type ${parent.runtimeType}'); - } - var firstIndex = sequenceNodes.indexOf(firstSourceNode); - assert(firstIndex != -1); - var lastIndex = sequenceNodes.indexOf(lastSourceNode, firstIndex); - assert(lastIndex >= firstIndex); - return _RemoveEditPlan(parent, firstIndex, lastIndex, info); - } - - /// Creates a new edit plan that removes null awareness from [sourceNode]. - /// - /// The created edit plan should be inserted into the list of inner plans for - /// a pass-through plan targeted at the source node. See [passThrough]. - /// - /// Optional argument [info] contains information about why the change was - /// made. - /// - /// Optional argument [isInformative] indicates whether the comment is simply - /// informative, or should actually be applied to the final output (the - /// default). - EditPlan removeNullAwareness(Expression sourceNode, - {AtomicEditInfo? info, bool isInformative = false}) { - Token? operator; - if (sourceNode is MethodInvocation) { - operator = sourceNode.operator; - } else if (sourceNode is PropertyAccess) { - operator = sourceNode.operator; - } else { - throw StateError( - 'Tried to remove null awareness from an unexpected node type: ' - '${sourceNode.runtimeType}'); - } - assert(operator!.type == TokenType.QUESTION_PERIOD); - return _TokenChangePlan(sourceNode, { - operator!.offset: [ - AtomicEdit.delete(1, info: info, isInformative: isInformative) - ] - }); - } - - /// Creates a new edit plan that replaces the contents of [sourceNode] with - /// the given [replacement] text. - /// - /// If the edit plan is going to be used in a context where an expression is - /// expected, additional arguments should be provided to control the behavior - /// of parentheses insertion and deletion: [precedence] indicates the - /// precedence of the resulting expression. [endsInCascade] indicates whether - /// the resulting plan will end in a cascade. - /// - /// Optional argument [info] contains information about why the change was - /// made. - NodeProducingEditPlan replace( - AstNode sourceNode, List replacement, - {Precedence precedence = Precedence.primary, - bool endsInCascade = false, - AtomicEditInfo? info}) { - assert(!replacement.any((edit) => !edit.isInsertion), - 'All edits should be insertions'); - return _SimpleEditPlan(sourceNode, precedence, endsInCascade, { - sourceNode.offset: [ - AtomicEdit.delete(sourceNode.length, info: info), - ...replacement - ] - }); - } - - /// Creates a new edit plan that replaces [token] with the given [replacement] - /// text. - /// - /// [parentNode] should be the innermost AST node containing [token]. - EditPlan replaceToken(AstNode parentNode, Token token, String replacement, - {AtomicEditInfo? info}) { - return _TokenChangePlan(parentNode, { - token.offset: [AtomicEdit.replace(token.length, replacement, info: info)] - }); - } - - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// surrounding it with [prefix] and [suffix] text. This could be used, for - /// example, to add a cast. - /// - /// Note that it's tricky to get precedence correct. When possible, use one - /// of the other methods in this class, such as [addBinaryPostfix], - /// [addBinaryPrefix], [addUnaryPostfix], or [addUnaryPrefix]. - /// - /// If the edit plan is going to be used in a context where an expression is - /// expected, additional arguments should be provided to control the behavior - /// of parentheses insertion and deletion: [outerPrecedence] indicates the - /// precedence of the resulting expression. [innerPrecedence] indicates the - /// precedence that is required for [innerPlan]. [associative] indicates - /// whether it is allowed for [innerPlan]'s precedence to match - /// [innerPrecedence]. [allowCascade] indicates whether [innerPlan] can end - /// in a cascade section without requiring parentheses. [endsInCascade] - /// indicates whether the resulting plan will end in a cascade. - /// - /// So, for example, if it is desired to append the suffix ` + foo` to an - /// expression, specify `Precedence.additive` for [outerPrecedence] and - /// [innerPrecedence], and `true` for [associative] (since addition associates - /// to the left). - /// - /// Note that [endsInCascade] is ignored if there is no [suffix] (since in - /// this situation, whether the final plan ends in a cascade section will be - /// determined by [innerPlan]). - NodeProducingEditPlan surround(NodeProducingEditPlan innerPlan, - {List? prefix, - List? suffix, - Precedence outerPrecedence = Precedence.primary, - Precedence innerPrecedence = Precedence.none, - bool associative = false, - bool allowCascade = false, - bool endsInCascade = false}) { - var parensNeeded = innerPlan._parensNeeded( - threshold: innerPrecedence, - associative: associative, - allowCascade: allowCascade); - var innerChanges = - innerPlan._getChanges(parensNeeded) ?? >{}; - if (prefix != null) { - (innerChanges[innerPlan.offset] ??= []).insertAll(0, prefix); - } - if (suffix != null) { - (innerChanges[innerPlan.end] ??= []).addAll(suffix); - } - return _SimpleEditPlan( - innerPlan.sourceNode, - outerPrecedence, - suffix == null - ? innerPlan.endsInCascade && !parensNeeded - : endsInCascade, - innerChanges); - } - - /// Tries to create a new edit plan that removes [node] from the AST. - /// - /// [node] must be one element of a variable length sequence maintained by - /// [node]'s parent (for example, a statement in a block, an element in a - /// list, a declaration in a class, etc.). If it is not, `null` is returned. - /// - /// Optional argument [info] contains information about why the change was - /// made. - EditPlan? tryRemoveNode(AstNode sourceNode, - {List? sequenceNodes, AtomicEditInfo? info}) { - var parent = sourceNode.parent; - sequenceNodes ??= _computeSequenceNodes(parent); - if (sequenceNodes == null) { - return null; - } - var index = sequenceNodes.indexOf(sourceNode); - assert(index != -1); - return _RemoveEditPlan(parent, index, index, info); - } - - /// Walks backward through the source text, starting at [offset] and stopping - /// before passing any non-whitespace character. - /// - /// Does not walk further than [limit] (which should be less than or equal to - /// [offset]). - int _backAcrossWhitespace(int offset, int limit) { - assert(limit <= offset); - return limit + sourceText!.substring(limit, offset).trimRight().length; - } - - /// Walks backward through the source text, starting at [offset] and stopping - /// when the beginning of the line is reached. - /// - /// If [offset] is at the beginning of the line, it is returned unchanged. - int _backToLineStart(int offset) { - var lineNumber = lineInfo!.getLocation(offset).lineNumber; - // lineNumber is one-based, but lineInfo.lineStarts expects a zero-based - // index, so we need `lineInfo.lineStarts[lineNumber - 1]`. - return lineInfo!.lineStarts[lineNumber - 1]; - } - - int? _endForChanges(Map> changes) { - int? result; - for (var entry in changes.entries) { - var end = entry.key; - for (var edit in entry.value) { - end = end! + edit.length; - } - if (result == null || end! > result) result = end; - } - return result; - } - - /// Finds the deepest entry in [builderStack] that matches an entry in - /// [ancestryStack], taking advantage of the fact that [builderStack] walks - /// stepwise down the AST, and [ancestryStack] walks stepwise up the AST, with - /// the last entry of [ancestryStack] corresponding to the first entry of - /// [builderStack]. - int _findMatchingBuilder( - List builderStack, List ancestryStack) { - var builderIndex = builderStack.length - 1; - while (builderIndex > 0) { - var ancestryIndex = ancestryStack.length - builderIndex - 1; - if (ancestryIndex >= 0 && - identical( - builderStack[builderIndex].node, ancestryStack[ancestryIndex])) { - break; - } - --builderIndex; - } - return builderIndex; - } - - /// Walks forward through the source text, starting at [offset] and stopping - /// before passing any non-whitespace character. - /// - /// Does not walk further than [limit] (which should be greater than or equal - /// to [offset]). - int _forwardAcrossWhitespace(int offset, int limit) { - return limit - sourceText!.substring(offset, limit).trimLeft().length; - } - - /// Walks forward through the source text, starting at [offset] and stopping - /// at the beginning of the next line (or at the end of the document, if this - /// line is the last line). - int _forwardToLineEnd(int offset) { - int lineNumber = lineInfo!.getLocation(offset).lineNumber; - // lineNumber is one-based, so if it is equal to - // `lineInfo.lineStarts.length`, then we are on the last line. - if (lineNumber >= lineInfo!.lineStarts.length) { - return sourceText!.length; - } - // lineInfo.lineStarts expects a zero-based index, so - // `lineInfo.lineStarts[lineNumber]` gives us the beginning of the next - // line. - return lineInfo!.lineStarts[lineNumber]; - } - - /// Determines whether the given source [offset] comes just after one of the - /// characters in [characters]. - bool _isJustAfter(int offset, List characters) => - offset > 0 && characters.contains(sourceText![offset - 1]); - - /// Determines whether the given source [end] comes just before one of the - /// characters in [characters]. - bool _isJustBefore(int end, List characters) => - end < sourceText!.length && characters.contains(sourceText![end]); - - /// Determines whether the given source [end] comes just before whitespace. - /// For the purpose of this check, the end of the file is considered - /// whitespace. - bool _isJustBeforeWhitespace(int end) => - end >= sourceText!.length || _isWhitespaceRange(end, end + 1); - - /// Determines if the characters between [offset] and [end] in the source text - /// are all whitespace characters. - bool _isWhitespaceRange(int offset, int end) { - return sourceText!.substring(offset, end).trimRight().isEmpty; - } - - int? _offsetForChanges(Map> changes) { - int? result; - for (var key in changes.keys) { - if (result == null || key! < result) result = key; - } - return result; - } - - /// If the given [node] maintains a variable-length sequence of child nodes, - /// returns a list containing those child nodes, otherwise returns `null`. - /// - /// The returned list may or may not be the exact list used by the node to - /// maintain its child nodes. For example, [CompilationUnit] maintains its - /// directives and declarations in separate lists, so the returned list is - /// a new list containing both directives and declarations. - static List? _computeSequenceNodes(AstNode? node) { - if (node is Block) { - return node.statements; - } else if (node is ListLiteral) { - return node.elements; - } else if (node is SetOrMapLiteral) { - return node.elements; - } else if (node is ArgumentList) { - return node.arguments; - } else if (node is FormalParameter) { - return node.metadata; - } else if (node is FormalParameterList) { - return node.parameters; - } else if (node is VariableDeclarationList) { - return node.variables; - } else if (node is TypeArgumentList) { - return node.arguments; - } else if (node is TypeParameterList) { - return node.typeParameters; - } else if (node is EnumDeclaration) { - return node.constants; - } else if (node is ClassDeclaration) { - return node.members; - } else if (node is CompilationUnit) { - return [...node.directives, ...node.declarations]; - } else if (node is MethodDeclaration) { - return node.metadata; - } else { - return null; - } - } -} - -/// Specialization of [EditPlan] for the situation where the text being produced -/// represents a single expression (i.e. an expression, statement, class -/// declaration, etc.) -abstract class NodeProducingEditPlan extends EditPlan { - /// The AST node to which the edit plan applies. - final AstNode? sourceNode; - - NodeProducingEditPlan._(this.sourceNode) : super._(); - - /// Offset just past the end of the source text affected by this plan. - int? get end => sourceNode!.end; - - /// If the result of executing this [EditPlan] will be an expression, - /// indicates whether the expression will end in an unparenthesized cascade. - @visibleForTesting - bool get endsInCascade; - - /// Offset of the start of the source text affected by this plan. - int? get offset => sourceNode!.offset; - - @override - AstNode? get parentNode => sourceNode!.parent; - - /// Determines whether the text produced by this [EditPlan] would need - /// parentheses if it were to be used as a replacement for its [sourceNode]. - /// - /// If this [EditPlan] would produce an expression that ends in a cascade, it - /// will be necessary to search the [sourceNode]'s ancestors to see if any of - /// them represents a cascade section (and hence, parentheses are required). - /// If a non-null value is provided for [cascadeSearchLimit], it is the most - /// distant ancestor that will be searched. - @visibleForTesting - bool? parensNeededFromContext(AstNode? cascadeSearchLimit) { - if (sourceNode is! Expression) return false; - var parent = sourceNode!.parent; - return parent == null - ? false - : parent - .accept(_ParensNeededFromContextVisitor(this, cascadeSearchLimit)); - } - - /// Modifies [changes] to insert parentheses enclosing the [sourceNode]. This - /// works even if [changes] already includes modifications at the beginning or - /// end of [sourceNode]--the parentheses are inserted outside of any - /// preexisting changes. - Map>? _createAddParenChanges( - Map>? changes) { - changes ??= {}; - (changes[offset] ??= []).insert(0, const AtomicEdit.insert('(')); - (changes[end] ??= []).add(const AtomicEdit.insert(')')); - return changes; - } - - /// Computes the necessary set of [changes] for this [EditPlan], either - /// including or not including parentheses depending on the value of [parens]. - /// - /// An [EditPlan] for which [_getChanges] has been called is considered to be - /// finalized. - Map>? _getChanges(bool parens); - - /// Determines if the text that would be produced by [EditPlan] needs to be - /// surrounded by parens, based on the context in which it will be used. - bool _parensNeeded( - {required Precedence threshold, - bool associative = false, - bool allowCascade = false}); -} - -/// Data structure that accumulates together a set of [EditPlans] sharing a -/// common parent node, and groups them together into an [EditPlan] with a -/// parent node one level up the AST. -@visibleForTesting -abstract class PassThroughBuilder { - /// The AST node that is the parent of all the [EditPlan]s being accumulated. - AstNode? get node; - - /// Accumulate another edit plan. - void add(EditPlan innerPlan); - - /// Called when no more edit plans need to be added. Returns the final - /// [EditPlan]. - NodeProducingEditPlan finish(EditPlanner planner); -} - -/// [EditPlan] that wraps an inner plan with optional prefix and suffix changes. -class _CommentAffixPlan extends _NestedEditPlan { - Map>? _prefixChanges; - - Map>? _postfixChanges; - - @override - int? offset; - - @override - int? end; - - _CommentAffixPlan(NodeProducingEditPlan innerPlan) - : offset = innerPlan.offset, - end = innerPlan.end, - super(innerPlan.sourceNode, innerPlan); - - @override - Map>? _getChanges(bool parens) => - _prefixChanges + innerPlan._getChanges(parens) + _postfixChanges; -} - -/// Visitor that determines whether a given [AstNode] ends in a cascade. -class _EndsInCascadeVisitor extends UnifyingAstVisitor { - bool endsInCascade = false; - - final int end; - - _EndsInCascadeVisitor(this.end); - - @override - void visitCascadeExpression(CascadeExpression node) { - if (node.end != end) return; - endsInCascade = true; - } - - @override - void visitNode(AstNode node) { - if (node.end != end) return; - node.visitChildren(this); - } -} - -/// [EditPlan] representing an "extraction" of an inner AST node, e.g. replacing -/// `a + b * c` with `b + c`. -/// -/// Defers computation of whether parentheses are needed to the inner plan. -class _ExtractEditPlan extends _NestedEditPlan { - final EditPlanner _planner; - - final AtomicEditInfo? _infoBefore; - - final AtomicEditInfo? _infoAfter; - - /// Whether text-to-be-removed should be removed (as opposed to commented out) - /// even when [EditPlan.removeViaComments] is true. - final bool _alwaysDelete; - - _ExtractEditPlan(super.sourceNode, super.innerPlan, this._planner, - this._infoBefore, this._infoAfter, this._alwaysDelete); - - @override - Map>? _getChanges(bool parens) { - // Get the inner changes. If they already have provisional parens and we - // need them, use them. - var useInnerParens = parens && innerPlan is _ProvisionalParenEditPlan; - var changes = innerPlan._getChanges(useInnerParens); - // TODO(paulberry): don't remove comments - _RemovalStyle leadingChangeRemovalStyle; - _RemovalStyle trailingChangeRemovalStyle; - if (_alwaysDelete || !_planner.removeViaComments!) { - leadingChangeRemovalStyle = _RemovalStyle.delete; - trailingChangeRemovalStyle = _RemovalStyle.delete; - } else { - leadingChangeRemovalStyle = _RemovalStyle.commentSpace; - trailingChangeRemovalStyle = _RemovalStyle.spaceComment; - } - // Extract the inner expression. - changes = _removeCode(offset!, innerPlan.offset!, leadingChangeRemovalStyle, - _infoBefore) + - changes + - _removeCode( - innerPlan.end!, end!, trailingChangeRemovalStyle, _infoAfter); - // Apply parens if needed. - if (parens && !useInnerParens) { - changes = _createAddParenChanges(changes); - } - return changes; - } -} - -/// [EditPlan] representing additional edits performed on the result of a -/// previous [innerPlan]. -/// -/// By default, defers computation of whether parentheses are needed to the -/// inner plan. -abstract class _NestedEditPlan extends NodeProducingEditPlan { - final NodeProducingEditPlan innerPlan; - - _NestedEditPlan(super.sourceNode, this.innerPlan) : super._(); - - @override - bool get endsInCascade => innerPlan.endsInCascade; - - @override - bool _parensNeeded( - {required Precedence threshold, - bool associative = false, - bool allowCascade = false}) => - innerPlan._parensNeeded( - threshold: threshold, - associative: associative, - allowCascade: allowCascade); -} - -/// Visitor that determines whether an [_editPlan] needs to be parenthesized -/// based on the context surrounding its source node. To use this class, visit -/// the source node's parent. -class _ParensNeededFromContextVisitor extends GeneralizingAstVisitor { - final NodeProducingEditPlan _editPlan; - - /// If [_editPlan] would produce an expression that ends in a cascade, it - /// will be necessary to search the [_target]'s ancestors to see if any of - /// them represents a cascade section (and hence, parentheses are required). - /// If a non-null value is provided for [_cascadeSearchLimit], it is the most - /// distant ancestor that will be searched. - final AstNode? _cascadeSearchLimit; - - _ParensNeededFromContextVisitor(this._editPlan, this._cascadeSearchLimit) { - assert(_target is Expression); - } - - AstNode? get _target => _editPlan.sourceNode; - - @override - bool visitAsExpression(AsExpression node) { - if (identical(_target, node.expression)) { - return _editPlan._parensNeeded(threshold: Precedence.relational); - } else { - return false; - } - } - - @override - bool visitAssignmentExpression(AssignmentExpression node) { - if (identical(_target, node.rightHandSide)) { - return _editPlan._parensNeeded( - threshold: Precedence.none, - allowCascade: !_isRightmostDescendantOfCascadeSection(node)); - } else { - return false; - } - } - - @override - bool visitAwaitExpression(AwaitExpression node) { - assert(identical(_target, node.expression)); - return _editPlan._parensNeeded( - threshold: Precedence.prefix, associative: true); - } - - @override - bool visitBinaryExpression(BinaryExpression node) { - var precedence = node.precedence; - return _editPlan._parensNeeded( - threshold: precedence, - associative: identical(_target, node.leftOperand) && - precedence != Precedence.relational && - precedence != Precedence.equality); - } - - @override - bool visitCascadeExpression(CascadeExpression node) { - if (identical(_target, node.target)) { - return _editPlan._parensNeeded( - threshold: Precedence.cascade, associative: true, allowCascade: true); - } else { - return false; - } - } - - @override - bool visitConditionalExpression(ConditionalExpression node) { - if (identical(_target, node.condition)) { - return _editPlan._parensNeeded(threshold: Precedence.conditional); - } else { - return _editPlan._parensNeeded(threshold: Precedence.none); - } - } - - @override - bool visitExtensionOverride(ExtensionOverride node) { - return _editPlan._parensNeeded( - threshold: Precedence.postfix, associative: true); - } - - @override - bool visitFunctionExpressionInvocation(FunctionExpressionInvocation node) { - assert(identical(_target, node.function)); - return _editPlan._parensNeeded( - threshold: Precedence.postfix, associative: true); - } - - @override - bool visitIndexExpression(IndexExpression node) { - if (identical(_target, node.target)) { - return _editPlan._parensNeeded( - threshold: Precedence.postfix, associative: true); - } else { - return false; - } - } - - @override - bool visitIsExpression(IsExpression node) { - if (identical(_target, node.expression)) { - return _editPlan._parensNeeded(threshold: Precedence.relational); - } else { - return false; - } - } - - @override - bool visitMethodInvocation(MethodInvocation node) { - // Note: it's tempting to assert identical(_target, node.target) here, - // because in a method invocation like `x.m(...)`, the only AST node that's - // a child of the method invocation and semantically represents an - // expression is the target (`x` in this example). Unfortunately, that - // doesn't work, because even though `m` isn't semantically an expression, - // it's represented in the analyzer AST as an identifier and Identifier - // implements Expression. So we have to handle both `x` and `m`. - // - // Fortunately we don't have to do any extra work to handle `m`, because it - // will always be an identifier, hence it will always be high precedence and - // it will never require parentheses. So we just do the correct logic for - // the target, without asserting. - return _editPlan._parensNeeded( - threshold: Precedence.postfix, associative: true); - } - - @override - bool visitNode(AstNode node) { - return false; - } - - @override - bool visitParenthesizedExpression(ParenthesizedExpression node) { - assert(identical(_target, node.expression)); - return false; - } - - @override - bool visitPostfixExpression(PostfixExpression node) { - assert(identical(_target, node.operand)); - return _editPlan._parensNeeded( - threshold: Precedence.postfix, associative: true); - } - - @override - bool visitPrefixedIdentifier(PrefixedIdentifier node) { - if (identical(_target, node.prefix)) { - return _editPlan._parensNeeded( - threshold: Precedence.postfix, associative: true); - } else { - assert(identical(_target, node.identifier)); - return _editPlan._parensNeeded( - threshold: Precedence.primary, associative: true); - } - } - - @override - bool visitPrefixExpression(PrefixExpression node) { - assert(identical(_target, node.operand)); - return _editPlan._parensNeeded( - threshold: Precedence.prefix, associative: true); - } - - @override - bool visitPropertyAccess(PropertyAccess node) { - if (identical(_target, node.target)) { - return _editPlan._parensNeeded( - threshold: Precedence.postfix, associative: true); - } else { - assert(identical(_target, node.propertyName)); - return _editPlan._parensNeeded( - threshold: Precedence.primary, associative: true); - } - } - - @override - bool visitThrowExpression(ThrowExpression node) { - assert(identical(_target, node.expression)); - return _editPlan._parensNeeded( - threshold: Precedence.assignment, - associative: true, - allowCascade: !_isRightmostDescendantOfCascadeSection(node)); - } - - /// Searches the ancestors of [node] to determine if it is the rightmost - /// descendant of a cascade section. (If this is the case, parentheses may be - /// required). The search is limited by [_cascadeSearchLimit]. - bool _isRightmostDescendantOfCascadeSection(AstNode node) { - while (true) { - var parent = node.parent; - if (parent == null) { - // No more ancestors, so we can stop. - return false; - } - if (parent is CascadeExpression && !identical(parent.target, node)) { - // Node is a cascade section. - return true; - } - if (parent.end != node.end) { - // Node is not the rightmost descendant of parent, so we can stop. - return false; - } - if (identical(node, _cascadeSearchLimit)) { - // We reached the cascade search limit so we don't have to look any - // further. - return false; - } - node = parent; - } - } -} - -class _PassThroughBuilderImpl implements PassThroughBuilder { - @override - final AstNode? node; - - /// The [EditPlan]s accumulated so far. - final List innerPlans = []; - - /// The [EditPlanner] currently being used to create this - /// [_PassThroughEditPlan]. - late EditPlanner planner; - - /// Determination of whether the resulting [EditPlan] will end in a cascade, - /// or `null` if it is not yet known. - bool? endsInCascade; - - /// The set of changes aggregated together so far. - Map>? changes; - - /// If [node] is a sequence, the list of its child nodes. Otherwise `null`. - List? sequenceNodes; - - /// If [node] is a sequence that uses separators (e.g. a list literal, which - /// uses comma separators), a list of its separators. Otherwise `null`. - List? separators; - - /// If [separators] is non-null, and nodes are being removed from the - /// sequence, this boolean indicates whether each node should be removed along - /// with the separator that *precedes* it. - /// - /// `false` indicates that each node should be removed along with the - /// separator that *follows* it. - bool removeLeadingSeparators = false; - - _PassThroughBuilderImpl(this.node); - - @override - void add(EditPlan innerPlan) { - assert(identical(innerPlan.parentNode, node)); - innerPlans.add(innerPlan); - } - - @override - NodeProducingEditPlan finish(EditPlanner planner) { - this.planner = planner; - var node = this.node; - if (node is ParenthesizedExpression) { - assert(innerPlans.length <= 1); - var innerPlan = innerPlans.isEmpty - ? planner.passThrough(node.expression) - : innerPlans[0]; - if (innerPlan is NodeProducingEditPlan) { - return _ProvisionalParenEditPlan(node, innerPlan); - } - } - - // Make a provisional determination of whether the result will end in a - // cascade. - // TODO(paulberry): can we make some of these computations lazy? - endsInCascade = node is CascadeExpression ? true : null; - sequenceNodes = EditPlanner._computeSequenceNodes(node); - separators = - sequenceNodes == null ? null : _computeSeparators(node, sequenceNodes); - _processPlans(); - Precedence precedence; - if (node is FunctionExpression && node.body is ExpressionFunctionBody) { - // To avoid ambiguities when adding `as Type` after a function expression, - // assume assignment precedence. - // TODO(paulberry): this is a hack - see - // https://github.com/dart-lang/sdk/issues/40536 - precedence = Precedence.assignment; - } else if (node is Expression) { - precedence = node.precedence; - } else { - precedence = Precedence.primary; - } - return _PassThroughEditPlan._( - node, precedence, endsInCascade ?? node!.endsInCascade, changes); - } - - /// Starting at index [planIndex] of [innerPlans] (whose value is [plan]), - /// scans forward to see if there is a range of inner plans that remove a - /// contiguous range of AST nodes. - /// - /// Returns the index into [innerPlans] of the last such contiguous plan, or - /// [planIndex] if a contiguous range of removals wasn't found. - int _findConsecutiveRemovals(int planIndex, _RemoveEditPlan plan) { - assert(identical(innerPlans[planIndex], plan)); - var lastRemovePlanIndex = planIndex; - var lastRemoveEditPlan = plan; - while (lastRemovePlanIndex + 1 < innerPlans.length) { - var nextPlan = innerPlans[lastRemovePlanIndex + 1]; - if (nextPlan is _RemoveEditPlan) { - if (nextPlan.firstChildIndex == lastRemoveEditPlan.lastChildIndex + 1) { - // Removals are consecutive. Slurp up. - lastRemovePlanIndex++; - lastRemoveEditPlan = nextPlan; - continue; - } - } - break; - } - return lastRemovePlanIndex; - } - - /// Processes an inner plan of type [NodeProducingEditPlan]. - void _handleNodeProducingEditPlan(NodeProducingEditPlan innerPlan) { - var parensNeeded = innerPlan.parensNeededFromContext(node)!; - assert(_checkParenLogic(innerPlan, parensNeeded)); - if (!parensNeeded && innerPlan is _ProvisionalParenEditPlan) { - var innerInnerPlan = innerPlan.innerPlan; - if (innerInnerPlan is _PassThroughEditPlan) { - // Input source code had redundant parens, so keep them. - parensNeeded = true; - } - } - changes += innerPlan._getChanges(parensNeeded); - // Note: we use innerPlan.sourceNode.end here instead of innerPlan.end, - // because what we care about is the input grammar, so we don't want to be - // fooled by any whitespace or comments included in the innerPlan. - if (endsInCascade == null && innerPlan.sourceNode!.end == node!.end) { - endsInCascade = !parensNeeded && innerPlan.endsInCascade; - } - } - - /// Processes one or more inner plans of type [_RemoveEditPlan], and returns - /// an updated [planIndex] pointing to the next inner plan to be processed. - /// - /// [firstPlan] should be the plan located at index [planIndex]. - int _handleRemoveEditPlans(_RemoveEditPlan firstPlan, int planIndex) { - assert(identical(innerPlans[planIndex], firstPlan)); - assert(identical(firstPlan.parentNode, node)); - var firstPlanIndex = planIndex; - var lastPlanIndex = _findConsecutiveRemovals(firstPlanIndex, firstPlan); - var lastPlan = innerPlans[lastPlanIndex] as _RemoveEditPlan; - int lastRemovalEnd; - int nextRemovalOffset; - removeLeadingSeparators = separators != null && - firstPlan.firstChildIndex != 0 && - lastPlan.lastChildIndex >= separators!.length; - if (planner.removeViaComments!) { - nextRemovalOffset = _removalOffset(firstPlan); - lastRemovalEnd = _removalEnd(lastPlan); - } else { - var firstRemovalOffset = _removalOffset(firstPlan); - var firstLineStart = planner._backToLineStart(firstRemovalOffset); - var startsOnLineBoundary = - planner._isWhitespaceRange(firstLineStart, firstRemovalOffset); - lastRemovalEnd = _removalEnd(lastPlan); - var lastLineEnd = planner._forwardToLineEnd(lastRemovalEnd); - var endsOnLineBoundary = - planner._isWhitespaceRange(lastRemovalEnd, lastLineEnd); - if (!endsOnLineBoundary) { - // E.g. removing B and C, and possibly A, from `A; B; C; D;`. Want to - // remove the whitespace after `C;`. - lastRemovalEnd = - planner._forwardAcrossWhitespace(lastRemovalEnd, lastLineEnd); - } else if (!startsOnLineBoundary) { - // E.g. removing B and C from `A; B; C;`. Want to remove the whitespace - // before `B`. - firstRemovalOffset = - planner._backAcrossWhitespace(firstRemovalOffset, firstLineStart); - } else { - // Removing whole lines. - firstRemovalOffset = firstLineStart; - lastRemovalEnd = lastLineEnd; - } - if (firstPlanIndex == 0 && lastPlanIndex == sequenceNodes!.length - 1) { - // We're removing everything. Try to remove additional whitespace so - // that we're left with just `()`, `{}`, or `[]`. - var candidateFirstRemovalOffset = planner._backAcrossWhitespace( - firstRemovalOffset, min(firstRemovalOffset, node!.offset)); - if (planner - ._isJustAfter(candidateFirstRemovalOffset, const ['(', '[', '{'])) { - var candidateLastRemovalEnd = - planner._forwardAcrossWhitespace(lastRemovalEnd, node!.end); - if (planner - ._isJustBefore(candidateLastRemovalEnd, const [')', ']', '}'])) { - firstRemovalOffset = candidateFirstRemovalOffset; - lastRemovalEnd = candidateLastRemovalEnd; - } - } - } - nextRemovalOffset = firstRemovalOffset; - } - - for (; planIndex <= lastPlanIndex; planIndex++) { - var innerPlan = innerPlans[planIndex] as _RemoveEditPlan; - var offset = nextRemovalOffset; - int end; - if (planIndex == lastPlanIndex) { - end = lastRemovalEnd; - } else { - var nextInnerPlan = innerPlans[planIndex + 1] as _RemoveEditPlan; - assert(identical(nextInnerPlan.parentNode, node)); - nextRemovalOffset = _removalOffset(nextInnerPlan); - if (planner.removeViaComments!) { - end = _removalEnd(innerPlans[planIndex] as _RemoveEditPlan); - } else { - var lineStart = planner._backToLineStart(nextRemovalOffset); - if (planner._isWhitespaceRange(lineStart, nextRemovalOffset)) { - // The next node to remove starts at the beginning of a line - // (possibly with whitespace before it). Consider the removal of - // the whitespace to be part of removing the next node. - nextRemovalOffset = lineStart; - } - end = nextRemovalOffset; - } - } - changes += _removeCode( - offset, - end, - planner.removeViaComments! - ? _RemovalStyle.spaceInsideComment - : _RemovalStyle.delete, - innerPlan.info); - } - - return planIndex; - } - - /// Walks through the plans in [innerPlans], adjusting them as necessary and - /// collecting their changes in [changes]. - void _processPlans() { - int planIndex = 0; - while (planIndex < innerPlans.length) { - var innerPlan = innerPlans[planIndex]; - if (innerPlan is NodeProducingEditPlan) { - _handleNodeProducingEditPlan(innerPlan); - planIndex++; - } else if (innerPlan is _RemoveEditPlan) { - planIndex = _handleRemoveEditPlans(innerPlan, planIndex); - } else if (innerPlan is _TokenChangePlan) { - changes += innerPlan.changes; - planIndex++; - } else { - throw UnimplementedError('Unrecognized inner plan type'); - } - } - } - - /// Computes the end for the text that should be removed by the given - /// [innerPlan]. - int _removalEnd(_RemoveEditPlan innerPlan) { - if (separators != null && - !removeLeadingSeparators && - innerPlan.lastChildIndex < separators!.length) { - return separators![innerPlan.lastChildIndex].end; - } else { - return sequenceNodes![innerPlan.lastChildIndex].end; - } - } - - /// Computes the offset for the text that should be removed by the given - /// [innerPlan]. - int _removalOffset(_RemoveEditPlan innerPlan) { - if (separators != null && removeLeadingSeparators) { - return separators![innerPlan.firstChildIndex - 1].offset; - } else { - return sequenceNodes![innerPlan.firstChildIndex].offset; - } - } - - static bool _checkParenLogic(EditPlan innerPlan, bool parensNeeded) { - if (innerPlan is _SimpleEditPlan && innerPlan._innerChanges == null) { - if (innerPlan.sourceNode is FunctionExpression) { - // Skip parentheses check for function expressions; it produces false - // failures when examining an expression like `x ?? (y) => z`, due to - // https://github.com/dart-lang/sdk/issues/40536. - // TODO(paulberry): fix this. - } else { - assert( - !parensNeeded, - "Code prior to fixes didn't need parens here, " - "shouldn't need parens now."); - } - } - return true; - } - - /// Compute the set of tokens used by the given [parent] node to separate its - /// [childNodes]. - static List? _computeSeparators( - AstNode? parent, List? childNodes) { - if (parent is Block || - parent is ClassDeclaration || - parent is CompilationUnit || - parent is FormalParameter || - parent is MethodDeclaration) { - // These parent types don't use separators. - return null; - } else { - var result = []; - for (var child in childNodes!) { - var separator = child.endToken.next; - if (separator != null && separator.type == TokenType.COMMA) { - result.add(separator); - } - } - assert(result.length == childNodes.length || - result.length == childNodes.length - 1); - return result; - } - } -} - -/// [EditPlan] representing an AstNode that is not to be changed, but may have -/// some changes applied to some of its descendants. -class _PassThroughEditPlan extends _SimpleEditPlan { - _PassThroughEditPlan._( - super.node, super.precedence, super.endsInCascade, super.innerChanges); -} - -/// [EditPlan] applying to a [ParenthesizedExpression]. Unlike the normal -/// behavior of adding parentheses when needed, [_ProvisionalParenEditPlan] -/// preserves existing parens if they are needed, and removes them if they are -/// not. -/// -/// Defers computation of whether parentheses are needed to the inner plan. -class _ProvisionalParenEditPlan extends _NestedEditPlan { - /// Creates a new edit plan that consists of executing [innerPlan], and then - /// possibly removing surrounding parentheses from the source code. - /// - /// Caller should not re-use [innerPlan] after this call--it (and the data - /// structures it points to) may be incorporated into this edit plan and later - /// modified. - _ProvisionalParenEditPlan( - ParenthesizedExpression super.node, super.innerPlan); - - @override - Map>? _getChanges(bool parens) { - var changes = innerPlan._getChanges(false); - if (!parens) { - changes ??= {}; - (changes[offset] ??= []).insert(0, const AtomicEdit.delete(1)); - (changes[end! - 1] ??= []).add(const AtomicEdit.delete(1)); - } - return changes; - } -} - -/// Enum used by [_ExtractEditPlan._removeCode] to describe how code should be -/// removed. -enum _RemovalStyle { - /// Code should be removed by commenting it out. Inserted comment delimiters - /// should be a comment delimiter followed by a space (i.e. `/* ` and `*/ `). - commentSpace, - - /// Code should be removed by deleting it. - delete, - - /// Code should be removed by commenting it out. Inserted comment delimiters - /// should be a space followed by a comment delimiter (i.e. ` /*` and ` */`). - spaceComment, - - /// Code should be removed by commenting it out. Inserted comment delimiters - /// should have a space inside the comment. - spaceInsideComment, -} - -/// [EditPlan] representing one or more AstNodes that are to be removed from -/// their (common) parent, which must be an AST node that stores a list of -/// sub-nodes. -/// -/// If more than one node is to be removed by this [EditPlan], they must be -/// contiguous. -class _RemoveEditPlan extends EditPlan { - @override - final AstNode? parentNode; - - /// Index of the node to be removed within the parent. - final int firstChildIndex; - - /// Index of the node to be removed within the parent. - final int lastChildIndex; - - final AtomicEditInfo? info; - - _RemoveEditPlan( - this.parentNode, this.firstChildIndex, this.lastChildIndex, this.info) - : super._(); -} - -/// Implementation of [EditPlan] underlying simple cases where no computation -/// needs to be deferred. -class _SimpleEditPlan extends NodeProducingEditPlan { - final Precedence _precedence; - - @override - final bool endsInCascade; - - final Map>? _innerChanges; - - bool _finalized = false; - - _SimpleEditPlan( - super.node, this._precedence, this.endsInCascade, this._innerChanges) - : super._(); - - @override - Map>? _getChanges(bool parens) { - assert(!_finalized); - _finalized = true; - return parens ? _createAddParenChanges(_innerChanges) : _innerChanges; - } - - @override - bool _parensNeeded( - {required Precedence threshold, - bool associative = false, - bool allowCascade = false}) { - if (endsInCascade && !allowCascade) return true; - if (_precedence < threshold) return true; - if (_precedence == threshold && !associative) return true; - return false; - } -} - -/// [EditPlan] representing a change (or changes) to be made to a token in the -/// [parentNode]. -/// -/// This is used, for example, to change the `?.` token of a [MethodInvocation] -/// or [PropertyAccess] to `.`. -class _TokenChangePlan extends EditPlan { - @override - final AstNode parentNode; - - /// The changes to be made. - final Map> changes; - - _TokenChangePlan(this.parentNode, this.changes) : super._(); -} - -/// Extension containing useful operations on a list of [AtomicEdit]s. -extension AtomicEditList on List { - /// Converts a list of [AtomicEdits] to a single [SourceEdit] by concatenating - /// them. - /// - /// If [includeInformative] is `true`, informative edits are included; - /// otherwise they are ignored. - SourceEdit toSourceEdit(int offset, {bool includeInformative = false}) { - var totalLength = 0; - var replacement = ''; - for (var edit in this) { - if (!edit.isInformative || includeInformative) { - totalLength += edit.length; - replacement += edit.replacement; - } - } - return SourceEdit(offset, totalLength, replacement); - } -} - -/// Extension containing useful operations on a map from offsets to lists of -/// [AtomicEdit]s. This data structure is used by [EditPlan]s to accumulate -/// source file changes. -extension AtomicEditMap on Map>? { - /// Destructively combines two change representations. If one or the other - /// input is null, the other input is returned unchanged for efficiency. - Map>? operator +( - Map>? newChanges) { - if (newChanges == null) return this; - if (this == null) { - return newChanges; - } else { - for (var entry in newChanges.entries) { - var currentValue = this![entry.key]; - if (currentValue == null) { - this![entry.key] = entry.value; - } else { - currentValue.addAll(entry.value); - } - } - return this; - } - } - - /// Applies the changes to source file text. - /// - /// If [includeInformative] is `true`, informative edits are included; - /// otherwise they are ignored. - String applyTo(String code, {bool includeInformative = false}) { - return SourceEdit.applySequence( - code, toSourceEdits(includeInformative: includeInformative)); - } - - /// Converts the changes to a list of [SourceEdit]s. The list is reverse - /// sorted by offset so that they can be applied in order. - /// - /// If [includeInformative] is `true`, informative edits are included; - /// otherwise they are ignored. - List toSourceEdits({bool includeInformative = false}) { - return [ - for (var offset in this!.keys.toList()..sort((a, b) => b!.compareTo(a!))) - this![offset]! - .toSourceEdit(offset!, includeInformative: includeInformative) - ]; - } -} - -/// Extension allowing an AstNode to be queried to see if it ends in a cascade -/// expression. -extension EndsInCascadeExtension on AstNode { - @visibleForTesting - bool get endsInCascade { - var visitor = _EndsInCascadeVisitor(end); - accept(visitor); - return visitor.endsInCascade; - } -} diff --git a/pkg/nnbd_migration/lib/src/exceptions.dart b/pkg/nnbd_migration/lib/src/exceptions.dart deleted file mode 100644 index e6493cc7f255..000000000000 --- a/pkg/nnbd_migration/lib/src/exceptions.dart +++ /dev/null @@ -1,33 +0,0 @@ -import 'package:analyzer/dart/analysis/results.dart'; -import 'package:nnbd_migration/src/messages.dart'; - -/// A [StateError] specific to the ways that the NNBD experiment can be -/// misconfigured which may prevent the tool from working. -class ExperimentStatusException extends StateError { - /// The SDK was analyzed without NNBD semantics. - ExperimentStatusException.sdkExperimentDisabled() : super(nnbdExperimentOff); - - /// The SDK does not contain the NNBD sources, it is the pre-unfork copy. - ExperimentStatusException.sdkPreforkSources() : super(sdkNnbdOff); - - /// The user's code imports unmigrated dependencies. - ExperimentStatusException.unmigratedDependencies(List uris) - : super(unmigratedDependenciesError(uris)); - - /// Throw an [ExperimentStatusException] if the [result] seems to have - /// incorrectly configured experiment flags/nnbd sources. - static void sanityCheck(ResolvedUnitResult result) { - final equalsParamType = result.typeProvider.objectType - .getMethod('==')! - .parameters[0] - .type - .getDisplayString(withNullability: true); - if (equalsParamType == 'Object*') { - throw ExperimentStatusException.sdkExperimentDisabled(); - } - - if (equalsParamType != 'Object') { - throw ExperimentStatusException.sdkPreforkSources(); - } - } -} diff --git a/pkg/nnbd_migration/lib/src/expression_checks.dart b/pkg/nnbd_migration/lib/src/expression_checks.dart deleted file mode 100644 index 428bd779c87b..000000000000 --- a/pkg/nnbd_migration/lib/src/expression_checks.dart +++ /dev/null @@ -1,41 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:nnbd_migration/fix_reason_target.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/src/edge_origin.dart'; -import 'package:nnbd_migration/src/nullability_node.dart'; - -/// Container for information gathered during nullability migration about the -/// set of runtime checks that might need to be performed on the value of an -/// expression. -/// -/// TODO(paulberry): we don't currently have any way of distinguishing checks -/// based on the nullability of the type itself (which can be checked by adding -/// a trailing `!`) from checks based on type parameters (which will have to be -/// checked using an `as` expression). -class ExpressionChecks { - /// All nullability edges that are related to this potential check. - final Map edges = {}; - - ExpressionChecks(); -} - -/// [EdgeOrigin] object associated with [ExpressionChecks]. This is a separate -/// object so that it can safely store a pointer to an AST node. (We don't want -/// to store pointers to AST nodes in [ExpressionChecks] objects because they -/// are persisted for the duration of the migration calculation). -class ExpressionChecksOrigin extends EdgeOrigin { - final ExpressionChecks checks; - - ExpressionChecksOrigin(super.source, Expression? super.node, this.checks, - {super.isSetupAssignment = false}); - - @override - String get description => 'data flow'; - - @override - EdgeOriginKind get kind => EdgeOriginKind.expressionChecks; -} diff --git a/pkg/nnbd_migration/lib/src/fix_aggregator.dart b/pkg/nnbd_migration/lib/src/fix_aggregator.dart deleted file mode 100644 index d44fc54d0ee3..000000000000 --- a/pkg/nnbd_migration/lib/src/fix_aggregator.dart +++ /dev/null @@ -1,1518 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/ast/token.dart'; -import 'package:analyzer/dart/ast/visitor.dart'; -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/dart/element/nullability_suffix.dart'; -import 'package:analyzer/dart/element/type.dart'; -import 'package:analyzer/src/dart/ast/ast.dart'; -import 'package:meta/meta.dart'; -import 'package:nnbd_migration/fix_reason_target.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; -import 'package:nnbd_migration/src/decorated_type.dart'; -import 'package:nnbd_migration/src/edit_plan.dart'; -import 'package:nnbd_migration/src/fix_builder.dart'; -import 'package:nnbd_migration/src/utilities/hint_utils.dart'; - -/// Base class representing a change that might need to be made to an -/// expression. -abstract class ExpressionChange { - /// The type of the expression after the change is applied. - final DartType resultType; - - ExpressionChange(this.resultType); - - /// Description of the change. - NullabilityFixDescription get description; - - /// Creates a [NodeProducingEditPlan] that applies the change to [innerPlan]. - NodeProducingEditPlan applyExpression(FixAggregator aggregator, - NodeProducingEditPlan innerPlan, AtomicEditInfo? info); - - /// Creates a string that applies the change to the [inner] text string. - String applyText(FixAggregator aggregator, String inner); - - /// Describes the change, for use in debugging. - String describe(); -} - -/// Visitor that combines together the changes produced by [FixBuilder] into a -/// concrete set of source code edits using the infrastructure of [EditPlan]. -class FixAggregator extends UnifyingAstVisitor { - /// Map from the [AstNode]s that need to have changes made, to the changes - /// that need to be applied to them. - final Map _changes; - - /// The set of [EditPlan]s being accumulated. - List _plans = []; - - final EditPlanner planner; - - /// Map from library to the prefix we should use when inserting code that - /// refers to it. - final Map _importPrefixes = {}; - - final bool _warnOnWeakCode; - - FixAggregator._(this.planner, this._changes, this._warnOnWeakCode, - CompilationUnitElement compilationUnitElement) { - for (var importElement in compilationUnitElement.library.libraryImports) { - // TODO(paulberry): the `??=` should ensure that if there are two imports, - // one prefixed and one not, we prefer the prefix. Test this. - _importPrefixes[importElement.importedLibrary] ??= - importElement.prefix?.element.name; - } - } - - /// Creates the necessary Dart code to refer to the given element, using an - /// import prefix if necessary. - /// - /// TODO(paulberry): if the element is not currently imported, we should - /// update or add an import statement as necessary. - String? elementToCode(Element element) { - var name = element.name; - var library = element.library; - var prefix = _importPrefixes[library]; - if (prefix != null) { - return '$prefix.$name'; - } else { - return name; - } - } - - /// Gathers all the changes to nodes descended from [node] into a single - /// [EditPlan]. - NodeProducingEditPlan innerPlanForNode(AstNode node) { - var innerPlans = innerPlansForNode(node); - return planner.passThrough(node, innerPlans: innerPlans); - } - - /// Gathers all the changes to nodes descended from [node] into a list of - /// [EditPlan]s, one for each change. - List innerPlansForNode(AstNode node) { - var previousPlans = _plans; - try { - _plans = []; - node.visitChildren(this); - return _plans; - } finally { - _plans = previousPlans; - } - } - - /// Gathers all the changes to [node] and its descendants into a single - /// [EditPlan]. - EditPlan planForNode(AstNode? node) { - var change = _changes[node]; - if (change != null) { - return change._apply(node!, this); - } else { - return planner.passThrough(node, innerPlans: innerPlansForNode(node!)); - } - } - - /// Creates a string representation of the given type parameter element, - /// suitable for inserting into the user's source code. - String typeFormalToCode(TypeParameterElement formal) { - var bound = formal.bound; - if (bound == null || - bound is DynamicType || - (bound.isDartCoreObject && - bound.nullabilitySuffix != NullabilitySuffix.none)) { - return formal.name; - } - return '${formal.name} extends ${typeToCode(bound)}'; - } - - String typeToCode(DartType type) { - // TODO(paulberry): is it possible to share code with DartType.toString() - // somehow? - String suffix = - type.nullabilitySuffix == NullabilitySuffix.question ? '?' : ''; - if (type is InterfaceType) { - var name = elementToCode(type.element); - var typeArguments = type.typeArguments; - if (typeArguments.isEmpty) { - return '$name$suffix'; - } else { - var args = [for (var arg in typeArguments) typeToCode(arg)].join(', '); - return '$name<$args>$suffix'; - } - } else if (type is FunctionType) { - var buffer = StringBuffer(); - buffer.write(typeToCode(type.returnType)); - buffer.write(' Function'); - var typeFormals = type.typeFormals; - if (typeFormals.isNotEmpty) { - var formals = [for (var formal in typeFormals) typeFormalToCode(formal)] - .join(', '); - buffer.write('<$formals>'); - } - buffer.write('('); - String optionalOrNamedCloser = ''; - bool commaNeeded = false; - for (var parameter in type.parameters) { - if (commaNeeded) { - buffer.write(', '); - } else { - commaNeeded = true; - } - if (optionalOrNamedCloser.isEmpty && !parameter.isRequiredPositional) { - if (parameter.isPositional) { - buffer.write('['); - optionalOrNamedCloser = ']'; - } else { - buffer.write('{'); - optionalOrNamedCloser = '}'; - } - } - buffer.write(typeToCode(parameter.type)); - if (parameter.isNamed) { - buffer.write(' ${parameter.name}'); - } - } - buffer.write(optionalOrNamedCloser); - buffer.write(')'); - buffer.write(suffix); - return buffer.toString(); - } else { - return type.toString(); - } - } - - @override - void visitNode(AstNode node) { - var change = _changes[node]; - if (change != null) { - var innerPlan = change._apply(node, this); - _plans.add(innerPlan); - } else { - node.visitChildren(this); - } - } - - /// Runs the [FixAggregator] on a [unit] and returns the resulting edits. - static Map>? run(CompilationUnit unit, - String? sourceText, Map changes, - {bool? removeViaComments = false, bool warnOnWeakCode = false}) { - var planner = EditPlanner(unit.lineInfo, sourceText, - removeViaComments: removeViaComments); - var aggregator = FixAggregator._( - planner, changes, warnOnWeakCode, unit.declaredElement!); - unit.accept(aggregator); - if (aggregator._plans.isEmpty) return {}; - EditPlan plan; - if (aggregator._plans.length == 1) { - plan = aggregator._plans[0]; - } else { - plan = planner.passThrough(unit, innerPlans: aggregator._plans); - } - return planner.finalize(plan); - } -} - -/// [ExpressionChange] describing the addition of an `as` cast to an expression. -class IntroduceAsChange extends ExpressionChange { - /// The type being cast to. - final DartType type; - - /// Indicates whether this is a downcast. - final bool isDowncast; - - IntroduceAsChange(this.type, {required this.isDowncast}) : super(type); - - @override - NullabilityFixDescription get description => isDowncast - ? NullabilityFixDescription.downcastExpression - : NullabilityFixDescription.otherCastExpression; - - @override - NodeProducingEditPlan applyExpression(FixAggregator aggregator, - NodeProducingEditPlan innerPlan, AtomicEditInfo? info) => - aggregator.planner.addBinaryPostfix( - innerPlan, TokenType.AS, aggregator.typeToCode(type), - info: info); - - @override - String applyText(FixAggregator aggregator, String inner) => - '$inner as ${aggregator.typeToCode(type)}'; - - @override - String describe() => 'IntroduceAsChange($type)'; -} - -/// [ExpressionChange] describing the addition of an `as` cast to an expression -/// having a Future type. -class IntroduceThenChange extends ExpressionChange { - /// The change that should be made to the value the future completes with. - final ExpressionChange innerChange; - - IntroduceThenChange(super.resultType, this.innerChange); - - @override - NullabilityFixDescription get description => - NullabilityFixDescription.addThen; - - @override - NodeProducingEditPlan applyExpression(FixAggregator aggregator, - NodeProducingEditPlan innerPlan, AtomicEditInfo? info) => - aggregator.planner.addPostfix(innerPlan, - '.then((value) => ${innerChange.applyText(aggregator, 'value')})', - info: info); - - @override - String applyText(FixAggregator aggregator, String inner) => - '$inner.then((value) => ${innerChange.applyText(aggregator, 'value')})'; - - @override - String describe() => 'IntroduceThenChange($innerChange)'; -} - -/// Reasons that a variable declaration is to be made late. -enum LateAdditionReason { - /// It was inferred that the associated variable declaration is to be made - /// late through the late-inferring algorithm. - inference, - - /// It was inferred that the associated variable declaration is to be made - /// late, because it is a test variable which is assigned during setup. - testVariableInference, -} - -/// Base class representing a kind of change that [FixAggregator] might make to -/// a particular AST node. -abstract class NodeChange { - NodeChange._(); - - /// Indicates whether this node exists solely to provide informative - /// information. - bool get isInformative => false; - - Iterable get _toStringParts => const []; - - @override - String toString() => '$runtimeType(${_toStringParts.join(', ')})'; - - /// Applies this change to the given [node], producing an [EditPlan]. The - /// [aggregator] may be used to gather up any edits to the node's descendants - /// into their own [EditPlan]s. - /// - /// Note: the reason the caller can't just gather up the edits and pass them - /// in is that some changes don't preserve all of the structure of the nodes - /// below them (e.g. dropping an unnecessary cast), so those changes need to - /// be able to call the appropriate [aggregator] methods just on the nodes - /// they need. - /// - /// May return `null` if no changes need to be made. - EditPlan _apply(N node, FixAggregator aggregator); - - /// Creates the appropriate specialized kind of [NodeChange] appropriate for - /// the given [node]. - static NodeChange? create(AstNode node) => - node.accept(_NodeChangeVisitor._instance); -} - -/// Implementation of [NodeChange] specialized for operating on [Annotation] -/// nodes. -class NodeChangeForAnnotation extends NodeChange { - /// Indicates whether the node should be changed into a `required` keyword. - bool changeToRequiredKeyword = false; - - /// If [changeToRequiredKeyword] is `true`, the information that should be - /// contained in the edit. - AtomicEditInfo? changeToRequiredKeywordInfo; - - NodeChangeForAnnotation() : super._(); - - @override - Iterable get _toStringParts => - [if (changeToRequiredKeyword) 'changeToRequiredKeyword']; - - @override - EditPlan _apply(Annotation node, FixAggregator aggregator) { - if (!changeToRequiredKeyword) { - return aggregator.innerPlanForNode(node); - } - var name = node.name; - if (name is PrefixedIdentifier) { - name = name.identifier; - } - if (aggregator.planner.sourceText!.substring(name.offset, name.end) == - 'required') { - // The text `required` already exists in the annotation; we can just - // extract it. - return aggregator.planner.extract( - node, aggregator.planForNode(name) as NodeProducingEditPlan, - infoBefore: changeToRequiredKeywordInfo, alwaysDelete: true); - } else { - return aggregator.planner.replace(node, - [AtomicEdit.insert('required', info: changeToRequiredKeywordInfo)]); - } - } -} - -/// Implementation of [NodeChange] specialized for operating on [ArgumentList] -/// nodes. -class NodeChangeForArgumentList extends NodeChange { - /// Map whose keys are the arguments that should be dropped from this argument - /// list, if any. Values are info about why the arguments are being dropped. - final Map _argumentsToDrop = {}; - - NodeChangeForArgumentList() : super._(); - - /// Queries the map whose keys are the arguments that should be dropped from - /// this argument list, if any. Values are info about why the arguments are - /// being dropped. - @visibleForTesting - Map get argumentsToDrop => _argumentsToDrop; - - @override - Iterable get _toStringParts => - [if (_argumentsToDrop.isNotEmpty) 'argumentsToDrop: $_argumentsToDrop']; - - /// Updates `this` so that the given [argument] will be dropped, using [info] - /// to annotate the reason why it is being dropped. - void dropArgument(Expression argument, AtomicEditInfo? info) { - assert(!_argumentsToDrop.containsKey(argument)); - _argumentsToDrop[argument] = info; - } - - @override - EditPlan _apply(ArgumentList node, FixAggregator aggregator) { - assert(_argumentsToDrop.keys.every((e) => identical(e.parent, node))); - List innerPlans = []; - for (var argument in node.arguments) { - if (_argumentsToDrop.containsKey(argument)) { - innerPlans.add(aggregator.planner - .removeNode(argument, info: _argumentsToDrop[argument])); - } else { - innerPlans.add(aggregator.planForNode(argument)); - } - } - return aggregator.planner.passThrough(node, innerPlans: innerPlans); - } -} - -/// Implementation of [NodeChange] specialized for operating on [AsExpression] -/// nodes. -class NodeChangeForAsExpression extends NodeChangeForExpression { - /// Indicates whether the cast should be removed. - bool removeAs = false; - - @override - Iterable get _toStringParts => - [...super._toStringParts, if (removeAs) 'removeAs']; - - @override - EditPlan _apply(AsExpression node, FixAggregator aggregator) { - if (removeAs) { - return aggregator.planner.extract(node, - aggregator.planForNode(node.expression) as NodeProducingEditPlan, - infoAfter: - AtomicEditInfo(NullabilityFixDescription.removeAs, const {})); - } else { - return super._apply(node, aggregator); - } - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [AssignmentExpression] nodes. -class NodeChangeForAssignment - extends NodeChangeForExpression - with NodeChangeForAssignmentLike { - /// Indicates whether the user should be warned that the assignment is a - /// null-aware assignment that will have no effect when strong checking is - /// enabled. - bool isWeakNullAware = false; - - @override - Iterable get _toStringParts => - [...super._toStringParts, if (isWeakNullAware) 'isWeakNullAware']; - - @override - NodeProducingEditPlan _apply( - AssignmentExpression node, FixAggregator aggregator) { - var lhsPlan = aggregator.planForNode(node.leftHandSide); - if (isWeakNullAware && !aggregator._warnOnWeakCode) { - // Just keep the LHS - return aggregator.planner.extract(node, lhsPlan as NodeProducingEditPlan, - infoAfter: AtomicEditInfo( - NullabilityFixDescription.removeNullAwareAssignment, const {})); - } - var operatorPlan = _makeOperatorPlan(aggregator, node, node.operator); - var rhsPlan = aggregator.planForNode(node.rightHandSide); - var innerPlans = [ - lhsPlan, - if (operatorPlan != null) operatorPlan, - rhsPlan - ]; - return _applyExpression(aggregator, - aggregator.planner.passThrough(node, innerPlans: innerPlans)); - } - - EditPlan? _makeOperatorPlan( - FixAggregator aggregator, AssignmentExpression node, Token operator) { - var operatorPlan = super._makeOperatorPlan(aggregator, node, operator); - if (operatorPlan != null) return operatorPlan; - if (isWeakNullAware) { - assert(aggregator._warnOnWeakCode); - return aggregator.planner.informativeMessageForToken(node, operator, - info: AtomicEditInfo( - NullabilityFixDescription - .nullAwareAssignmentUnnecessaryInStrongMode, - const {})); - } else { - return null; - } - } -} - -/// Common behaviors for expressions that can represent an assignment (possibly -/// through desugaring). -mixin NodeChangeForAssignmentLike - on NodeChangeForExpression { - /// Indicates whether the user should be warned that the assignment has a - /// bad combined type (the return type of the combiner isn't assignable to the - /// write type of the target). - bool hasBadCombinedType = false; - - /// Indicates whether the user should be warned that the assignment has a - /// nullable source type. - bool hasNullableSource = false; - - @override - Iterable get _toStringParts => [ - ...super._toStringParts, - if (hasBadCombinedType) 'hasBadCombinedType', - if (hasNullableSource) 'hasNullableSource' - ]; - - EditPlan? _makeOperatorPlan( - FixAggregator aggregator, N node, Token operator) { - if (hasNullableSource) { - return aggregator.planner.informativeMessageForToken(node, operator, - info: AtomicEditInfo( - NullabilityFixDescription.compoundAssignmentHasNullableSource, - const {})); - } else if (hasBadCombinedType) { - return aggregator.planner.informativeMessageForToken(node, operator, - info: AtomicEditInfo( - NullabilityFixDescription.compoundAssignmentHasBadCombinedType, - const {})); - } else { - return null; - } - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [CompilationUnit] nodes. -class NodeChangeForCompilationUnit extends NodeChange { - /// A map of the imports that should be added, or the empty map if no imports - /// should be added. - /// - /// Each import is expressed as a map entry whose key is the URI to import and - /// whose value is the set of symbols to show. - final Map> _addImports = {}; - - bool removeLanguageVersionComment = false; - - NodeChangeForCompilationUnit() : super._(); - - /// Queries a map of the imports that should be added, or the empty map if no - /// imports should be added. - /// - /// Each import is expressed as a map entry whose key is the URI to import and - /// whose value is the set of symbols to show. - @visibleForTesting - Map> get addImports => _addImports; - - @override - Iterable get _toStringParts => [ - if (_addImports.isNotEmpty) 'addImports: $_addImports', - if (removeLanguageVersionComment) 'removeLanguageVersionComment' - ]; - - /// Updates `this` so that an import of [uri] will be added, showing [name]. - void addImport(String uri, String name) { - (_addImports[uri] ??= {}).add(name); - } - - @override - EditPlan _apply(CompilationUnit node, FixAggregator aggregator) { - List innerPlans = []; - if (removeLanguageVersionComment) { - final comment = (node as CompilationUnitImpl).languageVersionToken!; - innerPlans.add(aggregator.planner.replaceToken(node, comment, '', - info: AtomicEditInfo( - NullabilityFixDescription.removeLanguageVersionComment, - const {}))); - } - _processDirectives(node, aggregator, innerPlans); - for (var declaration in node.declarations) { - innerPlans.add(aggregator.planForNode(declaration)); - } - return aggregator.planner.passThrough(node, innerPlans: innerPlans); - } - - /// Adds the necessary inner plans to [innerPlans] for the directives part of - /// [node]. This solely involves adding imports. - void _processDirectives(CompilationUnit node, FixAggregator aggregator, - List innerPlans) { - List>> importsToAdd = - _addImports.entries.toList(); - importsToAdd.sort((x, y) => x.key.compareTo(y.key)); - - void insertImport(int offset, MapEntry> importToAdd, - {String prefix = '', String suffix = '\n'}) { - var shownNames = importToAdd.value.toList(); - shownNames.sort(); - innerPlans.add(aggregator.planner.insertText(node, offset, [ - if (prefix.isNotEmpty) AtomicEdit.insert(prefix), - AtomicEdit.insert( - "import '${importToAdd.key}' show ${shownNames.join(', ')};", - info: AtomicEditInfo(NullabilityFixDescription.addImport, {})), - if (suffix.isNotEmpty) AtomicEdit.insert(suffix) - ])); - } - - if (node.directives.every((d) => d is LibraryDirective)) { - while (importsToAdd.isNotEmpty) { - insertImport( - node.declarations.beginToken!.offset, importsToAdd.removeAt(0), - suffix: importsToAdd.isEmpty ? '\n\n' : '\n'); - } - } else { - for (var directive in node.directives) { - while (importsToAdd.isNotEmpty && - _shouldImportGoBefore(importsToAdd.first.key, directive)) { - insertImport(directive.offset, importsToAdd.removeAt(0)); - } - innerPlans.add(aggregator.planForNode(directive)); - } - while (importsToAdd.isNotEmpty) { - insertImport(node.directives.last.end, importsToAdd.removeAt(0), - prefix: '\n', suffix: ''); - } - } - } - - /// Determines whether a new import of [newImportUri] should be sorted before - /// an existing [directive]. - bool _shouldImportGoBefore(String newImportUri, Directive directive) { - if (directive is ImportDirective) { - return newImportUri.compareTo(directive.uri.stringValue!) < 0; - } else if (directive is LibraryDirective) { - // Library directives must come before imports. - return false; - } else { - // Everything else tends to come after imports. - return true; - } - } -} - -/// Common infrastructure used by [NodeChange] objects that operate on AST nodes -/// with conditional behavior (if statements, if elements, and conditional -/// expressions). -mixin NodeChangeForConditional on NodeChange { - /// If not `null`, indicates that the condition expression is known to - /// evaluate to either `true` or `false`, so the other branch of the - /// conditional is dead code and should be eliminated. - bool? conditionValue; - - /// If [conditionValue] is not `null`, the reason that should be included in - /// the [AtomicEditInfo] for the edit that removes the dead code. - FixReasonInfo? conditionReason; - - @override - Iterable get _toStringParts => - [...super._toStringParts, if (conditionValue != null) 'conditionValue']; - - /// If dead code removal is warranted for [node], returns an [EditPlan] that - /// removes the dead code (and performs appropriate updates within any - /// descendant AST nodes that remain). Otherwise returns `null`. - EditPlan? _applyConditional(N node, FixAggregator aggregator, - AstNode conditionNode, AstNode thenNode, AstNode? elseNode) { - if (conditionValue == null) return null; - if (aggregator._warnOnWeakCode) { - var conditionPlan = aggregator.innerPlanForNode(conditionNode); - var info = AtomicEditInfo( - conditionValue! - ? NullabilityFixDescription.conditionTrueInStrongMode - : NullabilityFixDescription.conditionFalseInStrongMode, - {FixReasonTarget.root: conditionReason}); - var commentedConditionPlan = aggregator.planner.addCommentPostfix( - conditionPlan, '/* == $conditionValue */', - info: info, isInformative: true); - return aggregator.planner.passThrough(node, innerPlans: [ - commentedConditionPlan, - aggregator.planForNode(thenNode), - if (elseNode != null) aggregator.planForNode(elseNode) - ]); - } - AstNode? nodeToKeep; - NullabilityFixDescription descriptionBefore, descriptionAfter; - if (conditionValue!) { - nodeToKeep = thenNode; - descriptionBefore = NullabilityFixDescription.discardCondition; - if (elseNode == null) { - descriptionAfter = descriptionBefore; - } else { - descriptionAfter = NullabilityFixDescription.discardElse; - } - } else { - nodeToKeep = elseNode; - descriptionBefore = - descriptionAfter = NullabilityFixDescription.discardThen; - } - if (nodeToKeep == null || - nodeToKeep is Block && nodeToKeep.statements.isEmpty) { - // The conditional node collapses to a no-op, so try to remove it - // entirely. - var info = AtomicEditInfo(NullabilityFixDescription.discardIf, - {FixReasonTarget.root: conditionReason}); - var removeNode = aggregator.planner.tryRemoveNode(node, info: info); - if (removeNode != null) { - return removeNode; - } else { - // We can't remove the node because it's not inside a sequence, so we - // have to create a suitable replacement. - if (node is IfStatement) { - return aggregator.planner - .replace(node, [AtomicEdit.insert('{}', info: info)], info: info); - } else if (node is IfElement) { - return aggregator.planner.replace( - node, [AtomicEdit.insert('...{}', info: info)], - info: info); - } else { - // We should never get here; the only types of conditional nodes that - // can wind up collapsing to a no-op are if statements and if - // elements. - throw StateError( - 'Unexpected node type collapses to no-op: ${node.runtimeType}'); - } - } - } - var infoBefore = AtomicEditInfo( - descriptionBefore, {FixReasonTarget.root: conditionReason}); - var infoAfter = AtomicEditInfo( - descriptionAfter, {FixReasonTarget.root: conditionReason}); - if (nodeToKeep is Block && nodeToKeep.statements.length == 1) { - var singleStatement = nodeToKeep.statements[0]; - if (singleStatement is VariableDeclarationStatement) { - // It's not safe to eliminate the {} because it increases the scope of - // the variable declarations - } else { - nodeToKeep = singleStatement; - } - } - return aggregator.planner.extract( - node, aggregator.planForNode(nodeToKeep) as NodeProducingEditPlan, - infoBefore: infoBefore, infoAfter: infoAfter); - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [ConditionalExpression] nodes. -class NodeChangeForConditionalExpression - extends NodeChangeForExpression - with NodeChangeForConditional { - @override - EditPlan _apply(ConditionalExpression node, FixAggregator aggregator) { - return _applyConditional(node, aggregator, node.condition, - node.thenExpression, node.elseExpression) ?? - super._apply(node, aggregator); - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [DefaultFormalParameter] nodes. -class NodeChangeForDefaultFormalParameter - extends NodeChange { - /// Indicates whether a `required` keyword should be added to this node. - bool addRequiredKeyword = false; - - /// If [addRequiredKeyword] is `true`, the information that should be - /// contained in the edit. - AtomicEditInfo? addRequiredKeywordInfo; - - /// If [addRequiredKeyword] is `true`, and there is a `/*required*/` hint, - /// the hint comment that should be converted into a simple `required` string. - HintComment? requiredHint; - - /// If non-null, indicates a `@required` annotation which should be removed - /// from this node. - Annotation? annotationToRemove; - - /// If [annotationToRemove] is non-null, the information that should be - /// contained in the edit. - AtomicEditInfo? removeAnnotationInfo; - - NodeChangeForDefaultFormalParameter() : super._(); - - @override - Iterable get _toStringParts => - [if (addRequiredKeyword) 'addRequiredKeyword']; - - @override - EditPlan _apply(DefaultFormalParameter node, FixAggregator aggregator) { - if (!addRequiredKeyword) return aggregator.innerPlanForNode(node); - - if (requiredHint != null) { - var innerPlan = aggregator.innerPlanForNode(node); - return aggregator.planner.acceptPrefixHint(innerPlan, requiredHint!, - info: addRequiredKeywordInfo); - } - - var offset = node.firstTokenAfterCommentAndMetadata!.offset; - return aggregator.planner.passThrough(node, innerPlans: [ - aggregator.planner.insertText(node, offset, [ - AtomicEdit.insert('required ', info: addRequiredKeywordInfo), - ]), - if (annotationToRemove != null) - aggregator.planner - .removeNode(annotationToRemove!, info: removeAnnotationInfo), - ...aggregator.innerPlansForNode(node), - ]); - } -} - -/// Implementation of [NodeChange] specialized for operating on [Expression] -/// nodes. -class NodeChangeForExpression extends NodeChange { - /// The list of [ExpressionChange] objects that should be applied to the - /// expression, in the order they should be applied. - final List expressionChanges = []; - - /// The list of [AtomicEditInfo] objects corresponding to each change in - /// [expressionChanges]. - final List expressionChangeInfos = []; - - NodeChangeForExpression() : super._(); - - @override - Iterable get _toStringParts => [ - for (var expressionChange in expressionChanges) - expressionChange.describe() - ]; - - void addExpressionChange(ExpressionChange change, AtomicEditInfo? info) { - expressionChanges.add(change); - expressionChangeInfos.add(info); - } - - @override - EditPlan _apply(N node, FixAggregator aggregator) { - var innerPlan = aggregator.innerPlanForNode(node); - return _applyExpression(aggregator, innerPlan); - } - - /// If the expression needs to be wrapped in another expression (e.g. a null - /// check), wraps the given [innerPlan] to produce appropriate result. - /// Otherwise returns [innerPlan] unchanged. - NodeProducingEditPlan _applyExpression( - FixAggregator aggregator, NodeProducingEditPlan innerPlan) { - var plan = innerPlan; - for (int i = 0; i < expressionChanges.length; i++) { - plan = expressionChanges[i] - .applyExpression(aggregator, plan, expressionChangeInfos[i]); - } - return plan; - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [FieldFormalParameter] nodes. -class NodeChangeForFieldFormalParameter - extends NodeChangeForType { - /// If not `null`, an explicit type annotation that should be added to the - /// parameter. - DartType? addExplicitType; - - NodeChangeForFieldFormalParameter() : super._(); - - @override - Iterable get _toStringParts => - [if (addExplicitType != null) 'addExplicitType']; - - @override - EditPlan _apply(FieldFormalParameter node, FixAggregator aggregator) { - if (addExplicitType != null) { - var typeText = aggregator.typeToCode(addExplicitType!); - // Even a field formal parameter can use `var`, `final`. - if (node.keyword?.keyword == Keyword.VAR) { - // TODO(srawlins): Test instrumentation info. - var info = - AtomicEditInfo(NullabilityFixDescription.replaceVar(typeText), {}); - return aggregator.planner.passThrough(node, innerPlans: [ - aggregator.planner - .replaceToken(node, node.keyword!, typeText, info: info), - ...aggregator.innerPlansForNode(node), - ]); - } else { - // TODO(srawlins): Test instrumentation info. - var info = - AtomicEditInfo(NullabilityFixDescription.addType(typeText), {}); - var offset = node.thisKeyword.offset; - return aggregator.planner.passThrough(node, innerPlans: [ - aggregator.planner.insertText(node, offset, [ - AtomicEdit.insert(typeText, info: info), - AtomicEdit.insert(' ') - ]), - ...aggregator.innerPlansForNode(node), - ]); - } - } else { - return super._apply(node, aggregator); - } - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [FunctionTypedFormalParameter] nodes. -class NodeChangeForFunctionTypedFormalParameter - extends NodeChangeForType { - NodeChangeForFunctionTypedFormalParameter() : super._(); -} - -/// Implementation of [NodeChange] specialized for operating on [IfElement] -/// nodes. -class NodeChangeForIfElement extends NodeChange - with NodeChangeForConditional { - NodeChangeForIfElement() : super._(); - - @override - EditPlan _apply(IfElement node, FixAggregator aggregator) { - return _applyConditional(node, aggregator, node.expression, - node.thenElement, node.elseElement) ?? - aggregator.innerPlanForNode(node); - } -} - -/// Implementation of [NodeChange] specialized for operating on [IfStatement] -/// nodes. -class NodeChangeForIfStatement extends NodeChange - with NodeChangeForConditional { - NodeChangeForIfStatement() : super._(); - - @override - EditPlan _apply(IfStatement node, FixAggregator aggregator) { - return _applyConditional(node, aggregator, node.expression, - node.thenStatement, node.elseStatement) ?? - aggregator.innerPlanForNode(node); - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [MethodDeclaration] nodes. -class NodeChangeForMethodDeclaration extends NodeChange { - /// If non-null, indicates a `@nullable` annotation which should be removed - /// from this node. - Annotation? annotationToRemove; - - /// If [annotationToRemove] is non-null, the information that should be - /// contained in the edit. - AtomicEditInfo? removeAnnotationInfo; - - NodeChangeForMethodDeclaration() : super._(); - - @override - Iterable get _toStringParts => - [if (annotationToRemove != null) 'annotationToRemove']; - - @override - EditPlan _apply(MethodDeclaration node, FixAggregator aggregator) { - return aggregator.planner.passThrough(node, innerPlans: [ - if (annotationToRemove != null) - aggregator.planner - .removeNode(annotationToRemove!, info: removeAnnotationInfo), - ...aggregator.innerPlansForNode(node), - ]); - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [MethodInvocation] nodes. -class NodeChangeForMethodInvocation - extends NodeChangeForExpression - with NodeChangeForNullAware { - @override - NodeProducingEditPlan _apply( - MethodInvocation node, FixAggregator aggregator) { - var target = node.target; - var targetPlan = target == null ? null : aggregator.planForNode(target); - var nullAwarePlan = _applyNullAware(node, aggregator); - var methodNamePlan = aggregator.planForNode(node.methodName); - var typeArguments = node.typeArguments; - var typeArgumentsPlan = - typeArguments == null ? null : aggregator.planForNode(typeArguments); - var argumentListPlan = aggregator.planForNode(node.argumentList); - var innerPlans = [ - if (targetPlan != null) targetPlan, - if (nullAwarePlan != null) nullAwarePlan, - methodNamePlan, - if (typeArgumentsPlan != null) typeArgumentsPlan, - argumentListPlan - ]; - return _applyExpression(aggregator, - aggregator.planner.passThrough(node, innerPlans: innerPlans)); - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [SimpleIdentifier] nodes that represent a method name. -class NodeChangeForMethodName extends NodeChange { - /// The name the method name should be changed to, or `null` if no change - /// should be made. - String? _replacement; - - /// Info object associated with the replacement. - AtomicEditInfo? _replacementInfo; - - NodeChangeForMethodName() : super._(); - - /// Queries the name the method name should be changed to, or `null` if no - /// change should be made. - @visibleForTesting - String? get replacement => _replacement; - - /// Queries the info object associated with the replacement. - @visibleForTesting - AtomicEditInfo? get replacementInfo => _replacementInfo; - - @override - Iterable get _toStringParts => - [if (replacement != null) 'replacement: $replacement']; - - /// Updates `this` so that the method name will be changed to [replacement], - /// using [info] to annotate the reason for the change. - void replaceWith(String replacement, AtomicEditInfo? info) { - assert(_replacement == null); - _replacement = replacement; - _replacementInfo = info; - } - - @override - EditPlan _apply(SimpleIdentifier node, FixAggregator aggregator) { - if (replacement != null) { - return aggregator.planner.replace( - node, [AtomicEdit.insert(replacement!, info: replacementInfo)], - info: replacementInfo); - } else { - return aggregator.innerPlanForNode(node); - } - } -} - -/// Common infrastructure used by [NodeChange] objects that operate on AST nodes -/// with that can be null-aware (method invocations and property accesses). -mixin NodeChangeForNullAware on NodeChange { - /// Indicates how null-awareness should be handled. - NullAwarenessRemovalType nullAwarenessRemoval = NullAwarenessRemovalType.none; - - @override - Iterable get _toStringParts => [ - ...super._toStringParts, - if (nullAwarenessRemoval == NullAwarenessRemovalType.strong) - 'removeNullAwareness (strong)' - else if (nullAwarenessRemoval == NullAwarenessRemovalType.weak) - 'removeNullAwareness (weak)' - ]; - - /// Returns an [EditPlan] that removes null awareness, if appropriate. - /// Otherwise returns `null`. - EditPlan? _applyNullAware(N node, FixAggregator aggregator) { - if (nullAwarenessRemoval == NullAwarenessRemovalType.none) return null; - var weak = aggregator._warnOnWeakCode && - nullAwarenessRemoval == NullAwarenessRemovalType.weak; - var description = weak - ? NullabilityFixDescription.nullAwarenessUnnecessaryInStrongMode - : NullabilityFixDescription.removeNullAwareness; - return aggregator.planner.removeNullAwareness(node, - info: AtomicEditInfo(description, const {}), isInformative: weak); - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [PostfixExpression] nodes. -class NodeChangeForPostfixExpression - extends NodeChangeForExpression - with NodeChangeForAssignmentLike { - @override - NodeProducingEditPlan _apply( - PostfixExpression node, FixAggregator aggregator) { - var operandPlan = aggregator.planForNode(node.operand); - var operatorPlan = _makeOperatorPlan(aggregator, node, node.operator); - var innerPlans = [ - operandPlan, - if (operatorPlan != null) operatorPlan - ]; - return _applyExpression(aggregator, - aggregator.planner.passThrough(node, innerPlans: innerPlans)); - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [PrefixExpression] nodes. -class NodeChangeForPrefixExpression - extends NodeChangeForExpression - with NodeChangeForAssignmentLike { - @override - NodeProducingEditPlan _apply( - PrefixExpression node, FixAggregator aggregator) { - var operatorPlan = _makeOperatorPlan(aggregator, node, node.operator); - var operandPlan = aggregator.planForNode(node.operand); - var innerPlans = [ - if (operatorPlan != null) operatorPlan, - operandPlan - ]; - return _applyExpression(aggregator, - aggregator.planner.passThrough(node, innerPlans: innerPlans)); - } -} - -/// Implementation of [NodeChange] specialized for operating on [PropertyAccess] -/// nodes. -class NodeChangeForPropertyAccess - extends NodeChangeForExpression - with NodeChangeForNullAware { - @override - NodeProducingEditPlan _apply(PropertyAccess node, FixAggregator aggregator) { - var targetPlan = - node.target == null ? null : aggregator.planForNode(node.target); - var nullAwarePlan = _applyNullAware(node, aggregator); - var propertyNamePlan = aggregator.planForNode(node.propertyName); - var innerPlans = [ - if (targetPlan != null) targetPlan, - if (nullAwarePlan != null) nullAwarePlan, - propertyNamePlan - ]; - return _applyExpression(aggregator, - aggregator.planner.passThrough(node, innerPlans: innerPlans)); - } -} - -/// Implementation of [NodeChange] specialized for operating on [ShowCombinator] -/// nodes. -class NodeChangeForShowCombinator extends NodeChange { - /// A set of the names that should be added, or the empty set if no names - /// should be added. - final Set _addNames = {}; - - NodeChangeForShowCombinator() : super._(); - - /// Queries the set of names that should be added, or the empty set if no - /// names should be added. - @visibleForTesting - Iterable get addNames => _addNames; - - @override - Iterable get _toStringParts => [ - if (_addNames.isNotEmpty) 'addNames: $_addNames', - ]; - - /// Updates `this` so that [name] will be added. - void addName(String name) { - _addNames.add(name); - } - - @override - EditPlan _apply(ShowCombinator node, FixAggregator aggregator) { - List innerPlans = []; - List namesToAdd = _addNames.toList(); - namesToAdd.sort(); - - void insertName(int offset, String nameToAdd, - {String prefix = '', String suffix = ', '}) { - innerPlans.add(aggregator.planner.insertText(node, offset, [ - if (prefix.isNotEmpty) AtomicEdit.insert(prefix), - AtomicEdit.insert(nameToAdd), - if (suffix.isNotEmpty) AtomicEdit.insert(suffix) - ])); - } - - for (var shownName in node.shownNames) { - while (namesToAdd.isNotEmpty && - namesToAdd.first.compareTo(shownName.name) < 0) { - insertName(shownName.offset, namesToAdd.removeAt(0)); - } - innerPlans.add(aggregator.planForNode(shownName)); - } - while (namesToAdd.isNotEmpty) { - insertName(node.shownNames.last.end, namesToAdd.removeAt(0), - prefix: ', ', suffix: ''); - } - return aggregator.planner.passThrough(node, innerPlans: innerPlans); - } -} - -/// Implementation of [NodeChange] specialized for operating on -/// [SimpleFormalParameter] nodes. -class NodeChangeForSimpleFormalParameter - extends NodeChange { - /// If not `null`, an explicit type annotation that should be added to the - /// parameter. - DartType? addExplicitType; - - NodeChangeForSimpleFormalParameter() : super._(); - - @override - Iterable get _toStringParts => - [if (addExplicitType != null) 'addExplicitType']; - - @override - EditPlan _apply(SimpleFormalParameter node, FixAggregator aggregator) { - var innerPlan = aggregator.innerPlanForNode(node); - if (addExplicitType == null) return innerPlan; - var typeText = aggregator.typeToCode(addExplicitType!); - if (node.keyword?.keyword == Keyword.VAR) { - // TODO(srawlins): Test instrumentation info. - var info = - AtomicEditInfo(NullabilityFixDescription.replaceVar(typeText), {}); - return aggregator.planner.passThrough(node, innerPlans: [ - aggregator.planner - .replaceToken(node, node.keyword!, typeText, info: info), - ...aggregator.innerPlansForNode(node), - ]); - } else { - // TODO(srawlins): Test instrumentation info. - var info = - AtomicEditInfo(NullabilityFixDescription.addType(typeText), {}); - // Skip past the offset of any metadata, a potential `final` keyword, and - // a potential `covariant` keyword. - var offset = node.type?.offset ?? node.name!.offset; - return aggregator.planner.passThrough(node, innerPlans: [ - aggregator.planner.insertText(node, offset, - [AtomicEdit.insert(typeText, info: info), AtomicEdit.insert(' ')]), - ...aggregator.innerPlansForNode(node), - ]); - } - } -} - -/// Implementation of [NodeChange] specialized for operating on nodes which -/// represent a type, and can be made and hinted nullable and non-nullable. -abstract class NodeChangeForType extends NodeChange { - bool _makeNullable = false; - - HintComment? _nullabilityHint; - - /// The decorated type of the type annotation, or `null` if there is no - /// decorated type info of interest. If [makeNullable] is `true`, the node - /// from this type will be attached to the edit that adds the `?`. If - /// [_makeNullable] is `false`, the node from this type will be attached to - /// the information about why the node wasn't made nullable. - DecoratedType? _decoratedType; - - NodeChangeForType._() : super._(); - - @override - bool get isInformative => !_makeNullable; - - /// Indicates whether the type should be made nullable by adding a `?`. - bool get makeNullable => _makeNullable; - - /// If we are making the type nullable due to a hint, the comment that caused - /// it. - HintComment? get nullabilityHint => _nullabilityHint; - - @override - Iterable get _toStringParts => [ - if (_makeNullable) 'makeNullable', - if (_nullabilityHint != null) 'nullabilityHint' - ]; - - void recordNullability(DecoratedType decoratedType, bool makeNullable, - {HintComment? nullabilityHint}) { - _decoratedType = decoratedType; - _makeNullable = makeNullable; - _nullabilityHint = nullabilityHint; - } - - @override - EditPlan _apply(N node, FixAggregator aggregator) { - var innerPlan = aggregator.innerPlanForNode(node); - if (_decoratedType == null) return innerPlan; - var typeName = - _decoratedType!.type!.getDisplayString(withNullability: false); - var fixReasons = {FixReasonTarget.root: _decoratedType!.node}; - if (_makeNullable) { - var hint = _nullabilityHint; - if (hint != null) { - return aggregator.planner.acceptSuffixHint(innerPlan, hint, - info: AtomicEditInfo( - NullabilityFixDescription.makeTypeNullableDueToHint(typeName), - fixReasons, - hintComment: hint)); - } else { - return aggregator.planner.makeNullable(innerPlan, - info: AtomicEditInfo( - NullabilityFixDescription.makeTypeNullable(typeName), - fixReasons)); - } - } else { - var hint = _nullabilityHint; - if (hint != null) { - return aggregator.planner.dropNullabilityHint(innerPlan, hint, - info: AtomicEditInfo( - NullabilityFixDescription.typeNotMadeNullableDueToHint( - typeName), - fixReasons, - hintComment: hint)); - } else { - return aggregator.planner.explainNonNullable(innerPlan, - info: AtomicEditInfo( - NullabilityFixDescription.typeNotMadeNullable(typeName), - fixReasons)); - } - } - } -} - -/// Implementation of [NodeChange] specialized for operating on [TypeAnnotation] -/// nodes. -class NodeChangeForTypeAnnotation extends NodeChangeForType { - NodeChangeForTypeAnnotation() : super._(); -} - -/// Implementation of [NodeChange] specialized for operating on -/// [VariableDeclarationList] nodes. -class NodeChangeForVariableDeclarationList - extends NodeChange { - /// If an explicit type should be added to this variable declaration, the type - /// that should be added. Otherwise `null`. - DartType? addExplicitType; - - /// Indicates whether a "late" annotation should be added to this variable - /// declaration, caused by inference. - LateAdditionReason? lateAdditionReason; - - /// If a "late" annotation should be added to this variable declaration, and - /// the cause is a "late" hint, the hint that caused it. Otherwise `null`. - HintComment? lateHint; - - NodeChangeForVariableDeclarationList() : super._(); - - @override - Iterable get _toStringParts => [ - if (addExplicitType != null) 'addExplicitType', - if (lateAdditionReason != null) 'lateAdditionReason', - if (lateHint != null) 'lateHint' - ]; - - @override - EditPlan _apply(VariableDeclarationList node, FixAggregator aggregator) { - List innerPlans = []; - if (lateAdditionReason != null) { - var description = lateAdditionReason == LateAdditionReason.inference - ? NullabilityFixDescription.addLate - : NullabilityFixDescription.addLateDueToTestSetup; - var info = AtomicEditInfo(description, {}); - innerPlans.add(aggregator.planner.insertText( - node, - node.firstTokenAfterCommentAndMetadata.offset, - [AtomicEdit.insert('late', info: info), AtomicEdit.insert(' ')])); - } - if (addExplicitType != null) { - var typeText = aggregator.typeToCode(addExplicitType!); - if (node.keyword?.keyword == Keyword.VAR) { - var info = - AtomicEditInfo(NullabilityFixDescription.replaceVar(typeText), {}); - innerPlans.add(aggregator.planner - .replaceToken(node, node.keyword!, typeText, info: info)); - } else { - var info = - AtomicEditInfo(NullabilityFixDescription.addType(typeText), {}); - innerPlans.add(aggregator.planner.insertText( - node, - node.variables.first.offset, - [AtomicEdit.insert(typeText, info: info), AtomicEdit.insert(' ')])); - } - } - innerPlans.addAll(aggregator.innerPlansForNode(node)); - var plan = aggregator.planner.passThrough(node, innerPlans: innerPlans); - if (lateHint != null) { - var description = lateHint!.kind == HintCommentKind.late_ - ? NullabilityFixDescription.addLateDueToHint - : NullabilityFixDescription.addLateFinalDueToHint; - plan = aggregator.planner.acceptPrefixHint(plan, lateHint!, - info: AtomicEditInfo(description, {}, hintComment: lateHint)); - } - return plan; - } -} - -/// [ExpressionChange] describing the addition of a comment explaining that a -/// literal `null` could not be migrated. -class NoValidMigrationChange extends ExpressionChange { - NoValidMigrationChange(super.resultType); - - @override - NullabilityFixDescription get description => - NullabilityFixDescription.noValidMigrationForNull; - - @override - NodeProducingEditPlan applyExpression(FixAggregator aggregator, - NodeProducingEditPlan innerPlan, AtomicEditInfo? info) => - aggregator.planner.addCommentPostfix( - innerPlan, '/* no valid migration */', - info: info, isInformative: true); - - @override - String applyText(FixAggregator aggregator, String inner) => - '$inner /* no valid migration */'; - - @override - String describe() => 'NoValidMigrationChange'; -} - -/// Enum used by [NodeChangeForNullAware] to indicate how null awareness should -/// be handled. -enum NullAwarenessRemovalType { - /// Do not remove null awareness. - none, - - /// If warning on weak code, issue a warning; otherwise remove null awareness. - weak, - - /// Remove null awareness unconditionally. - strong, -} - -/// [ExpressionChange] describing the addition of an `!` after an expression. -class NullCheckChange extends ExpressionChange { - /// The hint that is causing this `!` to be added, if any. - final HintComment? hint; - - NullCheckChange(super.resultType, {this.hint}); - - @override - NullabilityFixDescription get description => - NullabilityFixDescription.checkExpression; - - @override - NodeProducingEditPlan applyExpression(FixAggregator aggregator, - NodeProducingEditPlan innerPlan, AtomicEditInfo? info) { - if (hint != null) { - return aggregator.planner.acceptSuffixHint(innerPlan, hint!, info: info); - } else { - return aggregator.planner - .addUnaryPostfix(innerPlan, TokenType.BANG, info: info); - } - } - - @override - String applyText(FixAggregator aggregator, String inner) => '$inner!'; - - @override - String describe() => 'NullCheckChange'; -} - -/// Visitor that creates an appropriate [NodeChange] object for the node being -/// visited. -class _NodeChangeVisitor extends GeneralizingAstVisitor> { - static final _instance = _NodeChangeVisitor(); - - @override - NodeChange visitAnnotation(Annotation node) => NodeChangeForAnnotation(); - - @override - NodeChange visitArgumentList(ArgumentList node) => - NodeChangeForArgumentList(); - - @override - NodeChange visitAsExpression(AsExpression node) => - NodeChangeForAsExpression(); - - @override - NodeChange visitAssignmentExpression(AssignmentExpression node) => - NodeChangeForAssignment(); - - @override - NodeChange visitCompilationUnit(CompilationUnit node) => - NodeChangeForCompilationUnit(); - - @override - NodeChange visitConditionalExpression(ConditionalExpression node) => - NodeChangeForConditionalExpression(); - - @override - NodeChange visitDefaultFormalParameter(DefaultFormalParameter node) => - NodeChangeForDefaultFormalParameter(); - - @override - NodeChange visitExpression(Expression node) => NodeChangeForExpression(); - - @override - NodeChange visitFieldFormalParameter(FieldFormalParameter node) => - NodeChangeForFieldFormalParameter(); - - @override - NodeChange visitFunctionTypedFormalParameter( - FunctionTypedFormalParameter node) => - NodeChangeForFunctionTypedFormalParameter(); - - @override - NodeChange visitGenericFunctionType(GenericFunctionType node) => - NodeChangeForTypeAnnotation(); - - @override - NodeChange visitIfElement(IfElement node) => NodeChangeForIfElement(); - - @override - NodeChange visitIfStatement(IfStatement node) => NodeChangeForIfStatement(); - - @override - NodeChange visitMethodDeclaration(MethodDeclaration node) => - NodeChangeForMethodDeclaration(); - - @override - NodeChange visitMethodInvocation(MethodInvocation node) => - NodeChangeForMethodInvocation(); - - @override - NodeChange visitNamedType(NamedType node) => NodeChangeForTypeAnnotation(); - - @override - NodeChange visitNode(AstNode node) => - throw StateError('Unexpected node type: ${node.runtimeType}'); - - @override - NodeChange visitPostfixExpression(PostfixExpression node) => - NodeChangeForPostfixExpression(); - - @override - NodeChange visitPrefixExpression(PrefixExpression node) => - NodeChangeForPrefixExpression(); - - @override - NodeChange visitPropertyAccess(PropertyAccess node) => - NodeChangeForPropertyAccess(); - - @override - NodeChange visitShowCombinator(ShowCombinator node) => - NodeChangeForShowCombinator(); - - @override - NodeChange visitSimpleFormalParameter(SimpleFormalParameter node) => - NodeChangeForSimpleFormalParameter(); - - @override - NodeChange? visitSimpleIdentifier(SimpleIdentifier node) { - var parent = node.parent; - if (parent is MethodInvocation && identical(node, parent.methodName)) { - return NodeChangeForMethodName(); - } else { - return super.visitSimpleIdentifier(node); - } - } - - @override - NodeChange visitVariableDeclarationList(VariableDeclarationList node) => - NodeChangeForVariableDeclarationList(); -} diff --git a/pkg/nnbd_migration/lib/src/fix_builder.dart b/pkg/nnbd_migration/lib/src/fix_builder.dart deleted file mode 100644 index 472ad73055d1..000000000000 --- a/pkg/nnbd_migration/lib/src/fix_builder.dart +++ /dev/null @@ -1,1500 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:_fe_analyzer_shared/src/flow_analysis/flow_analysis.dart'; -import 'package:analyzer/dart/analysis/features.dart'; -import 'package:analyzer/dart/ast/token.dart'; -import 'package:analyzer/dart/ast/visitor.dart'; -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/dart/element/nullability_suffix.dart'; -import 'package:analyzer/dart/element/type.dart'; -import 'package:analyzer/dart/element/type_provider.dart'; -import 'package:analyzer/error/listener.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:analyzer/src/dart/ast/ast.dart'; -import 'package:analyzer/src/dart/element/element.dart'; -import 'package:analyzer/src/dart/element/inheritance_manager3.dart'; -import 'package:analyzer/src/dart/element/member.dart'; -import 'package:analyzer/src/dart/element/type.dart'; -import 'package:analyzer/src/dart/element/type_provider.dart'; -import 'package:analyzer/src/dart/element/type_system.dart'; -import 'package:analyzer/src/error/best_practices_verifier.dart'; -import 'package:analyzer/src/generated/element_type_provider.dart'; -import 'package:analyzer/src/generated/migration.dart'; -import 'package:analyzer/src/generated/resolver.dart'; -import 'package:analyzer/src/generated/utilities_dart.dart'; -import 'package:collection/collection.dart' show IterableExtension; -import 'package:meta/meta.dart'; -import 'package:nnbd_migration/fix_reason_target.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; -import 'package:nnbd_migration/src/decorated_class_hierarchy.dart'; -import 'package:nnbd_migration/src/decorated_type.dart'; -import 'package:nnbd_migration/src/edit_plan.dart'; -import 'package:nnbd_migration/src/fix_aggregator.dart'; -import 'package:nnbd_migration/src/nullability_node.dart'; -import 'package:nnbd_migration/src/utilities/built_value_transformer.dart'; -import 'package:nnbd_migration/src/utilities/permissive_mode.dart'; -import 'package:nnbd_migration/src/utilities/resolution_utils.dart'; -import 'package:nnbd_migration/src/utilities/where_not_null_transformer.dart'; -import 'package:nnbd_migration/src/utilities/where_or_null_transformer.dart'; -import 'package:nnbd_migration/src/variables.dart'; -import 'package:pub_semver/pub_semver.dart'; - -bool _isIncrementOrDecrementOperator(TokenType tokenType) { - switch (tokenType) { - case TokenType.PLUS_PLUS: - case TokenType.MINUS_MINUS: - return true; - default: - return false; - } -} - -/// Problem reported by [FixBuilder] when encountering a compound assignment -/// for which the combination result is nullable. This occurs if the compound -/// assignment resolves to a user-defined operator that returns a nullable type, -/// but the target of the assignment expects a non-nullable type. We need to -/// add a null check but it's nontrivial to do so because we would have to -/// rewrite the assignment as an ordinary assignment (e.g. change `x += y` to -/// `x = (x + y)!`), but that might change semantics by causing subexpressions -/// of the target to be evaluated twice. -/// -/// TODO(paulberry): consider alternatives. -/// See https://github.com/dart-lang/sdk/issues/38675. -class CompoundAssignmentCombinedNullable implements Problem { - const CompoundAssignmentCombinedNullable(); -} - -/// Problem reported by [FixBuilder] when encountering a compound assignment -/// for which the value read from the target of the assignment has a nullable -/// type. We need to add a null check but it's nontrivial to do so because we -/// would have to rewrite the assignment as an ordinary assignment (e.g. change -/// `x += y` to `x = x! + y`), but that might change semantics by causing -/// subexpressions of the target to be evaluated twice. -/// -/// TODO(paulberry): consider alternatives. -/// See https://github.com/dart-lang/sdk/issues/38676. -class CompoundAssignmentReadNullable implements Problem { - const CompoundAssignmentReadNullable(); -} - -/// This class runs the analyzer's resolver over the code being migrated, after -/// graph propagation, to figure out what changes need to be made. It doesn't -/// actually make the changes; it simply reports what changes are necessary -/// through abstract methods. -class FixBuilder { - final DecoratedClassHierarchy? _decoratedClassHierarchy; - - /// The type provider providing non-nullable types. - final TypeProvider typeProvider; - - final Map changes = {}; - - final Map> problems = {}; - - /// The NNBD type system. - final TypeSystemImpl _typeSystem; - - /// Variables for this migration run. - final Variables? _variables; - - /// The file being analyzed. - final Source? source; - - late ResolverVisitor _resolver; - - /// The listener to which exceptions should be reported. - final NullabilityMigrationListener? listener; - - /// The compilation unit for which fixes are being built. - final CompilationUnit? unit; - - final MigrationResolutionHooksImpl migrationResolutionHooks; - - /// Parameter elements for which an explicit type should be added, and what - /// that type should be. - final Map _addedParameterTypes = {}; - - final bool? warnOnWeakCode; - - final NullabilityGraph _graph; - - /// Helper that assists us in transforming Iterable methods to their "OrNull" - /// equivalents. - final WhereOrNullTransformer _whereOrNullTransformer; - - /// Helper that assists us in transforming calls to `Iterable.where` to - /// `Iterable.whereNotNull`. - final WhereNotNullTransformer _whereNotNullTransformer; - - /// The set of extensions that need to be imported from package:collection. - @visibleForTesting - final Set neededCollectionPackageExtensions = {}; - - /// Map of additional package dependencies that will be required by the - /// migrated code. Keys are package names; values indicate the minimum - /// required version of each package. - final Map _neededPackages; - - factory FixBuilder( - Source? source, - DecoratedClassHierarchy? decoratedClassHierarchy, - TypeProvider typeProvider, - TypeSystemImpl typeSystem, - Variables? variables, - LibraryElementImpl definingLibrary, - NullabilityMigrationListener? listener, - CompilationUnit? unit, - bool? warnOnWeakCode, - NullabilityGraph graph, - Map neededPackages) { - var migrationResolutionHooks = MigrationResolutionHooksImpl(); - return FixBuilder._( - decoratedClassHierarchy, - _makeNnbdTypeSystem( - (typeProvider as TypeProviderImpl).asNonNullableByDefault, - typeSystem, - migrationResolutionHooks), - variables, - source, - definingLibrary, - listener, - unit, - migrationResolutionHooks, - warnOnWeakCode, - graph, - neededPackages); - } - - FixBuilder._( - this._decoratedClassHierarchy, - this._typeSystem, - this._variables, - this.source, - LibraryElementImpl definingLibrary, - this.listener, - this.unit, - this.migrationResolutionHooks, - this.warnOnWeakCode, - this._graph, - this._neededPackages) - : typeProvider = _typeSystem.typeProvider, - _whereOrNullTransformer = - WhereOrNullTransformer(_typeSystem.typeProvider, _typeSystem), - _whereNotNullTransformer = - WhereNotNullTransformer(_typeSystem.typeProvider, _typeSystem) { - migrationResolutionHooks._fixBuilder = this; - assert(_typeSystem.isNonNullableByDefault); - assert((typeProvider as TypeProviderImpl).isNonNullableByDefault); - var inheritanceManager = InheritanceManager3(); - // TODO(paulberry): is it a bad idea to throw away errors? - var errorListener = AnalysisErrorListener.NULL_LISTENER; - _resolver = ResolverVisitorForMigration( - inheritanceManager, - definingLibrary, - source!, - typeProvider, - errorListener, - _typeSystem, - FeatureSet.fromEnableFlags2( - sdkLanguageVersion: Feature.non_nullable.releaseVersion!, - flags: [], - ), - migrationResolutionHooks); - } - - /// Visits the entire compilation [unit] using the analyzer's resolver and - /// makes note of changes that need to be made. - void visitAll() { - try { - ElementTypeProvider.current = migrationResolutionHooks; - unit!.accept(_FixBuilderPreVisitor(this)); - unit!.accept(_resolver); - unit!.accept(_FixBuilderPostVisitor(this)); - } catch (exception, stackTrace) { - if (listener != null) { - listener!.reportException(source, unit, exception, stackTrace); - } else { - rethrow; - } - } finally { - ElementTypeProvider.current = const ElementTypeProvider(); - } - } - - /// Called whenever an AST node is found that can't be automatically fixed. - void _addProblem(AstNode node, Problem problem) { - var newlyAdded = (problems[node] ??= {}).add(problem); - assert(newlyAdded); - } - - /// Computes the type that [element] will have after migration. - /// - /// If [targetType] is present, and [element] is a class member, it is the - /// type of the class within which [element] is being accessed; this is used - /// to perform the correct substitutions. - DartType _computeMigratedType(Element element) { - element = element.declaration!; - if (element is ClassElement || element is TypeParameterElement) { - return typeProvider.typeType; - } else if (element is PropertyAccessorElement && - element.isSynthetic && - !element.variable.isSynthetic) { - var variableType = _variables! - .toFinalType(_variables!.decoratedElementType(element.variable)); - if (element.isSetter) { - return FunctionTypeImpl( - returnType: typeProvider.voidType, - typeFormals: [], - parameters: [ - ParameterElementImpl.synthetic( - 'value', variableType, ParameterKind.REQUIRED) - ], - nullabilitySuffix: NullabilitySuffix.none); - } else { - return FunctionTypeImpl( - returnType: variableType, - typeFormals: [], - parameters: [], - nullabilitySuffix: NullabilitySuffix.none); - } - } else { - return _variables!.toFinalType(_variables!.decoratedElementType(element)); - } - } - - /// If [node] is a property access or method invocation, returns the element - /// it invokes. Otherwise returns `null`. - Element? _findPropertyOrMethodElement(Expression node) { - if (node is PrefixedIdentifier) { - return node.identifier.staticElement; - } else if (node is PropertyAccess) { - return node.propertyName.staticElement; - } else if (node is MethodInvocation) { - return node.methodName.staticElement; - } else { - return null; - } - } - - /// Returns the [NodeChange] object accumulating changes for the given [node], - /// creating it if necessary. - NodeChange _getChange(AstNode node) => - changes[node] ??= NodeChange.create(node)!; - - /// Determines whether the given [node], which is a null-aware method - /// invocation, property access, or index expression, should remain null-aware - /// after migration. - bool _shouldStayNullAware(Expression node) { - Expression? target; - if (node is PropertyAccess) { - target = node.target; - } else if (node is MethodInvocation) { - target = node.target; - } else { - throw StateError('Unexpected expression type: ${node.runtimeType}'); - } - if (!_typeSystem.isPotentiallyNullable(target!.staticType!)) { - var element = _findPropertyOrMethodElement(target); - if (element != null) { - var library = element.library; - if (library!.isNonNullableByDefault && - !_graph.isBeingMigrated(library.source)) { - (_getChange(node) as NodeChangeForNullAware).nullAwarenessRemoval = - NullAwarenessRemovalType.strong; - return false; - } - } - (_getChange(node) as NodeChangeForNullAware).nullAwarenessRemoval = - NullAwarenessRemovalType.weak; - return false; - } - return true; - } - - static TypeSystemImpl _makeNnbdTypeSystem( - TypeProvider nnbdTypeProvider, - TypeSystemImpl typeSystem, - MigrationResolutionHooksImpl migrationResolutionHooks) { - // TODO(paulberry): do we need to test both possible values of - // strictInference? - return TypeSystemImpl( - isNonNullableByDefault: true, - strictCasts: typeSystem.strictCasts, - strictInference: typeSystem.strictInference, - typeProvider: nnbdTypeProvider); - } -} - -/// Fix reason object when adding a null check because of an explicit hint. -class FixReason_NullCheckHint implements SimpleFixReasonInfo { - @override - final CodeReference codeReference; - - FixReason_NullCheckHint(this.codeReference); - - @override - String get description => 'Null check hint'; -} - -/// Implementation of [MigrationResolutionHooks] that interfaces with -/// [FixBuilder]. -class MigrationResolutionHooksImpl - with ResolutionUtils - implements MigrationResolutionHooks { - late final FixBuilder _fixBuilder; - - final Expando> _collectionElements = Expando(); - - final Expando _shouldStayNullAware = Expando(); - - final Map - _assignmentLikeExpressionHandlers = {}; - - FlowAnalysis? - _flowAnalysis; - - /// Deferred processing that should be performed once we have finished - /// evaluating the type of an expression. - final Map - _deferredExpressionProcessing = {}; - - final Map _contextTypes = {}; - - TypeProvider get typeProvider => _fixBuilder.typeProvider; - - @override - void freshTypeParameterCreated(TypeParameterElement newTypeParameter, - TypeParameterElement oldTypeParameter) { - DecoratedTypeParameterBounds.current!.put(newTypeParameter, - DecoratedTypeParameterBounds.current!.get(oldTypeParameter)); - } - - @override - List getClassInterfaces(InterfaceElementImpl element) { - return _wrapExceptions( - _fixBuilder.unit, - () => element.interfacesInternal, - () => [ - for (var interface in element.interfacesInternal) - _getClassInterface(element, interface.element) - ]); - } - - @override - bool? getConditionalKnownValue(AstNode node) => - _wrapExceptions(node, () => null, () { - // TODO(paulberry): handle conditional expressions. - var conditionalDiscard = _fixBuilder._variables! - .getConditionalDiscard(_fixBuilder.source, node); - if (conditionalDiscard == null) { - return null; - } else { - if (conditionalDiscard.keepTrue && conditionalDiscard.keepFalse) { - return null; - } - var conditionValue = conditionalDiscard.keepTrue; - (_fixBuilder._getChange(node) as NodeChangeForConditional) - ..conditionValue = conditionValue - ..conditionReason = conditionalDiscard.reason; - // If we're just issuing warnings, instruct the resolver to go ahead - // and visit both branches of the conditional. - return _fixBuilder.warnOnWeakCode! ? null : conditionValue; - } - }); - - @override - List getExecutableParameters( - ExecutableElementImpl element) { - // Note: even if the element is part of a library that's being migrated, - // there's no guarantee that the parameter elements have been appropriately - // updated by the migration process, because they might be synthetic - // parameters. (This happens when the code being migrated contains a mixin - // application and there's a synthetic constructor). So we can't safely get - // the parameters out of the element. But it is always safe to defer to - // `getExecutableType` and get the parameter list from the function type. - return getExecutableType(element).parameters; - } - - @override - DartType getExecutableReturnType(Element element) => - getExecutableType(element as ElementImplWithFunctionType).returnType; - - @override - FunctionType getExecutableType(ElementImplWithFunctionType element) => - _wrapExceptions(_fixBuilder.unit, () => element.typeInternal, () { - var type = _fixBuilder._computeMigratedType(element); - Element baseElement = element; - if (baseElement is Member) { - type = baseElement.substitution.substituteType(type); - } - return type as FunctionType; - }); - - @override - DartType getExtendedType(ExtensionElementImpl element) { - return _wrapExceptions( - _fixBuilder.unit, - () => element.extendedTypeInternal, - () => _fixBuilder._variables!.toFinalType( - _fixBuilder._variables!.decoratedElementType(element))); - } - - @override - DartType getFieldType(PropertyInducingElementImpl element) => - _wrapExceptions(_fixBuilder.unit, () => element.typeInternal, () { - assert(!element.isSynthetic); - return _fixBuilder._computeMigratedType(element); - }); - - @override - List getListElements(ListLiteral node) => _wrapExceptions( - node, - () => node.elements, - () => _collectionElements[node] ??= - _transformCollectionElements(node.elements)); - - @override - List getSetOrMapElements(SetOrMapLiteral node) => - _wrapExceptions( - node, - () => node.elements, - () => _collectionElements[node] ??= - _transformCollectionElements(node.elements)); - - @override - DartType? getTypeParameterBound(TypeParameterElementImpl element) { - var decoratedBound = _fixBuilder._variables! - .decoratedTypeParameterBound(element, allowNullUnparentedBounds: true); - if (decoratedBound == null) return element.boundInternal; - var bound = _fixBuilder._variables!.toFinalType(decoratedBound); - if (bound is DynamicType) { - return null; - } else if (bound.isDartCoreObject && - bound.nullabilitySuffix == NullabilitySuffix.question) { - return null; - } else { - return bound; - } - } - - @override - DartType getVariableType(VariableElementImpl variable) => - _wrapExceptions(_fixBuilder.unit, () => variable.typeInternal, () { - if (variable.library == null) { - // This is a synthetic variable created during resolution (e.g. a - // parameter of a function type), so the type it currently has is the - // correct post-migration type. - return variable.typeInternal; - } - if (variable is ParameterElement) { - var enclosingElement = variable.enclosingElement; - if (enclosingElement is PropertyAccessorElement && - enclosingElement.isSynthetic) { - // This is the parameter of a synthetic getter, so it has the same - // type as the corresponding variable. - return _fixBuilder._computeMigratedType(enclosingElement.variable); - } - } - return _fixBuilder._computeMigratedType(variable); - }); - - @override - bool isIndexExpressionNullAware(IndexExpression node) { - // Null-aware index expressions weren't supported prior to NNBD. - assert(!node.isNullAware); - return false; - } - - @override - bool isLibraryNonNullableByDefault(LibraryElementImpl element) { - return _fixBuilder._graph.isBeingMigrated(element.source) || - element.isNonNullableByDefaultInternal; - } - - @override - bool isMethodInvocationNullAware(MethodInvocation node) { - return node.isNullAware && - (_shouldStayNullAware[node] ??= _fixBuilder._shouldStayNullAware(node)); - } - - /// Indicates whether the given [element] is a member of an extension on a - /// potentially nullable type (and hence the extension member can be invoked - /// on a nullable type without introducing a null check). - bool isNullableExtensionMember(Element? element) { - if (element != null) { - var enclosingElement = element.enclosingElement; - if (enclosingElement is ExtensionElement) { - return _fixBuilder._typeSystem - .isPotentiallyNullable(enclosingElement.extendedType); - } - } - return false; - } - - @override - bool isPropertyAccessNullAware(PropertyAccess node) { - return node.isNullAware && - (_shouldStayNullAware[node] ??= _fixBuilder._shouldStayNullAware(node)); - } - - @override - DartType modifyExpressionType( - Expression node, DartType type, DartType? contextType) => - _wrapExceptions(node, () => type, () { - _contextTypes[node] = contextType; - if (node is NamedExpression) { - // Do not attempt to modify named expressions. We should already have - // been called for [node.expression], and we should have made the - // necessary modifications then. - return type; - } - var parent = node.parent; - if (parent is AssignmentExpression) { - if (parent.leftHandSide == node) { - return type; - } - return _assignmentLikeExpressionHandlers[parent]! - .modifyAssignmentRhs(this, node, type); - } else if (parent is PrefixExpression) { - if (_isIncrementOrDecrementOperator(parent.operator.type)) { - return type; - } - } else if (parent is PostfixExpression) { - if (_isIncrementOrDecrementOperator(parent.operator.type)) { - return type; - } - } - return _modifyRValueType(node, type); - }); - - @override - DartType modifyInferredParameterType( - ParameterElement parameter, DartType type) { - var postMigrationType = parameter.type; - if (postMigrationType != type) { - // TODO(paulberry): test field formal parameters. - _fixBuilder._addedParameterTypes[parameter] = postMigrationType; - return postMigrationType; - } - return type; - } - - @override - void reportBinaryExpressionContext( - BinaryExpression node, DartType? contextType) { - _contextTypes[node] = contextType; - } - - @override - void setCompoundAssignmentExpressionTypes(CompoundAssignmentExpression node) { - assert(_assignmentLikeExpressionHandlers[node] == null); - if (node is AssignmentExpression) { - var handler = _AssignmentExpressionHandler(node); - _assignmentLikeExpressionHandlers[node] = handler; - handler.handleLValueType(this, node.readType, node.writeType!); - } else if (node is PrefixExpression) { - assert(_isIncrementOrDecrementOperator(node.operator.type)); - var handler = _PrefixExpressionHandler(node); - _assignmentLikeExpressionHandlers[node] = handler; - handler.handleLValueType(this, node.readType, node.writeType!); - handler.handleAssignmentRhs(this, _fixBuilder.typeProvider.intType); - } else if (node is PostfixExpression) { - assert(_isIncrementOrDecrementOperator(node.operator.type)); - var handler = _PostfixExpressionHandler(node); - _assignmentLikeExpressionHandlers[node] = handler; - handler.handleLValueType(this, node.readType, node.writeType!); - handler.handleAssignmentRhs(this, _fixBuilder.typeProvider.intType); - } else { - throw StateError('(${node.runtimeType}) $node'); - } - } - - @override - void setFlowAnalysis( - FlowAnalysis? - flowAnalysis) { - _flowAnalysis = flowAnalysis; - } - - DartType _addCastOrNullCheck( - Expression node, DartType expressionType, DartType contextType) { - var expressionFutureTypeArgument = _getFutureTypeArgument(expressionType); - var contextFutureOrTypeArgument = _getFutureOrTypeArgument(contextType); - var parent = node.parent; - if (parent is AwaitExpression && - expressionFutureTypeArgument != null && - contextFutureOrTypeArgument != null) { - // `node` is an expression inside an await expression, and is a Future of - // a nullable type. The context type is a FutureOr... - var nonNullType = _fixBuilder._typeSystem - .promoteToNonNull(expressionFutureTypeArgument); - if (_fixBuilder._typeSystem.isSubtypeOf(nonNullType, contextType)) { - // ... and a null-check will get us where we need to be; add a - // null-check to the outer await, instead of adding a cast to FutureOr - // inside the await. - var change = _createExpressionChange( - parent, expressionFutureTypeArgument, contextType); - var checks = _fixBuilder._variables! - .expressionChecks(_fixBuilder.source, parent); - var info = AtomicEditInfo(change.description, checks?.edges ?? {}); - (_fixBuilder._getChange(parent) as NodeChangeForExpression) - .addExpressionChange(change, info); - _deferredExpressionProcessing[parent] = (_) => change.resultType; - return expressionType; - } - } - - var checks = - _fixBuilder._variables!.expressionChecks(_fixBuilder.source, node); - var change = _createExpressionChange(node, expressionType, contextType); - var info = AtomicEditInfo(change.description, checks?.edges ?? {}); - (_fixBuilder._getChange(node) as NodeChangeForExpression) - .addExpressionChange(change, info); - return change.resultType; - } - - /// Ensures that the migrated file will contain an import of the extension - /// called [extensionName] from `package:collection/collection.dart`, and that - /// the pubspec will be appropriately updated (if necessary). - void _addCollectionPackageExtension(String extensionName) { - _fixBuilder.neededCollectionPackageExtensions.add(extensionName); - _fixBuilder._neededPackages['collection'] = - Version.parse('1.15.0-nullsafety.4'); - } - - DartType _addNullCheck(Expression node, DartType type, - {AtomicEditInfo? info, HintComment? hint}) { - var change = _createNullCheckChange(node, type, hint: hint); - var checks = - _fixBuilder._variables!.expressionChecks(_fixBuilder.source, node); - info ??= AtomicEditInfo(change.description, checks?.edges ?? {}); - var nodeChangeForExpression = - _fixBuilder._getChange(node) as NodeChangeForExpression; - nodeChangeForExpression.addExpressionChange(change, info); - return change.resultType; - } - - bool _canBeInvokedOnNullable(Identifier identifier) => - isDeclaredOnObject(identifier.name) || - isNullableExtensionMember(identifier.staticElement); - - ExpressionChange _createExpressionChange( - Expression node, DartType expressionType, DartType contextType) { - var expressionFutureTypeArgument = _getFutureTypeArgument(expressionType); - var contextFutureTypeArgument = _getFutureTypeArgument(contextType); - if (expressionFutureTypeArgument != null && - contextFutureTypeArgument != null) { - return IntroduceThenChange( - contextType, - _createExpressionChange( - node, expressionFutureTypeArgument, contextFutureTypeArgument)); - } - // Either a cast or a null check is needed. We prefer to do a null - // check if we can. - var nonNullType = _fixBuilder._typeSystem.promoteToNonNull(expressionType); - if (_fixBuilder._typeSystem.isSubtypeOf(nonNullType, contextType)) { - return _createNullCheckChange(node, expressionType); - } else { - _flowAnalysis!.asExpression_end(node, contextType); - var glb = _fixBuilder._typeSystem - .greatestLowerBound(contextType, expressionType); - - if (glb != _fixBuilder._typeSystem.typeProvider.neverType && - !identical(glb, expressionType)) { - return IntroduceAsChange(glb, isDowncast: true); - } - // there is no sense to do casts of unrelated types, let it fail at - // compile time, so users see it earlier. - return NoValidMigrationChange(contextType); - } - } - - ExpressionChange _createNullCheckChange(Expression node, DartType type, - {HintComment? hint}) { - var resultType = _fixBuilder._typeSystem.promoteToNonNull(type as TypeImpl); - _flowAnalysis!.nonNullAssert_end(node); - return type.isDartCoreNull && hint == null - ? NoValidMigrationChange(resultType) - : NullCheckChange(resultType, hint: hint); - } - - Expression _findNullabilityContextAncestor(Expression node) { - while (true) { - var parent = node.parent; - if (parent is BinaryExpression && - parent.operator.type == TokenType.QUESTION_QUESTION && - identical(node, parent.rightOperand)) { - node = parent; - continue; - } - return node; - } - } - - InterfaceType _getClassInterface( - InterfaceElement class_, InterfaceElement superclass) { - var decoratedSupertype = _fixBuilder._decoratedClassHierarchy! - .getDecoratedSupertype(class_, superclass); - var finalType = _fixBuilder._variables!.toFinalType(decoratedSupertype); - return finalType as InterfaceType; - } - - DartType? _getFutureOrTypeArgument(DartType type) { - if (type is InterfaceType && type.isDartAsyncFutureOr) { - var typeArguments = type.typeArguments; - if (typeArguments.isNotEmpty) { - return typeArguments.first; - } - } - return null; - } - - DartType? _getFutureTypeArgument(DartType type) { - if (type is InterfaceType && type.isDartAsyncFuture) { - var typeArguments = type.typeArguments; - if (typeArguments.isNotEmpty) { - return typeArguments.first; - } - } - return null; - } - - bool _isSubtypeOrCoercible(DartType type, DartType context) { - var typeSystem = _fixBuilder._typeSystem; - if (typeSystem.isSubtypeOf(type, context)) { - return true; - } - if (context is FunctionType && type is InterfaceType) { - var callMethod = type.lookUpMethod2( - 'call', _fixBuilder.unit!.declaredElement!.library); - if (callMethod != null) { - var variables = _fixBuilder._variables!; - var callMethodType = variables.toFinalType( - variables.decoratedElementType(callMethod.declaration)); - if (callMethod is MethodMember) { - callMethodType = - callMethod.substitution.substituteType(callMethodType); - } - if (typeSystem.isSubtypeOf(callMethodType, context)) { - return true; - } - } - } - return false; - } - - DartType _modifyRValueType(Expression node, DartType type, - {DartType? context}) { - var deferredProcessing = _deferredExpressionProcessing.remove(node); - if (deferredProcessing != null) { - type = deferredProcessing(type); - } - var hint = - _fixBuilder._variables!.getNullCheckHint(_fixBuilder.source, node); - if (hint != null) { - type = _addNullCheck(node, type, - info: AtomicEditInfo( - NullabilityFixDescription.checkExpressionDueToHint, - { - FixReasonTarget.root: - FixReason_NullCheckHint(CodeReference.fromAstNode(node)) - }, - hintComment: hint), - hint: hint); - } - if (type is DynamicType) return type; - var ancestor = _findNullabilityContextAncestor(node); - context ??= _contextTypes[ancestor] ?? DynamicTypeImpl.instance; - if (!_isSubtypeOrCoercible(type, context)) { - return _tryTransformOrElse(node, type) ?? - _tryTransformWhere(node, type) ?? - _addCastOrNullCheck(node, type, context); - } else { - // Even if the type is a subtype of its context, we still want to - // transform `.where`. - type = _tryTransformWhere(node, type) ?? type; - } - if (!_fixBuilder._typeSystem.isNullable(type)) return type; - if (_needsNullCheckDueToStructure(ancestor)) { - return _addNullCheck(node, type); - } - return type; - } - - bool _needsNullCheckDueToStructure(Expression node) { - var parent = node.parent; - - if (parent is BinaryExpression) { - if (identical(node, parent.leftOperand)) { - var operatorType = parent.operator.type; - if (operatorType == TokenType.QUESTION_QUESTION || - operatorType == TokenType.EQ_EQ || - operatorType == TokenType.BANG_EQ) { - return false; - } else { - return !isNullableExtensionMember(parent.staticElement); - } - } - } else if (parent is PrefixedIdentifier) { - if (_canBeInvokedOnNullable(parent.identifier)) { - return false; - } - return identical(node, parent.prefix); - } else if (parent is PropertyAccess) { - if (_canBeInvokedOnNullable(parent.propertyName)) { - return false; - } - return !parent.isNullAware && identical(node, parent.target); - } else if (parent is MethodInvocation) { - if (_canBeInvokedOnNullable(parent.methodName)) { - return false; - } - return !parent.isNullAware && identical(node, parent.target); - } else if (parent is CascadeExpression) { - if (parent.cascadeSections.every((e) => - e is MethodInvocation && _canBeInvokedOnNullable(e.methodName) || - e is PropertyAccess && _canBeInvokedOnNullable(e.propertyName))) { - return false; - } - return !parent.isNullAware && identical(node, parent.target); - } else if (parent is IndexExpression) { - if (identical(node, parent.target)) { - return !isNullableExtensionMember(parent.staticElement); - } else { - return false; - } - } else if (parent is ConditionalExpression) { - return identical(node, parent.condition); - } else if (parent is FunctionExpressionInvocation) { - if (identical(node, parent.function)) { - return !isNullableExtensionMember(parent.staticElement); - } else { - return false; - } - } else if (parent is PrefixExpression) { - // TODO(paulberry): for prefix increment/decrement, inserting a null check - // isn't sufficient. - return !isNullableExtensionMember(parent.staticElement); - } else if (parent is ThrowExpression) { - return true; - } - return false; - } - - CollectionElement? _transformCollectionElement(CollectionElement? node) { - while (node is IfElement) { - var conditionalDiscard = _fixBuilder._variables! - .getConditionalDiscard(_fixBuilder.source, node); - if (conditionalDiscard == null || - conditionalDiscard.keepTrue && conditionalDiscard.keepFalse) { - return node; - } - var conditionValue = conditionalDiscard.keepTrue; - var ifElement = node; - node = conditionValue ? ifElement.thenElement : ifElement.elseElement; - } - return node; - } - - List _transformCollectionElements( - NodeList elements) { - return elements - .map(_transformCollectionElement) - .whereType() - .toList(); - } - - /// If [node] is an `orElse` argument to an iterable method that should be - /// transformed, transforms it and returns [type] (this indicates to the - /// caller that no further transformations to this expression need to be - /// considered); otherwise returns `null`. - DartType? _tryTransformOrElse(Expression node, DartType type) { - var transformationInfo = - _fixBuilder._whereOrNullTransformer.tryTransformOrElseArgument(node); - if (transformationInfo != null) { - // We can fix this by dropping the node and changing the method call. - _addCollectionPackageExtension('IterableExtension'); - var info = AtomicEditInfo( - NullabilityFixDescription.changeMethodName( - transformationInfo.originalName, - transformationInfo.replacementName), - {}); - (_fixBuilder._getChange(transformationInfo.methodInvocation.methodName) - as NodeChangeForMethodName) - .replaceWith(transformationInfo.replacementName, info); - (_fixBuilder._getChange(transformationInfo.methodInvocation.argumentList) - as NodeChangeForArgumentList) - .dropArgument(transformationInfo.orElseArgument, info); - _deferredExpressionProcessing[transformationInfo.methodInvocation] = - (methodInvocationType) => _fixBuilder._typeSystem - .makeNullable(methodInvocationType as TypeImpl); - return type; - } - return null; - } - - /// If [node] is a call to `Iterable.where` that should be transformed, - /// transforms it and returns the type of the transformed method call (this - /// indicates to the caller that no further transformations to this expression - /// need to be considered); otherwise returns `null`. - DartType? _tryTransformWhere(Expression node, DartType type) { - var transformationInfo = - _fixBuilder._whereNotNullTransformer.tryTransformMethodInvocation(node); - if (transformationInfo != null) { - // We can fix this by dropping the method call's argument and changing the - // call. - _addCollectionPackageExtension('IterableNullableExtension'); - var info = AtomicEditInfo( - NullabilityFixDescription.changeMethodName( - transformationInfo.originalName, - transformationInfo.replacementName), - {}); - (_fixBuilder._getChange(transformationInfo.methodInvocation.methodName) - as NodeChangeForMethodName) - .replaceWith(transformationInfo.replacementName, info); - (_fixBuilder._getChange(transformationInfo.methodInvocation.argumentList) - as NodeChangeForArgumentList) - .dropArgument(transformationInfo.argument, info); - return _fixBuilder._whereNotNullTransformer - .transformPostMigrationInvocationType(type); - } - return null; - } - - /// Runs the computation in [compute]. If an exception occurs and - /// [_fixBuilder.listener] is non-null, the exception is reported to the - /// listener and [fallback] is called to produce a result. Otherwise the - /// exception is propagated normally. - T _wrapExceptions( - AstNode? node, T Function() fallback, T Function() compute) { - if (_fixBuilder.listener == null) return compute(); - try { - return compute(); - } catch (exception, stackTrace) { - _fixBuilder.listener! - .reportException(_fixBuilder.source, node, exception, stackTrace); - return fallback(); - } - } -} - -/// Problem reported by [FixBuilder] when encountering a non-nullable unnamed -/// optional parameter that lacks a default value. -class NonNullableUnnamedOptionalParameter implements Problem { - const NonNullableUnnamedOptionalParameter(); -} - -/// Common supertype for problems reported by [FixBuilder._addProblem]. -abstract class Problem {} - -/// Specialization of [_AssignmentLikeExpressionHandler] for -/// [AssignmentExpression]. -class _AssignmentExpressionHandler extends _AssignmentLikeExpressionHandler { - @override - final AssignmentExpression node; - - _AssignmentExpressionHandler(this.node); - - @override - MethodElement? get combiner => node.staticElement; - - @override - TokenType get combinerType => node.operator.type; - - @override - Expression get target => node.leftHandSide; -} - -/// Data structure keeping track of intermediate results when the fix builder -/// is handling an assignment expression, or an expression that desugars to an -/// assignment. -abstract class _AssignmentLikeExpressionHandler { - /// For compound and null-aware assignments, the type read from the LHS. - late final DartType? readType; - - /// The type that may be written to the LHS. - late final DartType writeType; - - /// The type that should be used as a context type when inferring the RHS. - DartType? rhsContextType; - - /// Gets the static element representing the combiner. - MethodElement? get combiner; - - /// Gets the operator type representing the combiner. - TokenType get combinerType; - - /// Gets the expression in question. - Expression get node; - - /// Gets the target of the assignment. - Expression get target; - - /// Called after visiting the RHS of the assignment, to verify that for - /// compound assignments, the return value of the assignment is assignable to - /// [writeType]. - void handleAssignmentRhs( - MigrationResolutionHooksImpl hooks, DartType rhsType) { - MethodElement? combiner = this.combiner; - if (combiner != null) { - var fixBuilder = hooks._fixBuilder; - var combinerReturnType = - fixBuilder._typeSystem.refineBinaryExpressionType( - readType!, - combinerType, - rhsType, - combiner.returnType, - combiner, - ); - if (!fixBuilder._typeSystem.isSubtypeOf(combinerReturnType, writeType)) { - (fixBuilder._getChange(node) as NodeChangeForAssignmentLike) - .hasBadCombinedType = true; - } - } - } - - /// Called after visiting the LHS of the assignment. Records the [readType], - /// [writeType], and [rhsContextType]. Also verifies that for compound - /// assignments, the [readType] is non-nullable, and that for null-aware - /// assignments, the [readType] is nullable. - void handleLValueType(MigrationResolutionHooksImpl hooks, - DartType? readTypeToSet, DartType writeTypeToSet) { - assert(writeTypeToSet.nullabilitySuffix != NullabilitySuffix.star); - writeType = writeTypeToSet; - // TODO(scheglov) Remove this after the analyzer breaking change that - // will top setting types for LHS. - (target as ExpressionImpl).staticType = writeTypeToSet; - var fixBuilder = hooks._fixBuilder; - if (combinerType == TokenType.EQ) { - rhsContextType = writeTypeToSet; - } else { - readType = readTypeToSet; - assert(readType!.nullabilitySuffix != NullabilitySuffix.star); - if (combinerType == TokenType.QUESTION_QUESTION_EQ) { - rhsContextType = writeTypeToSet; - if (fixBuilder._typeSystem.isNonNullable(readType!)) { - (fixBuilder._getChange(node) as NodeChangeForAssignment) - .isWeakNullAware = true; - } - } else { - if (readType is! DynamicType && - fixBuilder._typeSystem.isPotentiallyNullable(readType!)) { - (fixBuilder._getChange(node) as NodeChangeForAssignmentLike) - .hasNullableSource = true; - } - } - } - } - - /// Called after visiting the RHS of the assignment. - DartType modifyAssignmentRhs(MigrationResolutionHooksImpl hooks, - Expression subexpression, DartType type) { - type = - hooks._modifyRValueType(subexpression, type, context: rhsContextType); - handleAssignmentRhs(hooks, type); - return type; - } -} - -/// Visitor that computes additional migrations on behalf of [FixBuilder] that -/// should be run after resolution -class _FixBuilderPostVisitor extends GeneralizingAstVisitor - with PermissiveModeVisitor { - final FixBuilder _fixBuilder; - - _FixBuilderPostVisitor(this._fixBuilder); - - @override - NullabilityMigrationListener? get listener => _fixBuilder.listener; - - @override - Source? get source => _fixBuilder.source; - - @override - void visitAsExpression(AsExpression node) { - if (!_fixBuilder._variables!.wasUnnecessaryCast(_fixBuilder.source, node) && - BestPracticesVerifier.isUnnecessaryCast( - node, _fixBuilder._typeSystem)) { - (_fixBuilder._getChange(node) as NodeChangeForAsExpression).removeAs = - true; - } - } - - @override - void visitCompilationUnit(CompilationUnit node) { - if ((node as CompilationUnitImpl).languageVersionToken != null) { - (_fixBuilder._getChange(node) as NodeChangeForCompilationUnit) - .removeLanguageVersionComment = true; - } - if (_fixBuilder.neededCollectionPackageExtensions.isNotEmpty) { - var packageCollectionImport = - _findImportDirective(node, 'package:collection/collection.dart'); - if (packageCollectionImport != null) { - for (var combinator in packageCollectionImport.combinators) { - if (combinator is ShowCombinator) { - for (var extensionName - in _fixBuilder.neededCollectionPackageExtensions) { - _ensureShows(combinator, extensionName); - } - } - } - } else { - var change = - _fixBuilder._getChange(node) as NodeChangeForCompilationUnit; - for (var extensionName - in _fixBuilder.neededCollectionPackageExtensions) { - change.addImport('package:collection/collection.dart', extensionName); - } - } - } - super.visitCompilationUnit(node); - } - - @override - void visitSimpleFormalParameter(SimpleFormalParameter node) { - if (node.type == null) { - var typeToAdd = _fixBuilder._addedParameterTypes[node.declaredElement!]; - if (typeToAdd != null) { - (_fixBuilder._getChange(node) as NodeChangeForSimpleFormalParameter) - .addExplicitType = typeToAdd; - } - } - } - - @override - void visitVariableDeclarationList(VariableDeclarationList node) { - if (node.type == null) { - // TODO(paulberry): for fields, handle inference via override as well. - List neededTypes = []; - List inferredTypes = []; - bool explicitTypeNeeded = false; - for (var variableDeclaration in node.variables) { - var neededType = _fixBuilder - ._computeMigratedType(variableDeclaration.declaredElement!); - neededTypes.add(neededType); - var inferredType = variableDeclaration.initializer?.staticType ?? - _fixBuilder.typeProvider.dynamicType; - inferredTypes.add(inferredType); - if (neededType != inferredType) { - explicitTypeNeeded = true; - } - } - if (explicitTypeNeeded) { - var firstNeededType = neededTypes[0]; - if (neededTypes.any((t) => t != firstNeededType)) { - // Different variables need different types. We handle this by - // introducing casts, which is not great but gets the job done. - for (int i = 0; i < node.variables.length; i++) { - if (neededTypes[i] != inferredTypes[i]) { - // We only have to worry about variables with initializers because - // variables without initializers will get the type `dynamic`. - var initializer = node.variables[i].initializer; - if (initializer != null) { - (_fixBuilder._getChange(initializer) as NodeChangeForExpression) - .addExpressionChange( - IntroduceAsChange(neededTypes[i], isDowncast: false), - AtomicEditInfo( - NullabilityFixDescription.otherCastExpression, {})); - } - } - } - } else { - (_fixBuilder._getChange(node) as NodeChangeForVariableDeclarationList) - .addExplicitType = firstNeededType; - } - } - } - - // Check if the nullability node for a single variable declaration has been - // declared to be late. - if (node.variables.length == 1) { - var variableElement = node.variables.single.declaredElement!; - var lateCondition = _fixBuilder._variables! - .decoratedElementType(variableElement) - .node - .lateCondition; - switch (lateCondition) { - case LateCondition.possiblyLate: - (_fixBuilder._getChange(node) as NodeChangeForVariableDeclarationList) - .lateAdditionReason = LateAdditionReason.inference; - break; - case LateCondition.possiblyLateDueToTestSetup: - (_fixBuilder._getChange(node) as NodeChangeForVariableDeclarationList) - .lateAdditionReason = LateAdditionReason.testVariableInference; - break; - case LateCondition.lateDueToHint: - // Handled below. - case LateCondition.notLate: - // Nothing to do. - } - } - - var lateHint = _fixBuilder._variables!.getLateHint(source, node); - if (lateHint != null) { - (_fixBuilder._getChange(node) as NodeChangeForVariableDeclarationList) - .lateHint = lateHint; - } - super.visitVariableDeclarationList(node); - } - - /// Creates the necessary changes to ensure that [combinator] shows [name]. - void _ensureShows(ShowCombinator combinator, String name) { - if (combinator.shownNames.any((shownName) => shownName.name == name)) { - return; - } - (_fixBuilder._getChange(combinator) as NodeChangeForShowCombinator) - .addName(name); - } - - /// Searches [unit] for an unprefixed import directive whose URI matches - /// [uri], returning it if found, or `null` if not found. - ImportDirective? _findImportDirective(CompilationUnit unit, String uri) { - for (var directive in unit.directives) { - if (directive is ImportDirective && - directive.prefix == null && - directive.uri.stringValue == uri) { - return directive; - } - } - return null; - } -} - -/// Visitor that computes additional migrations on behalf of [FixBuilder] that -/// don't need to be integrated into the resolver itself, and should be run -/// prior to resolution -class _FixBuilderPreVisitor extends GeneralizingAstVisitor - with PermissiveModeVisitor { - final FixBuilder _fixBuilder; - - _FixBuilderPreVisitor(this._fixBuilder); - - @override - NullabilityMigrationListener? get listener => _fixBuilder.listener; - - @override - Source? get source => _fixBuilder.source; - - @override - void visitDefaultFormalParameter(DefaultFormalParameter node) { - var element = node.declaredElement; - if (node.defaultValue == null) { - var requiredHint = - _fixBuilder._variables!.getRequiredHint(_fixBuilder.source, node); - var nullabilityNode = - _fixBuilder._variables!.decoratedElementType(element!).node; - if (!nullabilityNode.isNullable) { - var enclosingElement = element.enclosingElement; - if (enclosingElement is ConstructorElement && - enclosingElement.isFactory && - enclosingElement.redirectedConstructor != null && - !node.declaredElement!.hasRequired) { - // Redirecting factory constructors inherit their parameters' default - // values from the constructors they redirect to, so the lack of a - // default value doesn't mean the parameter has to be nullable. - } else if (element.isNamed) { - _addRequiredKeyword(node, nullabilityNode, requiredHint); - } else { - _fixBuilder._addProblem( - node, const NonNullableUnnamedOptionalParameter()); - } - } else if (requiredHint != null || - element.metadata.any((m) => m.isRequired)) { - _addRequiredKeyword(node, nullabilityNode, requiredHint); - } - } - super.visitDefaultFormalParameter(node); - } - - @override - void visitFieldFormalParameter(FieldFormalParameter node) { - if (node.type == null) { - // Potentially add an explicit type to a field formal parameter. - var decl = node.declaredElement as FieldFormalParameterElement; - var decoratedType = _fixBuilder._variables!.decoratedElementType(decl); - var field = decl.field; - if (field != null) { - var decoratedFieldType = - _fixBuilder._variables!.decoratedElementType(field); - var typeToAdd = _fixBuilder._variables!.toFinalType(decoratedType); - var fieldFinalType = - _fixBuilder._variables!.toFinalType(decoratedFieldType); - if (typeToAdd is InterfaceType && - !_fixBuilder._typeSystem.isSubtypeOf(fieldFinalType, typeToAdd)) { - (_fixBuilder._getChange(node) as NodeChangeForFieldFormalParameter) - .addExplicitType = typeToAdd; - } - } - } else if (node.parameters != null) { - // Handle function-typed field formal parameters. - var decoratedType = - _fixBuilder._variables!.decoratedElementType(node.declaredElement!); - if (decoratedType.node.isNullable) { - (_fixBuilder._getChange(node) as NodeChangeForFieldFormalParameter) - .recordNullability(decoratedType, decoratedType.node.isNullable, - nullabilityHint: - _fixBuilder._variables!.getNullabilityHint(source, node)); - } - } - super.visitFieldFormalParameter(node); - } - - @override - void visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) { - var decoratedType = - _fixBuilder._variables!.decoratedElementType(node.declaredElement!); - if (decoratedType.node.isNullable) { - (_fixBuilder._getChange(node) - as NodeChangeForFunctionTypedFormalParameter) - .recordNullability(decoratedType, decoratedType.node.isNullable, - nullabilityHint: - _fixBuilder._variables!.getNullabilityHint(source, node)); - } - super.visitFunctionTypedFormalParameter(node); - } - - @override - void visitGenericFunctionType(GenericFunctionType node) { - var decoratedType = _fixBuilder._variables! - .decoratedTypeAnnotation(_fixBuilder.source, node); - if (!typeIsNonNullableByContext(node)) { - _makeTypeNameNullable(node, decoratedType); - } - (node as GenericFunctionTypeImpl).type = - _fixBuilder._variables!.toFinalType(decoratedType); - super.visitGenericFunctionType(node); - } - - @override - void visitMethodDeclaration(MethodDeclaration node) { - var nullableAnnotation = BuiltValueTransformer.findNullableAnnotation(node); - if (nullableAnnotation != null) { - var info = AtomicEditInfo( - NullabilityFixDescription.removeNullableAnnotation, {}); - (_fixBuilder._getChange(node) as NodeChangeForMethodDeclaration) - ..annotationToRemove = nullableAnnotation - ..removeAnnotationInfo = info; - } - super.visitMethodDeclaration(node); - } - - @override - void visitNamedType(NamedType node) { - var decoratedType = _fixBuilder._variables! - .decoratedTypeAnnotation(_fixBuilder.source, node); - if (!typeIsNonNullableByContext(node)) { - if (!_typeIsNaturallyNullable(decoratedType.type!)) { - _makeTypeNameNullable(node, decoratedType); - } - } - (node as NamedTypeImpl).type = - _fixBuilder._variables!.toFinalType(decoratedType); - super.visitNamedType(node); - } - - void _addRequiredKeyword(DefaultFormalParameter parameter, - NullabilityNode node, HintComment? requiredHint) { - // Change an existing `@required` annotation into a `required` keyword if - // possible. - final element = parameter.declaredElement!; - final method = element.enclosingElement!; - final cls = method.enclosingElement!; - var info = AtomicEditInfo( - NullabilityFixDescription.addRequired( - cls.name, method.name, element.name), - {FixReasonTarget.root: node}); - var metadata = parameter.metadata; - if (metadata.isNotEmpty) { - // Only the last annotation can be changed into a `required` keyword; - // changing an earlier annotation into a keyword would be illegal. - var lastAnnotation = metadata.last; - if (lastAnnotation.elementAnnotation!.isRequired) { - (_fixBuilder._getChange(lastAnnotation) as NodeChangeForAnnotation) - ..changeToRequiredKeyword = true - ..changeToRequiredKeywordInfo = info; - return; - } - } - // Otherwise create a new `required` keyword. - var nodeChange = (_fixBuilder._getChange(parameter) - as NodeChangeForDefaultFormalParameter) - ..addRequiredKeyword = true - ..addRequiredKeywordInfo = info - ..requiredHint = requiredHint; - var requiredAnnotation = metadata.firstWhereOrNull( - (annotation) => annotation.elementAnnotation!.isRequired); - if (requiredAnnotation != null) { - // If the parameter was annotated with `@required`, but it was not the - // last annotation, we remove the annotation in addition to adding the - // `required` keyword. - nodeChange - ..annotationToRemove = requiredAnnotation - ..removeAnnotationInfo = info; - } - } - - void _makeTypeNameNullable(TypeAnnotation node, DecoratedType decoratedType) { - bool makeNullable = decoratedType.node.isNullable; - if (decoratedType.type!.isDartAsyncFutureOr) { - var typeArguments = decoratedType.typeArguments; - if (typeArguments.length == 1) { - var typeArgument = typeArguments[0]!; - if (_typeIsNaturallyNullable(typeArgument.type!) || - typeArgument.node.isNullable) { - // FutureOr? is equivalent to FutureOr, so there is no need to - // make this type nullable. - makeNullable = false; - } - } - } - (_fixBuilder._getChange(node) as NodeChangeForTypeAnnotation) - .recordNullability( - decoratedType, makeNullable, - nullabilityHint: - _fixBuilder._variables!.getNullabilityHint(source, node)); - } - - bool _typeIsNaturallyNullable(DartType type) => - type is DynamicType || type is VoidType || type.isDartCoreNull; -} - -/// Specialization of [_AssignmentLikeExpressionHandler] for -/// [PostfixExpression]. -class _PostfixExpressionHandler extends _AssignmentLikeExpressionHandler { - @override - final PostfixExpression node; - - _PostfixExpressionHandler(this.node) - : assert(_isIncrementOrDecrementOperator(node.operator.type)); - - @override - MethodElement? get combiner => node.staticElement; - - @override - TokenType get combinerType => node.operator.type; - - @override - Expression get target => node.operand; -} - -/// Specialization of [_AssignmentLikeExpressionHandler] for -/// [PrefixExpression]. -class _PrefixExpressionHandler extends _AssignmentLikeExpressionHandler { - @override - final PrefixExpression node; - - _PrefixExpressionHandler(this.node) - : assert(_isIncrementOrDecrementOperator(node.operator.type)); - - @override - MethodElement? get combiner => node.staticElement; - - @override - TokenType get combinerType => node.operator.type; - - @override - Expression get target => node.operand; -} diff --git a/pkg/nnbd_migration/lib/src/front_end/charcodes.dart b/pkg/nnbd_migration/lib/src/front_end/charcodes.dart deleted file mode 100644 index 72c75ccc7947..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/charcodes.dart +++ /dev/null @@ -1,12 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -/// "Carriage return" control character. -const int $cr = 0x0d; - -/// "Line feed" control character. -const int $lf = 0x0a; - -/// Space character. -const int $space = 0x20; diff --git a/pkg/nnbd_migration/lib/src/front_end/dartfix_listener.dart b/pkg/nnbd_migration/lib/src/front_end/dartfix_listener.dart deleted file mode 100644 index 43e1421e5ad7..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/dartfix_listener.dart +++ /dev/null @@ -1,83 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/source/source.dart'; -import 'package:analyzer_plugin/protocol/protocol_common.dart' - hide AnalysisError; -import 'package:nnbd_migration/src/front_end/driver_provider_impl.dart'; -import 'package:pub_semver/src/version.dart'; - -class DartFixListener { - final DriverProviderImpl? server; - - final SourceChange sourceChange = SourceChange('null safety migration'); - - final List suggestions = []; - - final DartFixListenerClient client; - - DartFixListener(this.server, this.client); - - /// Record an edit to be sent to the client. - /// - /// The associated suggestion should be separately added by calling - /// [addSuggestion]. - void addEditWithoutSuggestion(Source source, SourceEdit edit) { - sourceChange.addEdit(source.fullName, -1, edit); - } - - /// Record a source change to be sent to the client. - void addSourceFileEdit( - String description, Location location, SourceFileEdit fileEdit) { - suggestions.add(DartFixSuggestion(description, location: location)); - for (var sourceEdit in fileEdit.edits) { - sourceChange.addEdit(fileEdit.file, fileEdit.fileStamp, sourceEdit); - } - } - - /// Record a suggestion to be sent to the client. - /// - /// The associated edits should be separately added by calling - /// [addEditWithoutRecommendation]. - void addSuggestion(String description, Location location) { - suggestions.add(DartFixSuggestion(description, location: location)); - } - - /// Reports to then user that they need to run `dart pub get` after the - /// migration finishes. - void reportPubGetNeeded(Map neededPackages) { - client.onMessage( - 'Your pubspec has been updated. Please run `dart pub get`.'); - } - - /// Reset this listener so that it can accrue a new set of changes. - void reset() { - suggestions.clear(); - sourceChange - ..edits.clear() - ..linkedEditGroups.clear() - ..selection = null - ..id = null; - } -} - -abstract class DartFixListenerClient { - /// Add the given [detail] to the list of details to be returned to the - /// client. - void onException(String detail); - - /// Callback that reports a fatal error to the client. - void onFatalError(String detail); - - /// Reports the given [detail] message to the client; not an error condition. - void onMessage(String detail); -} - -class DartFixSuggestion { - final String description; - - final Location location; - - DartFixSuggestion(this.description, {required this.location}); -} diff --git a/pkg/nnbd_migration/lib/src/front_end/driver_provider_impl.dart b/pkg/nnbd_migration/lib/src/front_end/driver_provider_impl.dart deleted file mode 100644 index ac3c21fcd3a0..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/driver_provider_impl.dart +++ /dev/null @@ -1,20 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/analysis/analysis_context.dart'; -import 'package:analyzer/dart/analysis/session.dart'; -import 'package:analyzer/file_system/file_system.dart' show ResourceProvider; - -class DriverProviderImpl { - final ResourceProvider resourceProvider; - - final AnalysisContext? analysisContext; - - DriverProviderImpl(this.resourceProvider, this.analysisContext); - - /// Return the appropriate analysis session for the file with the given - /// [path]. - AnalysisSession getAnalysisSession(String? path) => - analysisContext!.currentSession; -} diff --git a/pkg/nnbd_migration/lib/src/front_end/info_builder.dart b/pkg/nnbd_migration/lib/src/front_end/info_builder.dart deleted file mode 100644 index c0f99d62a30f..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/info_builder.dart +++ /dev/null @@ -1,704 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'dart:collection'; - -import 'package:analyzer/dart/analysis/features.dart'; -import 'package:analyzer/dart/analysis/results.dart'; -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:analyzer/file_system/file_system.dart'; -import 'package:analyzer/src/dart/ast/utilities.dart'; -import 'package:analyzer_plugin/protocol/protocol_common.dart' - show SourceFileEdit; -import 'package:analyzer_plugin/protocol/protocol_common.dart' as protocol; -import 'package:analyzer_plugin/src/utilities/navigation/navigation.dart'; -import 'package:analyzer_plugin/utilities/navigation/navigation_dart.dart'; -import 'package:cli_util/cli_logging.dart'; -import 'package:meta/meta.dart'; -import 'package:nnbd_migration/fix_reason_target.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; -import 'package:nnbd_migration/src/edit_plan.dart'; -import 'package:nnbd_migration/src/front_end/dartfix_listener.dart'; -import 'package:nnbd_migration/src/front_end/driver_provider_impl.dart'; -import 'package:nnbd_migration/src/front_end/instrumentation_information.dart'; -import 'package:nnbd_migration/src/front_end/migration_info.dart'; -import 'package:nnbd_migration/src/front_end/offset_mapper.dart'; -import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart'; -import 'package:nnbd_migration/src/hint_action.dart'; -import 'package:nnbd_migration/src/utilities/progress_bar.dart'; - -/// A builder used to build the migration information for a library. -class InfoBuilder { - /// The node mapper for the migration state. - NodeMapper? nodeMapper; - - /// The logger to use for showing progress when explaining the migration. - final Logger _logger; - - /// The resource provider used to access the file system. - ResourceProvider provider; - - String? includedPath; - - /// The instrumentation information gathered while the migration engine was - /// running. - final InstrumentationInformation info; - - /// The listener used to gather the changes to be applied. - final DartFixListener? listener; - - /// The [NullabilityMigration] instance for this migration. - final NullabilityMigration? migration; - - /// A map from the path of a compilation unit to the information about that - /// unit. - final Map unitMap = {}; - - /// A function which returns whether a file at a given path should be - /// migrated. - final bool Function(String?) shouldBeMigratedFunction; - - /// The set of files which are being considered for migration. - final Iterable? _pathsToProcess; - - /// Initialize a newly created builder. - InfoBuilder( - this.provider, - this.includedPath, - this.info, - this.listener, - this.migration, - this.nodeMapper, - this._logger, - this.shouldBeMigratedFunction, - this._pathsToProcess); - - /// The provider used to get information about libraries. - DriverProviderImpl? get driverProvider => listener!.server; - - /// Return the migration information for all of the libraries that were - /// migrated. - Future> explainMigration() async { - var sourceInfoMap = info.sourceInformation; - Set units = - SplayTreeSet((u1, u2) => u1.path!.compareTo(u2.path!)); - - // Collect all of the sources for which we have [SourceInformation], as well - // as all files which are being "processed" during this migration, which may - // include already migrated files. - var sources = { - ...sourceInfoMap.keys.map((source) => source!.fullName), - ..._pathsToProcess!, - }; - var progressBar = ProgressBar(_logger, sources.length); - - for (var filePath in sources) { - progressBar.tick(); - var session = driverProvider!.getAnalysisSession(filePath); - var result = await session.getResolvedLibrary(filePath!); - if (result is ResolvedLibraryResult) { - for (var unitResult in result.units) { - var sourceInfo = - sourceInfoMap[unitResult.unit.declaredElement!.source]; - // Note: there might have been no information for this unit in - // sourceInfoMap. That can happen if there's an already-migrated - // library being referenced by the code being migrated, but not all - // parts of that library are referenced. To avoid exceptions later - // on, we just create an empty SourceInformation object. - // TODO(paulberry): we don't do a good job of the case where the - // already-migrated library's defining compilation unit isn't - // referenced (we'll just skip the entire library because we'll only - // ever see its parts). - sourceInfo ??= SourceInformation(); - var edit = listener!.sourceChange.getFileEdit(unitResult.path); - var unit = _explainUnit(sourceInfo, unitResult, edit); - if (_pathsToProcess!.contains(unitResult.path)) { - units.add(unit); - } - } - } - } - progressBar.complete(); - return units; - } - - Iterable upstreamTriggeredEdges(NullabilityNodeInfo node, - {bool skipExactNullable = true}) { - var edges = []; - for (var edge in node.upstreamEdges) { - if (skipExactNullable && - node.isExactNullable && - edge.sourceNode!.isExactNullable) { - // When an exact nullable points here, the nullability propagated - // in the other direction. - continue; - } - if (edge.isTriggered) { - edges.add(edge); - } - } - for (final containerNode in node.outerCompoundNodes) { - // We must include the exact nullable edges in the upstream triggered - // edges of the container node. If this node is in a substitution node, - // then it's possible it was marked exact nullable because it's container - // was marked nullable. It's container could have been marked nullable by - // another exact nullable node. We cannot tell. Err on the side of - // surfacing too many reasons. - edges.addAll( - upstreamTriggeredEdges(containerNode, skipExactNullable: false)); - } - - return edges; - } - - void _addSimpleTrace(SimpleFixReasonInfo info, List traces) { - traces.add(TraceInfo( - 'Reason', [_makeTraceEntry(info.description, info.codeReference)])); - } - - /// Returns a list of edits that can be applied. - List _computeEdits( - AtomicEditInfo fixInfo, int offset, ResolvedUnitResult result) { - var content = result.content; - - EditDetail removeHint(String description) => EditDetail.fromSourceEdit( - description, - fixInfo.hintComment!.changesToRemove(content).toSourceEdits().single); - - EditDetail changeHint(String description, String replacement) => - EditDetail.fromSourceEdit( - description, - fixInfo.hintComment! - .changesToReplace(content, replacement) - .toSourceEdits() - .single); - - var edits = []; - var fixKind = fixInfo.description.kind; - switch (fixKind) { - case NullabilityFixKind.addLateDueToHint: - edits.add(removeHint('Remove /*late*/ hint')); - break; - case NullabilityFixKind.addLateFinalDueToHint: - edits.add(removeHint('Remove /*late final*/ hint')); - break; - case NullabilityFixKind.addRequired: - var metaImport = - _findImportDirective(result.unit, 'package:meta/meta.dart'); - if (metaImport == null) { - edits.add( - EditDetail('Add /*required*/ hint', offset, 0, '/*required*/ ')); - } else { - var prefix = metaImport.prefix?.name; - if (prefix == null) { - edits.add( - EditDetail("Mark with '@required'", offset, 0, '@required ')); - } else { - edits.add(EditDetail( - "Mark with '@required'", offset, 0, '@$prefix.required ')); - } - } - break; - case NullabilityFixKind.checkExpression: - // TODO(brianwilkerson) Determine whether we can know that the fix is - // associated with a parameter and insert an assert if it is. - edits.add(EditDetail('Add /*!*/ hint', offset, 0, '/*!*/')); - break; - case NullabilityFixKind.checkExpressionDueToHint: - edits.add(removeHint('Remove /*!*/ hint')); - break; - case NullabilityFixKind.downcastExpression: - case NullabilityFixKind.otherCastExpression: - // There's no useful hint to apply to casts. - break; - case NullabilityFixKind.removeAs: - case NullabilityFixKind.removeDeadCode: - case NullabilityFixKind.removeLanguageVersionComment: - // There's no need for hints around code that is being removed. - break; - case NullabilityFixKind.addType: - case NullabilityFixKind.replaceVar: - // There's no need for hints around inserted types. - break; - case NullabilityFixKind.makeTypeNullable: - case NullabilityFixKind.typeNotMadeNullable: - edits.add(EditDetail('Add /*!*/ hint', offset, 0, '/*!*/')); - edits.add(EditDetail('Add /*?*/ hint', offset, 0, '/*?*/')); - var declarationList = _findVariableDeclaration(result.unit, offset); - if (declarationList != null) { - var lateOffset = _offsetForPossibleLateModifier(declarationList); - if (lateOffset != null) { - edits.add(EditDetail('Add late hint', lateOffset, 0, '/*late*/')); - } - } - break; - case NullabilityFixKind.makeTypeNullableDueToHint: - edits.add(changeHint('Change to /*!*/ hint', '/*!*/')); - edits.add(removeHint('Remove /*?*/ hint')); - break; - case NullabilityFixKind.typeNotMadeNullableDueToHint: - edits.add(removeHint('Remove /*!*/ hint')); - edits.add(changeHint('Change to /*?*/ hint', '/*?*/')); - break; - case NullabilityFixKind.addLate: - case NullabilityFixKind.addLateDueToTestSetup: - // We could add an edit to add a `/*?*/` hint, but the offset is a - // little tricky. - break; - case NullabilityFixKind.conditionFalseInStrongMode: - case NullabilityFixKind.conditionTrueInStrongMode: - case NullabilityFixKind.nullAwarenessUnnecessaryInStrongMode: - case NullabilityFixKind.nullAwareAssignmentUnnecessaryInStrongMode: - // We don't offer any edits around weak-only code. - // TODO(paulberry): offer edits to delete the code that would be dead in - // strong mode (https://github.com/dart-lang/sdk/issues/41554). - break; - case NullabilityFixKind.compoundAssignmentHasBadCombinedType: - case NullabilityFixKind.compoundAssignmentHasNullableSource: - // We don't offer any edits around bad compound assignments or bad - // increment/decrement operations. - break; - case NullabilityFixKind.addImport: - case NullabilityFixKind.changeMethodName: - // These fix kinds have to do with changing iterable method calls to - // their "OrNull" equivalents. We don't offer any hints around - // this transformation. - break; - case NullabilityFixKind.noValidMigrationForNull: - // We don't offer any edits around unmigratable `null`s. The user has - // to fix manually. - break; - case NullabilityFixKind.addThen: - // We don't offer any edits around addition of `.then` to a future. - break; - case NullabilityFixKind.removeNullableAnnotation: - // We don't offer any edits around removal of built_value `@nullable` - // annotations. - break; - } - return edits; - } - - /// Return the navigation sources for the unit associated with the [result]. - List _computeNavigationSources(ResolvedUnitResult result) { - var collector = NavigationCollectorImpl(); - computeDartNavigation( - result.session.resourceProvider, collector, result, null, null); - collector.createRegions(); - var files = collector.files; - var regions = collector.regions; - var rawTargets = collector.targets; - var convertedTargets = - List.filled(rawTargets.length, null); - return regions.map((region) { - var targets = region.targets; - if (targets.isEmpty) { - throw StateError('Targets is empty'); - } - var target = convertedTargets[targets[0]]; - if (target == null) { - var rawTarget = rawTargets[targets[0]]; - target = _targetForRawTarget(files[rawTarget.fileIndex], rawTarget); - convertedTargets[targets[0]] = target; - } - return NavigationSource( - region.offset, null /* line */, region.length, target); - }).toList(); - } - - void _computeTraceNonNullableInfo(NullabilityNodeInfo node, - List traces, FixReasonTarget target) { - var entries = []; - var description = 'Non-nullability reason${target.suffix}'; - var step = node.whyNotNullable; - if (step == null) { - if (node != info.never) { - // 'never' indicates we're describing an edge to never, such as a `!`. - traces.add(TraceInfo(description, [ - _nodeToTraceEntry(node, - description: 'No reason found to make nullable') - ])); - } - return; - } - assert(identical(step.node, node)); - while (step != null && !step.isStartingPoint) { - entries.add(_nodeToTraceEntry(step.node)); - if (step.codeReference != null) { - entries.add(_stepToTraceEntry(step)); - } - step = step.principalCause; - } - traces.add(TraceInfo(description, entries)); - } - - void _computeTraceNullableInfo(NullabilityNodeInfo node, - List traces, FixReasonTarget target) { - var entries = []; - var step = node.whyNullable; - if (step == null) { - return; - } - assert(identical(step.targetNode, node)); - while (step != null) { - entries.add(_nodeToTraceEntry(step.targetNode!)); - if (step.codeReference != null) { - entries.add(_stepToTraceEntry(step)); - } - step = step.principalCause; - } - var description = 'Nullability reason${target.suffix}'; - traces.add(TraceInfo(description, entries)); - } - - List _computeTraces( - Map fixReasons) { - var traces = []; - for (var entry in fixReasons.entries) { - var reason = entry.value; - if (reason is NullabilityNodeInfo) { - if (reason.isNullable) { - _computeTraceNullableInfo(reason, traces, FixReasonTarget.root); - } else { - _computeTraceNonNullableInfo(reason, traces, FixReasonTarget.root); - } - } else if (reason is EdgeInfo) { - if (reason.sourceNode!.isNullable && - !reason.destinationNode.isNullable) { - var target = entry.key!; - _computeTraceNullableInfo(reason.sourceNode!, traces, target); - _computeTraceNonNullableInfo(reason.destinationNode, traces, target); - } - } else if (reason is SimpleFixReasonInfo) { - _addSimpleTrace(reason, traces); - } else { - assert(false, 'Unrecognized reason type: ${reason.runtimeType}'); - } - } - return traces; - } - - /// Return the migration information for the unit associated with the - /// [result]. - UnitInfo _explainUnit(SourceInformation sourceInfo, ResolvedUnitResult result, - SourceFileEdit? fileEdit) { - var unitInfo = _unitForPath(result.path); - unitInfo.sources ??= _computeNavigationSources(result); - var content = result.content; - unitInfo.diskContent = content; - var alreadyMigrated = - result.unit.featureSet.isEnabled(Feature.non_nullable); - unitInfo.wasExplicitlyOptedOut = result.unit.languageVersionToken != null; - if (alreadyMigrated) { - unitInfo.migrationStatus = UnitMigrationStatus.alreadyMigrated; - unitInfo.migrationStatusCanBeChanged = false; - } else if (shouldBeMigratedFunction(result.path)) { - unitInfo.migrationStatus = UnitMigrationStatus.migrating; - unitInfo.migrationStatusCanBeChanged = true; - } else { - unitInfo.migrationStatus = UnitMigrationStatus.optingOut; - unitInfo.migrationStatusCanBeChanged = false; - } - var regions = unitInfo.regions; - - // There are certain rare conditions involving generated code in a bazel - // workspace that can cause a source file to get processed more than once by - // the migration tool (sometimes with a correct URI, sometimes with an - // incorrect URI that corresponds to a file path in the `bazel-out` - // directory). That can cause this method to get called twice for the same - // unit. To avoid this creating user-visible problems, we need to ensure - // that any regions left over from the previous invocation are cleared out - // before we re-populate the region list. - regions.clear(); - - var lineInfo = result.unit.lineInfo; - var insertions = >{}; - var infosSeen = Set.identity(); - - // Apply edits and build the regions. - var changes = sourceInfo.changes ?? {}; - var sourceOffsets = changes.keys.toList(); - sourceOffsets.sort(); - var offset = 0; - var sourceOffset = 0; - for (var nextSourceOffset in sourceOffsets) { - var changesForSourceOffset = changes[nextSourceOffset]!; - var unchangedTextLength = nextSourceOffset! - sourceOffset; - offset += unchangedTextLength; - sourceOffset += unchangedTextLength; - for (var edit in changesForSourceOffset) { - var length = edit.length; - var replacement = edit.replacement; - var end = offset + length; - // Insert the replacement text without deleting the replaced text. - if (replacement.isNotEmpty) { - content = content.replaceRange(end, end, replacement); - (insertions[sourceOffset] ??= []).add(AtomicEdit.insert(replacement)); - } - var info = edit.info; - var edits = info != null - ? _computeEdits(info, sourceOffset, result) - : []; - var lineNumber = lineInfo.getLocation(sourceOffset).lineNumber; - var traces = info == null - ? const [] - : _computeTraces(info.fixReasons); - var description = info?.description; - var isCounted = info != null && infosSeen.add(info); - var explanation = description?.appliedMessage; - var kind = description?.kind; - if (edit.isInsertion) { - regions.add(RegionInfo( - edit.isInformative ? RegionType.informative : RegionType.add, - offset, - replacement.length, - lineNumber, - explanation, - kind, - isCounted, - edits: edits, - traces: traces)); - } else if (edit.isDeletion) { - regions.add(RegionInfo( - edit.isInformative ? RegionType.informative : RegionType.remove, - offset, - length, - lineNumber, - explanation, - kind, - isCounted, - edits: edits, - traces: traces)); - } else if (edit.isReplacement) { - assert(!edit.isInformative); - regions.add(RegionInfo(RegionType.remove, offset, length, lineNumber, - explanation, kind, isCounted, - edits: edits, traces: traces)); - regions.add(RegionInfo(RegionType.add, end, replacement.length, - lineNumber, explanation, kind, isCounted, - edits: edits, traces: traces)); - } else { - throw StateError( - 'Edit is not an insertion, deletion, replacement, nor ' - 'informative: $edit'); - } - sourceOffset += length; - offset += length + replacement.length; - } - } - - // Build the map from source file offset to offset in the modified text. - // We only account for insertions because in the code above, we don't delete - // the modified text. - var edits = insertions.toSourceEdits(); - edits.sort((first, second) => first.offset.compareTo(second.offset)); - var mapper = OffsetMapper.forEdits(edits); - regions.sort((first, second) => first.offset.compareTo(second.offset)); - unitInfo.migrationOffsetMapper = mapper; - unitInfo.content = content; - return unitInfo; - } - - /// Searches [unit] for an import directive whose URI matches [uri], returning - /// it if found, or `null` if not found. - ImportDirective? _findImportDirective(CompilationUnit unit, String uri) { - for (var directive in unit.directives) { - if (directive is ImportDirective && directive.uri.stringValue == uri) { - return directive; - } - } - return null; - } - - /// Returns the variable declaration which covers [offset], or `null` if none - /// does. - VariableDeclarationList? _findVariableDeclaration( - CompilationUnit unit, int offset) { - var nodeLocator = NodeLocator2(offset); - var node = nodeLocator.searchWithin(unit); - if (node == null) { - return null; - } - return node.thisOrAncestorOfType(); - } - - TraceEntryInfo _makeTraceEntry( - String description, CodeReference? codeReference, - {List hintActions = const []}) { - var length = 1; // TODO(paulberry): figure out the correct value. - return TraceEntryInfo( - description, - codeReference?.function, - codeReference == null - ? null - : NavigationTarget(codeReference.path, codeReference.offset, - codeReference.line, length), - hintActions: hintActions); - } - - TraceEntryInfo _nodeToTraceEntry(NullabilityNodeInfo node, - {String? description}) { - description ??= node.toString(); // TODO(paulberry): improve this message - return _makeTraceEntry(description, node.codeReference, - hintActions: node.hintActions.keys - .map((kind) => HintAction(kind, nodeMapper!.idForNode(node))) - .toList()); - } - - /// Returns the offset for a possible `late` modifier which could be inserted - /// into [declarationList], or `null` if none is possible. - int? _offsetForPossibleLateModifier(VariableDeclarationList declarationList) { - if (declarationList.isLate || declarationList.isConst) { - // Don't offer an offset. - return null; - } - var keyword = declarationList.keyword; - if (keyword != null) { - // Offset for possible `late` is before `var`, `const`, or `final`. - return keyword.offset; - } - - var typeAnnotation = declarationList.type; - if (typeAnnotation != null) { - // Without a `keyword`, offset for possible `late` is before the type - // annotation. - return typeAnnotation.offset; - } - - assert( - false, - 'In this VariableDeclarationList, there is no `var`, ' - '`const`, or `final` keyword, nor any type annotation. This variable ' - 'declaration list is not valid: $declarationList'); - return null; - } - - TraceEntryInfo _stepToTraceEntry(PropagationStepInfo step) { - var description = step.edge?.description; - description ??= step.toString(); // TODO(paulberry): improve this message. - return _makeTraceEntry(description, step.codeReference); - } - - /// Return the navigation target in the file with the given [filePath] at the - /// given [offset] ans with the given [length]. - NavigationTarget _targetForRawTarget( - String filePath, protocol.NavigationTarget rawTarget) { - var unitInfo = _unitForPath(filePath); - var offset = rawTarget.offset; - var length = rawTarget.length; - var target = NavigationTarget(filePath, offset, null /* line */, length); - unitInfo.targets.add(target); - return target; - } - - /// Return the unit info for the file at the given [path]. - UnitInfo _unitForPath(String? path) { - return unitMap.putIfAbsent(path, () => UnitInfo(path)); - } - - /// Builds a description for [node]'s enclosing member(s). - /// - /// This may include a class and method name, for example, or the name of the - /// enclosing top-level member. - @visibleForTesting - static String buildEnclosingMemberDescription(AstNode? node) { - for (var enclosingNode = node; - enclosingNode != null; - enclosingNode = enclosingNode.parent) { - if (enclosingNode is ConstructorDeclaration) { - if (enclosingNode.name == null) { - return _describeClassOrExtensionMember( - enclosingNode.parent as CompilationUnitMember?, - 'the default constructor of', - ''); - } else { - return _describeClassOrExtensionMember( - enclosingNode.parent as CompilationUnitMember?, - 'the constructor', - enclosingNode.name!.lexeme); - } - } else if (enclosingNode is MethodDeclaration) { - var functionName = enclosingNode.name.lexeme; - String baseDescription; - if (enclosingNode.isGetter) { - baseDescription = 'the getter'; - } else if (enclosingNode.isOperator) { - baseDescription = 'the operator'; - } else if (enclosingNode.isSetter) { - baseDescription = 'the setter'; - functionName += '='; - } else { - baseDescription = 'the method'; - } - return _describeClassOrExtensionMember( - enclosingNode.parent as CompilationUnitMember?, - baseDescription, - functionName); - } else if (enclosingNode is FunctionDeclaration && - enclosingNode.parent is CompilationUnit) { - var functionName = enclosingNode.name.lexeme; - String baseDescription; - if (enclosingNode.isGetter) { - baseDescription = 'the getter'; - } else if (enclosingNode.isSetter) { - baseDescription = 'the setter'; - functionName += '='; - } else { - baseDescription = 'the function'; - } - return "$baseDescription '$functionName'"; - } else if (enclosingNode is VariableDeclaration) { - var description = _describeVariableDeclaration(enclosingNode); - if (description != null) return description; - } else if (enclosingNode is VariableDeclarationList) { - var description = - _describeVariableDeclaration(enclosingNode.variables[0]); - if (description != null) return description; - } - } - throw ArgumentError( - "Can't describe enclosing member of ${node.runtimeType}"); - } - - static String _describeClassOrExtensionMember(CompilationUnitMember? parent, - String baseDescription, String functionName) { - if (parent is NamedCompilationUnitMember) { - var parentName = parent.name.lexeme; - if (functionName.isEmpty) { - return "$baseDescription '$parentName'"; - } else { - return "$baseDescription '$parentName.$functionName'"; - } - } else if (parent is ExtensionDeclaration) { - if (parent.name == null) { - var extendedTypeString = parent.extendedType.type!.getDisplayString( - withNullability: false, - ); - return "$baseDescription '$functionName' in unnamed extension on $extendedTypeString"; - } else { - return "$baseDescription '${parent.name!.lexeme}.$functionName'"; - } - } else { - throw ArgumentError( - 'Unexpected class or extension type ${parent.runtimeType}'); - } - } - - static String? _describeVariableDeclaration(VariableDeclaration node) { - var variableName = node.name.lexeme; - var parent = node.parent!; - var grandParent = parent.parent; - if (grandParent is FieldDeclaration) { - return _describeClassOrExtensionMember( - grandParent.parent as CompilationUnitMember?, - 'the field', - variableName); - } else if (grandParent is TopLevelVariableDeclaration) { - return "the variable '$variableName'"; - } else { - return null; - } - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/instrumentation_information.dart b/pkg/nnbd_migration/lib/src/front_end/instrumentation_information.dart deleted file mode 100644 index 3d8a20a11a36..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/instrumentation_information.dart +++ /dev/null @@ -1,77 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/src/edit_plan.dart'; - -/// The instrumentation information gathered from the migration engine. -class InstrumentationInformation { - /// The node used for type sources that are always `null`. - NullabilityNodeInfo? always; - - /// A map from the graph edges between nullability nodes, to information about - /// the edge that was created and why it was created. - final Map edgeOrigin = {}; - - /// The node used for type sources that are never `null`. - NullabilityNodeInfo? never; - - /// The instrumentation information that is specific to a single source. - final Map sourceInformation = {}; - - /// Initialize a newly created holder of instrumentation information. - InstrumentationInformation(); - - /// Return the type annotation associated with the [node] or `null` if the - /// node represents an implicit type. - TypeAnnotation? typeAnnotationForNode(NullabilityNodeInfo node) { - for (var sourceEntry in sourceInformation.entries) { - for (var typeEntry in sourceEntry.value.explicitTypeNullability.entries) { - if (typeEntry.value == node) { - return typeEntry.key; - } - } - } - return null; - } -} - -/// The instrumentation information about a [NullabilityNodeInfo]. -class NodeInformation { - final String filePath; - - final AstNode astNode; - - final Element element; - - NodeInformation(this.filePath, this.astNode, this.element); - - /// Return detail text for a fix built from an edge with this node as a - /// destination. - String get descriptionForDestination { - // TODO(paulberry): describe AST nodes. - return "A nullable value can't be used here"; - } -} - -/// The instrumentation information gathered from the migration engine that is -/// specific to a single source. -class SourceInformation { - /// A map from the type annotations found in the source code, to the - /// nullability nodes that are associated with that type. - /// - /// TODO(paulberry): we should probably get rid of this data structure. - final Map explicitTypeNullability = {}; - - /// A map from offsets within the source file to a list of changes to be - /// applied at that offset. - Map>? changes; - - /// Initialize a newly created holder of instrumentation information that is - /// specific to a single source. - SourceInformation(); -} diff --git a/pkg/nnbd_migration/lib/src/front_end/instrumentation_listener.dart b/pkg/nnbd_migration/lib/src/front_end/instrumentation_listener.dart deleted file mode 100644 index fe4ae197cc42..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/instrumentation_listener.dart +++ /dev/null @@ -1,84 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:analyzer/dart/element/element.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/src/edit_plan.dart'; -import 'package:nnbd_migration/src/front_end/instrumentation_information.dart'; -import 'package:nnbd_migration/src/front_end/migration_summary.dart'; - -/// A listener used to gather instrumentation information from the migration -/// engine. -class InstrumentationListener implements NullabilityMigrationInstrumentation { - final MigrationSummary? migrationSummary; - - /// The instrumentation information being gathered. - InstrumentationInformation data = InstrumentationInformation(); - - /// Initialize a newly created listener. - InstrumentationListener({this.migrationSummary}); - - @override - void changes(Source source, Map> changes) { - assert(_sourceInfo(source).changes == null); - _sourceInfo(source).changes = changes; - migrationSummary?.recordChanges(source, changes); - } - - @override - void explicitTypeNullability(Source? source, TypeAnnotation typeAnnotation, - NullabilityNodeInfo? node) { - _sourceInfo(source).explicitTypeNullability[typeAnnotation] = node; - } - - @override - void externalDecoratedType( - Element element, DecoratedTypeInfo decoratedType) {} - - @override - void externalDecoratedTypeParameterBound( - TypeParameterElement typeParameter, DecoratedTypeInfo decoratedType) {} - - @override - void finished() { - migrationSummary?.write(); - } - - @override - void graphEdge(EdgeInfo edge, EdgeOriginInfo originInfo) { - data.edgeOrigin[edge] = originInfo; - } - - @override - void immutableNodes(NullabilityNodeInfo never, NullabilityNodeInfo always) { - data.never = never; - data.always = always; - } - - @override - void implicitReturnType( - Source? source, AstNode node, DecoratedTypeInfo? decoratedReturnType) {} - - @override - void implicitType( - Source? source, AstNode? node, DecoratedTypeInfo decoratedType) {} - - @override - void implicitTypeArguments( - Source? source, AstNode node, Iterable types) {} - - @override - void prepareForUpdate() { - for (var source in data.sourceInformation.keys) { - _sourceInfo(source).changes = null; - } - } - - /// Return the source information associated with the given [source], creating - /// it if there has been no previous information for that source. - SourceInformation _sourceInfo(Source? source) => - data.sourceInformation.putIfAbsent(source, () => SourceInformation()); -} diff --git a/pkg/nnbd_migration/lib/src/front_end/instrumentation_renderer.dart b/pkg/nnbd_migration/lib/src/front_end/instrumentation_renderer.dart deleted file mode 100644 index e7eaf6f84dd0..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/instrumentation_renderer.dart +++ /dev/null @@ -1,82 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'dart:io'; - -import 'package:nnbd_migration/src/front_end/migration_info.dart'; -import 'package:nnbd_migration/src/front_end/path_mapper.dart'; -import 'package:nnbd_migration/src/front_end/resources/resources.g.dart' - as resources; -import 'package:path/path.dart' as path; - -String get _dartSdkVersion { - var version = Platform.version; - - // Remove the build date and OS. - if (version.contains(' ')) { - version = version.substring(0, version.indexOf(' ')); - } - - // Convert a git hash to 8 chars. - // '2.8.0-edge.fd992e423ef69ece9f44bd3ac58fa2355b563212' - var versionRegExp = RegExp(r'^.*\.([0-9a-f]+)$'); - var match = versionRegExp.firstMatch(version); - if (match != null && match.group(1)!.length == 40) { - var commit = match.group(1)!; - version = version.replaceAll(commit, commit.substring(0, 10)); - } - - return version; -} - -String substituteVariables(String content, Map variables) { - for (var variable in variables.keys) { - var value = variables[variable]!; - content = content.replaceAll('{{ $variable }}', value); - } - - return content; -} - -/// Instrumentation display output for a library that was migrated to use -/// non-nullable types. -class InstrumentationRenderer { - /// Information for a whole migration, so that libraries can reference each - /// other. - final MigrationInfo? migrationInfo; - - /// Whether the migration has been applied already or not. - final bool hasBeenApplied; - - /// Whether the migration needs to be rerun due to disk changes. - final bool needsRerun; - - /// An object used to map the file paths of analyzed files to the file paths - /// of the HTML files used to view the content of those files. - final PathMapper? pathMapper; - - /// Creates an output object for the given library info. - InstrumentationRenderer(this.migrationInfo, this.pathMapper, - this.hasBeenApplied, this.needsRerun); - - /// Returns the path context used to manipulate paths. - path.Context get pathContext => migrationInfo!.pathContext; - - /// Builds an HTML view of the instrumentation information. - String render() { - var variables = { - 'root': migrationInfo!.includedRoot, - 'dartPageScript': resources.migration_js, - 'dartPageStyle': resources.migration_css, - 'highlightJsPath': migrationInfo!.highlightJsPath, - 'highlightStylePath': migrationInfo!.highlightStylePath, - 'dartLogoPath': migrationInfo!.dartLogoPath, - 'sdkVersion': _dartSdkVersion, - 'migrationAppliedStyle': hasBeenApplied ? 'applied' : 'proposed', - 'needsRerunStyle': needsRerun ? 'needs-rerun' : '', - }; - - return substituteVariables(resources.index_html, variables); - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/migration_info.dart b/pkg/nnbd_migration/lib/src/front_end/migration_info.dart deleted file mode 100644 index 1d10b6ae3bd0..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/migration_info.dart +++ /dev/null @@ -1,378 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer_plugin/protocol/protocol_common.dart'; -import 'package:collection/collection.dart'; -import 'package:crypto/crypto.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; -import 'package:nnbd_migration/src/front_end/offset_mapper.dart'; -import 'package:nnbd_migration/src/front_end/unit_link.dart'; -import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart'; -import 'package:nnbd_migration/src/hint_action.dart'; -import 'package:nnbd_migration/src/preview/preview_site.dart'; -import 'package:path/path.dart' as path; - -/// A description of an edit that can be applied before rerunning the migration -/// in order to improve the migration results. -class EditDetail { - /// A description of the edit that will be performed. - final String description; - - /// The offset of the range to be replaced. - final int offset; - - /// The length of the range to be replaced. - final int length; - - /// The string with which the range will be replaced. - final String replacement; - - /// Initialize a newly created detail. - EditDetail(this.description, this.offset, this.length, this.replacement); - - /// Initializes a detail based on a [SourceEdit] object. - factory EditDetail.fromSourceEdit( - String description, SourceEdit sourceEdit) => - EditDetail(description, sourceEdit.offset, sourceEdit.length, - sourceEdit.replacement); -} - -/// A class storing rendering information for an entire migration report. -/// -/// This generally provides one [InstrumentationRenderer] (for one library) -/// with information about the rest of the libraries represented in the -/// instrumentation output. -class MigrationInfo { - /// The information about the compilation units that are migrated. - final Set? units; - - /// A map from file paths to the unit infos created for those files. The units - /// in this map is a strict superset of the [units] that were migrated. - final Map unitMap; - - /// The resource provider's path context. - final path.Context pathContext; - - /// The filesystem root used to create relative paths for each unit. - final String? includedRoot; - - MigrationInfo(this.units, this.unitMap, this.pathContext, this.includedRoot); - - /// The path of the Dart logo displayed in the toolbar. - String get dartLogoPath => PreviewSite.dartLogoPath; - - /// The path to the highlight.pack.js script, relative to [unitInfo]. - String get highlightJsPath => PreviewSite.highlightJsPath; - - /// The path to the highlight.pack.js stylesheet, relative to [unitInfo]. - String get highlightStylePath => PreviewSite.highlightCssPath; - - /// The path of the Material icons font. - String get materialIconsPath => PreviewSite.materialIconsPath; - - /// The path of the Roboto font. - String get robotoFont => PreviewSite.robotoFontPath; - - /// The path of the Roboto Mono font. - String get robotoMonoFont => PreviewSite.robotoMonoFontPath; - - /// Returns the absolute path of [path], as relative to [includedRoot]. - String absolutePathFromRoot(String? path) => - pathContext.join(includedRoot!, path); - - /// Return the path to [unit] from [includedRoot], to be used as a display - /// name for a library. - String computeName(UnitInfo unit) => relativePathFromRoot(unit.path!); - - /// Returns the relative path of [path] from [includedRoot]. - String relativePathFromRoot(String path) => - pathContext.relative(path, from: includedRoot); - - List unitLinks() { - var links = []; - for (var unit in units!) { - var count = unit.fixRegions.length; - links.add(UnitLink( - unit.path, - pathContext.split(computeName(unit)), - count, - unit.wasExplicitlyOptedOut, - unit.migrationStatus, - unit.migrationStatusCanBeChanged)); - } - return links; - } -} - -/// A location from or to which a user might want to navigate. -abstract class NavigationRegion { - /// The offset of the region. - final int offset; - - /// The line number of the region. - final int? line; - - /// The length of the region. - final int length; - - /// Initialize a newly created link. - NavigationRegion(int offset, this.line, this.length) - : assert(offset >= 0), - offset = offset < 0 ? 0 : offset; -} - -/// A location from which a user might want to navigate. -class NavigationSource extends NavigationRegion { - /// The target to which the user should be navigated. - final NavigationTarget target; - - /// Initialize a newly created link. - NavigationSource(super.offset, super.line, super.length, this.target); -} - -/// A location to which a user might want to navigate. -class NavigationTarget extends NavigationRegion { - /// The file containing the anchor. - final String filePath; - - /// Initialize a newly created anchor. - NavigationTarget(this.filePath, int offset, int? line, int length) - : super(offset, line, length); - - @override - int get hashCode => Object.hash(filePath, offset, length); - - @override - bool operator ==(Object other) { - return other is NavigationTarget && - other.filePath == filePath && - other.offset == offset && - other.length == length; - } - - @override - String toString() => 'NavigationTarget["$filePath", $line, $offset, $length]'; -} - -/// A description of an explanation associated with a region of code that was -/// modified. -class RegionInfo { - /// Type type of region. - final RegionType regionType; - - /// The offset to the beginning of the region. - final int offset; - - /// The length of the region. - final int length; - - /// The line number of the beginning of the region. - final int lineNumber; - - /// The explanation to be displayed for the region. - /// - /// `null` if this region doesn't represent a fix (e.g. it's just whitespace - /// change to preserve formatting). - final String? explanation; - - /// The kind of fix that was applied. - /// - /// `null` if this region doesn't represent a fix (e.g. it's just whitespace - /// change to preserve formatting). - final NullabilityFixKind? kind; - - /// Indicates whether this region should be counted in the edit summary. - final bool isCounted; - - /// A list of the edits that are related to this range. - List edits; - - /// A list of the nullability propagation traces that are related to this - /// range. - List traces; - - /// Initialize a newly created region. - RegionInfo(this.regionType, this.offset, this.length, this.lineNumber, - this.explanation, this.kind, this.isCounted, - {this.edits = const [], this.traces = const []}); -} - -/// Different types of regions that are called out. -enum RegionType { - /// This is a region of code that was added in migration. - add, - - /// This is a region of code that was removed in migration. - remove, - - /// This is a region of code that wasn't changed by migration, but is being - /// shown to give the user more information about the migration. - informative, -} - -/// Information about a single entry in a nullability trace. -class TraceEntryInfo { - /// Text description of the entry. - final String description; - - /// Name of the enclosing function, or `null` if not known. - String? function; - - /// Source code location associated with the entry, or `null` if no source - /// code location is known. - final NavigationTarget? target; - - /// The hint actions available on this trace entry, or `[]` if none. - final List hintActions; - - TraceEntryInfo(this.description, this.function, this.target, - {this.hintActions = const []}); -} - -/// Information about a nullability trace. -class TraceInfo { - /// Text description of the trace. - final String description; - - /// List of trace entries. - final List entries; - - TraceInfo(this.description, this.entries); -} - -/// The migration information associated with a single compilation unit. -class UnitInfo { - /// The absolute and normalized path of the unit. - final String? path; - - /// Hash of the original contents of the unit. - List? _diskContentHash; - - /// The preview content of unit. - String? content; - - /// The information about the regions that have an explanation associated with - /// them. The offsets in these regions are offsets into the post-edit content. - final List regions = []; - - /// The navigation sources that are located in this file. The offsets in these - /// sources are offsets into the pre-edit content. - List? sources; - - /// The navigation targets that are located in this file. The offsets in these - /// targets are offsets into the pre-edit content. - final Set targets = {}; - - /// An offset mapper reflecting changes made by the migration edits. - OffsetMapper migrationOffsetMapper = OffsetMapper.identity; - - /// An offset mapper reflecting changes made to disk since the migration was - /// run, which can be rebased on [migrationOffsetMapper] to create and - /// maintain an offset mapper from current disk state to migration result. - OffsetMapper diskChangesOffsetMapper = OffsetMapper.identity; - - /// Whether this compilation unit was explicitly opted out of null safety at - /// the start of this migration. - late bool wasExplicitlyOptedOut; - - late bool migrationStatusCanBeChanged; - - /// Indicates the migration status of this unit. - /// - /// After all migration phases have completed, this indicates that a file was - /// already migrated, or is being migrated during this migration. - /// - /// A user can change this migration status from the preview interface: - /// * An already migrated unit cannot be changed. - /// * During an initial migration, in which a package is migrated to null - /// safety, the user can toggle a file's migration status between - /// "migrating" and "opting out." - /// * During a follow-up migration, in which a package has been migrated to - /// null safety, but some files have been opted out, the user can toggle a - /// file's migration status between "migrating" and "keeping opted out." - UnitMigrationStatus? migrationStatus; - - /// Initialize a newly created unit. - UnitInfo(this.path); - - /// Set the original/disk content of this file to later use [hadDiskContent]. - /// This does not have a getter because it is backed by a private hash. - set diskContent(String? originalContent) { - _diskContentHash = md5.convert((originalContent ?? '').codeUnits).bytes; - } - - /// Returns the [regions] that represent a fixed (changed) region of code. - List get fixRegions => regions - .where((region) => - region.regionType != RegionType.informative && region.kind != null) - .toList(); - - /// Returns the [regions] that are informative. - List get informativeRegions => regions - .where((region) => - region.regionType == RegionType.informative && region.kind != null) - .toList(); - - /// The object used to map the pre-edit offsets in the navigation targets to - /// the post-edit offsets in the [content]. - OffsetMapper get offsetMapper => - OffsetMapper.rebase(diskChangesOffsetMapper, migrationOffsetMapper); - - /// Check if this unit's file had expected disk contents [checkContent]. - bool hadDiskContent(String? checkContent) { - assert(_diskContentHash != null); - return const ListEquality().equals( - _diskContentHash, md5.convert((checkContent ?? '').codeUnits).bytes); - } - - void handleSourceEdit(SourceEdit sourceEdit) { - final contentCopy = content; - final regionsCopy = List.from(regions); - final insertLength = sourceEdit.replacement.length; - final deleteLength = sourceEdit.length; - final migratedOffset = offsetMapper.map(sourceEdit.offset); - final diskOffset = diskChangesOffsetMapper.map(sourceEdit.offset); - if (migratedOffset == null || diskOffset == null) { - throw StateError('cannot apply replacement, offset has been deleted.'); - } - try { - content = content!.replaceRange(migratedOffset, - migratedOffset + deleteLength, sourceEdit.replacement); - regions.clear(); - regions.addAll(regionsCopy - .where((region) => region.offset + region.length <= migratedOffset)); - regions.addAll(regionsCopy - .where((region) => region.offset >= migratedOffset + deleteLength) - .map((region) => RegionInfo( - region.regionType, - // TODO: perhaps this should be handled by offset mapper instead, - // since offset mapper handles navigation, edits, and traces, and - // this is the odd ball out. - region.offset + insertLength - deleteLength, - region.length, - region.lineNumber, - region.explanation, - region.kind, - region.isCounted, - edits: region.edits, - traces: region.traces))); - - diskChangesOffsetMapper = OffsetMapper.sequence( - diskChangesOffsetMapper, - OffsetMapper.forReplacement( - diskOffset, deleteLength, sourceEdit.replacement)); - } catch (e) { - regions.clear(); - regions.addAll(regionsCopy); - content = contentCopy; - rethrow; - } - } - - /// Returns the [RegionInfo] at offset [offset]. - // TODO(srawlins): This is O(n), used each time the user clicks on a region. - // Consider changing the type of [regions] to facilitate O(1) searching. - RegionInfo regionAt(int offset) => regions - .firstWhere((region) => region.kind != null && region.offset == offset); -} diff --git a/pkg/nnbd_migration/lib/src/front_end/migration_state.dart b/pkg/nnbd_migration/lib/src/front_end/migration_state.dart deleted file mode 100644 index 033550b88c21..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/migration_state.dart +++ /dev/null @@ -1,98 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:cli_util/cli_logging.dart'; -import 'package:nnbd_migration/instrumentation.dart'; -import 'package:nnbd_migration/migration_cli.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; -import 'package:nnbd_migration/src/front_end/dartfix_listener.dart'; -import 'package:nnbd_migration/src/front_end/info_builder.dart'; -import 'package:nnbd_migration/src/front_end/instrumentation_listener.dart'; -import 'package:nnbd_migration/src/front_end/migration_info.dart'; -import 'package:nnbd_migration/src/front_end/path_mapper.dart'; -import 'package:pub_semver/src/version.dart'; - -/// The state of an NNBD migration. -class MigrationState { - bool _hasBeenApplied = false; - - /// The migration associated with the state. - final NullabilityMigration? migration; - - /// The root directory that contains all of the files that were migrated. - final String? includedRoot; - - /// The mapper user to give nodes ids. - final NodeMapper nodeMapper = SimpleNodeMapper(); - - /// The listener used to collect fixes. - final DartFixListener? listener; - - /// The listener that collected information during the migration. - final InstrumentationListener? instrumentationListener; - - /// The information that was built from the rest of the migration state. - MigrationInfo? migrationInfo; - - /// The object used to map paths. - PathMapper? pathMapper; - - /// If there have been changes to disk so the migration needs to be rerun. - bool needsRerun = false; - - final AnalysisResult? analysisResult; - - late List? previewUrls; - - /// Map of additional package dependencies that will be required by the - /// migrated code. Keys are package names; values indicate the minimum - /// required version of each package. - final Map neededPackages; - - /// A function which returns whether a file at a given path should be - /// migrated. - final bool Function(String?) shouldBeMigratedFunction; - - /// Initialize a newly created migration state with the given values. - MigrationState( - this.migration, - this.includedRoot, - this.listener, - this.instrumentationListener, - this.neededPackages, - this.shouldBeMigratedFunction, - [this.analysisResult]); - - /// If the migration has been applied to disk. - bool get hasBeenApplied => _hasBeenApplied; - - bool get hasErrors => analysisResult?.hasErrors ?? false; - - /// Mark that the migration has been applied to disk. - void markApplied() { - assert(!hasBeenApplied); - _hasBeenApplied = true; - } - - /// Refresh the state of the migration after the migration has been updated. - Future refresh(Logger logger, Iterable? pathsToProcess) async { - assert(!hasBeenApplied); - var provider = listener!.server!.resourceProvider; - var infoBuilder = InfoBuilder( - provider, - includedRoot, - instrumentationListener!.data, - listener, - migration, - nodeMapper, - logger, - shouldBeMigratedFunction, - pathsToProcess); - var unitInfos = await infoBuilder.explainMigration(); - var pathContext = provider.pathContext; - migrationInfo = MigrationInfo( - unitInfos, infoBuilder.unitMap, pathContext, includedRoot); - pathMapper = PathMapper(provider); - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/migration_summary.dart b/pkg/nnbd_migration/lib/src/front_end/migration_summary.dart deleted file mode 100644 index 2cfcecd779c9..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/migration_summary.dart +++ /dev/null @@ -1,119 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'dart:convert'; - -import 'package:analyzer/file_system/file_system.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; -import 'package:nnbd_migration/src/edit_plan.dart'; - -/// Class with the capability of writing out a machine-readable summary of -/// migration results. -class MigrationSummary { - /// Path to which the summary should be written. - final String? summaryPath; - - final ResourceProvider resourceProvider; - - /// Path to the package being migrated. Entries in the summary will refer to - /// files relative to this root. - final String rootPath; - - /// Map from relative file path to a map from fix name to count. - final Map> _changesByRelativePath = {}; - - MigrationSummary(this.summaryPath, this.resourceProvider, this.rootPath); - - /// Records information about the [changes] made to a [source] file. - void recordChanges(Source source, Map> changes) { - var changeSummary = {}; - var hintsSeen = {}; - for (var entry in changes.entries) { - for (var edit in entry.value) { - var info = edit.info; - if (info != null) { - var hint = info.hintComment; - if (hint == null || hintsSeen.add(hint)) { - var description = info.description; - var key = _keyForKind(description.kind); - changeSummary[key] = (changeSummary[key] ?? 0) + 1; - } - } - } - } - _changesByRelativePath[resourceProvider.pathContext - .relative(source.fullName, from: rootPath)] = changeSummary; - } - - /// Writes out the summary data accumulated so far - void write() { - resourceProvider.getFile(summaryPath!).writeAsStringSync(jsonEncode({ - 'changes': {'byPath': _changesByRelativePath} - })); - } - - String _keyForKind(NullabilityFixKind kind) { - switch (kind) { - case NullabilityFixKind.addThen: - return 'addThen'; - case NullabilityFixKind.addImport: - return 'addImport'; - case NullabilityFixKind.addLate: - return 'addLate'; - case NullabilityFixKind.addLateDueToHint: - return 'addLateDueToHint'; - case NullabilityFixKind.addLateDueToTestSetup: - return 'addLateDueToTestSetup'; - case NullabilityFixKind.addLateFinalDueToHint: - return 'addLateFinalDueToHint'; - case NullabilityFixKind.addRequired: - return 'addRequired'; - case NullabilityFixKind.addType: - return 'addType'; - case NullabilityFixKind.changeMethodName: - return 'changeMethodName'; - case NullabilityFixKind.checkExpression: - return 'checkExpression'; - case NullabilityFixKind.checkExpressionDueToHint: - return 'checkExpressionDueToHint'; - case NullabilityFixKind.compoundAssignmentHasNullableSource: - return 'compoundAssignmentHasNullableSource'; - case NullabilityFixKind.compoundAssignmentHasBadCombinedType: - return 'compoundAssignmentHasBadCombinedType'; - case NullabilityFixKind.conditionFalseInStrongMode: - return 'conditionFalseInStrongMode'; - case NullabilityFixKind.conditionTrueInStrongMode: - return 'conditionTrueInStrongMode'; - case NullabilityFixKind.downcastExpression: - return 'downcastExpression'; - case NullabilityFixKind.makeTypeNullable: - return 'makeTypeNullable'; - case NullabilityFixKind.makeTypeNullableDueToHint: - return 'makeTypeNullableDueToHint'; - case NullabilityFixKind.noValidMigrationForNull: - return 'noValidMigrationForNull'; - case NullabilityFixKind.nullAwarenessUnnecessaryInStrongMode: - return 'nullAwarenessUnnecessaryInStrongMode'; - case NullabilityFixKind.nullAwareAssignmentUnnecessaryInStrongMode: - return 'nullAwareAssignmentUnnecessaryInStrongMode'; - case NullabilityFixKind.otherCastExpression: - return 'otherCastExpression'; - case NullabilityFixKind.removeAs: - return 'removeAs'; - case NullabilityFixKind.removeDeadCode: - return 'removeDeadCode'; - case NullabilityFixKind.removeLanguageVersionComment: - return 'removeLanguageVersionComment'; - case NullabilityFixKind.replaceVar: - return 'replaceVar'; - case NullabilityFixKind.typeNotMadeNullable: - return 'typeNotMadeNullable'; - case NullabilityFixKind.typeNotMadeNullableDueToHint: - return 'typeNotMadeNullableDueToHint'; - case NullabilityFixKind.removeNullableAnnotation: - return 'removeNullableAnnotation'; - } - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/navigation_tree_renderer.dart b/pkg/nnbd_migration/lib/src/front_end/navigation_tree_renderer.dart deleted file mode 100644 index a733aed7b70e..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/navigation_tree_renderer.dart +++ /dev/null @@ -1,75 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:nnbd_migration/src/front_end/migration_info.dart'; -import 'package:nnbd_migration/src/front_end/path_mapper.dart'; -import 'package:nnbd_migration/src/front_end/unit_link.dart'; -import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart'; -import 'package:path/path.dart' as path; - -/// Groups the items in [iterable] by the result of applying [groupFn] to each -/// item. -Map> _groupBy( - Iterable iterable, K Function(T item) groupFn) { - var result = >{}; - for (var item in iterable) { - var key = groupFn(item); - result.putIfAbsent(key, () => []).add(item); - } - return result; -} - -/// The HTML that is displayed for a region of code. -class NavigationTreeRenderer { - final MigrationInfo? migrationInfo; - - /// An object used to map the file paths of analyzed files to the file paths - /// of the HTML files used to view the content of those files. - final PathMapper? pathMapper; - - /// Initializes a newly created region page within the given [site]. The - /// [unitInfo] provides the information needed to render the page. - NavigationTreeRenderer(this.migrationInfo, this.pathMapper); - - /// Returns the path context used to manipulate paths. - path.Context get pathContext => migrationInfo!.pathContext; - - /// Renders the navigation link tree. - List render() { - var linkData = migrationInfo!.unitLinks(); - var tree = _renderNavigationSubtree(linkData, 0); - for (var node in tree) { - node.parent = null; - } - return tree; - } - - /// Renders the navigation link subtree at [depth]. - List _renderNavigationSubtree( - List links, int depth) { - var linksGroupedByDirectory = _groupBy( - links.where((link) => link.depth > depth), - (UnitLink link) => link.pathParts[depth]); - - return [ - for (var entry in linksGroupedByDirectory.entries) - NavigationTreeDirectoryNode( - name: entry.key, - path: pathContext - .dirname(pathContext.joinAll(entry.value.first.pathParts)), - subtree: _renderNavigationSubtree(entry.value, depth + 1), - )..setSubtreeParents(), - for (var link in links.where((link) => link.depth == depth)) - NavigationTreeFileNode( - name: link.fileName, - path: pathContext.joinAll(link.pathParts), - href: pathMapper!.map(link.fullPath!), - editCount: link.editCount, - wasExplicitlyOptedOut: link.wasExplicitlyOptedOut, - migrationStatus: link.migrationStatus, - migrationStatusCanBeChanged: link.migrationStatusCanBeChanged, - ), - ]; - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/non_nullable_fix.dart b/pkg/nnbd_migration/lib/src/front_end/non_nullable_fix.dart deleted file mode 100644 index 92e2c782adc8..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/non_nullable_fix.dart +++ /dev/null @@ -1,626 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'dart:async'; -import 'dart:convert' show jsonDecode, JsonEncoder; - -import 'package:analyzer/dart/analysis/features.dart'; -import 'package:analyzer/dart/analysis/results.dart'; -import 'package:analyzer/dart/ast/ast.dart'; -import 'package:analyzer/file_system/file_system.dart'; -import 'package:analyzer/source/source.dart'; -import 'package:analyzer_plugin/protocol/protocol_common.dart'; -import 'package:cli_util/cli_logging.dart'; -import 'package:meta/meta.dart'; -import 'package:nnbd_migration/nnbd_migration.dart'; -import 'package:nnbd_migration/src/front_end/charcodes.dart'; -import 'package:nnbd_migration/src/front_end/dartfix_listener.dart'; -import 'package:nnbd_migration/src/front_end/instrumentation_listener.dart'; -import 'package:nnbd_migration/src/front_end/migration_state.dart'; -import 'package:nnbd_migration/src/front_end/migration_summary.dart'; -import 'package:nnbd_migration/src/preview/http_preview_server.dart'; -import 'package:nnbd_migration/src/utilities/json.dart' as json; -import 'package:pub_semver/pub_semver.dart'; -import 'package:source_span/source_span.dart'; -import 'package:yaml/yaml.dart'; - -/// [NonNullableFix] visits each named type in a resolved compilation unit -/// and determines whether the associated variable or parameter can be null -/// then adds or removes a '?' trailing the named type as appropriate. -class NonNullableFix { - static final List _allServers = []; - - final Version _intendedMinimumSdkVersion; - - /// The internet address the server should bind to. Should be suitable for - /// passing to HttpServer.bind, i.e. either a [String] or an - /// [InternetAddress]. - final Object? bindAddress; - - final Logger _logger; - - final int? preferredPort; - - final DartFixListener listener; - - /// The root of the included paths. - /// - /// The included paths may contain absolute and relative paths, non-canonical - /// paths, and directory and file paths. The "root" is the deepest directory - /// which all included paths share. - final String includedRoot; - - /// If non-null, the path to which a machine-readable summary of migration - /// results should be written. - final String? summaryPath; - - final ResourceProvider resourceProvider; - - /// The HTTP server that serves the preview tool. - HttpPreviewServer? _server; - - String? authToken; - - InstrumentationListener? instrumentationListener; - - NullabilityMigrationAdapter? adapter; - - NullabilityMigration? migration; - - late Future Function() rerunFunction; - - /// A list of the URLs corresponding to the included roots. - List? previewUrls; - - /// A function which returns whether a file at a given path should be - /// migrated. - final bool Function(String?) shouldBeMigratedFunction; - - /// The set of files which are being considered for migration. - Iterable? pathsToProcess; - - /// Completes when the server has been shutdown. - late Completer serverIsShutdown; - - NonNullableFix(this.listener, this.resourceProvider, this.bindAddress, - this._logger, this.shouldBeMigratedFunction, - {List included = const [], - this.preferredPort, - this.summaryPath, - required String sdkPath}) - : includedRoot = - _getIncludedRoot(included, listener.server!.resourceProvider), - _intendedMinimumSdkVersion = - _computeIntendedMinimumSdkVersion(resourceProvider, sdkPath) { - reset(); - } - - bool get isPreviewServerRunning => _server != null; - - /// In the package_config.json file, the patch number is omitted. - String get _intendedLanguageVersion => - '${_intendedMinimumSdkVersion.major}.${_intendedMinimumSdkVersion.minor}'; - - String get _intendedSdkVersionConstraint => - '>=$_intendedMinimumSdkVersion <3.0.0'; - - InstrumentationListener createInstrumentationListener( - {MigrationSummary? migrationSummary}) => - InstrumentationListener(migrationSummary: migrationSummary); - - Future finalizeUnit(ResolvedUnitResult result) async { - migration!.finalizeInput(result); - } - - Future finish() async { - var neededPackages = migration!.finish(); - final state = MigrationState(migration, includedRoot, listener, - instrumentationListener, neededPackages, shouldBeMigratedFunction); - await state.refresh(_logger, pathsToProcess); - return state; - } - - Future prepareUnit(ResolvedUnitResult result) async { - migration!.prepareInput(result); - } - - /// Processes the non-source files of the package rooted at [pkgFolder]. - /// - /// This means updating the pubspec.yaml file, the package_config.json - /// file, and the analysis_options.yaml file, each only if necessary. - /// - /// [neededPackages] is a map whose keys are the names of packages that should - /// be depended upon by the package's pubspec, and whose values are the - /// minimum required versions of those packages. - void processPackage(Folder pkgFolder, Map neededPackages) { - var pubspecFile = pkgFolder.getChildAssumingFile('pubspec.yaml'); - if (!pubspecFile.exists) { - // If the pubspec file cannot be found, we do not attempt to change the - // Package Config file, nor the analysis options file. - return; - } - - _YamlFile pubspec; - try { - pubspec = _YamlFile._parseFrom(pubspecFile); - } on FileSystemException catch (e) { - _processPubspecException('read', pubspecFile.path, e); - return; - } on FormatException catch (e) { - _processPubspecException('parse', pubspecFile.path, e); - return; - } - - var updated = _processPubspec(pubspec, neededPackages); - if (updated) { - _processConfigFile(pkgFolder, pubspec); - } - } - - Future processUnit(ResolvedUnitResult result) async { - migration!.processInput(result); - } - - Future rerun() async { - reset(); - var state = await rerunFunction(); - return state; - } - - void reset() { - instrumentationListener = createInstrumentationListener( - migrationSummary: summaryPath == null - ? null - : MigrationSummary(summaryPath, resourceProvider, includedRoot)); - adapter = NullabilityMigrationAdapter(listener); - migration = NullabilityMigration(adapter, - permissive: true, instrumentation: instrumentationListener); - } - - void shutdownServer() { - if (_server != null) { - _server!.close(); - _server = null; - serverIsShutdown.complete(); - } - } - - Future startPreviewServer( - MigrationState state, void Function() applyHook) async { - // This method may be called multiple times, for example during a re-run. - // But the preview server should only be started once. - if (_server == null) { - void wrappedApplyHookWithShutdown() { - shutdownServer(); - applyHook(); - } - - _server = HttpPreviewServer(state, rerun, wrappedApplyHookWithShutdown, - bindAddress, preferredPort, _logger); - _server!.serveHttp(); - _allServers.add(_server); - var serverHostname = await _server!.boundHostname; - var serverPort = await _server!.boundPort; - authToken = await _server!.authToken; - serverIsShutdown = Completer(); - - previewUrls = [ - // TODO(jcollins-g): Change protocol to only return a single string. - Uri( - scheme: 'http', - host: serverHostname, - port: serverPort, - path: state.pathMapper!.map(includedRoot), - queryParameters: {'authToken': authToken}).toString() - ]; - } - } - - /// Updates the Package Config file to specify a minimum Dart SDK version - /// which supports null safety. - void _processConfigFile(Folder pkgFolder, _YamlFile pubspec) { - var packageName = pubspec._getName(); - if (packageName == null) { - return; - } - - var packageConfigFile = pkgFolder - .getChildAssumingFolder('.dart_tool') - .getChildAssumingFile('package_config.json'); - - if (!packageConfigFile.exists) { - _processPackageConfigException( - 'Warning: Could not find the package configuration file.', - packageConfigFile.path); - return; - } - try { - var configText = packageConfigFile.readAsStringSync(); - var configMap = json.expectType(jsonDecode(configText), 'root'); - json.expectKey(configMap, 'configVersion'); - var configVersion = - json.expectType(configMap['configVersion'], 'configVersion'); - if (configVersion != 2) { - _processPackageConfigException( - 'Warning: Unexpected package configuration file version ' - '$configVersion (expected version 2). Cannot update this file.', - packageConfigFile.path); - return; - } - json.expectKey(configMap, 'packages'); - var packagesList = - json.expectType(configMap['packages'], 'packages'); - for (var package in packagesList) { - var packageMap = json.expectType(package, 'package'); - json.expectKey(packageMap, 'name'); - var name = json.expectType(packageMap['name'], 'name'); - if (name != packageName) { - continue; - } - json.expectKey(packageMap, 'languageVersion'); - packageMap['languageVersion'] = _intendedLanguageVersion; - // Pub appears to always use a two-space indent. This will minimize the - // diff between the previous text and the new text. - var newText = '${JsonEncoder.withIndent(' ').convert(configMap)}\n'; - - // TODO(srawlins): This is inelegant. We add an "edit" which replaces - // the entire content of the package config file with new content, while - // it is likely that only 1 character has changed. I do not know of a - // JSON parser that yields SourceSpans, so that I may know the proper - // index. One idea, another hack, would be to write a magic string in - // place of the version number, encode to JSON, and find the index of - // the magic string. - var line = 0; - var offset = 0; - var edit = SourceEdit(offset, configText.length, newText); - listener.addSourceFileEdit( - 'enable Null Safety language feature', - Location(packageConfigFile.path, offset, newText.length, line, 0, - endLine: 0, endColumn: 0), - SourceFileEdit(packageConfigFile.path, 0, edits: [edit])); - } - } on FormatException catch (e) { - _processPackageConfigException( - 'Warning: Encountered an error parsing the package configuration ' - 'file: $e\n\nCannot update this file.', - packageConfigFile.path); - } - } - - void _processPackageConfigException(String prefix, String packageConfigPath, - [Object error = '']) { - // TODO(#42138): This should use [listener.addRecommendation] when that - // function is implemented. - print('''$prefix - $packageConfigPath - $error - - Be sure to run `pub get` before examining the results of the migration. -'''); - } - - /// Updates the pubspec.yaml file to specify a minimum Dart SDK version which - /// supports null safety. - /// - /// Return value indicates whether the user's `package_config.json` file - /// should be updated. - bool _processPubspec(_YamlFile pubspec, Map neededPackages) { - bool packageConfigNeedsUpdate = false; - bool packageDepsUpdated = false; - var pubspecMap = pubspec.content; - YamlNode? environmentOptions; - if (pubspecMap is YamlMap) { - environmentOptions = pubspecMap.nodes['environment']; - } - if (environmentOptions == null) { - var start = SourceLocation(0, line: 0, column: 0); - var content = ''' -environment: - sdk: '$_intendedSdkVersionConstraint' -'''; - pubspec._insertAfterParent( - SourceSpan(start, start, ''), content, listener); - packageConfigNeedsUpdate = true; - } else if (environmentOptions is YamlMap) { - if (_updatePubspecConstraint(pubspec, environmentOptions, 'sdk', - "'$_intendedSdkVersionConstraint'", _intendedMinimumSdkVersion)) { - packageConfigNeedsUpdate = true; - } - } else { - // Odd malformed pubspec. Leave it alone, but go ahead and update the - // package_config.json file. - packageConfigNeedsUpdate = true; - } - if (neededPackages.isNotEmpty) { - YamlNode? dependencies; - if (pubspecMap is YamlMap) { - dependencies = pubspecMap.nodes['dependencies']; - } - if (dependencies == null) { - var depLines = [ - for (var entry in neededPackages.entries) - ' ${entry.key}: ^${entry.value}' - ]; - var start = SourceLocation(0, line: 0, column: 0); - var content = ''' -dependencies: -${depLines.join('\n')} -'''; - pubspec._insertAfterParent( - SourceSpan(start, start, ''), content, listener); - packageDepsUpdated = true; - } else if (dependencies is YamlMap) { - for (var neededPackage in neededPackages.entries) { - if (_updatePubspecConstraint(pubspec, dependencies, neededPackage.key, - '^${neededPackage.value}', neededPackage.value)) { - packageDepsUpdated = true; - } - } - } - } - if (packageDepsUpdated) { - listener.reportPubGetNeeded(neededPackages); - } - - return packageConfigNeedsUpdate; - } - - void _processPubspecException(String action, String pubspecPath, error) { - listener.client.onFatalError('''Failed to $action pubspec file - $pubspecPath - $error - - Manually update this file to enable the Null Safety language feature by - adding: - - environment: - sdk: '$_intendedSdkVersionConstraint'; -'''); - throw StateError('listener.reportFatalError should never return'); - } - - /// Updates a constraint in the given [pubspec] file. If [key] is found in - /// [map], and the corresponding value does has a minimum less than - /// [minimumVersion], it is updated to [fullVersionConstraint]. If it is not - /// found, then an entry is added. - /// - /// Return value indicates whether a change was made. - bool _updatePubspecConstraint(_YamlFile pubspec, YamlMap map, String key, - String fullVersionConstraint, Version minimumVersion) { - var node = map.nodes[key]; - if (node == null) { - var content = ''' - - $key: $fullVersionConstraint'''; - pubspec._insertAfterParent(map.span, content, listener); - return true; - } else if (node is YamlScalar) { - VersionConstraint currentConstraint; - if (node.value is String) { - currentConstraint = VersionConstraint.parse(node.value as String); - var invalidVersionMessage = - 'The current SDK constraint in pubspec.yaml is invalid. A ' - 'minimum version, such as ">=2.7.0", is required when launching ' - "'dart migrate'."; - if (currentConstraint is Version) { - // In this case, the constraint is an exact version, like 2.0.0. - _logger.stderr(invalidVersionMessage); - return false; - } else if (currentConstraint is VersionRange) { - if (currentConstraint.min == null) { - _logger.stderr(invalidVersionMessage); - return false; - } else if (currentConstraint.min! >= minimumVersion) { - // The current version constraint is already up to date. Do not - // edit. - return false; - } else { - // TODO(srawlins): This overwrites the current maximum version. In - // the uncommon situation that there is a special maximum, it should - // not. - pubspec._replaceSpan(node.span, fullVersionConstraint, listener); - return true; - } - } else { - // The constraint is something different, like a union, like - // '>=1.0.0 <2.0.0 >=3.0.0 <4.0.0', which is not valid. - _logger.stderr(invalidVersionMessage); - return false; - } - } else { - // Something is odd with the constraint we've found in pubspec.yaml; - // Best to leave it alone. - return false; - } - } else { - // Something is odd with the format of pubspec.yaml; best to leave it - // alone. - return false; - } - } - - /// Allows unit tests to shut down any rogue servers that have been started, - /// so that unit testing can complete. - @visibleForTesting - static void shutdownAllServers() { - for (var server in _allServers) { - try { - server!.close(); - } catch (_) {} - } - _allServers.clear(); - } - - static Version _computeIntendedMinimumSdkVersion( - ResourceProvider resourceProvider, String sdkPath) { - var versionFile = resourceProvider - .getFile(resourceProvider.pathContext.join(sdkPath, 'version')); - if (!versionFile.exists) { - throw StateError( - 'Could not find SDK version file at ${versionFile.path}'); - } - var sdkVersionString = versionFile.readAsStringSync().trim(); - var sdkVersion = Version.parse(sdkVersionString); - // Ideally, we would like to set the user's minimum SDK constraint to the - // version in which null safety was released to stable. But we only want to - // do so if we are sure that stable release exists. An easy way to check - // that is to see if the current SDK version is greater than or equal to the - // stable release of null safety. - var nullSafetyStableReleaseVersion = Feature.non_nullable.releaseVersion!; - if (sdkVersion >= nullSafetyStableReleaseVersion) { - // It is, so we can use it as the minimum SDK constraint. - return nullSafetyStableReleaseVersion; - } else { - // It isn't. This either means that null safety hasn't been released to - // stable yet (in which case it's definitely not safe to use - // `nullSafetyStableReleaseVersion` as a minimum SDK constraint), or it - // has been released but the user hasn't upgraded to it (in which case we - // don't want to use it as a minimum SDK constraint anyway, because we - // don't want to force the user to upgrade their SDK in order to be able - // to use their own package). Our next best option is to use the user's - // current SDK version as a minimum SDK constraint, assuming it's a proper - // beta release version. - if (sdkVersionString.contains('beta')) { - // It is, so we can use it. - return sdkVersion; - } else { - // It isn't. The user is probably either on a bleeding edge version of - // the SDK (e.g. `2.12.0-edge.`), a dev version - // (e.g. `2.12.0-X.Y.dev`), or an internally built version - // (e.g. `2.12.0-`). All of these version numbers are - // unsafe for the user to use as their minimum SDK constraint, because - // if they published their package, it wouldn't be usable with the - // latest beta release. So just fall back on using a version of - // `-0`. - return Version.parse('$nullSafetyStableReleaseVersion-0'); - } - } - } - - /// Get the "root" of all [included] paths. See [includedRoot] for its - /// definition. - static String _getIncludedRoot( - List included, ResourceProvider provider) { - var context = provider.pathContext; - // This step looks like it may be expensive (`getResource`, splitting up - // all of the paths, comparing parts, joining one path back together). In - // practice, this should be cheap because typically only one path is given - // to dartfix. - var rootParts = included - .map((p) => context.normalize(context.absolute(p))) - .map((p) => provider.getResource(p) is File ? context.dirname(p) : p) - .map((p) => context.split(p)) - .reduce((value, parts) { - var shorterPath = value.length < parts.length ? value : parts; - var length = shorterPath.length; - for (var i = 0; i < length; i++) { - if (value[i] != parts[i]) { - // [value] and [parts] are the same, only up to part [i]. - return value.sublist(0, i); - } - } - // [value] and [parts] are the same up to the full length of the shorter - // of the two, so just return that. - return shorterPath; - }); - return context.joinAll(rootParts); - } -} - -class NullabilityMigrationAdapter implements NullabilityMigrationListener { - final DartFixListener listener; - - NullabilityMigrationAdapter(this.listener); - - @override - void addEdit(Source source, SourceEdit edit) { - listener.addEditWithoutSuggestion(source, edit); - } - - @override - void addSuggestion(String descriptions, Location location) { - listener.addSuggestion(descriptions, location); - } - - @override - void reportException( - Source? source, AstNode? node, Object exception, StackTrace stackTrace) { - listener.client.onException(''' -$exception at offset ${node!.offset} in $source ($node) - -$stackTrace'''); - } -} - -class _YamlFile { - final String path; - final String textContent; - - final YamlNode content; - - _YamlFile._(this.path, this.textContent, this.content); - - String? _getName() { - YamlNode? packageNameNode; - - if (content is YamlMap) { - packageNameNode = (content as YamlMap).nodes['name']; - } else { - return null; - } - - if (packageNameNode is YamlScalar && packageNameNode.value is String) { - return packageNameNode.value as String?; - } else { - return null; - } - } - - /// Inserts [content] into this file, immediately after [parentSpan]. - void _insertAfterParent( - SourceSpan parentSpan, String content, DartFixListener listener) { - var line = parentSpan.end.line; - var offset = parentSpan.end.offset; - // Walk [offset] and [line] back to the first non-whitespace character - // before [offset]. - while (offset > 0) { - var ch = textContent.codeUnitAt(offset - 1); - if (ch == $space || ch == $cr) { - --offset; - } else if (ch == $lf) { - --offset; - --line; - } else { - break; - } - } - var edit = SourceEdit(offset, 0, content); - listener.addSourceFileEdit( - 'enable Null Safety language feature', - Location(path, offset, content.length, line, 0, - endLine: 0, endColumn: 0), - SourceFileEdit(path, 0, edits: [edit])); - } - - void _replaceSpan(SourceSpan span, String content, DartFixListener listener) { - var line = span.start.line; - var offset = span.start.offset; - var edit = SourceEdit(offset, span.length, content); - listener.addSourceFileEdit( - 'enable Null Safety language feature', - Location(path, offset, content.length, line, 0, - endLine: 0, endColumn: 0), - SourceFileEdit(path, 0, edits: [edit])); - } - - static _YamlFile _parseFrom(File file) { - var textContent = file.readAsStringSync(); - var content = loadYaml(textContent); - if (content is YamlNode) { - return _YamlFile._(file.path, textContent, content); - } else { - throw FormatException('pubspec.yaml is not a YAML map.'); - } - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/offset_mapper.dart b/pkg/nnbd_migration/lib/src/front_end/offset_mapper.dart deleted file mode 100644 index 50ae63d10ae3..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/offset_mapper.dart +++ /dev/null @@ -1,159 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer_plugin/protocol/protocol_common.dart'; - -/// An object that can map the offsets before a sequence of edits to the offsets -/// after applying the edits. -abstract class OffsetMapper { - /// A mapper used for files that were not modified. - static OffsetMapper identity = _IdentityMapper(); - - /// Return a mapper representing the file modified by the given [edits]. - factory OffsetMapper.forEdits(List edits) => _EditMapper(edits); - - /// Return a mapper representing the file modified by an insertion at [offset] - /// the given with [length]. - factory OffsetMapper.forInsertion(int offset, int length) => - _SimpleSourceEditMapper(offset, 0, length); - - /// Return a mapper representing the file modified by an insertion at [offset] - /// with [replacement] text overwriting the given [length]. - factory OffsetMapper.forReplacement( - int offset, int length, String replacement) => - _SimpleSourceEditMapper(offset, length, replacement.length); - - /// Return a mapper representing [rebased] rebased by [rebaser]. - /// - /// Warning: this does not currently handle cases where the [rebased] mapper - /// contains an insert or deletion in the middle of a range deleted by - /// [rebaser]. This is not a case that currently needs to be supported. - factory OffsetMapper.rebase(OffsetMapper rebaser, OffsetMapper rebased) { - return _RebasedOffsetMapper(rebaser, rebased); - } - - /// Return a mapper representing a sequence of edits made in order, with the - /// offsets coming out of [first] being the offsets passed into [second]. - factory OffsetMapper.sequence(OffsetMapper first, OffsetMapper second) { - return _OffsetMapperChain([first, second]); - } - - /// Return the post-edit offset that corresponds to the given pre-edit - /// [offset], or `null` when that offset has been deleted. - int? map(int? offset); -} - -/// A mapper used for files that were modified by a set of edits. -class _EditMapper implements OffsetMapper { - /// A list whose elements are the highest pre-edit offset for which the - /// corresponding element of [_deltas] should be applied. - final List _offsets = []; - - /// A list whose elements are the deltas to be applied for all pre-edit - /// offsets that are less than or equal to the corresponding element of - /// [_offsets]. - final List _deltas = []; - - /// Initialize a newly created mapper based on the given set of [edits]. - _EditMapper(List edits) { - _initializeDeltas(edits); - } - - @override - int map(int? offset) => offset! + _deltaFor(offset); - - /// Return the delta to be added to the pre-edit [offset] to produce the - /// post-edit offset. - int _deltaFor(int? offset) { - for (var i = 0; i < _offsets.length; i++) { - var currentOffset = _offsets[i]; - if (currentOffset >= offset! || currentOffset < 0) { - return _deltas[i]; - } - } - // We should never get here because [_initializeDeltas] always adds an - // offset/delta pair at the end of the list whose offset is less than zero. - return 0; - } - - /// Initialize the list of old offsets and deltas used by [_deltaFor]. - void _initializeDeltas(List edits) { - var previousDelta = 0; - for (var edit in edits) { - var offset = edit.offset; - var length = edit.length; - _offsets.add(offset); - _deltas.add(previousDelta); - previousDelta += edit.replacement.length - length; - } - _offsets.add(-1); - _deltas.add(previousDelta); - } -} - -/// A mapper used for files that were not modified. -class _IdentityMapper implements OffsetMapper { - @override - int? map(int? offset) => offset; -} - -class _OffsetMapperChain implements OffsetMapper { - final List innerMappers; - - _OffsetMapperChain(this.innerMappers); - - @override - int? map(int? offset) { - for (final mapper in innerMappers) { - offset = mapper.map(offset); - if (offset == null) { - break; - } - } - return offset; - } -} - -class _RebasedOffsetMapper implements OffsetMapper { - final OffsetMapper rebaser; - final OffsetMapper rebased; - - _RebasedOffsetMapper(this.rebaser, this.rebased); - - @override - int? map(int? offset) { - final rebasedOffset = rebased.map(offset); - final rebasingOffset = rebaser.map(offset); - if (rebasedOffset == null || rebasingOffset == null) { - return null; - } - final delta = rebasedOffset - offset!; - return rebasingOffset + delta; - } -} - -class _SimpleSourceEditMapper implements OffsetMapper { - /// The offset where the replacement begins. - final int offset; - - /// The length of text to be replaced. - final int replacedLength; - - /// The length of text to be inserted as a replacement. - final int replacementLength; - - _SimpleSourceEditMapper( - this.offset, this.replacedLength, this.replacementLength); - - @override - int? map(int? offset) { - if (offset! < this.offset) { - return offset; - } - if (offset < this.offset + replacedLength) { - return null; - } - return offset + replacementLength - replacedLength; - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/path_mapper.dart b/pkg/nnbd_migration/lib/src/front_end/path_mapper.dart deleted file mode 100644 index 9b001350800b..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/path_mapper.dart +++ /dev/null @@ -1,32 +0,0 @@ -// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:analyzer/file_system/file_system.dart'; - -/// An object that can map the file paths of analyzed files to the file paths of -/// the HTML files used to view the content of those files. -class PathMapper { - /// The resource provider used to map paths. - ResourceProvider provider; - - /// The index to be used when creating the next synthetic file name. - int nextIndex = 1; - - /// Initialize a newly created path mapper. - PathMapper(this.provider); - - /// Gets the symbol used as a path separator on the local filesystem. - String get separator => provider.pathContext.separator; - - /// Return the path of the HTML file used to view the content of the analyzed - /// file with the given [path]. - String map(String path) { - return provider.pathContext.toUri(path).path; - } - - /// Returns the local filesystem path corresponding to the given [uri]. - String reverseMap(Uri uri) { - return provider.pathContext.fromUri(uri.replace(scheme: 'file')); - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/region_renderer.dart b/pkg/nnbd_migration/lib/src/front_end/region_renderer.dart deleted file mode 100644 index 700a9e327ab5..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/region_renderer.dart +++ /dev/null @@ -1,101 +0,0 @@ -// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file -// for details. All rights reserved. Use of this source code is governed by a -// BSD-style license that can be found in the LICENSE file. - -import 'package:nnbd_migration/src/front_end/migration_info.dart'; -import 'package:nnbd_migration/src/front_end/path_mapper.dart'; -import 'package:nnbd_migration/src/front_end/web/edit_details.dart'; -import 'package:path/path.dart' as path; - -/// The HTML that is displayed for a region of code. -class RegionRenderer { - /// A flag indicating whether the incremental workflow is currently supported. - static const bool supportsIncrementalWorkflow = true; - - /// The region to render. - final RegionInfo region; - - /// The compilation unit information containing the region. - final UnitInfo unitInfo; - - final MigrationInfo? migrationInfo; - - /// An object used to map the file paths of analyzed files to the file paths - /// of the HTML files used to view the content of those files. - final PathMapper? pathMapper; - - /// The auth token for the current site, for use in generating URIs. - final String authToken; - - /// Initializes a newly created region page within the given [site]. The - /// [unitInfo] provides the information needed to render the page. - RegionRenderer(this.region, this.unitInfo, this.migrationInfo, - this.pathMapper, this.authToken); - - /// Returns the path context used to manipulate paths. - path.Context get pathContext => migrationInfo!.pathContext; - - EditDetails render() { - TargetLink linkForTarget(NavigationTarget target) { - var relativePath = - _relativePathToTarget(target, pathContext.dirname(unitInfo.path!)); - var targetUri = _uriForPath(target.filePath, target); - return TargetLink( - path: relativePath, - href: targetUri, - line: target.line, - ); - } - - EditLink linkForEdit(EditDetail edit) => EditLink( - description: edit.description, - href: Uri(path: pathContext.basename(unitInfo.path!), queryParameters: { - 'offset': edit.offset.toString(), - 'end': (edit.offset + edit.length).toString(), - 'replacement': edit.replacement - }).toString()); - - var response = EditDetails( - displayPath: unitInfo.path, - uriPath: pathMapper!.map(unitInfo.path!), - line: region.lineNumber, - explanation: region.explanation, - edits: supportsIncrementalWorkflow - ? [ - for (var edit in region.edits) linkForEdit(edit), - ] - : null, - traces: [ - for (var trace in region.traces) - Trace(description: trace.description, entries: [ - for (var entry in trace.entries) - TraceEntry( - description: entry.description, - function: entry.function, - link: entry.target == null - ? null - : linkForTarget(entry.target!), - hintActions: entry.hintActions) - ]) - ], - ); - return response; - } - - /// Returns the URL that will navigate to the given [target]. - String _relativePathToTarget(NavigationTarget target, String unitDir) { - return pathMapper! - .map(pathContext.relative(target.filePath, from: unitDir)); - } - - /// Return the URL that will navigate to the given [target] in the file at the - /// given [path]. - String _uriForPath(String path, NavigationTarget target) { - var queryParams = { - 'offset': target.offset, - if (target.line != null) 'line': target.line, - 'authToken': authToken, - }.entries.map((entry) => '${entry.key}=${entry.value}').join('&'); - return '${pathMapper!.map(path)}?$queryParams'; - } -} diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/.clang-format b/pkg/nnbd_migration/lib/src/front_end/resources/.clang-format deleted file mode 100644 index ace8841e1e65..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/resources/.clang-format +++ /dev/null @@ -1,3 +0,0 @@ -# Don't format the JavaScript files in this directory. -Language: JavaScript -DisableFormat: true diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/MaterialIconsRegular.ttf b/pkg/nnbd_migration/lib/src/front_end/resources/MaterialIconsRegular.ttf deleted file mode 100644 index 7015564ad166..000000000000 Binary files a/pkg/nnbd_migration/lib/src/front_end/resources/MaterialIconsRegular.ttf and /dev/null differ diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/RobotoMonoRegular.ttf b/pkg/nnbd_migration/lib/src/front_end/resources/RobotoMonoRegular.ttf deleted file mode 100644 index 5919b5d1bf06..000000000000 Binary files a/pkg/nnbd_migration/lib/src/front_end/resources/RobotoMonoRegular.ttf and /dev/null differ diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/RobotoRegular.ttf b/pkg/nnbd_migration/lib/src/front_end/resources/RobotoRegular.ttf deleted file mode 100644 index 2b6392ffe871..000000000000 Binary files a/pkg/nnbd_migration/lib/src/front_end/resources/RobotoRegular.ttf and /dev/null differ diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/dart_192.png b/pkg/nnbd_migration/lib/src/front_end/resources/dart_192.png deleted file mode 100644 index 16ed071acfa6..000000000000 Binary files a/pkg/nnbd_migration/lib/src/front_end/resources/dart_192.png and /dev/null differ diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/highlight.css b/pkg/nnbd_migration/lib/src/front_end/resources/highlight.css deleted file mode 100644 index bc8e473b5934..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/resources/highlight.css +++ /dev/null @@ -1,66 +0,0 @@ -/* -Date: 24 Fev 2015 -Author: Pedro Oliveira -*/ - -.hljs { - color: #a9b7c6; - background: #282b2e; - display: block; - overflow-x: auto; - padding: 0.5em; -} - -.hljs-number, -.hljs-literal, -.hljs-symbol, -.hljs-bullet { - color: #6897BB; -} - -.hljs-keyword, -.hljs-selector-tag, -.hljs-deletion { - color: #cc7832; -} - -.hljs-variable, -.hljs-template-variable, -.hljs-link { - color: #629755; -} - -.hljs-comment, -.hljs-quote { - color: #808080; -} - -.hljs-meta { - color: #bbb529; -} - -.hljs-string, -.hljs-attribute, -.hljs-addition { - color: #6A8759; -} - -.hljs-section, -.hljs-title, -.hljs-type { - color: #ffc66d; -} - -.hljs-name, -.hljs-selector-id, -.hljs-selector-class { - color: #e8bf6a; -} - -.hljs-emphasis { - font-style: italic; -} - -.hljs-strong { - font-weight: bold; -} diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/highlight.md b/pkg/nnbd_migration/lib/src/front_end/resources/highlight.md deleted file mode 100644 index d23468a4418f..000000000000 --- a/pkg/nnbd_migration/lib/src/front_end/resources/highlight.md +++ /dev/null @@ -1,6 +0,0 @@ -1. Build and download highlight.zip for Dart. [1] -2. 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diff --git a/pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart b/pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart
deleted file mode 100644
index 23c8fb4e2c94..000000000000
--- a/pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart
+++ /dev/null
@@ -1,11673 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// This file is generated; don't edit it directly.
-//
-// See pkg/nnbd_migration/tool/codegen/generate_resources.dart for how
-// to edit the source content and for re-generation instructions.
-
-import 'dart:convert' as convert;
-
-String get MaterialIconsRegular_ttf {
-  return _MaterialIconsRegular_ttf ??=
-      _decode(_MaterialIconsRegular_ttf_base64);
-}
-
-String get RobotoMonoRegular_ttf {
-  return _RobotoMonoRegular_ttf ??= _decode(_RobotoMonoRegular_ttf_base64);
-}
-
-String get RobotoRegular_ttf {
-  return _RobotoRegular_ttf ??= _decode(_RobotoRegular_ttf_base64);
-}
-
-String get dart_192_png {
-  return _dart_192_png ??= _decode(_dart_192_png_base64);
-}
-
-String get highlight_css {
-  return _highlight_css ??= _decode(_highlight_css_base64);
-}
-
-String get highlight_pack_js {
-  return _highlight_pack_js ??= _decode(_highlight_pack_js_base64);
-}
-
-String get index_html {
-  return _index_html ??= _decode(_index_html_base64);
-}
-
-String get migration_css {
-  return _migration_css ??= _decode(_migration_css_base64);
-}
-
-String get migration_js {
-  return _migration_js ??= _decode(_migration_js_base64);
-}
-
-String _decode(String data) {
-  data = data.replaceAll('\n', '').trim();
-  return String.fromCharCodes(convert.base64Decode(data));
-}
-
-String? _MaterialIconsRegular_ttf;
-// MaterialIconsRegular_ttf md5 is 'a37b0c01c0baf1888ca812cc0508f6e2'
-String _MaterialIconsRegular_ttf_base64 = '''
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-
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-// RobotoMonoRegular_ttf md5 is 'b4618f1f7f4cee0ac09873fcc5a966f9'
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-''';
-
-String? _RobotoRegular_ttf;
-// RobotoRegular_ttf md5 is '11eabca2251325cfc5589c9c6fb57b46'
-String _RobotoRegular_ttf_base64 = '''
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-
-String? _dart_192_png;
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-
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-// highlight_css md5 is 'fb012626bafd286510d32da815dae448'
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-
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-// highlight_pack_js md5 is 'e2de0572f5426885d35e366c9bf60f05'
-String _highlight_pack_js_base64 = '''
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-
-String? _index_html;
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-''';
-
-String? _migration_css;
-// migration_css md5 is '0e1cb1b9f1ead1ad6ef1027cf3ee93e0'
-String _migration_css_base64 = '''
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-''';
-
-String? _migration_js;
-// migration_dart md5 is '1f11f086ebc0013cdd15679b588bd03e'
-String _migration_js_base64 = '''
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diff --git a/pkg/nnbd_migration/lib/src/front_end/unit_link.dart b/pkg/nnbd_migration/lib/src/front_end/unit_link.dart
deleted file mode 100644
index 8ab5c79a363c..000000000000
--- a/pkg/nnbd_migration/lib/src/front_end/unit_link.dart
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart';
-
-/// Information about a link to a compilation unit.
-class UnitLink {
-  final String? fullPath;
-  final List pathParts;
-  final int editCount;
-
-  /// The number of directories deep in which this compilation unit is found.
-  ///
-  /// A compilation unit in the root has a depth of 0.
-  final int depth;
-
-  /// Whether this compilation unit was explicitly opted out of null safety at
-  /// the start of this migration.
-  final bool wasExplicitlyOptedOut;
-
-  final UnitMigrationStatus? migrationStatus;
-
-  /// Whether the migration status of this compilation unit can be changed in
-  /// the web interface.
-  final bool migrationStatusCanBeChanged;
-
-  UnitLink(
-      this.fullPath,
-      this.pathParts,
-      this.editCount,
-      this.wasExplicitlyOptedOut,
-      this.migrationStatus,
-      this.migrationStatusCanBeChanged)
-      : depth = pathParts.length - 1;
-
-  String get fileName => pathParts.last;
-}
diff --git a/pkg/nnbd_migration/lib/src/front_end/unit_renderer.dart b/pkg/nnbd_migration/lib/src/front_end/unit_renderer.dart
deleted file mode 100644
index 6b6257cc2651..000000000000
--- a/pkg/nnbd_migration/lib/src/front_end/unit_renderer.dart
+++ /dev/null
@@ -1,356 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert' show HtmlEscape, HtmlEscapeMode, LineSplitter;
-
-import 'package:meta/meta.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/path_mapper.dart';
-import 'package:nnbd_migration/src/front_end/web/file_details.dart';
-import 'package:path/path.dart' as path;
-
-/// Instrumentation display output for a library that was migrated to use
-/// non-nullable types.
-class UnitRenderer {
-  /// A converter which only escapes "&", "<", and ">". Safe for use in HTML
-  /// text, between HTML elements.
-  static const HtmlEscape _htmlEscape =
-      HtmlEscape(HtmlEscapeMode(escapeLtGt: true));
-
-  /// List of kinds of nullability fixes that should be displayed in the
-  /// "proposed edits" area, in the order in which they should be displayed.
-  @visibleForTesting
-  static const List kindPriorityOrder = [
-    NullabilityFixKind.noValidMigrationForNull,
-    NullabilityFixKind.compoundAssignmentHasBadCombinedType,
-    NullabilityFixKind.compoundAssignmentHasNullableSource,
-    NullabilityFixKind.addThen,
-    NullabilityFixKind.removeDeadCode,
-    NullabilityFixKind.conditionTrueInStrongMode,
-    NullabilityFixKind.conditionFalseInStrongMode,
-    NullabilityFixKind.nullAwareAssignmentUnnecessaryInStrongMode,
-    NullabilityFixKind.nullAwarenessUnnecessaryInStrongMode,
-    NullabilityFixKind.otherCastExpression,
-    NullabilityFixKind.changeMethodName,
-    NullabilityFixKind.checkExpression,
-    NullabilityFixKind.addRequired,
-    NullabilityFixKind.makeTypeNullable,
-    NullabilityFixKind.downcastExpression,
-    NullabilityFixKind.addType,
-    NullabilityFixKind.replaceVar,
-    NullabilityFixKind.removeAs,
-    NullabilityFixKind.addLate,
-    NullabilityFixKind.addLateDueToTestSetup,
-    NullabilityFixKind.removeNullableAnnotation,
-    NullabilityFixKind.addLateDueToHint,
-    NullabilityFixKind.addLateFinalDueToHint,
-    NullabilityFixKind.checkExpressionDueToHint,
-    NullabilityFixKind.makeTypeNullableDueToHint,
-    NullabilityFixKind.addImport,
-    NullabilityFixKind.removeLanguageVersionComment
-  ];
-
-  /// Displays information for a compilation unit.
-  final UnitInfo unitInfo;
-
-  /// Information for a whole migration, so that libraries can reference each
-  /// other.
-  final MigrationInfo? migrationInfo;
-
-  /// An object used to map the file paths of analyzed files to the file paths
-  /// of the HTML files used to view the content of those files.
-  final PathMapper? pathMapper;
-
-  /// The auth token for the current site, for use in generating URIs.
-  final String authToken;
-
-  /// Creates an output object for the given library info.
-  UnitRenderer(
-      this.unitInfo, this.migrationInfo, this.pathMapper, this.authToken);
-
-  /// Return the path context used to manipulate paths.
-  path.Context get pathContext => migrationInfo!.pathContext;
-
-  /// Builds a JSON view of the instrumentation information in [unitInfo].
-  FileDetails render() {
-    return FileDetails(
-        regions: _computeRegionContent(unitInfo),
-        navigationContent: _computeNavigationContent(),
-        sourceCode: unitInfo.content,
-        edits: _computeEditList());
-  }
-
-  /// Returns the list of edits, as JSON.
-  Map> _computeEditList() {
-    var editListsByKind = >{};
-    for (var region in unitInfo.regions) {
-      var kind = region.kind;
-      if (kind != null && region.isCounted) {
-        (editListsByKind[kind] ??= []).add(EditListItem(
-            line: region.lineNumber,
-            explanation: region.explanation,
-            offset: region.offset));
-      }
-    }
-    // Order the lists and filter out empty categories.
-    var result = >{};
-    for (var kind in kindPriorityOrder) {
-      var edits = editListsByKind[kind];
-      if (edits != null) {
-        result[_headerForKind(kind, edits.length)] = edits;
-      }
-    }
-    return result;
-  }
-
-  /// Returns the content of the file with navigation links and anchors added.
-  ///
-  /// The content of the file (not including added links and anchors) will be
-  /// HTML-escaped.
-  String _computeNavigationContent() {
-    var content = unitInfo.content;
-    var mapper = unitInfo.offsetMapper;
-    var openInsertions = {};
-    var closeInsertions = {};
-    //
-    // Compute insertions for navigation targets.
-    //
-    for (var region in unitInfo.targets) {
-      if (region.length > 0) {
-        var openOffset = mapper.map(region.offset);
-        if (openOffset == null) {
-          // Region has been deleted via a hint action.
-          continue;
-        }
-        var openInsertion = openInsertions[openOffset] ?? '';
-        openInsertion = '$openInsertion';
-        openInsertions[openOffset] = openInsertion;
-
-        var closeOffset = openOffset + region.length;
-        var closeInsertion = closeInsertions[closeOffset] ?? '';
-        closeInsertion = '$closeInsertion';
-        closeInsertions[closeOffset] = closeInsertion;
-      }
-    }
-    //
-    // Compute insertions for navigation sources, but skip the sources that
-    // point at themselves.
-    //
-    for (var region in unitInfo.sources ?? []) {
-      if (region.length > 0) {
-        var openOffset = mapper.map(region.offset);
-        if (openOffset == null) {
-          // Region has been deleted via a hint action.
-          continue;
-        }
-        var target = region.target;
-        if (target.filePath != unitInfo.path ||
-            region.offset != target.offset) {
-          var openInsertion = openInsertions[openOffset] ?? '';
-          var targetUri = _uriForPath(pathMapper!.map(target.filePath), target);
-          openInsertion =
-              '$openInsertion';
-          openInsertions[openOffset] = openInsertion;
-
-          var closeOffset = openOffset + region.length;
-          var closeInsertion = closeInsertions[closeOffset] ?? '';
-          closeInsertion = '$closeInsertion';
-          closeInsertions[closeOffset] = closeInsertion;
-        }
-      }
-    }
-    //
-    // Apply the insertions that have been computed.
-    //
-    var offsets = [...openInsertions.keys, ...closeInsertions.keys];
-    offsets.sort();
-    var navContent2 = StringBuffer();
-    var previousOffset = 0;
-    for (var offset in offsets) {
-      navContent2.write(
-          _htmlEscape.convert(content!.substring(previousOffset, offset)));
-      navContent2.write(closeInsertions[offset] ?? '');
-      navContent2.write(openInsertions[offset] ?? '');
-      previousOffset = offset;
-    }
-    if (previousOffset < content!.length) {
-      navContent2.write(_htmlEscape.convert(content.substring(previousOffset)));
-    }
-    return navContent2.toString();
-  }
-
-  /// Returns the content of regions, based on the [unitInfo] for both
-  /// unmodified and modified regions.
-  ///
-  /// The content of the file (not including added links and anchors) will be
-  /// HTML-escaped.
-  String _computeRegionContent(UnitInfo unit) {
-    var content = unitInfo.content!;
-    var rows = [];
-    var currentTextCell = StringBuffer();
-    bool isAddedLine = false;
-    var lineNumber = 1;
-
-    void finishRow(bool isAddedText) {
-      var line = currentTextCell.toString();
-      if (isAddedLine) {
-        rows.add('(new)$line');
-      } else {
-        rows.add('$lineNumber'
-            '$line');
-        lineNumber++;
-      }
-      currentTextCell = StringBuffer();
-      isAddedLine = isAddedText;
-    }
-
-    void writeSplitLines(
-      String lines, {
-      String perLineOpeningTag = '',
-      String perLineClosingTag = '',
-      bool isAddedText = false,
-    }) {
-      var lineIterator = LineSplitter.split(lines).iterator;
-      lineIterator.moveNext();
-
-      while (true) {
-        currentTextCell.write(perLineOpeningTag);
-        currentTextCell.write(_htmlEscape.convert(lineIterator.current));
-        currentTextCell.write(perLineClosingTag);
-        if (lineIterator.moveNext()) {
-          // If we're not on the last element, end this row, and get ready to
-          // start a new row.
-          finishRow(isAddedText);
-        } else {
-          break;
-        }
-      }
-
-      if (lines.endsWith('\n')) {
-        finishRow(isAddedText);
-      }
-    }
-
-    /// Returns the CSS class for a region with a given [RegionType].
-    String classForRegion(RegionType type) {
-      switch (type) {
-        case RegionType.add:
-          return 'added-region';
-        case RegionType.remove:
-          return 'removed-region';
-        case RegionType.informative:
-          return 'informative-region';
-      }
-    }
-
-    var previousOffset = 0;
-    for (var region in unitInfo.regions) {
-      var offset = region.offset;
-      var length = region.length;
-      if (offset > previousOffset) {
-        // Display a region of unmodified content.
-        writeSplitLines(content.substring(previousOffset, offset));
-      }
-      previousOffset = offset + length;
-      var shouldBeShown = region.kind != null;
-      var regionClass = classForRegion(region.regionType);
-      var regionSpanTag = shouldBeShown
-          ? ''
-          : '';
-      writeSplitLines(content.substring(offset, offset + length),
-          perLineOpeningTag: regionSpanTag,
-          perLineClosingTag: shouldBeShown ? '' : '',
-          isAddedText: region.regionType == RegionType.add);
-    }
-    if (previousOffset < content.length) {
-      // Last region of unmodified content.
-      writeSplitLines(content.substring(previousOffset));
-    }
-    finishRow(false);
-    return ''
-        '${rows.join()}
';
-  }
-
-  String _headerForKind(NullabilityFixKind kind, int count) {
-    var s = count == 1 ? '' : 's';
-    var es = count == 1 ? '' : 'es';
-    switch (kind) {
-      case NullabilityFixKind.addThen:
-        return '$count invocation$s of `.then` added';
-      case NullabilityFixKind.addImport:
-        return '$count import$s added';
-      case NullabilityFixKind.addLate:
-        return '$count late keyword$s added';
-      case NullabilityFixKind.addLateDueToHint:
-        return '$count late hint$s converted to late keyword$s';
-      case NullabilityFixKind.addLateDueToTestSetup:
-        return '$count late keyword$s added, due to assignment in `setUp`';
-      case NullabilityFixKind.addLateFinalDueToHint:
-        return '$count late final hint$s converted to late and final keywords';
-      case NullabilityFixKind.addRequired:
-        return '$count required keyword$s added';
-      case NullabilityFixKind.addType:
-        return '$count type$s added';
-      case NullabilityFixKind.changeMethodName:
-        return '$count method name$s changed';
-      case NullabilityFixKind.downcastExpression:
-        return '$count downcast$s added';
-      case NullabilityFixKind.otherCastExpression:
-        return '$count cast$s (non-downcast) added';
-      case NullabilityFixKind.checkExpression:
-        return '$count null check$s added';
-      case NullabilityFixKind.checkExpressionDueToHint:
-        return '$count null check hint$s converted to null check$s';
-      case NullabilityFixKind.compoundAssignmentHasBadCombinedType:
-        return "$count compound assignment$s couldn't be migrated (bad "
-            'combined type)';
-      case NullabilityFixKind.compoundAssignmentHasNullableSource:
-        return "$count compound assignment$s couldn't be migrated (nullable "
-            'source)';
-      case NullabilityFixKind.conditionTrueInStrongMode:
-        return '$count condition$s will be true in strong checking mode';
-      case NullabilityFixKind.conditionFalseInStrongMode:
-        return '$count condition$s will be false in strong checking mode';
-      case NullabilityFixKind.makeTypeNullable:
-        return '$count type$s made nullable';
-      case NullabilityFixKind.makeTypeNullableDueToHint:
-        return '$count nullability hint$s converted to ?$s';
-      case NullabilityFixKind.noValidMigrationForNull:
-        return "$count literal `null`$s couldn't be migrated";
-      case NullabilityFixKind.nullAwarenessUnnecessaryInStrongMode:
-        return '$count null-aware access$es will be unnecessary in strong '
-            'checking mode';
-      case NullabilityFixKind.nullAwareAssignmentUnnecessaryInStrongMode:
-        return '$count null-aware assignment$s will be unnecessary in strong '
-            'checking mode';
-      case NullabilityFixKind.removeAs:
-        return '$count cast$s now unnecessary';
-      case NullabilityFixKind.removeDeadCode:
-        return '$count dead code removal$s';
-      case NullabilityFixKind.removeLanguageVersionComment:
-        return '$count language version comment$s removed';
-      case NullabilityFixKind.replaceVar:
-        return "$count 'var' declaration$s replaced";
-      case NullabilityFixKind.typeNotMadeNullable:
-        return '$count type$s not made nullable';
-      case NullabilityFixKind.typeNotMadeNullableDueToHint:
-        return '$count type$s not made nullable due to hint$s';
-      case NullabilityFixKind.removeNullableAnnotation:
-        return '$count @nullable annotation$s removed';
-    }
-  }
-
-  /// Returns the URL that will navigate to the given [target] in the file at
-  /// the given [relativePath].
-  String _uriForPath(String path, NavigationTarget target) {
-    var queryParams = {
-      'offset': target.offset,
-      if (target.line != null) 'line': target.line,
-      'authToken': authToken,
-    }.entries.map((entry) => '${entry.key}=${entry.value}').join('&');
-    return '$path?$queryParams';
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/front_end/web/edit_details.dart b/pkg/nnbd_migration/lib/src/front_end/web/edit_details.dart
deleted file mode 100644
index 4699bed1173b..000000000000
--- a/pkg/nnbd_migration/lib/src/front_end/web/edit_details.dart
+++ /dev/null
@@ -1,183 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/hint_action.dart';
-
-/// Information about what should be populated into the "Edit Details" view of
-/// the migration preview tool.
-class EditDetails {
-  /// A list of edits that can be offered to the user related to this source
-  /// location (e.g. adding/removing hints).  `null` if this feature is
-  /// disabled.
-  final List? edits;
-
-  /// A string explanation of the edit.
-  final String? explanation;
-
-  /// The line number of the edit.
-  final int? line;
-
-  /// The path of the file that was edited, to be shown to the user.
-  final String? displayPath;
-
-  /// The path of the file that was edited, as a URI.
-  final String? uriPath;
-
-  /// A list of traces representing stacktrace-like views of why the change was
-  /// made, or the empty list if there are no traces for this change.
-  final List? traces;
-
-  EditDetails(
-      {this.edits,
-      required this.explanation,
-      required this.line,
-      required this.displayPath,
-      required this.uriPath,
-      this.traces = const []});
-
-  EditDetails.fromJson(dynamic json)
-      : edits = _decodeEdits(json['edits'] as List?),
-        explanation = json['explanation'] as String?,
-        line = json['line'] as int?,
-        displayPath = json['displayPath'] as String?,
-        uriPath = json['uriPath'] as String?,
-        traces = _decodeTraces(json['traces'] as List?);
-
-  Map toJson() => {
-        if (edits != null) 'edits': [for (var edit in edits!) edit.toJson()],
-        'explanation': explanation,
-        'line': line,
-        'displayPath': displayPath,
-        'uriPath': uriPath,
-        if (traces != null)
-          'traces': [for (var trace in traces!) trace.toJson()],
-      };
-
-  static List? _decodeEdits(List? json) =>
-      json == null ? null : [for (var edit in json) EditLink.fromJson(edit)];
-
-  static List? _decodeTraces(List? json) =>
-      json == null ? null : [for (var trace in json) Trace.fromJson(trace)];
-}
-
-/// Information about a single link that should be included in the
-/// "Edit Details" view of the migration preview tool, where the purpose of the
-/// link is to allow the user to make a change to the source file (e.g. to add
-/// or remove a hint).
-class EditLink {
-  /// Description of the change to be performed.
-  final String? description;
-
-  /// The href to link to.
-  final String? href;
-
-  EditLink({required this.description, required this.href});
-
-  EditLink.fromJson(dynamic json)
-      : description = json['description'] as String?,
-        href = json['href'] as String?;
-
-  Map toJson() => {
-        'description': description,
-        'href': href,
-      };
-}
-
-/// Information about a single link that should be included in the
-/// "Edit Details" view of the migration preview tool, where the purpose of the
-/// link is to allow the user to navigate to a source file containing
-/// information about the rationale for a change.
-class TargetLink {
-  /// The href to link to.
-  final String? href;
-
-  /// The line number of the link.
-  final int? line;
-
-  /// Relative path to the source file (intended for display).
-  final String? path;
-
-  TargetLink({required this.href, required this.line, required this.path});
-
-  TargetLink.fromJson(dynamic json)
-      : href = json['href'] as String?,
-        line = json['line'] as int?,
-        path = json['path'] as String?;
-
-  Map toJson() => {
-        'href': href,
-        'line': line,
-        'path': path,
-      };
-}
-
-/// A trace of why a nullability decision was made.
-class Trace {
-  /// Text description of the trace.
-  final String? description;
-
-  /// List of trace entries.
-  final List entries;
-
-  Trace({required this.description, required this.entries});
-
-  Trace.fromJson(dynamic json)
-      : description = json['description'] as String?,
-        entries = [
-          for (var entry in json['entries'] as List)
-            TraceEntry.fromJson(entry)
-        ];
-
-  Map toJson() => {
-        'description': description,
-        'entries': [for (var entry in entries) entry.toJson()]
-      };
-}
-
-/// Information about a single entry in a nullability trace.
-class TraceEntry {
-  /// Text description of the entry.
-  final String? description;
-
-  /// The function associated with the entry.  We display this before the link
-  /// so that the trace has the familiar appearance of a stacktrace.
-  ///
-  /// Null if not known.
-  final String? function;
-
-  /// Source code location associated with the entry, or `null` if no source
-  /// code location is known.
-  final TargetLink? link;
-
-  /// The hint actions available to affect this entry of the trace, or `[]` if
-  /// none.
-  final List hintActions;
-
-  TraceEntry(
-      {required this.description,
-      this.function,
-      this.link,
-      this.hintActions = const []});
-
-  TraceEntry.fromJson(dynamic json)
-      : description = json['description'] as String?,
-        function = json['function'] as String?,
-        link = _decodeLink(json['link']),
-        hintActions = (json['hintActions'] as List?)
-                ?.map((value) =>
-                    HintAction.fromJson(value as Map))
-                .toList() ??
-            const [];
-
-  Map toJson() => {
-        'description': description,
-        if (function != null) 'function': function,
-        if (link != null) 'link': link!.toJson(),
-        if (hintActions.isNotEmpty)
-          'hintActions': hintActions.map((action) => action.toJson()).toList()
-      };
-
-  static TargetLink? _decodeLink(dynamic json) =>
-      json == null ? null : TargetLink.fromJson(json);
-}
diff --git a/pkg/nnbd_migration/lib/src/front_end/web/file_details.dart b/pkg/nnbd_migration/lib/src/front_end/web/file_details.dart
deleted file mode 100644
index d9174a857dc4..000000000000
--- a/pkg/nnbd_migration/lib/src/front_end/web/file_details.dart
+++ /dev/null
@@ -1,89 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/// Information about an item that should show up in the "proposed edits" panel.
-class EditListItem {
-  /// Line number of this edit.
-  final int? line;
-
-  /// Human-readable explanation of this edit.
-  final String? explanation;
-
-  /// File offset of this edit
-  final int? offset;
-
-  EditListItem(
-      {required this.line, required this.explanation, required this.offset});
-
-  EditListItem.fromJson(dynamic json)
-      : line = json['line'] as int?,
-        explanation = json['explanation'] as String?,
-        offset = json['offset'] as int?;
-
-  Map toJson() =>
-      {'line': line, 'explanation': explanation, 'offset': offset};
-}
-
-/// Information about how a single file should be migrated.
-class FileDetails {
-  /// HTML representation of the source file with spans added to represent
-  /// added, removed, and unchanged file regions.
-  ///
-  /// TODO(paulberry): this should be replaced by a more neutral data structure.
-  final String? regions;
-
-  /// HTML representation of the source file with links added to allow
-  /// navigation through source files.
-  ///
-  /// Also contains line number text and the anchors targeted by links that link
-  /// to a specific line number.
-  ///
-  /// TODO(paulberry): this should be replaced by a more neutral data structure.
-  final String? navigationContent;
-
-  /// Textual representation of the source file, including both added and
-  /// removed text.
-  final String? sourceCode;
-
-  /// Items that should show up in the "proposed edits" panel for the file.
-  ///
-  /// Map keys are headers, and values are the list of edits under each header.
-  /// Map order is important--entries appearing earlier in the map are
-  /// considered more likely to be of interest to the user.
-  final Map> edits;
-
-  FileDetails(
-      {required this.regions,
-      required this.navigationContent,
-      required this.sourceCode,
-      required this.edits});
-
-  FileDetails.empty()
-      : regions = '',
-        navigationContent = '',
-        sourceCode = '',
-        edits = const {};
-
-  FileDetails.fromJson(dynamic json)
-      : regions = json['regions'] as String?,
-        navigationContent = json['navigationContent'] as String?,
-        sourceCode = json['sourceCode'] as String?,
-        edits = {
-          for (var entry in (json['edits'] as Map).entries)
-            entry.key: [
-              for (var edit in entry.value as Iterable)
-                EditListItem.fromJson(edit)
-            ]
-        };
-
-  Map toJson() => {
-        'regions': regions,
-        'navigationContent': navigationContent,
-        'sourceCode': sourceCode,
-        'edits': {
-          for (var entry in edits.entries)
-            entry.key: [for (var edit in entry.value) edit.toJson()]
-        }
-      };
-}
diff --git a/pkg/nnbd_migration/lib/src/front_end/web/highlight_js.dart b/pkg/nnbd_migration/lib/src/front_end/web/highlight_js.dart
deleted file mode 100644
index 4aeeb05d4e50..000000000000
--- a/pkg/nnbd_migration/lib/src/front_end/web/highlight_js.dart
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:html';
-import 'dart:js';
-
-final HighlightJs hljs = HighlightJs._();
-
-/// A small wrapper around the JavaScript highlight.js APIs.
-class HighlightJs {
-  static JsObject? get _hljs => context['hljs'] as JsObject?;
-
-  HighlightJs._();
-
-  void highlightBlock(Element block) {
-    _hljs!.callMethod('highlightBlock', [block]);
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/front_end/web/migration.dart b/pkg/nnbd_migration/lib/src/front_end/web/migration.dart
deleted file mode 100644
index 927f64ab47a2..000000000000
--- a/pkg/nnbd_migration/lib/src/front_end/web/migration.dart
+++ /dev/null
@@ -1,1151 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// Explicitly opt out this file from null safety, for build reasons, inside
-// Google.
-
-import 'dart:async';
-import 'dart:convert';
-import 'dart:html';
-
-import 'package:nnbd_migration/src/front_end/web/edit_details.dart';
-import 'package:nnbd_migration/src/front_end/web/file_details.dart';
-import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart';
-import 'package:nnbd_migration/src/hint_action.dart';
-import 'package:path/path.dart' as p;
-
-import 'highlight_js.dart';
-
-// TODO(devoncarew): Fix the issue where we can't load source maps.
-
-// TODO(devoncarew): Include a favicon.
-
-void main() {
-  document.addEventListener('DOMContentLoaded', (event) {
-    var path = window.location.pathname;
-    var offset = getOffset(window.location.href);
-    var lineNumber = getLine(window.location.href);
-    loadNavigationTree();
-    if (path != '/' && path != rootPath) {
-      // TODO(srawlins): replaceState?
-      loadFile(path!, offset, lineNumber, true, callback: () {
-        pushState(path, offset, lineNumber);
-      });
-    }
-
-    final applyMigrationButton = document.querySelector('.apply-migration')!;
-    applyMigrationButton.onClick.listen((event) {
-      if (window.confirm(
-          "This will apply the changes you've previewed to your working "
-          'directory. It is recommended you commit any changes you made before '
-          'doing this.')) {
-        var navigationTreeJson = [
-          for (var entity in navigationTree!) entity.toJson()
-        ];
-        doPost('/apply-migration', {'navigationTree': navigationTreeJson})
-            .then((xhr) {
-          document.body!.classes
-            ..remove('proposed')
-            ..add('applied');
-        }).catchError((Object e, st) {
-          handleError("Couldn't apply migration", e, st);
-        });
-      }
-    });
-
-    final rerunMigrationButton = document.querySelector('.rerun-migration')!;
-    rerunMigrationButton.onClick.listen((event) async {
-      try {
-        document.body!.classes.add('rerunning');
-        var response = await doPost('/rerun-migration');
-        if (response!['success'] as bool) {
-          window.location.reload();
-        } else {
-          handleRerunFailure(response['errors'] as List);
-        }
-      } catch (e, st) {
-        handleError('Failed to rerun migration', e, st);
-      } finally {
-        document.body!.classes.remove('rerunning');
-      }
-    });
-
-    final reportProblemButton = document.querySelector('.report-problem')!;
-    reportProblemButton.onClick.listen((_) {
-      window.open(getGitHubProblemUri().toString(), 'report-problem');
-    });
-
-    document.querySelector('.popup-pane .close')!.onClick.listen(
-        (_) => document.querySelector('.popup-pane')!.style.display = 'none');
-
-    migrateUnitStatusIcon!.onClick.listen((MouseEvent event) {
-      var unitPath = unitName!.innerText;
-      var unitNavItem = document
-          .querySelector('.nav-panel [data-name*="${Css.escape(unitPath)}"]')!
-          .parentNode as Element;
-      var statusIcon = unitNavItem.querySelector('.status-icon');
-      var entity = navigationTree!.find(unitPath);
-      if (entity is NavigationTreeFileNode &&
-          entity.migrationStatusCanBeChanged!) {
-        toggleFileMigrationStatus(entity);
-        updateIconsForNode(statusIcon, entity);
-        updateParentIcons(unitNavItem, entity);
-      }
-    });
-  });
-
-  window.addEventListener('popstate', (event) {
-    var path = window.location.pathname!;
-    var offset = getOffset(window.location.href);
-    var lineNumber = getLine(window.location.href);
-    if (path.length > 1) {
-      loadFile(path, offset, lineNumber, false);
-    } else {
-      // Blank out the page, for the index screen.
-      writeCodeAndRegions(path, FileDetails.empty(), true);
-      updatePage(' ', null);
-    }
-  });
-}
-
-/// Returns the "authToken" query parameter value of the current location.
-// TODO(srawlins): This feels a little fragile, as the user can accidentally
-//  change/remove this text, and break their session. Normally auth tokens are
-//  stored in cookies, but there is no authentication step during which the
-//  server would attach such a token to cookies. We could do a little step where
-//  the first request to the server with the token is considered
-//  "authentication", and we subsequently store the token in cookies thereafter.
-final String? authToken =
-    Uri.parse(window.location.href).queryParameters['authToken'];
-
-final Element? editListElement =
-    document.querySelector('.edit-list .panel-content');
-
-final Element? editListHeading =
-    document.querySelector('.edit-list .panel-heading');
-
-final Element? editPanel = document.querySelector('.edit-panel .panel-content');
-
-final Element? footerPanel = document.querySelector('footer');
-
-final Element? headerPanel = document.querySelector('header');
-
-final Element? migrateUnitStatusIcon =
-    document.querySelector('#migrate-unit-status-icon');
-
-final Element? migrateUnitStatusIconLabel =
-    document.querySelector('#migrate-unit-status-icon-label');
-
-List? navigationTree;
-
-final Element? unitName = document.querySelector('#unit-name');
-
-String get rootPath => querySelector('.root')!.text!.trim();
-
-String? get sdkVersion => document.getElementById('sdk-version')!.text;
-
-void addArrowClickHandler(Element arrow, {bool startsCollapsed = false}) {
-  var childList = (arrow.parentNode as Element).querySelector(':scope > ul')!;
-  // Animating height from "auto" to "0" is not supported by CSS [1], so all we
-  // have are hacks. The `* 2` allows for events in which the list grows in
-  // height when resized, with additional text wrapping.
-  // [1] https://css-tricks.com/using-css-transitions-auto-dimensions/
-  childList.style.maxHeight = '${childList.offsetHeight * 2}px';
-
-  void collapse() {
-    childList.classes.add('collapsed');
-    arrow.classes.add('collapsed');
-  }
-
-  void expand() {
-    childList.classes.remove('collapsed');
-    arrow.classes.remove('collapsed');
-  }
-
-  arrow.onClick.listen((MouseEvent event) {
-    if (!childList.classes.contains('collapsed')) {
-      collapse();
-    } else {
-      expand();
-    }
-  });
-  if (startsCollapsed) collapse();
-}
-
-void addClickHandlers(String selector, bool clearEditDetails) {
-  var parentElement = document.querySelector(selector)!;
-
-  // Add navigation handlers for navigation links in the source code.
-  List navLinks = parentElement.querySelectorAll('.nav-link');
-  for (var link in navLinks) {
-    link.onClick.listen((event) => handleNavLinkClick(event, clearEditDetails));
-  }
-
-  List regions = parentElement.querySelectorAll('.region');
-  if (regions.isNotEmpty) {
-    var table = parentElement.querySelector('table[data-path]')!;
-    var path = table.dataset['path'];
-    for (var anchor in regions) {
-      anchor.onClick.listen((event) {
-        var offset = int.parse(anchor.dataset['offset']!);
-        var line = int.parse(anchor.dataset['line']!);
-        loadAndPopulateEditDetails(path!, offset, line);
-      });
-    }
-  }
-
-  List addHintLinks = parentElement.querySelectorAll('.add-hint-link');
-  for (var link in addHintLinks) {
-    link.onClick.listen(handleAddHintLinkClick);
-  }
-}
-
-/// Creates an icon using a `` element and the Material Icons font.
-Element createIcon([String name = '']) {
-  return document.createElement('span')
-    ..classes.add('material-icons')
-    ..innerText = name;
-}
-
-/// Perform a GET request on the path, return the json decoded response.
-///
-/// Returns a T so that the various json objects can be requested (lists, maps,
-/// etc.).
-Future doGet(String path,
-        {Map queryParameters = const {}}) =>
-    doRequest(HttpRequest()
-      ..open('GET', pathWithQueryParameters(path, queryParameters), async: true)
-      ..setRequestHeader('Content-Type', 'application/json; charset=UTF-8'));
-
-/// Perform a POST request on the path, return the JSON-decoded response.
-Future?> doPost(String path, [Object? body]) => doRequest(
-    HttpRequest()
-      ..open('POST', pathWithQueryParameters(path, {}), async: true)
-      ..setRequestHeader('Content-Type', 'application/json; charset=UTF-8'),
-    body);
-
-/// Execute the [HttpRequest], handle its error codes, and return or throw the
-/// response.
-///
-/// This is preferable over helper methods on [HttpRequest] because they ignore
-/// the response body on a non-200 code. We want to get that response body in
-/// that case, though, because it may be an error response from the server with
-/// useful debugging information (stack trace etc).
-Future doRequest(HttpRequest xhr, [Object? body]) async {
-  var completer = Completer();
-  xhr.onLoad.listen((e) {
-    completer.complete(xhr);
-  });
-
-  xhr.onError.listen(completer.completeError);
-
-  xhr.send(body == null ? null : jsonEncode(body));
-
-  try {
-    await completer.future;
-  } catch (e, st) {
-    if (xhr.readyState == HttpRequest.DONE && xhr.status == 0) {
-      // Request completed with error, and no status information.  Most likely
-      // the server has terminated.
-      throw UserError('Error reaching migration preview server', '''
-This usually happens because the migration preview server has exited.  For
-example it may have been aborted with Ctrl-C, or you may have completed this
-migration, or an exception may have occurred.  Please check the console where
-you invoked `dart migrate` to verify that the preview server is still running.
-''');
-    } else {
-      // The attempt to connect to the server failed in an unexpected way.
-      // Report as many details as possible so that the user's bug report will
-      // be easier to address.
-      var details = [
-        'readyState=${xhr.readyState}',
-        'responseText=${jsonEncode(xhr.responseText)}',
-        'responseType=${jsonEncode(xhr.responseType)}',
-        'responseUrl=${jsonEncode(xhr.responseUrl)}',
-        'status=${xhr.status}',
-        'statusText=${jsonEncode(xhr.statusText)}',
-      ]
-          .map((detail) =>
-              detail.length > 40 ? '${detail.substring(0, 40)}...' : detail)
-          .join(', ');
-      throw AsyncError('Error reaching migration preview server: $details', st);
-    }
-  }
-
-  if (xhr.status == 401) {
-    // Server returned "unauthorized".  It's not useful to try to decode the
-    // response text (since it's in HTML, not JSON).  Just tell the user what
-    // happened.
-    throw UserError('Unauthorized response from migration preview server', '''
-The migration preview server has detected a mismatch between the authToken in
-your URL and the token that was generated at the time that `dart migrate` was
-run.  Have you restarted the migration server recently?  If so, you'll need to
-check its output for a fresh URL, and use that URL to perform your migration.
-''');
-  }
-  final Object? json = jsonDecode(xhr.responseText!);
-  if (xhr.status == 200) {
-    // Request OK.
-    return json as T?;
-  } else {
-    throw json!;
-  }
-}
-
-/// Returns the URL of the "new issue" form for the SDK repository,
-/// pre-populating the title, some labels, using [description], [exception], and
-/// [stackTrace] in the body.
-Uri getGitHubErrorUri(
-        String description, Object? exception, Object? stackTrace) =>
-    Uri.https('github.com', 'dart-lang/sdk/issues/new', {
-      'title': 'Customer-reported issue with null safety migration tool: '
-          '$description',
-      'labels': 'area-analyzer,analyzer-nnbd-migration,type-bug',
-      'body': '''
-$description
-
-Error: $exception
-
-Please fill in the following:
-
-**Name of package being migrated (if public)**:
-**What I was doing when this issue occurred**:
-**Is it possible to work around this issue**:
-**Has this issue happened before, and if so, how often**:
-**Dart SDK version**: $sdkVersion
-**Additional details**:
-
-Thanks for filing!
-
-Stacktrace: _auto populated by migration preview tool._
-
-```
-$stackTrace
-```
-''',
-    });
-
-/// Returns the URL of the "new issue" form for the SDK repository,
-/// pre-populating some labels and a body template.
-Uri getGitHubProblemUri() =>
-    Uri.https('github.com', 'dart-lang/sdk/issues/new', {
-      'title': 'Customer-reported issue with null safety migration tool',
-      'labels': 'area-analyzer,analyzer-nnbd-migration,type-bug',
-      'body': '''
-#### Steps to reproduce
-
-#### What did you expect to happen?
-
-#### What actually happened?
-
-_Screenshots are appreciated_
-
-**Dart SDK version**: $sdkVersion
-
-Thanks for filing!
-''',
-    });
-
-int? getLine(String location) {
-  var str = Uri.parse(location).queryParameters['line'];
-  return str == null ? null : int.tryParse(str);
-}
-
-int? getOffset(String location) {
-  var str = Uri.parse(location).queryParameters['offset'];
-  return str == null ? null : int.tryParse(str);
-}
-
-void handleAddHintLinkClick(MouseEvent event) async {
-  var path = (event.currentTarget as Element).getAttribute('href')!;
-
-  // Don't navigate on link click.
-  event.preventDefault();
-
-  try {
-    var previousScrollPosition = _getCurrentScrollPosition();
-    // Directing the server to produce an edit; request it, then do work with
-    // the response.
-    await doPost(path);
-    await loadFile(window.location.pathname!, null, null, false);
-    document.body!.classes.add('needs-rerun');
-    _scrollContentTo(previousScrollPosition);
-  } catch (e, st) {
-    handleError("couldn't add/remove hint", e, st);
-  }
-}
-
-void handleError(String header, Object exception, Object? stackTrace) {
-  String? subheader;
-  Object? details;
-  if (exception is Map &&
-      exception['success'] == false &&
-      exception.containsKey('exception') &&
-      exception.containsKey('stackTrace')) {
-    subheader = exception['exception'] as String?;
-    stackTrace = exception['stackTrace'];
-  } else if (exception is UserError) {
-    subheader = exception.message;
-    // Don't show the user a stacktrace; show them the detailed error message
-    // text instead.
-    details = exception.details;
-  } else {
-    subheader = exception.toString();
-  }
-  // If there was no detailed error message, use the stacktrace instead.
-  details ??= stackTrace;
-  final popupPane = document.querySelector('.popup-pane')!;
-  popupPane.querySelector('h2')!.innerText = header;
-  popupPane.querySelector('p')!.innerText = subheader!;
-  popupPane.querySelector('pre')!.innerText = details.toString();
-  var bottom = popupPane.querySelector('a.bottom') as AnchorElement;
-  bottom
-    ..href = getGitHubErrorUri(header, subheader, stackTrace).toString()
-    ..style.display = 'initial';
-  popupPane.style.display = 'initial';
-  logError('$header: $exception', stackTrace);
-}
-
-void handleNavLinkClick(MouseEvent event, bool clearEditDetails) {
-  Element target = event.currentTarget as Element;
-  event.preventDefault();
-
-  var location = target.getAttribute('href')!;
-  var path = _stripQuery(location);
-
-  var offset = getOffset(location);
-  var lineNumber = getLine(location);
-
-  if (offset != null) {
-    navigate(path, offset, lineNumber, clearEditDetails, callback: () {
-      pushState(path, offset, lineNumber);
-    });
-  } else {
-    navigate(path, null, null, clearEditDetails, callback: () {
-      pushState(path, null, null);
-    });
-  }
-}
-
-void handleRerunFailure(List errors) {
-  final popupPane = document.querySelector('.popup-pane')!;
-  popupPane.querySelector('h2')!.innerText = 'Failed to rerun from sources';
-  popupPane.querySelector('p')!.innerText =
-      'Sources contain static analysis errors:';
-  popupPane.querySelector('pre')!.innerText = errors.cast().map((error) {
-    return '${error['severity']} - ${error['message']} '
-        'at ${error['location']} - (${error['code']})';
-  }).join('\n');
-  popupPane.querySelector('a.bottom')!.style.display = 'none';
-  popupPane.style.display = 'initial';
-
-  // TODO(srawlins): I think we should lock down the entire web UI, except for
-  //  the "Rerun from source" button.
-}
-
-void highlightAllCode() {
-  document.querySelectorAll('.code').forEach((Element block) {
-    hljs.highlightBlock(block);
-  });
-}
-
-/// Loads the explanation for [region], into the ".panel-content" div.
-void loadAndPopulateEditDetails(String path, int? offset, int? line) async {
-  try {
-    final responseJson = await doGet>(path,
-        queryParameters: {'region': 'region', 'offset': '$offset'});
-    var response = EditDetails.fromJson(responseJson);
-    populateEditDetails(response);
-    pushState(path, offset, line);
-    addClickHandlers('.edit-panel .panel-content', false);
-  } catch (e, st) {
-    handleError("couldn't load edit details", e, st);
-  }
-}
-
-/// Loads the file at [path] from the server, optionally scrolling [offset] into
-/// view.
-Future loadFile(
-  String path,
-  int? offset,
-  int? line,
-  bool clearEditDetails, {
-  VoidCallback? callback,
-}) async {
-  // Handle the case where we're requesting a directory.
-  if (!path.endsWith('.dart')) {
-    writeCodeAndRegions(path, FileDetails.empty(), clearEditDetails);
-    updatePage(path);
-    if (callback != null) {
-      callback();
-    }
-
-    return;
-  }
-
-  try {
-    // Navigating to another file; request it, then do work with the response.
-    final response = await doGet>(path,
-        queryParameters: {'inline': 'true'});
-    writeCodeAndRegions(path, FileDetails.fromJson(response), clearEditDetails);
-    maybeScrollToAndHighlight(offset, line);
-    var filePathPart = _stripQuery(path);
-    updatePage(filePathPart, offset);
-    if (callback != null) {
-      callback();
-    }
-  } catch (e, st) {
-    handleError("couldn't load dart file $path", e, st);
-  }
-}
-
-/// Load the navigation tree into the ".nav-tree" div.
-void loadNavigationTree() async {
-  var path = '/_preview/navigationTree.json';
-
-  // Request the navigation tree, then do work with the response.
-  try {
-    final response = (await doGet>(path))!;
-    var navTree = document.querySelector('.nav-tree')!;
-    navTree.text = '';
-    navigationTree = NavigationTreeNode.listFromJson(response);
-    writeNavigationSubtree(navTree, navigationTree!,
-        enablePartialMigration: true);
-  } catch (e, st) {
-    handleError("couldn't load navigation tree", e, st);
-  }
-}
-
-void logError(Object e, Object? st) {
-  window.console.error('$e');
-  window.console.error('$st');
-}
-
-/// Scroll an element into view if it is not visible.
-void maybeScrollIntoView(Element element) {
-  var rect = element.getBoundingClientRect();
-  // A line of text in the code view is 14px high. Including it here means we
-  // only choose to _not_ scroll a line of code into view if the entire line is
-  // visible.
-  var lineHeight = 14;
-  var visibleCeiling = headerPanel!.offsetHeight + lineHeight;
-  var visibleFloor =
-      window.innerHeight! - (footerPanel!.offsetHeight + lineHeight);
-  if (rect.bottom > visibleFloor) {
-    element.scrollIntoView();
-  } else if (rect.top < visibleCeiling) {
-    element.scrollIntoView();
-  }
-}
-
-/// Scrolls target with id [offset] into view if it is not currently in view.
-///
-/// Falls back to [lineNumber] if a target with id "o$offset" does not exist.
-///
-/// Also adds the "target" class, highlighting the target, and the "highlight"
-/// class to the entire line on which the target lies.
-///
-/// If [offset] is null, instead scrolls to the top of the file.
-void maybeScrollToAndHighlight(int? offset, int? lineNumber) {
-  Element? target;
-  Element? line;
-
-  if (offset != null) {
-    target = document.getElementById('o$offset');
-    line = document.querySelector('.line-$lineNumber');
-    if (target != null) {
-      maybeScrollIntoView(target);
-      target.classes.add('target');
-    } else if (line != null) {
-      // If the target doesn't exist, but the line does, scroll that into view
-      // instead.
-      maybeScrollIntoView(line.parent!);
-    }
-    if (line != null) {
-      (line.parentNode as Element).classes.add('highlight');
-    }
-  } else {
-    // If no offset is given, this is likely a navigation link, and we need to
-    // scroll back to the top of the page.
-    var lines = document.querySelectorAll('.line-no');
-    if (lines.isEmpty) {
-      // I don't see how this could happen, but return anyhow.
-      return;
-    }
-    maybeScrollIntoView(lines.first);
-  }
-}
-
-/// Navigate to [path] and optionally scroll [offset] into view.
-///
-/// If [callback] is present, it will be called after the server response has
-/// been processed, and the content has been updated on the page.
-void navigate(
-  String? path,
-  int? offset,
-  int? lineNumber,
-  bool clearEditDetails, {
-  VoidCallback? callback,
-}) {
-  var currentOffset = getOffset(window.location.href);
-  var currentLineNumber = getLine(window.location.href);
-  removeHighlight(currentOffset, currentLineNumber);
-  if (path == window.location.pathname) {
-    // Navigating to same file; just scroll into view.
-    maybeScrollToAndHighlight(offset, lineNumber);
-    if (callback != null) {
-      callback();
-    }
-  } else {
-    loadFile(path!, offset, lineNumber, clearEditDetails, callback: callback);
-  }
-}
-
-/// Returns [path], which may include query parameters, with a new path which
-/// adds (or replaces) parameters from [queryParameters].
-///
-/// Additionally, the "authToken" parameter will be added with the authToken
-/// found in the current location.
-String pathWithQueryParameters(
-    String path, Map queryParameters) {
-  var uri = Uri.parse(path);
-  var mergedQueryParameters = {
-    ...uri.queryParameters,
-    ...queryParameters,
-    'authToken': authToken
-  };
-  return uri.replace(queryParameters: mergedQueryParameters).toString();
-}
-
-String pluralize(int count, String single, {String? multiple}) {
-  return count == 1 ? single : (multiple ?? '${single}s');
-}
-
-void populateEditDetails([EditDetails? response]) {
-  // Clear out any current edit details.
-  editPanel!.text = '';
-  if (response == null) {
-    Element p = ParagraphElement()
-      ..text = 'See details about a proposed edit.'
-      ..classes = ['placeholder'];
-    editPanel!.append(p);
-    p.scrollIntoView();
-    return;
-  }
-
-  var fileDisplayPath = response.displayPath!;
-  var parentDirectory = p.dirname(fileDisplayPath);
-
-  // 'Changed ... at foo.dart:12.'
-  var explanationMessage = response.explanation;
-  var relPath = p.relative(fileDisplayPath, from: rootPath);
-  var line = response.line;
-  Element explanation = document.createElement('p');
-  editPanel!.append(explanation);
-  explanation
-    ..appendText('$explanationMessage at ')
-    ..append(AnchorElement(
-        href: pathWithQueryParameters(
-            response.uriPath!, {'line': line.toString()}))
-      ..appendText('$relPath:$line.'));
-  explanation.scrollIntoView();
-  _populateEditTraces(response, editPanel, parentDirectory);
-  _populateEditLinks(response, editPanel);
-}
-
-/// Write the contents of the Edit List, from JSON data [editListData].
-void populateProposedEdits(
-    String path, Map> edits, bool clearEditDetails) {
-  editListElement!.text = '';
-
-  var editCount = edits.length;
-
-  if (editCount < 2) {
-    editListHeading!.innerText = 'Proposed Edits';
-  } else {
-    int total = edits.entries.fold(0, (sum, edit) => sum + edit.value.length);
-    editListHeading!.innerText = '$total Proposed Edits';
-  }
-
-  if (editCount == 0) {
-    Element p = document.createElement('p');
-    editListElement!.append(p);
-    p.append(Text('No proposed edits'));
-  } else {
-    for (var entry in edits.entries) {
-      Element p = document.createElement('p');
-      editListElement!.append(p);
-      p.append(Text('${entry.key}:'));
-
-      Element list = document.createElement('ul');
-      editListElement!.append(list);
-      for (var edit in entry.value) {
-        Element item = document.createElement('li');
-        list.append(item);
-        item.classes.add('edit');
-        AnchorElement anchor = AnchorElement();
-        item.append(anchor);
-        anchor.classes.add('edit-link');
-        var offset = edit.offset;
-        anchor.dataset['offset'] = '$offset';
-        var line = edit.line;
-        anchor.dataset['line'] = '$line';
-        anchor.append(Text('line $line'));
-        anchor.setAttribute(
-            'href',
-            pathWithQueryParameters(window.location.pathname!, {
-              'line': '$line',
-              'offset': '$offset',
-            }));
-        anchor.onClick.listen((MouseEvent event) {
-          event.preventDefault();
-          navigate(window.location.pathname, offset, line, true, callback: () {
-            pushState(window.location.pathname, offset, line);
-          });
-          loadAndPopulateEditDetails(path, offset, line);
-        });
-        item.append(Text(': ${edit.explanation}'));
-      }
-    }
-  }
-
-  if (clearEditDetails) {
-    populateEditDetails();
-  }
-}
-
-void pushState(String? path, int? offset, int? line) {
-  var uri = Uri.parse('${window.location.origin}$path');
-
-  var params = {
-    if (offset != null) 'offset': '$offset',
-    if (line != null) 'line': '$line',
-    'authToken': authToken,
-  };
-
-  uri = uri.replace(queryParameters: params);
-  window.history.pushState({}, '', uri.toString());
-}
-
-/// If [path] lies within [root], return the relative path of [path] from [root].
-/// Otherwise, return [path].
-String relativePath(String path) {
-  var root = '${querySelector('.root')!.text!}/';
-  if (path.startsWith(root)) {
-    return path.substring(root.length);
-  } else {
-    return path;
-  }
-}
-
-/// Remove highlighting from [offset].
-void removeHighlight(int? offset, int? lineNumber) {
-  if (offset != null) {
-    var anchor = document.getElementById('o$offset');
-    if (anchor != null) {
-      anchor.classes.remove('target');
-    }
-  }
-  if (lineNumber != null) {
-    var line = document.querySelector('.line-$lineNumber');
-    if (line != null) {
-      line.parent!.classes.remove('highlight');
-    }
-  }
-}
-
-void toggleDirectoryMigrationStatus(NavigationTreeDirectoryNode entity) {
-  switch (entity.migrationStatus) {
-    case UnitMigrationStatus.alreadyMigrated:
-      // This tree cannot be toggled.
-      break;
-    case UnitMigrationStatus.migrating:
-      // At least one child file is 'migrating' (some may be 'already
-      // migrated'). Toggle all 'migrating' children to opt out.
-      entity.toggleChildrenToOptOut();
-      break;
-    case UnitMigrationStatus.optingOut:
-      // At least one child file is 'opting out' (some may be 'already
-      // migrated'). Toggle all 'migrating' children to migrate.
-      entity.toggleChildrenToMigrate();
-      break;
-    case UnitMigrationStatus.indeterminate:
-      // At least one child file is 'migrating' and at least one child file is
-      // 'opting out' (some may be 'already migrated'). Toggle all 'migrating'
-      // children to migrate.
-      entity.toggleChildrenToMigrate();
-  }
-}
-
-void toggleFileMigrationStatus(NavigationTreeFileNode entity) {
-  switch (entity.migrationStatus) {
-    case UnitMigrationStatus.alreadyMigrated:
-      // This file cannot be toggled.
-      break;
-    case UnitMigrationStatus.migrating:
-      entity.migrationStatus = UnitMigrationStatus.optingOut;
-      break;
-    case UnitMigrationStatus.optingOut:
-      entity.migrationStatus = UnitMigrationStatus.migrating;
-      break;
-    case UnitMigrationStatus.indeterminate:
-      throw StateError('File ${entity.path} should not have '
-          'indeterminate migration status');
-    default:
-      // TODO(paulberry): this should never happen.
-      break;
-  }
-}
-
-/// Updates [icon] according to [status].
-void updateIconForStatus(Element? icon, UnitMigrationStatus? status) {
-  switch (status) {
-    case UnitMigrationStatus.alreadyMigrated:
-      icon!.innerText = 'check_box';
-      icon.classes.add('already-migrated');
-      icon.classes.add('disabled');
-      icon.setAttribute('title', 'Already migrated');
-      break;
-    case UnitMigrationStatus.migrating:
-      icon!.innerText = 'check_box';
-      icon.classes.remove('opted-out');
-      icon.classes.add('migrating');
-      icon.setAttribute('title', 'Migrating to null safety');
-      break;
-    case UnitMigrationStatus.optingOut:
-      icon!.innerText = 'check_box_outline_blank';
-      icon.classes.remove('migrating');
-      icon.classes.add('opted-out');
-      icon.setAttribute('title', 'Opting out of null safety');
-      break;
-    default:
-      icon!.innerText = 'indeterminate_check_box';
-      icon.classes.remove('migrating');
-      // 'opted-out' is the same style as 'indeterminate'.
-      icon.classes.add('opted-out');
-      icon.setAttribute(
-          'title', "Mixed statuses of 'migrating' and 'opting out'");
-      break;
-  }
-}
-
-/// Updates the navigation [icon] and current file icon according to the current
-/// migration status of [entity].
-void updateIconsForNode(Element? icon, NavigationTreeNode entity) {
-  var status = entity.migrationStatus;
-  updateIconForStatus(icon, status);
-  // Update the status at the top of the file view if [entity] represents the
-  // current file.
-  var unitPath = unitName!.innerText;
-  if (entity.path == unitPath) {
-    if (entity is NavigationTreeFileNode &&
-        !entity.migrationStatusCanBeChanged!) {
-      icon!.classes.add('disabled');
-    } else {
-      icon!.classes.remove('disabled');
-    }
-    updateIconForStatus(migrateUnitStatusIcon, status);
-  }
-}
-
-/// Update the heading and navigation links.
-///
-/// Call this after updating page content on a navigation.
-void updatePage(String path, [int? offset]) {
-  path = relativePath(path);
-  // Update page heading.
-  unitName!.text = path;
-  // Update navigation styles.
-  document.querySelectorAll('.nav-panel .nav-link').forEach((Element link) {
-    var name = link.dataset['name'];
-    if (name == path) {
-      link.classes.add('selected-file');
-    } else {
-      link.classes.remove('selected-file');
-    }
-  });
-  // Note: navigationTree might not be loaded yet if the user is clicking around
-  // fast, so we need to allow for the possibility that `navigationTree` might
-  // be `null`.
-  var entity = navigationTree?.find(path);
-  // Update migration status for files in current migration.
-  if (entity == null) {
-    migrateUnitStatusIconLabel!.classes.remove('visible');
-  } else {
-    migrateUnitStatusIconLabel!.classes.add('visible');
-    updateIconForStatus(migrateUnitStatusIcon, entity.migrationStatus);
-  }
-}
-
-/// Updates the parent icons of [entity] with list item [element] in the
-/// navigation tree.
-void updateParentIcons(Element element, NavigationTreeNode entity) {
-  var parent = entity.parent;
-  if (parent != null) {
-    var parentElement = (element.parentNode as Element).parentNode as Element;
-    var statusIcon = parentElement.querySelector(':scope > .status-icon');
-    updateIconsForNode(statusIcon, parent);
-    updateParentIcons(parentElement, parent);
-  }
-}
-
-/// Updates subtree icons for the children [entity] with list item [element].
-void updateSubtreeIcons(Element? element, NavigationTreeDirectoryNode entity) {
-  for (var child in entity.subtree!) {
-    var childNode =
-        element!.querySelector('[data-name*="${Css.escape(child.path!)}"]');
-    if (child is NavigationTreeDirectoryNode) {
-      updateSubtreeIcons(childNode, child);
-      var childIcon = childNode!.querySelector(':scope > .status-icon');
-      updateIconsForNode(childIcon, entity);
-    } else {
-      var childIcon = (childNode!.parentNode as Element)
-          .querySelector(':scope > .status-icon');
-      updateIconsForNode(childIcon, child);
-    }
-  }
-}
-
-/// Load data from [data] into the .code and the .regions divs.
-void writeCodeAndRegions(String path, FileDetails data, bool clearEditDetails) {
-  var regionsElement = document.querySelector('.regions')!;
-  var codeElement = document.querySelector('.code')!;
-
-  _PermissiveNodeValidator.setInnerHtml(regionsElement, data.regions);
-  _PermissiveNodeValidator.setInnerHtml(codeElement, data.navigationContent);
-  populateProposedEdits(path, data.edits, clearEditDetails);
-
-  // highlightAllCode is remarkably slow (about 4 seconds to handle a 300k file
-  // on a Pixelbook), so skip it for large files.
-  if (data.sourceCode!.length < 200000) {
-    highlightAllCode();
-  }
-  addClickHandlers('.code', true);
-  addClickHandlers('.regions', true);
-}
-
-void writeNavigationSubtree(
-    Element parentElement, List tree,
-    {bool enablePartialMigration = false}) {
-  Element ul = document.createElement('ul');
-  parentElement.append(ul);
-  for (var entity in tree) {
-    Element li = document.createElement('li');
-    ul.append(li);
-    if (entity is NavigationTreeDirectoryNode) {
-      li.classes.add('dir');
-      li.dataset['name'] = entity.path!;
-      Element arrow = document.createElement('span');
-      li.append(arrow);
-      arrow.classes.add('arrow');
-      arrow.text = '\u25BC';
-      var folderIcon = createIcon('folder_open');
-      li.append(folderIcon);
-      li.append(Text(entity.name!));
-      writeNavigationSubtree(li, entity.subtree!,
-          enablePartialMigration: enablePartialMigration);
-      if (enablePartialMigration) {
-        var statusIcon = createIcon('indeterminate_check_box')
-          ..classes.add('status-icon');
-        updateIconsForNode(statusIcon, entity);
-        statusIcon.onClick.listen((MouseEvent event) {
-          toggleDirectoryMigrationStatus(entity);
-          updateSubtreeIcons(li, entity);
-          updateIconsForNode(statusIcon, entity);
-          updateParentIcons(li, entity);
-        });
-        li.insertBefore(statusIcon, folderIcon);
-      }
-      addArrowClickHandler(arrow,
-          startsCollapsed:
-              entity.migrationStatus == UnitMigrationStatus.alreadyMigrated);
-    } else if (entity is NavigationTreeFileNode) {
-      if (enablePartialMigration) {
-        var statusIcon = createIcon()..classes.add('status-icon');
-        if (!entity.migrationStatusCanBeChanged!) {
-          statusIcon.classes.add('disabled');
-        }
-        updateIconsForNode(statusIcon, entity);
-        if (entity.migrationStatusCanBeChanged!) {
-          statusIcon.onClick.listen((MouseEvent event) {
-            toggleFileMigrationStatus(entity);
-            updateIconsForNode(statusIcon, entity);
-            updateParentIcons(li, entity);
-          });
-        }
-        li.append(statusIcon);
-      }
-      li.append(createIcon('insert_drive_file'));
-      Element a = document.createElement('a');
-      li.append(a);
-      a.classes.add('nav-link');
-      a.dataset['name'] = entity.path!;
-      a.setAttribute('href', pathWithQueryParameters(entity.href!, {}));
-      a.append(Text(entity.name!));
-      a.onClick.listen((MouseEvent event) => handleNavLinkClick(event, true));
-      var editCount = entity.editCount!;
-      if (editCount > 0) {
-        Element editsBadge = document.createElement('span');
-        li.append(editsBadge);
-        editsBadge.classes.add('edit-count');
-        editsBadge.setAttribute(
-            'title', '$editCount ${pluralize(editCount, 'proposed edit')}');
-        editsBadge.append(Text(editCount.toString()));
-      }
-    }
-  }
-}
-
-void _addHintAction(HintAction hintAction, Node drawer, TargetLink? link) {
-  drawer.append(ButtonElement()
-    ..onClick.listen((event) async {
-      try {
-        var previousScrollPosition = _getCurrentScrollPosition();
-        await doPost(
-            pathWithQueryParameters('/apply-hint', {}), hintAction.toJson());
-        var path = _stripQuery(link!.href!);
-        await loadFile(path, null, link.line, false);
-        document.body!.classes.add('needs-rerun');
-        _scrollContentTo(previousScrollPosition);
-      } catch (e, st) {
-        handleError("couldn't apply hint", e, st);
-      }
-    })
-    ..appendText(hintAction.kind.description!));
-}
-
-AnchorElement _aElementForLink(TargetLink link) {
-  var targetLine = link.line;
-  AnchorElement a = AnchorElement();
-  a.append(Text('${link.path}:$targetLine'));
-  a.setAttribute('href', link.href!);
-  a.classes.add('nav-link');
-  return a;
-}
-
-int _getCurrentScrollPosition() =>
-    document.querySelector('.content')!.scrollTop;
-
-void _populateEditLinks(EditDetails response, Element? editPanel) {
-  if (response.edits == null) {
-    return;
-  }
-
-  var subheading = editPanel!.append(document.createElement('p'));
-  subheading.append(document.createElement('span')
-    ..classes = ['type-description']
-    ..append(Text('Actions')));
-  subheading.append(Text(':'));
-
-  Element editParagraph = document.createElement('p');
-  editPanel.append(editParagraph);
-  for (var edit in response.edits!) {
-    Element a = document.createElement('a');
-    editParagraph.append(a);
-    a.append(Text(edit.description!));
-    a.setAttribute('href', edit.href!);
-    a.classes = ['add-hint-link', 'before-apply', 'button'];
-  }
-}
-
-void _populateEditTraces(
-    EditDetails response, Element? editPanel, String parentDirectory) {
-  for (var trace in response.traces!) {
-    var traceParagraph =
-        editPanel!.append(document.createElement('p')..classes = ['trace']);
-    traceParagraph.append(document.createElement('span')
-      ..classes = ['type-description']
-      ..append(Text(trace.description!)));
-    traceParagraph.append(Text(':'));
-    var ul = traceParagraph
-        .append(document.createElement('ul')..classes = ['trace']);
-    for (var entry in trace.entries) {
-      Element li = document.createElement('li');
-      ul.append(li);
-      li.append(document.createElement('span')
-        ..classes = ['function']
-        ..appendTextWithBreaks(entry.function ?? 'unknown'));
-      var link = entry.link;
-      if (link != null) {
-        li.append(Text(' ('));
-        li.append(_aElementForLink(link));
-        li.append(Text(')'));
-      }
-      li.append(Text(': '));
-      li.appendTextWithBreaks(entry.description ?? 'unknown');
-
-      if (entry.hintActions.isNotEmpty) {
-        var drawer = li.append(
-            document.createElement('p')..classes = ['drawer', 'before-apply']);
-        for (final hintAction in entry.hintActions) {
-          _addHintAction(hintAction, drawer, link);
-        }
-      }
-    }
-  }
-}
-
-void _scrollContentTo(int top) =>
-    document.querySelector('.content')!.scrollTop = top;
-
-String _stripQuery(String path) =>
-    path.contains('?') ? path.substring(0, path.indexOf('?')) : path;
-
-class UserError extends Error implements Exception {
-  final String message;
-
-  final String details;
-
-  UserError(this.message, this.details);
-
-  String toString() => '$message:\n$details';
-}
-
-class _PermissiveNodeValidator implements NodeValidator {
-  static _PermissiveNodeValidator instance = _PermissiveNodeValidator();
-
-  @override
-  bool allowsAttribute(Element element, String attributeName, String value) {
-    return true;
-  }
-
-  @override
-  bool allowsElement(Element element) {
-    return true;
-  }
-
-  static void setInnerHtml(Element element, String? html) {
-    element.setInnerHtml(html, validator: instance);
-  }
-}
-
-extension on List {
-  /// Finds the node with path equal to [path], recursively, or `null`.
-  NavigationTreeNode? find(String path) {
-    for (var node in this) {
-      if (node is NavigationTreeDirectoryNode) {
-        var foundInSubtree = node.subtree!.find(path);
-        if (foundInSubtree != null) return foundInSubtree;
-      } else {
-        assert(node is NavigationTreeFileNode);
-        if (node.path == path) return node;
-      }
-    }
-    return null;
-  }
-}
-
-/// An extension on Element that fits into cascades.
-extension on Element {
-  /// Append [text] to this, inserting a word break before each '.' character.
-  void appendTextWithBreaks(String text) {
-    var textParts = text.split('.');
-    append(Text(textParts.first));
-    for (var substring in textParts.skip(1)) {
-      // Replace the '.' with a zero-width space and a '.'.
-      appendHtml('​.');
-      append(Text(substring));
-    }
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/front_end/web/navigation_tree.dart b/pkg/nnbd_migration/lib/src/front_end/web/navigation_tree.dart
deleted file mode 100644
index 1c4059075bcb..000000000000
--- a/pkg/nnbd_migration/lib/src/front_end/web/navigation_tree.dart
+++ /dev/null
@@ -1,251 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-class NavigationTreeDirectoryNode extends NavigationTreeNode {
-  /// If this is a directory node, list of nodes nested under this one.
-  /// Otherwise `null`.
-  final List? subtree;
-
-  /// Creates a navigation tree node representing a directory.
-  NavigationTreeDirectoryNode(
-      {required super.name, required super.path, required this.subtree})
-      : super._();
-
-  /// Returns the status by examining [subtree]:
-  ///
-  /// * If all children nodes have the same status, then that status is returned.
-  /// * Otherwise, if all children nodes are either 'alreadyMigrated' or
-  ///   'migrating', then [UnitMigrationStatus.migrating] is returned.
-  /// * Otherwise, if all children nodes are either 'alreadyMigrated' or
-  ///   'opting out', then [UnitMigrationStatus.optingOut] is returned.
-  /// * Otherwise, [UnitMigrationStatus.indeterminate] is returned.
-  UnitMigrationStatus get migrationStatus {
-    if (subtree!.isEmpty) return UnitMigrationStatus.alreadyMigrated;
-    var sharedStatus = subtree!.first.migrationStatus;
-    var allAreMigratedOrMigrating = true;
-    var allAreMigratedOrOptingOut = true;
-    for (var child in subtree!) {
-      var childMigrationStatus = child.migrationStatus;
-
-      if (childMigrationStatus != sharedStatus) {
-        sharedStatus = null;
-      }
-      if (childMigrationStatus != UnitMigrationStatus.alreadyMigrated &&
-          childMigrationStatus != UnitMigrationStatus.migrating) {
-        allAreMigratedOrMigrating = false;
-      }
-      if (childMigrationStatus != UnitMigrationStatus.alreadyMigrated &&
-          childMigrationStatus != UnitMigrationStatus.optingOut) {
-        allAreMigratedOrOptingOut = false;
-      }
-    }
-    if (sharedStatus != null) {
-      return sharedStatus;
-    }
-    if (allAreMigratedOrMigrating) {
-      return UnitMigrationStatus.migrating;
-    }
-    if (allAreMigratedOrOptingOut) {
-      // TODO(srawlins): Is this confusing? Should there be an 'optingOutStar'
-      // which indicates that all opted out files will remain opted out, though
-      // some files exist in the subtree which are already migrated.
-      return UnitMigrationStatus.optingOut;
-    }
-    return UnitMigrationStatus.indeterminate;
-  }
-
-  NavigationTreeNodeType get type => NavigationTreeNodeType.directory;
-
-  void setSubtreeParents() {
-    if (subtree != null) {
-      for (var child in subtree!) {
-        child.parent = this;
-      }
-    }
-  }
-
-  /// Toggle child nodes (recursively) to migrate to null safety.
-  ///
-  /// Only child nodes with 'opting out' or 'keep opted out' status are changed.
-  void toggleChildrenToMigrate() {
-    //assert(type == NavigationTreeNodeType.directory);
-    for (var child in subtree!) {
-      if (child is NavigationTreeDirectoryNode) {
-        child.toggleChildrenToMigrate();
-      } else if (child is NavigationTreeFileNode &&
-          child.migrationStatusCanBeChanged! &&
-          child.migrationStatus == UnitMigrationStatus.optingOut) {
-        child.migrationStatus = UnitMigrationStatus.migrating;
-      }
-    }
-  }
-
-  /// Toggle child nodes (recursively) to opt out of null safety.
-  ///
-  /// Only child nodes with 'migrating' status are changed.
-  void toggleChildrenToOptOut() {
-    for (var child in subtree!) {
-      if (child is NavigationTreeDirectoryNode) {
-        child.toggleChildrenToOptOut();
-      } else if (child is NavigationTreeFileNode &&
-          child.migrationStatusCanBeChanged! &&
-          child.migrationStatus == UnitMigrationStatus.migrating) {
-        child.migrationStatus = UnitMigrationStatus.optingOut;
-      }
-    }
-  }
-
-  Map toJson() => {
-        'type': 'directory',
-        'name': name,
-        'subtree': NavigationTreeNode.listToJson(subtree!),
-        if (path != null) 'path': path,
-      };
-}
-
-class NavigationTreeFileNode extends NavigationTreeNode {
-  /// If this is a file node, href that should be used if the file is clicked
-  /// on, otherwise `null`.
-  final String? href;
-
-  /// If this is a file node, number of edits that were made in the file,
-  /// otherwise `null`.
-  final int? editCount;
-
-  final bool? wasExplicitlyOptedOut;
-
-  UnitMigrationStatus? migrationStatus;
-
-  final bool? migrationStatusCanBeChanged;
-
-  /// Creates a navigation tree node representing a file.
-  NavigationTreeFileNode(
-      {required super.name,
-      required super.path,
-      required this.href,
-      required this.editCount,
-      required this.wasExplicitlyOptedOut,
-      required this.migrationStatus,
-      required this.migrationStatusCanBeChanged})
-      : super._();
-
-  NavigationTreeNodeType get type => NavigationTreeNodeType.file;
-
-  Map toJson() => {
-        'type': 'file',
-        'name': name,
-        if (path != null) 'path': path,
-        if (href != null) 'href': href,
-        if (editCount != null) 'editCount': editCount,
-        if (wasExplicitlyOptedOut != null)
-          'wasExplicitlyOptedOut': wasExplicitlyOptedOut,
-        if (migrationStatus != null) 'migrationStatus': migrationStatus!.index,
-        if (migrationStatusCanBeChanged != null)
-          'migrationStatusCanBeChanged': migrationStatusCanBeChanged,
-      };
-}
-
-/// Information about a node in the migration tool's navigation tree.
-abstract class NavigationTreeNode {
-  /// Name of the node.
-  final String? name;
-
-  /// Parent of this node, or `null` if this is a top-level node.
-  late final NavigationTreeNode? parent;
-
-  /// Relative path to the file or directory from the package root.
-  final String? path;
-
-  factory NavigationTreeNode.fromJson(dynamic json) {
-    var type = _decodeType(json['type'] as String?);
-    if (type == NavigationTreeNodeType.directory) {
-      return NavigationTreeDirectoryNode(
-          name: json['name'] as String?,
-          path: json['path'] as String?,
-          subtree: listFromJsonOrNull(json['subtree']))
-        ..setSubtreeParents();
-    } else {
-      return NavigationTreeFileNode(
-        name: json['name'] as String?,
-        path: json['path'] as String?,
-        href: json['href'] as String?,
-        editCount: json['editCount'] as int?,
-        wasExplicitlyOptedOut: json['wasExplicitlyOptedOut'] as bool?,
-        migrationStatus:
-            _decodeMigrationStatus(json['migrationStatus'] as int?),
-        migrationStatusCanBeChanged:
-            json['migrationStatusCanBeChanged'] as bool?,
-      );
-    }
-  }
-
-  NavigationTreeNode._({required this.name, required this.path});
-
-  /// The migration status of the file or directory.
-  UnitMigrationStatus? get migrationStatus;
-
-  NavigationTreeNodeType get type;
-
-  Map toJson();
-
-  /// Deserializes a list of navigation tree nodes from a JSON list.
-  static List listFromJson(List json) =>
-      [for (var node in json) NavigationTreeNode.fromJson(node)];
-
-  /// Deserializes a list of navigation tree nodes from a possibly null JSON
-  /// list.  If the argument is `null`, `null` is returned.
-  static List? listFromJsonOrNull(dynamic json) =>
-      json == null ? null : listFromJson(json as List);
-
-  /// Serializes a list of navigation tree nodes into JSON.
-  static List> listToJson(
-          List nodes) =>
-      [for (var node in nodes) node.toJson()];
-
-  static UnitMigrationStatus? _decodeMigrationStatus(int? migrationStatus) {
-    if (migrationStatus == null) return null;
-    return UnitMigrationStatus.values[migrationStatus];
-  }
-
-  static NavigationTreeNodeType _decodeType(String? json) {
-    switch (json) {
-      case 'directory':
-        return NavigationTreeNodeType.directory;
-      case 'file':
-        return NavigationTreeNodeType.file;
-      default:
-        throw StateError('Unrecognized navigation tree node type: $json');
-    }
-  }
-}
-
-/// Enum representing the different types of [NavigationTreeNode]s.
-enum NavigationTreeNodeType {
-  directory,
-  file,
-}
-
-/// Enum representing the different statuses a compilation unit can have.
-enum UnitMigrationStatus {
-  /// Indicates that a library was already migrated to null safety at the start
-  /// of the current migration.
-  alreadyMigrated,
-
-  /// Indicates that a directory's status is indeterminate, because the statuses
-  /// of it's children libraries (recursive) are mixed.
-  indeterminate,
-
-  /// Indicates that a library was not migrated to null safety at the start of
-  /// the current migration (either the package was not opted in, or the library
-  /// was explicitly opted out), and that the current migration does migrate the
-  /// library.
-  migrating,
-
-  /// Indicates that the current migration opts the library out of null safety.
-  ///
-  /// This may mean that the library is explicitly opted out with a Dart
-  /// language version comment, or that the package is currently opted out of
-  /// null safety.
-  optingOut,
-}
diff --git a/pkg/nnbd_migration/lib/src/hint_action.dart b/pkg/nnbd_migration/lib/src/hint_action.dart
deleted file mode 100644
index 4c868c7635e8..000000000000
--- a/pkg/nnbd_migration/lib/src/hint_action.dart
+++ /dev/null
@@ -1,68 +0,0 @@
-// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/// Everything the front end needs to know to tell the server to perform a hint
-/// action.
-class HintAction {
-  final HintActionKind kind;
-  final int? nodeId;
-  HintAction(this.kind, this.nodeId);
-
-  HintAction.fromJson(Map json)
-      : nodeId = json['nodeId'] as int?,
-        kind = HintActionKind.values
-            .singleWhere((action) => action.index == json['kind']);
-
-  Map toJson() => {
-        'nodeId': nodeId,
-        'kind': kind.index,
-      };
-}
-
-/// Enum describing the possible hints that can be performed on an edge or a
-/// node.
-///
-/// Which actions are available can be built by other visitors, and the hint can
-/// be applied by visitors such as EditPlanner when the user requests it from
-/// the front end.
-enum HintActionKind {
-  /// Add a `/*?*/` hint to a type.
-  addNullableHint,
-
-  /// Add a `/*!*/` hint to a type.
-  addNonNullableHint,
-
-  /// Change a `/*!*/` hint to a `/*?*/` hint.
-  changeToNullableHint,
-
-  /// Change a `/*?*/` hint to a `/*!*/` hint.
-  changeToNonNullableHint,
-
-  /// Remove a `/*?*/` hint.
-  removeNullableHint,
-
-  /// Remove a `/*!*/` hint.
-  removeNonNullableHint,
-}
-
-/// Extension methods to make [HintActionKind] act as a smart enum.
-extension HintActionKindBehaviors on HintActionKind {
-  /// Get the text description of a [HintActionKind], for display to users.
-  String? get description {
-    switch (this) {
-      case HintActionKind.addNullableHint:
-        return 'Add /*?*/ hint';
-      case HintActionKind.addNonNullableHint:
-        return 'Add /*!*/ hint';
-      case HintActionKind.removeNullableHint:
-        return 'Remove /*?*/ hint';
-      case HintActionKind.removeNonNullableHint:
-        return 'Remove /*!*/ hint';
-      case HintActionKind.changeToNullableHint:
-        return 'Change to /*?*/ hint';
-      case HintActionKind.changeToNonNullableHint:
-        return 'Change to /*!*/ hint';
-    }
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/messages.dart b/pkg/nnbd_migration/lib/src/messages.dart
deleted file mode 100644
index 065d8f89407f..000000000000
--- a/pkg/nnbd_migration/lib/src/messages.dart
+++ /dev/null
@@ -1,42 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/migration_cli.dart';
-
-const String migratedAlready =
-    'All sources appear to be already migrated.  Nothing to do.';
-const String nnbdExperimentOff =
-    'Analyzer seems to need the null safety experiment on in the SDK.';
-const String sdkNnbdOff =
-    'Analysis seems to have an SDK without null safety enabled.';
-const String sdkPathEnvironmentVariableSet =
-    r'Note: $SDK_PATH environment variable is set and may point to outdated '
-    'dart:core sources';
-const String unmigratedDependenciesWarning = '''
-Warning: package has unmigrated dependencies.
-
-Continuing due to the presence of `$_skipImportCheckFlag`.  To see a complete
-list of the unmigrated dependencies, re-run without the `$_skipImportCheckFlag`
-flag.
-''';
-const String _skipImportCheckFlag =
-    '--${CommandLineOptions.skipImportCheckFlag}';
-
-String unmigratedDependenciesError(List uris) => '''
-Error: package has unmigrated dependencies.
-
-Before migrating your package, we recommend ensuring that every library it
-imports (either directly or indirectly) has been migrated to null safety, so
-that you will be able to run your unit tests in sound null checking mode.  You
-are currently importing the following non-null-safe libraries:
-
-  ${uris.join('\n  ')}
-
-Please upgrade the packages containing these libraries to null safe versions
-before continuing.  To see what null safe package versions are available, run
-the following command: `dart pub outdated --mode=null-safety`.
-
-To skip this check and try to migrate anyway, re-run with the flag
-`$_skipImportCheckFlag`.
-''';
diff --git a/pkg/nnbd_migration/lib/src/node_builder.dart b/pkg/nnbd_migration/lib/src/node_builder.dart
deleted file mode 100644
index 7d40f0ce3927..000000000000
--- a/pkg/nnbd_migration/lib/src/node_builder.dart
+++ /dev/null
@@ -1,1040 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/visitor.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/nullability_suffix.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/hint_action.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:nnbd_migration/src/nullability_node_target.dart';
-import 'package:nnbd_migration/src/utilities/completeness_tracker.dart';
-import 'package:nnbd_migration/src/utilities/hint_utils.dart';
-import 'package:nnbd_migration/src/utilities/permissive_mode.dart';
-import 'package:nnbd_migration/src/utilities/resolution_utils.dart';
-import 'package:nnbd_migration/src/variables.dart';
-
-import 'edge_origin.dart';
-
-/// Visitor that builds nullability nodes based on visiting code to be migrated.
-///
-/// The return type of each `visit...` method is a [DecoratedType] indicating
-/// the static type of the element declared by the visited node, along with the
-/// constraint variables that will determine its nullability.  For `visit...`
-/// methods that don't visit declarations, `null` will be returned.
-class NodeBuilder extends GeneralizingAstVisitor
-    with
-        PermissiveModeVisitor,
-        CompletenessTracker {
-  /// Constraint variables and decorated types are stored here.
-  final Variables _variables;
-
-  @override
-  final Source? source;
-
-  /// If the parameters of a function or method are being visited, the
-  /// [DecoratedType]s of the function's named parameters that have been seen so
-  /// far.  Otherwise `null`.
-  Map? _namedParameters;
-
-  /// If the parameters of a function or method are being visited, the
-  /// [DecoratedType]s of the function's positional parameters that have been
-  /// seen so far.  Otherwise `null`.
-  List? _positionalParameters;
-
-  /// If the child types of a node are being visited, the
-  /// [NullabilityNodeTarget] that should be used in [visitTypeAnnotation].
-  /// Otherwise `null`.
-  NullabilityNodeTarget? _target;
-
-  /// [ClassDeclaration] for the current class or `null` if we are currently
-  /// not inside a class declaration.
-  ClassDeclaration? _classDeclaration;
-
-  final NullabilityMigrationListener? listener;
-
-  final NullabilityMigrationInstrumentation? instrumentation;
-
-  final NullabilityGraph _graph;
-
-  final TypeProvider _typeProvider;
-
-  /// Indicates whether the declaration currently being visited is marked
-  /// `external`.
-  bool _visitingExternalDeclaration = false;
-
-  NodeBuilder(this._variables, this.source, this.listener, this._graph,
-      this._typeProvider,
-      {this.instrumentation});
-
-  NullabilityNodeTarget get safeTarget {
-    var target = _target;
-    if (target != null) return target;
-    assert(false, 'Unknown nullability node target');
-    return NullabilityNodeTarget.text('unknown');
-  }
-
-  bool get _isInjectable =>
-      _classDeclaration?.metadata
-          .any((ann) => _isAngularConstructor(ann.element, 'Injectable')) ??
-      false;
-  bool get _isInsideAngularComponent =>
-      _classDeclaration?.metadata
-          .toList()
-          .any((ann) => _isAngularConstructor(ann.element, 'Component')) ??
-      false;
-
-  @override
-  DecoratedType? visitAsExpression(AsExpression node) {
-    node.expression.accept(this);
-    _pushNullabilityNodeTarget(
-        NullabilityNodeTarget.text('cast type'), () => node.type.accept(this));
-    return null;
-  }
-
-  @override
-  DecoratedType? visitCatchClause(CatchClause node) {
-    var exceptionElement = node.exceptionParameter?.declaredElement;
-    var target = exceptionElement == null
-        ? NullabilityNodeTarget.text('exception type')
-        : NullabilityNodeTarget.element(exceptionElement);
-    DecoratedType? exceptionType = _pushNullabilityNodeTarget(
-        target, () => node.exceptionType?.accept(this));
-    if (node.exceptionParameter != null) {
-      // If there is no `on Type` part of the catch clause, the type is dynamic.
-      if (exceptionType == null) {
-        exceptionType = DecoratedType.forImplicitType(_typeProvider,
-            _typeProvider.dynamicType, _graph, target.withCodeRef(node));
-        instrumentation?.implicitType(
-            source, node.exceptionParameter, exceptionType);
-      }
-      _variables.recordDecoratedElementType(
-          node.exceptionParameter?.declaredElement, exceptionType);
-    }
-    if (node.stackTraceParameter != null) {
-      // The type of stack traces is always StackTrace (non-nullable).
-      var target = NullabilityNodeTarget.text('stack trace').withCodeRef(node);
-      var nullabilityNode = NullabilityNode.forInferredType(target);
-      _graph.makeNonNullableUnion(nullabilityNode,
-          StackTraceTypeOrigin(source, node.stackTraceParameter));
-      var stackTraceType =
-          DecoratedType(_typeProvider.stackTraceType, nullabilityNode);
-      _variables.recordDecoratedElementType(
-          node.stackTraceParameter?.declaredElement, stackTraceType);
-      instrumentation?.implicitType(
-          source, node.stackTraceParameter, stackTraceType);
-    }
-    node.stackTraceParameter?.accept(this);
-    node.body.accept(this);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitClassDeclaration(ClassDeclaration node) {
-    node.metadata.accept(this);
-    node.typeParameters?.accept(this);
-    node.nativeClause?.accept(this);
-    _classDeclaration = node;
-    node.members.accept(this);
-    _classDeclaration = null;
-    var classElement = node.declaredElement!;
-    _handleSupertypeClauses(node, classElement, node.extendsClause?.superclass,
-        node.withClause, node.implementsClause, null);
-    var constructors = classElement.constructors;
-    if (constructors.length == 1) {
-      var constructorElement = constructors[0];
-      if (constructorElement.isSynthetic) {
-        // Need to create a decorated type for the default constructor.
-        var decoratedReturnType =
-            _createDecoratedTypeForClass(classElement, node);
-        var functionType = DecoratedType(constructorElement.type, _graph.never,
-            returnType: decoratedReturnType,
-            positionalParameters: const [],
-            namedParameters: {});
-        _variables.recordDecoratedElementType(constructorElement, functionType);
-      }
-    }
-    return null;
-  }
-
-  @override
-  DecoratedType? visitClassTypeAlias(ClassTypeAlias node) {
-    node.metadata.accept(this);
-    node.typeParameters?.accept(this);
-    var classElement = node.declaredElement!;
-    _handleSupertypeClauses(node, classElement, node.superclass,
-        node.withClause, node.implementsClause, null);
-    for (var constructorElement in classElement.constructors) {
-      assert(constructorElement.isSynthetic);
-      var decoratedReturnType =
-          _createDecoratedTypeForClass(classElement, node);
-      var target = NullabilityNodeTarget.element(constructorElement);
-      var functionType = DecoratedType.forImplicitFunction(
-          _typeProvider, constructorElement.type, _graph.never, _graph, target,
-          returnType: decoratedReturnType);
-      _variables.recordDecoratedElementType(constructorElement, functionType);
-      for (var parameter in constructorElement.parameters) {
-        var parameterType = DecoratedType.forImplicitType(
-            _typeProvider, parameter.type, _graph, target);
-        _variables.recordDecoratedElementType(parameter, parameterType);
-      }
-    }
-    return null;
-  }
-
-  @override
-  DecoratedType? visitCompilationUnit(CompilationUnit node) {
-    _graph.migrating(node.declaredElement!.library.source);
-    _graph.migrating(node.declaredElement!.source);
-    return super.visitCompilationUnit(node);
-  }
-
-  @override
-  DecoratedType? visitConstructorDeclaration(ConstructorDeclaration node) {
-    _handleExecutableDeclaration(
-        node,
-        node.declaredElement!,
-        node.metadata,
-        null,
-        null,
-        node.parameters,
-        node.initializers,
-        node.body,
-        node.redirectedConstructor,
-        isExternal: node.externalKeyword != null);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitConstructorName(ConstructorName node) {
-    _pushNullabilityNodeTarget(NullabilityNodeTarget.text('constructed type'),
-        () => node.type.accept(this));
-    node.name?.accept(this);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitDeclaredIdentifier(DeclaredIdentifier node) {
-    node.metadata.accept(this);
-    var declaredElement = node.declaredElement!;
-    var target = NullabilityNodeTarget.element(declaredElement);
-    DecoratedType? type =
-        _pushNullabilityNodeTarget(target, () => node.type?.accept(this));
-    if (type == null) {
-      type = DecoratedType.forImplicitType(
-          _typeProvider, declaredElement.type, _graph, target);
-      instrumentation?.implicitType(source, node, type);
-    }
-    _variables.recordDecoratedElementType(node.declaredElement, type);
-    return type;
-  }
-
-  @override
-  DecoratedType? visitDefaultFormalParameter(DefaultFormalParameter node) {
-    var decoratedType = node.parameter.accept(this);
-    var hint = getPrefixHint(node.firstTokenAfterCommentAndMetadata!);
-    if (node.defaultValue != null) {
-      node.defaultValue!.accept(this);
-      return null;
-    } else if (node.declaredElement!.hasRequired) {
-      return null;
-    } else if (hint != null && hint.kind == HintCommentKind.required) {
-      _variables.recordRequiredHint(source, node, hint);
-      return null;
-    }
-    if (decoratedType == null) {
-      throw StateError('No type computed for ${node.parameter.runtimeType} '
-          '(${node.parent!.parent!.toSource()}) offset=${node.offset}');
-    }
-    decoratedType.node.trackPossiblyOptional();
-    return null;
-  }
-
-  @override
-  DecoratedType? visitEnumDeclaration(EnumDeclaration node) {
-    node.metadata.accept(this);
-    var classElement = node.declaredElement!;
-    _variables.recordDecoratedElementType(
-        classElement, DecoratedType(classElement.thisType, _graph.never));
-
-    makeNonNullNode(NullabilityNodeTarget target, [AstNode? forNode]) {
-      forNode ??= node;
-      final graphNode = NullabilityNode.forInferredType(target);
-      _graph.makeNonNullableUnion(graphNode, EnumValueOrigin(source, forNode));
-      return graphNode;
-    }
-
-    for (var item in node.constants) {
-      var declaredElement = item.declaredElement!;
-      var target = NullabilityNodeTarget.element(declaredElement);
-      _variables.recordDecoratedElementType(declaredElement,
-          DecoratedType(classElement.thisType, makeNonNullNode(target, item)));
-    }
-    final valuesGetter = classElement.getGetter('values')!;
-    var valuesTarget = NullabilityNodeTarget.element(valuesGetter);
-    _variables.recordDecoratedElementType(
-        valuesGetter,
-        DecoratedType(valuesGetter.type, makeNonNullNode(valuesTarget),
-            returnType: DecoratedType(valuesGetter.returnType,
-                makeNonNullNode(valuesTarget.returnType()),
-                typeArguments: [
-                  DecoratedType(classElement.thisType,
-                      makeNonNullNode(valuesTarget.typeArgument(0)))
-                ])));
-    return null;
-  }
-
-  @override
-  DecoratedType? visitExtensionDeclaration(ExtensionDeclaration node) {
-    node.metadata.accept(this);
-    node.typeParameters?.accept(this);
-    var type = _pushNullabilityNodeTarget(
-        NullabilityNodeTarget.text('extended type'),
-        () => node.extendedType.accept(this));
-    _variables.recordDecoratedElementType(node.declaredElement, type);
-    node.members.accept(this);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitFieldFormalParameter(FieldFormalParameter node) {
-    return _handleFormalParameter(
-        node, node.type, node.typeParameters, node.parameters);
-  }
-
-  @override
-  DecoratedType? visitFormalParameterList(FormalParameterList node) {
-    int index = 0;
-    for (var parameter in node.parameters) {
-      var element = parameter.declaredElement!;
-      NullabilityNodeTarget newTarget;
-      if (element.isNamed) {
-        newTarget = safeTarget.namedParameter(element.name);
-      } else {
-        newTarget = safeTarget.positionalParameter(index++);
-      }
-      _pushNullabilityNodeTarget(newTarget, () => parameter.accept(this));
-    }
-    return null;
-  }
-
-  @override
-  DecoratedType? visitFunctionDeclaration(FunctionDeclaration node) {
-    _handleExecutableDeclaration(
-        node,
-        node.declaredElement!,
-        node.metadata,
-        node.returnType,
-        node.functionExpression.typeParameters,
-        node.functionExpression.parameters,
-        null,
-        node.functionExpression.body,
-        null,
-        isExternal: node.externalKeyword != null);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitFunctionExpression(FunctionExpression node) {
-    _handleExecutableDeclaration(node, node.declaredElement!, null, null,
-        node.typeParameters, node.parameters, null, node.body, null,
-        isExternal: false);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitFunctionExpressionInvocation(
-      FunctionExpressionInvocation node) {
-    node.function.accept(this);
-    _pushNullabilityNodeTarget(NullabilityNodeTarget.text('type argument'),
-        () => node.typeArguments?.accept(this));
-    node.argumentList.accept(this);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitFunctionTypeAlias(FunctionTypeAlias node) {
-    node.metadata.accept(this);
-    var declaredElement = node.declaredElement!;
-    var functionElement =
-        declaredElement.aliasedElement as GenericFunctionTypeElement;
-    var functionType = functionElement.type;
-    var returnType = node.returnType;
-    DecoratedType? decoratedReturnType;
-    var target = NullabilityNodeTarget.element(declaredElement);
-    if (returnType != null) {
-      _pushNullabilityNodeTarget(target.returnType(), () {
-        decoratedReturnType = returnType.accept(this);
-      });
-    } else {
-      // Inferred return type.
-      decoratedReturnType = DecoratedType.forImplicitType(
-          _typeProvider, functionType.returnType, _graph, target.returnType());
-      instrumentation?.implicitReturnType(source, node, decoratedReturnType);
-    }
-    var previousPositionalParameters = _positionalParameters;
-    var previousNamedParameters = _namedParameters;
-    _positionalParameters = [];
-    _namedParameters = {};
-    DecoratedType decoratedFunctionType;
-    try {
-      node.typeParameters?.accept(this);
-      _pushNullabilityNodeTarget(target, () => node.parameters.accept(this));
-      // Note: we don't pass _typeFormalBounds into DecoratedType because we're
-      // not defining a generic function type, we're defining a generic typedef
-      // of an ordinary (non-generic) function type.
-      decoratedFunctionType = DecoratedType(functionType, _graph.never,
-          returnType: decoratedReturnType,
-          positionalParameters: _positionalParameters,
-          namedParameters: _namedParameters);
-    } finally {
-      _positionalParameters = previousPositionalParameters;
-      _namedParameters = previousNamedParameters;
-    }
-    _variables.recordDecoratedElementType(
-        functionElement, decoratedFunctionType);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitFunctionTypedFormalParameter(
-      FunctionTypedFormalParameter node) {
-    return _handleFormalParameter(
-        node, node.returnType, node.typeParameters, node.parameters);
-  }
-
-  @override
-  DecoratedType? visitGenericTypeAlias(GenericTypeAlias node) {
-    node.metadata.accept(this);
-    DecoratedType? decoratedFunctionType;
-    node.typeParameters?.accept(this);
-    var target = NullabilityNodeTarget.element(node.declaredElement!);
-    _pushNullabilityNodeTarget(target, () {
-      decoratedFunctionType = node.functionType!.accept(this);
-    });
-    _variables.recordDecoratedElementType(
-        (node.declaredElement as TypeAliasElement).aliasedElement,
-        decoratedFunctionType);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitIsExpression(IsExpression node) {
-    node.expression.accept(this);
-    _pushNullabilityNodeTarget(NullabilityNodeTarget.text('tested type'),
-        () => node.type.accept(this));
-    return null;
-  }
-
-  @override
-  DecoratedType? visitListLiteral(ListLiteral node) {
-    _pushNullabilityNodeTarget(NullabilityNodeTarget.text('list element type'),
-        () => node.typeArguments?.accept(this));
-    node.elements.accept(this);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitMethodDeclaration(MethodDeclaration node) {
-    var declaredElement = node.declaredElement;
-    var decoratedType = _handleExecutableDeclaration(
-        node,
-        declaredElement!,
-        node.metadata,
-        node.returnType,
-        node.typeParameters,
-        node.parameters,
-        null,
-        node.body,
-        null,
-        isExternal: node.externalKeyword != null);
-    if (declaredElement is PropertyAccessorElement) {
-      // Store a decorated type for the synthetic field so that in case we try
-      // to access it later we won't crash (this could happen due to errors in
-      // the source code).
-      if (declaredElement.isGetter) {
-        _variables.recordDecoratedElementType(
-            declaredElement.variable, decoratedType.returnType);
-      } else {
-        var type = decoratedType.positionalParameters![0];
-        _variables.recordDecoratedElementType(declaredElement.variable, type,
-            soft: true);
-        if (_getAngularAnnotation(node.metadata) == _AngularAnnotation.child) {
-          _graph.makeNullable(type.node, AngularAnnotationOrigin(source, node));
-        }
-      }
-    }
-    return null;
-  }
-
-  @override
-  DecoratedType? visitMethodInvocation(MethodInvocation node) {
-    node.target?.accept(this);
-    node.methodName.accept(this);
-    _pushNullabilityNodeTarget(NullabilityNodeTarget.text('type argument'),
-        () => node.typeArguments?.accept(this));
-    node.argumentList.accept(this);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitMixinDeclaration(MixinDeclaration node) {
-    node.metadata.accept(this);
-    node.typeParameters?.accept(this);
-    node.members.accept(this);
-    _handleSupertypeClauses(node, node.declaredElement!, null, null,
-        node.implementsClause, node.onClause);
-    return null;
-  }
-
-  @override
-  DecoratedType visitNamedType(NamedType node) {
-    namedTypeVisited(node); // Note this has been visited to NamedTypeTracker.
-    return visitTypeAnnotation(node);
-  }
-
-  @override
-  DecoratedType? visitSetOrMapLiteral(SetOrMapLiteral node) {
-    var typeArguments = node.typeArguments;
-    if (typeArguments != null) {
-      var arguments = typeArguments.arguments;
-      if (arguments.length == 2) {
-        _pushNullabilityNodeTarget(NullabilityNodeTarget.text('map key type'),
-            () => arguments[0].accept(this));
-        _pushNullabilityNodeTarget(NullabilityNodeTarget.text('map value type'),
-            () => arguments[1].accept(this));
-      } else {
-        _pushNullabilityNodeTarget(
-            NullabilityNodeTarget.text('set element type'),
-            () => typeArguments.accept(this));
-      }
-    }
-    node.elements.accept(this);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitSimpleFormalParameter(SimpleFormalParameter node) {
-    return _handleFormalParameter(node, node.type, null, null);
-  }
-
-  @override
-  DecoratedType visitTypeAnnotation(TypeAnnotation node) {
-    var type = node.type!;
-    var target = safeTarget.withCodeRef(node);
-    if (type is VoidType || type is DynamicType) {
-      var nullabilityNode = NullabilityNode.forTypeAnnotation(target);
-      var decoratedType = DecoratedType(type, nullabilityNode);
-      _variables.recordDecoratedTypeAnnotation(source, node, decoratedType);
-      if (_visitingExternalDeclaration) {
-        _graph.makeNullableUnion(
-            nullabilityNode, ExternalDynamicOrigin(source, node));
-      }
-      return decoratedType;
-    }
-    var typeArguments = const [];
-    DecoratedType? decoratedReturnType;
-    List positionalParameters = const [];
-    Map namedParameters =
-        const {};
-    if (type is InterfaceType && type.element.typeParameters.isNotEmpty) {
-      if (node is NamedType) {
-        if (node.typeArguments == null) {
-          int index = 0;
-          typeArguments = type.typeArguments
-              .map((t) => DecoratedType.forImplicitType(
-                  _typeProvider, t, _graph, target.typeArgument(index++)))
-              .toList();
-          instrumentation?.implicitTypeArguments(source, node, typeArguments);
-        } else {
-          int index = 0;
-          typeArguments = node.typeArguments!.arguments
-              .map((t) => _pushNullabilityNodeTarget(
-                  target.typeArgument(index++), () => t.accept(this)!))
-              .toList();
-        }
-      } else {
-        assert(false); // TODO(paulberry): is this possible?
-      }
-    }
-    if (node is GenericFunctionType) {
-      var returnType = node.returnType;
-      if (returnType == null) {
-        decoratedReturnType = DecoratedType.forImplicitType(_typeProvider,
-            DynamicTypeImpl.instance, _graph, target.returnType());
-        instrumentation?.implicitReturnType(source, node, decoratedReturnType);
-      } else {
-        // If [_target] is non-null, then it represents the return type for
-        // a FunctionTypeAlias. Otherwise, create a return type target for
-        // `target`.
-        _pushNullabilityNodeTarget(target.returnType(), () {
-          decoratedReturnType = returnType.accept(this);
-        });
-      }
-      positionalParameters = [];
-      namedParameters = {};
-      var previousPositionalParameters = _positionalParameters;
-      var previousNamedParameters = _namedParameters;
-      try {
-        _positionalParameters = positionalParameters;
-        _namedParameters = namedParameters;
-        node.typeParameters?.accept(this);
-        node.parameters.accept(this);
-      } finally {
-        _positionalParameters = previousPositionalParameters;
-        _namedParameters = previousNamedParameters;
-      }
-    }
-    NullabilityNode nullabilityNode;
-    if (typeIsNonNullableByContext(node)) {
-      nullabilityNode = _graph.never;
-    } else {
-      nullabilityNode = NullabilityNode.forTypeAnnotation(target);
-      nullabilityNode.hintActions
-        ..[HintActionKind.addNullableHint] = {
-          node.end: [AtomicEdit.insert('/*?*/')]
-        }
-        ..[HintActionKind.addNonNullableHint] = {
-          node.end: [AtomicEdit.insert('/*!*/')]
-        };
-    }
-    DecoratedType decoratedType;
-    if (type is FunctionType && node is! GenericFunctionType) {
-      (node as NamedType).typeArguments?.accept(this);
-      // node is a reference to a typedef.  Treat it like an inferred type (we
-      // synthesize new nodes for it).  These nodes will be unioned with the
-      // typedef nodes by the edge builder.
-      decoratedType = DecoratedType.forImplicitFunction(
-          _typeProvider, type, nullabilityNode, _graph, target);
-    } else {
-      decoratedType = DecoratedType(type, nullabilityNode,
-          typeArguments: typeArguments,
-          returnType: decoratedReturnType,
-          positionalParameters: positionalParameters,
-          namedParameters: namedParameters);
-    }
-    _variables.recordDecoratedTypeAnnotation(source, node, decoratedType);
-    _handleNullabilityHint(node, decoratedType);
-    return decoratedType;
-  }
-
-  @override
-  DecoratedType? visitTypeParameter(TypeParameter node) {
-    var element = node.declaredElement!;
-    var bound = node.bound;
-    DecoratedType? decoratedBound;
-    var target = NullabilityNodeTarget.typeParameterBound(element);
-    if (bound != null) {
-      decoratedBound =
-          _pushNullabilityNodeTarget(target, () => bound.accept(this));
-    } else {
-      var nullabilityNode = NullabilityNode.forInferredType(target);
-      decoratedBound = DecoratedType(_typeProvider.objectType, nullabilityNode);
-      _graph.connect(_graph.always, nullabilityNode,
-          AlwaysNullableTypeOrigin.forElement(element, false));
-    }
-    DecoratedTypeParameterBounds.current!.put(element, decoratedBound);
-    return null;
-  }
-
-  @override
-  DecoratedType? visitVariableDeclarationList(VariableDeclarationList node) {
-    node.metadata.accept(this);
-    var typeAnnotation = node.type;
-    var declaredType = _pushNullabilityNodeTarget(
-        NullabilityNodeTarget.element(node.variables.first.declaredElement!),
-        () => typeAnnotation?.accept(this));
-    var hint = getPrefixHint(node.firstTokenAfterCommentAndMetadata);
-    if (hint != null && hint.kind == HintCommentKind.late_) {
-      _variables.recordLateHint(source, node, hint);
-    }
-    if (hint != null && hint.kind == HintCommentKind.lateFinal) {
-      _variables.recordLateHint(source, node, hint);
-    }
-    var parent = node.parent;
-    for (var variable in node.variables) {
-      variable.metadata.accept(this);
-      var declaredElement = variable.declaredElement;
-      var type = declaredType;
-      if (type == null) {
-        var target = NullabilityNodeTarget.element(declaredElement!);
-        type = DecoratedType.forImplicitType(
-            _typeProvider, declaredElement.type, _graph, target);
-        instrumentation?.implicitType(source, node, type);
-      }
-      _variables.recordDecoratedElementType(declaredElement, type);
-      variable.initializer?.accept(this);
-      if (parent is FieldDeclaration) {
-        var angularAnnotation = _getAngularAnnotation(parent.metadata);
-        if (angularAnnotation != null) {
-          switch (angularAnnotation) {
-            case _AngularAnnotation.child:
-              _graph.makeNullable(
-                  type.node, AngularAnnotationOrigin(source, node));
-              break;
-            case _AngularAnnotation.children:
-              _graph.preventLate(
-                  type.node, AngularAnnotationOrigin(source, node));
-              break;
-          }
-        }
-      }
-    }
-    return null;
-  }
-
-  DecoratedType _createDecoratedTypeForClass(
-      InterfaceElement classElement, AstNode? node) {
-    var typeArguments = classElement.typeParameters
-        .map((t) => t.instantiate(nullabilitySuffix: NullabilitySuffix.star))
-        .toList();
-    var decoratedTypeArguments =
-        typeArguments.map((t) => DecoratedType(t, _graph.never)).toList();
-    return DecoratedType(
-      classElement.instantiate(
-        typeArguments: typeArguments,
-        nullabilitySuffix: NullabilitySuffix.star,
-      ),
-      _graph.never,
-      typeArguments: decoratedTypeArguments,
-    );
-  }
-
-  /// Determines if the given [metadata] contains a reference to one of the
-  /// Angular annotations that we have special behaviors for.  If it does,
-  /// returns an enumerated value describing the type of annotation.
-  _AngularAnnotation? _getAngularAnnotation(NodeList metadata) {
-    for (var annotation in metadata) {
-      var element = annotation.element;
-      if (element is ConstructorElement) {
-        var name = element.enclosingElement.name;
-        if (_isAngularUri(element.librarySource.uri)) {
-          if (name == 'ViewChild' || name == 'ContentChild') {
-            return _AngularAnnotation.child;
-          } else if (name == 'ViewChildren' || name == 'ContentChildren') {
-            return _AngularAnnotation.children;
-          }
-        }
-      }
-    }
-    return null;
-  }
-
-  /// Common handling of function and method declarations.
-  DecoratedType _handleExecutableDeclaration(
-      AstNode node,
-      ExecutableElement declaredElement,
-      NodeList? metadata,
-      TypeAnnotation? returnType,
-      TypeParameterList? typeParameters,
-      FormalParameterList? parameters,
-      NodeList? initializers,
-      FunctionBody body,
-      ConstructorName? redirectedConstructor,
-      {required bool isExternal}) {
-    metadata?.accept(this);
-    var previouslyVisitingExternalDeclaration = _visitingExternalDeclaration;
-    try {
-      if (isExternal) {
-        _visitingExternalDeclaration = true;
-      }
-      var functionType = declaredElement.type;
-      DecoratedType? decoratedReturnType;
-      var target = NullabilityNodeTarget.element(declaredElement);
-      if (returnType != null) {
-        _pushNullabilityNodeTarget(target.returnType(), () {
-          decoratedReturnType = returnType.accept(this);
-        });
-      } else if (declaredElement is ConstructorElement) {
-        // Constructors have no explicit return type annotation, so use the
-        // implicit return type.
-        decoratedReturnType = _createDecoratedTypeForClass(
-            declaredElement.enclosingElement, parameters!.parent);
-        instrumentation?.implicitReturnType(source, node, decoratedReturnType);
-      } else {
-        // If the function expression just throws, analyzer will infer `Null`
-        // return type is legacy mode. This causes unnecessary casts at the
-        // fix generation phase. So change it back to `Never`.
-        if (body is ExpressionFunctionBody &&
-            body.expression is ThrowExpression &&
-            functionType.returnType == _typeProvider.nullType) {
-          functionType = FunctionTypeImpl(
-              typeFormals: functionType.typeFormals,
-              parameters: functionType.parameters,
-              returnType: _typeProvider.neverType,
-              nullabilitySuffix: functionType.nullabilitySuffix);
-        }
-        // Inferred return type.
-        decoratedReturnType = DecoratedType.forImplicitType(
-            _typeProvider, functionType.returnType, _graph, target);
-        instrumentation?.implicitReturnType(source, node, decoratedReturnType);
-        if (isExternal && functionType.returnType is DynamicType) {
-          _graph.makeNullableUnion(
-              decoratedReturnType.node, ExternalDynamicOrigin(source, node));
-        }
-      }
-      var previousPositionalParameters = _positionalParameters;
-      var previousNamedParameters = _namedParameters;
-      _positionalParameters = [];
-      _namedParameters = {};
-      DecoratedType decoratedFunctionType;
-      try {
-        typeParameters?.accept(this);
-        _pushNullabilityNodeTarget(target, () => parameters?.accept(this));
-        redirectedConstructor?.accept(this);
-        initializers?.accept(this);
-        decoratedFunctionType = DecoratedType(functionType, _graph.never,
-            returnType: decoratedReturnType,
-            positionalParameters: _positionalParameters,
-            namedParameters: _namedParameters);
-        body.accept(this);
-      } finally {
-        _positionalParameters = previousPositionalParameters;
-        _namedParameters = previousNamedParameters;
-      }
-      _variables.recordDecoratedElementType(
-          declaredElement, decoratedFunctionType);
-      return decoratedFunctionType;
-    } finally {
-      _visitingExternalDeclaration = previouslyVisitingExternalDeclaration;
-    }
-  }
-
-  DecoratedType? _handleFormalParameter(
-      FormalParameter node,
-      TypeAnnotation? type,
-      TypeParameterList? typeParameters,
-      FormalParameterList? parameters) {
-    var declaredElement = node.declaredElement!;
-    node.metadata.accept(this);
-    DecoratedType? decoratedType;
-    var target = safeTarget;
-    if (parameters == null) {
-      if (type != null) {
-        decoratedType = type.accept(this);
-      } else {
-        decoratedType = DecoratedType.forImplicitType(
-            _typeProvider, declaredElement.type, _graph, target);
-        if (_visitingExternalDeclaration) {
-          _graph.makeNullableUnion(
-              decoratedType.node, ExternalDynamicOrigin(source, node));
-        }
-        instrumentation?.implicitType(source, node, decoratedType);
-      }
-    } else {
-      DecoratedType? decoratedReturnType;
-      if (type == null) {
-        decoratedReturnType = DecoratedType.forImplicitType(_typeProvider,
-            DynamicTypeImpl.instance, _graph, target.returnType());
-        instrumentation?.implicitReturnType(source, node, decoratedReturnType);
-        if (_visitingExternalDeclaration) {
-          _graph.makeNullableUnion(
-              decoratedReturnType.node, ExternalDynamicOrigin(source, node));
-        }
-      } else {
-        decoratedReturnType = type.accept(this);
-      }
-      if (typeParameters != null) {
-        // TODO(paulberry)
-        _unimplemented(
-            typeParameters, 'Function-typed parameter with type parameters');
-      }
-      var positionalParameters = [];
-      var namedParameters = {};
-      var previousPositionalParameters = _positionalParameters;
-      var previousNamedParameters = _namedParameters;
-      try {
-        _positionalParameters = positionalParameters;
-        _namedParameters = namedParameters;
-        parameters.accept(this);
-      } finally {
-        _positionalParameters = previousPositionalParameters;
-        _namedParameters = previousNamedParameters;
-      }
-      final nullabilityNode = NullabilityNode.forTypeAnnotation(target);
-      decoratedType = DecoratedType(declaredElement.type, nullabilityNode,
-          returnType: decoratedReturnType,
-          positionalParameters: positionalParameters,
-          namedParameters: namedParameters);
-      _handleNullabilityHint(node, decoratedType);
-    }
-    _variables.recordDecoratedElementType(declaredElement, decoratedType);
-    var isAnnotated = false;
-    for (var annotation in node.metadata) {
-      var element = annotation.element;
-      if (_isAngularConstructor(element, 'Optional') ||
-          _isAngularConstructor(element, 'Attribute')) {
-        isAnnotated = true;
-        if (_isAngularConstructor(element, 'Optional') ||
-            _isInsideAngularComponent) {
-          _graph.makeNullable(
-              decoratedType!.node, AngularAnnotationOrigin(source, node));
-        }
-      }
-    }
-    final enclosingElement = declaredElement.enclosingElement;
-    if ((enclosingElement is ConstructorElement &&
-                (_isInsideAngularComponent || _isInjectable) ||
-            (enclosingElement is FunctionElement) &&
-                _hasInjectable(enclosingElement)) &&
-        !isAnnotated) {
-      _graph.makeNonNullable(
-          decoratedType!.node, AngularConstructorArgumentOrigin(source, node));
-    }
-
-    if (declaredElement.isNamed) {
-      _namedParameters![declaredElement.name] = decoratedType!;
-    } else {
-      _positionalParameters!.add(decoratedType!);
-    }
-    return decoratedType;
-  }
-
-  /// Nullability hints can be added to [TypeAnnotation]s,
-  /// [FunctionTypedFormalParameter]s, and function-typed
-  /// [FieldFormalParameter]s.
-  void _handleNullabilityHint(AstNode node, DecoratedType decoratedType) {
-    assert(node is TypeAnnotation ||
-        node is FunctionTypedFormalParameter ||
-        (node is FieldFormalParameter && node.parameters != null));
-    var hint = getPostfixHint(node.endToken);
-    if (hint != null) {
-      switch (hint.kind) {
-        case HintCommentKind.bang:
-          _graph.makeNonNullableUnion(decoratedType.node,
-              NullabilityCommentOrigin(source, node, false));
-          _variables.recordNullabilityHint(source, node, hint);
-          decoratedType.node.hintActions[HintActionKind.removeNonNullableHint] =
-              hint.changesToRemove(source!.contents.data);
-          decoratedType.node.hintActions[HintActionKind.changeToNullableHint] =
-              hint.changesToReplace(source!.contents.data, '/*?*/');
-          break;
-        case HintCommentKind.question:
-          _graph.makeNullableUnion(
-              decoratedType.node, NullabilityCommentOrigin(source, node, true));
-          _variables.recordNullabilityHint(source, node, hint);
-          decoratedType.node.hintActions[HintActionKind.removeNullableHint] =
-              hint.changesToRemove(source!.contents.data);
-          decoratedType
-                  .node.hintActions[HintActionKind.changeToNonNullableHint] =
-              hint.changesToReplace(source!.contents.data, '/*!*/');
-          break;
-        default:
-          break;
-      }
-
-      decoratedType.node.hintActions
-        ..remove(HintActionKind.addNonNullableHint)
-        ..remove(HintActionKind.addNullableHint);
-    }
-  }
-
-  void _handleSupertypeClauses(
-      NamedCompilationUnitMember astNode,
-      InterfaceElement declaredElement,
-      NamedType? superclass,
-      WithClause? withClause,
-      ImplementsClause? implementsClause,
-      OnClause? onClause) {
-    var supertypes = [];
-    supertypes.add(superclass);
-    if (withClause != null) {
-      supertypes.addAll(withClause.mixinTypes);
-    }
-    if (implementsClause != null) {
-      supertypes.addAll(implementsClause.interfaces);
-    }
-    if (onClause != null) {
-      supertypes.addAll(onClause.superclassConstraints);
-    }
-    var decoratedSupertypes = {};
-    _pushNullabilityNodeTarget(
-        NullabilityNodeTarget.element(declaredElement).supertype, () {
-      for (var supertype in supertypes) {
-        DecoratedType? decoratedSupertype;
-        if (supertype == null) {
-          var nullabilityNode =
-              NullabilityNode.forInferredType(_target!.withCodeRef(astNode));
-          _graph.makeNonNullableUnion(
-              nullabilityNode, NonNullableObjectSuperclass(source, astNode));
-          decoratedSupertype =
-              DecoratedType(_typeProvider.objectType, nullabilityNode);
-        } else {
-          decoratedSupertype = supertype.accept(this);
-        }
-        var class_ = (decoratedSupertype!.type as InterfaceType).element;
-        decoratedSupertypes[class_] = decoratedSupertype;
-      }
-    });
-    _variables.recordDecoratedDirectSupertypes(
-        declaredElement, decoratedSupertypes);
-  }
-
-  bool _hasInjectable(Element element) => element.metadata
-      .any((ann) => _isAngularConstructor(ann.element, 'Injectable'));
-
-  /// Determines whether [element] is a constructor named [name] from Angular
-  /// package.
-  bool _isAngularConstructor(Element? element, String name) =>
-      element is ConstructorElement &&
-      element.enclosingElement.name == name &&
-      _isAngularUri(element.librarySource.uri);
-
-  /// Determines whether the given [uri] comes from the Angular package.
-  bool _isAngularUri(Uri uri) {
-    if (!uri.isScheme('package')) return false;
-    var packageName = uri.pathSegments[0];
-    if (packageName == 'angular') return true;
-    if (packageName == 'third_party.dart_src.angular.angular') {
-      // This name is used for angular development internally at Google.
-      return true;
-    }
-    return false;
-  }
-
-  T _pushNullabilityNodeTarget(
-      NullabilityNodeTarget target, T Function() fn) {
-    NullabilityNodeTarget? previousTarget = _target;
-    try {
-      _target = target;
-      return fn();
-    } finally {
-      _target = previousTarget;
-    }
-  }
-
-  Never _unimplemented(AstNode node, String message) {
-    CompilationUnit unit = node.root as CompilationUnit;
-    StringBuffer buffer = StringBuffer();
-    buffer.write(message);
-    buffer.write(' in "');
-    buffer.write(node.toSource());
-    buffer.write('" on line ');
-    buffer.write(unit.lineInfo.getLocation(node.offset).lineNumber);
-    buffer.write(' of "');
-    buffer.write(unit.declaredElement!.source.fullName);
-    buffer.write('"');
-    throw UnimplementedError(buffer.toString());
-  }
-}
-
-/// Enum describing the kinds of annotations supplied by the angular package for
-/// which we have special migration behaviors.
-enum _AngularAnnotation {
-  /// Either the `@ViewChild` or `@ContentChild` annotation.  Fields with these
-  /// annotations should always be nullable and should never be late.
-  child,
-
-  /// Either the `@ViewChildren` or `@ContentChildren` annotation.  Fields with
-  /// these annotations should never be late.
-  children,
-}
diff --git a/pkg/nnbd_migration/lib/src/nullability_migration_impl.dart b/pkg/nnbd_migration/lib/src/nullability_migration_impl.dart
deleted file mode 100644
index cceb307ad56b..000000000000
--- a/pkg/nnbd_migration/lib/src/nullability_migration_impl.dart
+++ /dev/null
@@ -1,274 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/analysis/features.dart';
-import 'package:analyzer/dart/analysis/results.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/source/line_info.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer/src/dart/analysis/session.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/dart/element/type_system.dart';
-import 'package:analyzer_plugin/protocol/protocol_common.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/decorated_class_hierarchy.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/edge_builder.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/exceptions.dart';
-import 'package:nnbd_migration/src/fix_aggregator.dart';
-import 'package:nnbd_migration/src/fix_builder.dart';
-import 'package:nnbd_migration/src/node_builder.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:nnbd_migration/src/variables.dart';
-import 'package:pub_semver/pub_semver.dart';
-
-/// Implementation of the [NullabilityMigration] public API.
-class NullabilityMigrationImpl implements NullabilityMigration {
-  final NullabilityMigrationListener? listener;
-
-  Variables? _variables;
-
-  final NullabilityGraph _graph;
-
-  final bool? _permissive;
-
-  final NullabilityMigrationInstrumentation? _instrumentation;
-
-  DecoratedClassHierarchy? _decoratedClassHierarchy;
-
-  bool _propagated = false;
-
-  /// Indicates whether code removed by the migration engine should be removed
-  /// by commenting it out.  A value of `false` means to actually delete the
-  /// code that is removed.
-  final bool? removeViaComments;
-
-  final bool warnOnWeakCode;
-
-  final _decoratedTypeParameterBounds = DecoratedTypeParameterBounds();
-
-  /// Map from [Source] object to a boolean indicating whether the source is
-  /// opted in to null safety.
-  final Map _libraryOptInStatus = {};
-
-  /// Indicates whether the client has used the [unmigratedDependencies] getter.
-  bool _queriedUnmigratedDependencies = false;
-
-  /// Map of additional package dependencies that will be required by the
-  /// migrated code.  Keys are package names; values indicate the minimum
-  /// required version of each package.
-  final Map _neededPackages = {};
-
-  /// Prepares to perform nullability migration.
-  ///
-  /// If [permissive] is `true`, exception handling logic will try to proceed
-  /// as far as possible even though the migration algorithm is not yet
-  /// complete.  TODO(paulberry): remove this mode once the migration algorithm
-  /// is fully implemented.
-  ///
-  /// Optional parameter [removeViaComments] indicates whether code that the
-  /// migration tool wishes to remove should instead be commenting it out.
-  ///
-  /// Optional parameter [warnOnWeakCode] indicates whether weak-only code
-  /// should be warned about or removed (in the way specified by
-  /// [removeViaComments]).
-  NullabilityMigrationImpl(NullabilityMigrationListener? listener,
-      {bool? permissive = false,
-      NullabilityMigrationInstrumentation? instrumentation,
-      bool? removeViaComments = false,
-      bool warnOnWeakCode = true})
-      : this._(
-          listener,
-          NullabilityGraph(instrumentation: instrumentation),
-          permissive,
-          instrumentation,
-          removeViaComments,
-          warnOnWeakCode,
-        );
-
-  NullabilityMigrationImpl._(
-    this.listener,
-    this._graph,
-    this._permissive,
-    this._instrumentation,
-    this.removeViaComments,
-    this.warnOnWeakCode,
-  ) {
-    _instrumentation?.immutableNodes(_graph.never, _graph.always);
-  }
-
-  @override
-  bool? get isPermissive => _permissive;
-
-  @override
-  List get unmigratedDependencies {
-    _queriedUnmigratedDependencies = true;
-    var unmigratedDependencies = [];
-    for (var entry in _libraryOptInStatus.entries) {
-      if (_graph.isPathBeingMigrated(entry.key.fullName)) continue;
-      if (!entry.value) {
-        unmigratedDependencies.add(entry.key);
-      }
-    }
-    var badUris = {
-      for (var dependency in unmigratedDependencies) dependency.uri.toString()
-    }.toList();
-    badUris.sort();
-    return badUris;
-  }
-
-  @override
-  void finalizeInput(ResolvedUnitResult result) {
-    if (result.unit.featureSet.isEnabled(Feature.non_nullable)) {
-      // This library has already been migrated; nothing more to do.
-      return;
-    }
-    ExperimentStatusException.sanityCheck(result);
-    if (!_propagated) {
-      _propagated = true;
-      _graph.propagate();
-    }
-    var unit = result.unit;
-    var compilationUnit = unit.declaredElement!;
-    var library = compilationUnit.library;
-    var source = compilationUnit.source;
-    // Hierarchies were created assuming the libraries being migrated are opted
-    // out, but the FixBuilder will analyze assuming they're opted in.  So we
-    // need to clear the hierarchies before we continue.
-    (result.session as AnalysisSessionImpl).clearHierarchies();
-    var fixBuilder = FixBuilder(
-        source,
-        _decoratedClassHierarchy,
-        result.typeProvider,
-        library.typeSystem as TypeSystemImpl,
-        _variables,
-        library as LibraryElementImpl,
-        _permissive! ? listener : null,
-        unit,
-        warnOnWeakCode,
-        _graph,
-        _neededPackages);
-    try {
-      DecoratedTypeParameterBounds.current = _decoratedTypeParameterBounds;
-      fixBuilder.visitAll();
-    } finally {
-      DecoratedTypeParameterBounds.current = null;
-    }
-    var changes = FixAggregator.run(unit, result.content, fixBuilder.changes,
-        removeViaComments: removeViaComments, warnOnWeakCode: warnOnWeakCode)!;
-    _instrumentation?.changes(source, changes);
-    final lineInfo = LineInfo.fromContent(source.contents.data);
-    var offsets = changes.keys.toList();
-    offsets.sort();
-    for (var offset in offsets) {
-      var edits = changes[offset]!;
-      var descriptions = edits
-          .map((edit) => edit.info)
-          .where((info) => info != null)
-          .map((info) => info!.description.appliedMessage)
-          .join(', ');
-      var sourceEdit = edits.toSourceEdit(offset!);
-      listener!.addSuggestion(
-          descriptions, _computeLocation(lineInfo, sourceEdit, source));
-      listener!.addEdit(source, sourceEdit);
-    }
-  }
-
-  Map finish() {
-    _instrumentation?.finished();
-    return _neededPackages;
-  }
-
-  void prepareInput(ResolvedUnitResult result) {
-    assert(
-        !_queriedUnmigratedDependencies,
-        'Should only query unmigratedDependencies after all calls to '
-        'prepareInput');
-    if (result.unit.featureSet.isEnabled(Feature.non_nullable)) {
-      // This library has already been migrated; nothing more to do.
-      return;
-    }
-    ExperimentStatusException.sanityCheck(result);
-    _recordTransitiveImportExportOptInStatus(
-        result.libraryElement.importedLibraries);
-    _recordTransitiveImportExportOptInStatus(
-        result.libraryElement.exportedLibraries);
-    var variables = _variables;
-    if (variables == null) {
-      variables = _variables = Variables(_graph, result.typeProvider,
-          instrumentation: _instrumentation);
-      _decoratedClassHierarchy = DecoratedClassHierarchy(variables, _graph);
-    }
-    var unit = result.unit;
-    try {
-      DecoratedTypeParameterBounds.current = _decoratedTypeParameterBounds;
-      unit.accept(NodeBuilder(variables, unit.declaredElement!.source,
-          _permissive! ? listener : null, _graph, result.typeProvider,
-          instrumentation: _instrumentation));
-    } finally {
-      DecoratedTypeParameterBounds.current = null;
-    }
-  }
-
-  void processInput(ResolvedUnitResult result) {
-    if (result.unit.featureSet.isEnabled(Feature.non_nullable)) {
-      // This library has already been migrated; nothing more to do.
-      return;
-    }
-    ExperimentStatusException.sanityCheck(result);
-    var unit = result.unit;
-    try {
-      DecoratedTypeParameterBounds.current = _decoratedTypeParameterBounds;
-      unit.accept(EdgeBuilder(
-          result.typeProvider,
-          result.typeSystem,
-          _variables!,
-          _graph,
-          unit.declaredElement!.source,
-          _permissive! ? listener : null,
-          _decoratedClassHierarchy,
-          result.libraryElement,
-          instrumentation: _instrumentation));
-    } finally {
-      DecoratedTypeParameterBounds.current = null;
-    }
-  }
-
-  @override
-  void update() {
-    _graph.update();
-  }
-
-  /// Records the opt in/out status of all libraries in [libraries], and any
-  /// libraries they transitively import or export, in [_libraryOptInStatus].
-  void _recordTransitiveImportExportOptInStatus(
-      Iterable libraries) {
-    var librariesToCheck = libraries.toList();
-    while (librariesToCheck.isNotEmpty) {
-      var library = librariesToCheck.removeLast();
-      if (_libraryOptInStatus.containsKey(library.source)) continue;
-      _libraryOptInStatus[library.source] = library.isNonNullableByDefault;
-      librariesToCheck.addAll(library.importedLibraries);
-      librariesToCheck.addAll(library.exportedLibraries);
-    }
-  }
-
-  static Location _computeLocation(
-      LineInfo lineInfo, SourceEdit edit, Source source) {
-    final startLocation = lineInfo.getLocation(edit.offset);
-    final endLocation = lineInfo.getLocation(edit.end);
-    var location = Location(
-      source.fullName,
-      edit.offset,
-      edit.length,
-      startLocation.lineNumber,
-      startLocation.columnNumber,
-      endLine: endLocation.lineNumber,
-      endColumn: endLocation.columnNumber,
-    );
-    return location;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/nullability_node.dart b/pkg/nnbd_migration/lib/src/nullability_node.dart
deleted file mode 100644
index 04890c7b2e44..000000000000
--- a/pkg/nnbd_migration/lib/src/nullability_node.dart
+++ /dev/null
@@ -1,1181 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:collection';
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:meta/meta.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/nullability_state.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/hint_action.dart';
-import 'package:nnbd_migration/src/nullability_node_target.dart';
-
-import 'edge_origin.dart';
-
-/// Base class for steps that occur as part of downstream propagation, where the
-/// nullability of a node is changed to a new state.
-abstract class DownstreamPropagationStep extends PropagationStep
-    implements DownstreamPropagationStepInfo {
-  @override
-  NullabilityNodeMutable? targetNode;
-
-  /// The state that the node's nullability was changed to.
-  ///
-  /// Any propagation step that took effect should have a non-null value here.
-  /// Propagation steps that are pending but have not taken effect yet, or that
-  /// never had an effect (e.g. because an edge was not triggered) will have a
-  /// `null` value for this field.
-  Nullability? newState;
-
-  DownstreamPropagationStep();
-
-  @override
-  DownstreamPropagationStep? get principalCause;
-}
-
-/// Base class for steps that occur as part of propagating exact nullability
-/// upstream through the nullability graph.
-abstract class ExactNullablePropagationStep extends DownstreamPropagationStep {
-  ExactNullablePropagationStep();
-}
-
-/// Conditions of the "lateness" of a [NullabilityNode].
-enum LateCondition {
-  /// The associated [NullabilityNode] does not represent the type of a late
-  /// variable.
-  notLate,
-
-  /// The associated [NullabilityNode] represents the type of a late variable,
-  /// due to a `/*late*/` hint.
-  lateDueToHint,
-
-  /// The associated [NullabilityNode] represents an variable which is possibly
-  /// late, due to the late-inferring algorithm.
-  possiblyLate,
-
-  /// The associated [NullabilityNode] represents an variable which is possibly
-  /// late, due to being assigned in a function passed to a call to the test
-  /// package's `setUp` function.
-  possiblyLateDueToTestSetup,
-}
-
-/// Data structure to keep track of the relationship from one [NullabilityNode]
-/// object to another [NullabilityNode] that is "downstream" from it (meaning
-/// that if the former node is nullable, then the latter node will either have
-/// to be nullable, or null checks will have to be added).
-class NullabilityEdge implements EdgeInfo {
-  @override
-  final NullabilityNode destinationNode;
-
-  /// A set of upstream nodes.  By convention, the first node is the source node
-  /// and the other nodes are "guards".  The destination node will only need to
-  /// be made nullable if all the upstream nodes are nullable.
-  final List upstreamNodes;
-
-  final _NullabilityEdgeKind _kind;
-
-  /// The location in the source code that caused this edge to be built.
-  final CodeReference? codeReference;
-
-  final String description;
-
-  /// Whether this edge is the result of an uninitialized variable declaration.
-  final bool isUninit;
-
-  /// Whether this edge is the result of an assignment within the test package's
-  /// `setUp` function.
-  final bool isSetupAssignment;
-
-  NullabilityEdge._(
-      this.destinationNode, this.upstreamNodes, this._kind, this.description,
-      {this.codeReference,
-      this.isUninit = false,
-      this.isSetupAssignment = false});
-
-  @override
-  Iterable get guards => upstreamNodes.skip(1);
-
-  /// Indicates whether it's possible for migration to cope with this edge being
-  /// unsatisfied by inserting a null check.  Graph propagation favors
-  /// satisfying uncheckable edges over satisfying hard edges.
-  bool get isCheckable =>
-      _kind == _NullabilityEdgeKind.soft || _kind == _NullabilityEdgeKind.hard;
-
-  @override
-  bool get isHard =>
-      _kind == _NullabilityEdgeKind.hard ||
-      _kind == _NullabilityEdgeKind.union ||
-      _kind == _NullabilityEdgeKind.uncheckableHard;
-
-  @override
-  bool get isSatisfied {
-    if (!isTriggered) return true;
-    return destinationNode.isNullable;
-  }
-
-  @override
-  bool get isTriggered {
-    for (var upstreamNode in upstreamNodes) {
-      if (!upstreamNode!.isNullable) return false;
-    }
-    return true;
-  }
-
-  @override
-  bool get isUnion => _kind == _NullabilityEdgeKind.union;
-
-  @override
-  bool get isUpstreamTriggered {
-    if (!isHard) return false;
-    return destinationNode.nonNullIntent.isPresent;
-  }
-
-  @override
-  NullabilityNode? get sourceNode => upstreamNodes.first;
-
-  @override
-  String toString({NodeToIdMapper? idMapper}) {
-    var edgeDecorations = [];
-    switch (_kind) {
-      case _NullabilityEdgeKind.soft:
-        break;
-      case _NullabilityEdgeKind.uncheckable:
-        edgeDecorations.add('uncheckable');
-        break;
-      case _NullabilityEdgeKind.uncheckableHard:
-        edgeDecorations.add('uncheckableHard');
-        break;
-      case _NullabilityEdgeKind.hard:
-        edgeDecorations.add('hard');
-        break;
-      case _NullabilityEdgeKind.union:
-        edgeDecorations.add('union');
-        break;
-      case _NullabilityEdgeKind.dummy:
-        edgeDecorations.add('dummy');
-        break;
-    }
-    edgeDecorations.addAll(guards);
-    var edgeDecoration =
-        edgeDecorations.isEmpty ? '' : '-(${edgeDecorations.join(', ')})';
-    return '${sourceNode!.toString(idMapper: idMapper)} $edgeDecoration-> '
-        '${destinationNode.toString(idMapper: idMapper)}';
-  }
-}
-
-/// Data structure to keep track of the relationship between [NullabilityNode]
-/// objects.
-class NullabilityGraph {
-  /// Set this const to `true` to dump the nullability graph just before
-  /// propagation.
-  static const _debugBeforePropagation = false;
-
-  /// Set this const to `true` to dump the nullability graph just before
-  /// propagation.
-  static const _debugAfterPropagation = false;
-
-  final NullabilityMigrationInstrumentation? instrumentation;
-
-  /// Returns a [NullabilityNode] that is a priori nullable.
-  ///
-  /// Propagation of nullability always proceeds downstream starting at this
-  /// node.
-  final NullabilityNode always;
-
-  /// Returns a [NullabilityNode] that is a priori non-nullable.
-  ///
-  /// Propagation of nullability always proceeds upstream starting at this
-  /// node.
-  final NullabilityNode never;
-
-  /// Set containing all sources being migrated.
-  final _sourcesBeingMigrated = {};
-
-  /// Set containing paths to all sources being migrated.
-  final _pathsBeingMigrated = {};
-
-  /// A set containing all of the nodes in the graph.
-  final Set nodes = {};
-
-  NullabilityGraph({this.instrumentation})
-      : always = _NullabilityNodeImmutable('always', true),
-        never = _NullabilityNodeImmutable('never', false);
-
-  /// Records that [sourceNode] is immediately upstream from [destinationNode].
-  ///
-  /// Returns the edge created by the connection.
-  NullabilityEdge connect(NullabilityNode? sourceNode,
-      NullabilityNode destinationNode, EdgeOrigin origin,
-      {bool hard = false,
-      bool checkable = true,
-      List guards = const []}) {
-    var upstreamNodes = [sourceNode, ...guards];
-    var kind = hard
-        ? checkable
-            ? _NullabilityEdgeKind.hard
-            : _NullabilityEdgeKind.uncheckableHard
-        : checkable
-            ? _NullabilityEdgeKind.soft
-            : _NullabilityEdgeKind.uncheckable;
-    return _connect(upstreamNodes, destinationNode, kind, origin);
-  }
-
-  /// Records that [sourceNode] is immediately upstream from [always], via a
-  /// dummy edge.
-  NullabilityEdge connectDummy(
-          NullabilityNode? sourceNode, EdgeOrigin origin) =>
-      _connect([sourceNode], always, _NullabilityEdgeKind.dummy, origin);
-
-  /// Prints out a representation of the graph nodes.  Useful in debugging
-  /// broken tests.
-  void debugDump() {
-    Set visitedNodes = {};
-    Map shortNames = {};
-    int counter = 0;
-    String nameNode(NullabilityNode node) {
-      if (node.isImmutable) {
-        var name = 'n${counter++}';
-        print('  $name [label="$node" shape=none]');
-        return name;
-      }
-      var name = shortNames[node];
-      if (name == null) {
-        shortNames[node] = name = 'n${counter++}';
-        String styleSuffix = node.isNullable ? ' style=filled' : '';
-        String intentSuffix =
-            node.nonNullIntent.isPresent ? ', non-null intent' : '';
-        String label = '$node (${node._nullability}$intentSuffix)';
-        print('  $name [label="$label"$styleSuffix]');
-        if (node is NullabilityNodeCompound) {
-          for (var component in node._components) {
-            print('  ${nameNode(component!)} -> $name [style=dashed]');
-          }
-        }
-      }
-      return name;
-    }
-
-    void visitNode(NullabilityNode? node) {
-      if (!visitedNodes.add(node)) return;
-      for (var edge in node!._upstreamEdges) {
-        String suffix;
-        if (edge.isUnion) {
-          suffix = ' [label="union"]';
-        } else if (edge.isHard) {
-          suffix = ' [label="hard"]';
-        } else if (edge.isCheckable) {
-          suffix = '';
-        } else {
-          suffix = ' [label="uncheckable"]';
-        }
-        var upstreamNodes = edge.upstreamNodes;
-        if (upstreamNodes.length == 1) {
-          print(
-              '  ${nameNode(upstreamNodes.single!)} -> ${nameNode(node)}$suffix');
-        } else {
-          var tmpName = 'n${counter++}';
-          print('  $tmpName [label=""]');
-          print('  $tmpName -> ${nameNode(node)}$suffix}');
-          for (var upstreamNode in upstreamNodes) {
-            print('  ${nameNode(upstreamNode!)} -> $tmpName');
-          }
-        }
-      }
-    }
-
-    print('digraph G {');
-    print('  rankdir="LR"');
-    visitNode(always);
-    visitNode(never);
-    for (var node in nodes) {
-      visitNode(node);
-    }
-    print('}');
-  }
-
-  /// Determine if [source] is in the code being migrated.
-  bool isBeingMigrated(Source source) {
-    return _sourcesBeingMigrated.contains(source);
-  }
-
-  bool isPathBeingMigrated(String path) {
-    return _pathsBeingMigrated.contains(path);
-  }
-
-  /// Creates a graph edge that will try to force the given [node] to be
-  /// non-nullable.
-  NullabilityEdge makeNonNullable(NullabilityNode? node, EdgeOrigin origin,
-      {bool hard = true, List guards = const []}) {
-    return connect(node, never, origin, hard: hard, guards: guards);
-  }
-
-  /// Creates union edges that will guarantee that the given [node] is
-  /// non-nullable.
-  void makeNonNullableUnion(NullabilityNode node, EdgeOrigin origin) {
-    union(node, never, origin);
-  }
-
-  /// Creates a graph edge that will try to force the given [node] to be
-  /// nullable.
-  void makeNullable(NullabilityNode node, EdgeOrigin origin,
-      {List guards = const []}) {
-    connect(always, node, origin, guards: guards);
-  }
-
-  /// Creates a `union` graph edge that will try to force the given [node] to be
-  /// nullable.  This is a stronger signal than [makeNullable] (it overrides
-  /// [makeNonNullable]).
-  void makeNullableUnion(NullabilityNode node, EdgeOrigin origin) {
-    union(always, node, origin);
-  }
-
-  /// Record source as code that is being migrated.
-  void migrating(Source source) {
-    _sourcesBeingMigrated.add(source);
-    _pathsBeingMigrated.add(source.fullName);
-  }
-
-  /// Creates a graph edge that will try to prevent the given [node] from being
-  /// marked `late`.
-  void preventLate(NullabilityNode node, EdgeOrigin origin) {
-    connect(node, always, origin);
-  }
-
-  /// Determines the nullability of each node in the graph by propagating
-  /// nullability information from one node to another.
-  PropagationResult propagate() {
-    if (_debugBeforePropagation) debugDump();
-    var propagationState = _PropagationState(always, never).result;
-    if (_debugAfterPropagation) debugDump();
-    return propagationState;
-  }
-
-  /// Records that nodes [x] and [y] should have exactly the same nullability.
-  void union(NullabilityNode x, NullabilityNode y, EdgeOrigin origin) {
-    _connect([x], y, _NullabilityEdgeKind.union, origin);
-    _connect([y], x, _NullabilityEdgeKind.union, origin);
-  }
-
-  /// Update the graph after an edge has been added or removed.
-  void update() {
-    //
-    // Reset the state of the nodes.
-    //
-    // This is inefficient because we reset the state of some nodes more than
-    // once, but not all nodes are reachable from both `never` and `always`, so
-    // we need to traverse the graph from both directions.
-    //
-    for (var node in nodes) {
-      node!.resetState();
-    }
-    //
-    // Reset the state of the listener.
-    //
-    instrumentation!.prepareForUpdate();
-    //
-    // Re-run the propagation step.
-    //
-    propagate();
-  }
-
-  NullabilityEdge _connect(
-      List upstreamNodes,
-      NullabilityNode destinationNode,
-      _NullabilityEdgeKind kind,
-      EdgeOrigin origin) {
-    var isUninit = origin.kind == EdgeOriginKind.fieldNotInitialized ||
-        origin.kind == EdgeOriginKind.implicitNullInitializer ||
-        origin.kind == EdgeOriginKind.uninitializedRead;
-    var edge = NullabilityEdge._(
-        destinationNode, upstreamNodes, kind, origin.description,
-        codeReference: origin.codeReference,
-        isUninit: isUninit,
-        isSetupAssignment: origin.isSetupAssignment);
-    instrumentation?.graphEdge(edge, origin);
-    for (var upstreamNode in upstreamNodes) {
-      _connectDownstream(upstreamNode!, edge);
-    }
-    destinationNode._upstreamEdges.add(edge);
-    nodes.addAll(upstreamNodes);
-    nodes.add(destinationNode);
-    return edge;
-  }
-
-  void _connectDownstream(NullabilityNode upstreamNode, NullabilityEdge edge) {
-    upstreamNode._downstreamEdges.add(edge);
-    if (upstreamNode is NullabilityNodeCompound) {
-      for (var component in upstreamNode._components) {
-        _connectDownstream(component!, edge);
-      }
-    }
-  }
-}
-
-/// Same as [NullabilityGraph], but extended with extra methods for easier
-/// testing.
-@visibleForTesting
-class NullabilityGraphForTesting extends NullabilityGraph {
-  final List _allEdges = [];
-
-  final Map _edgeOrigins = {};
-
-  /// Iterates through all edges in the graph.
-  @visibleForTesting
-  Iterable getAllEdges() {
-    return _allEdges;
-  }
-
-  /// Retrieves the [EdgeOrigin] object that was used to create [edge].
-  @visibleForTesting
-  EdgeOrigin? getEdgeOrigin(NullabilityEdge edge) => _edgeOrigins[edge];
-
-  @override
-  NullabilityEdge _connect(
-      List upstreamNodes,
-      NullabilityNode destinationNode,
-      _NullabilityEdgeKind kind,
-      EdgeOrigin origin) {
-    var edge = super._connect(upstreamNodes, destinationNode, kind, origin);
-    _allEdges.add(edge);
-    _edgeOrigins[edge] = origin;
-    return edge;
-  }
-}
-
-/// Representation of a single node in the nullability inference graph.
-///
-/// Initially, this is just a wrapper over constraint variables, and the
-/// nullability inference graph is encoded into the wrapped constraint
-/// variables.  Over time this will be replaced by a first class representation
-/// of the nullability inference graph.
-abstract class NullabilityNode implements NullabilityNodeInfo {
-  LateCondition _lateCondition = LateCondition.notLate;
-
-  @override
-  final hintActions = >>{};
-
-  bool _isPossiblyOptional = false;
-
-  /// List of [NullabilityEdge] objects describing this node's relationship to
-  /// other nodes that are "downstream" from it (meaning that if a key node is
-  /// nullable, then all the nodes in the corresponding value will either have
-  /// to be nullable, or null checks will have to be added).
-  final _downstreamEdges = [];
-
-  /// List of edges that have this node as their destination.
-  final _upstreamEdges = [];
-
-  /// List of compound nodes wrapping this node.
-  final List outerCompoundNodes =
-      [];
-
-  /// Creates a [NullabilityNode] representing the nullability of a variable
-  /// whose type comes from an already-migrated library.
-  factory NullabilityNode.forAlreadyMigrated(NullabilityNodeTarget target) =>
-      _NullabilityNodeSimple(target);
-
-  /// Creates a [NullabilityNode] representing the nullability of an expression
-  /// which is nullable iff two other nullability nodes are both nullable.
-  ///
-  /// The caller is required to create the appropriate graph edges to ensure
-  /// that the appropriate relationship between the nodes' nullabilities holds.
-  factory NullabilityNode.forGLB() => _NullabilityNodeSimple(
-      NullabilityNodeTarget.text('(greatest lower bound)'));
-
-  /// Creates a [NullabilityNode] representing the nullability of a variable
-  /// whose type is determined by the `??` operator.
-  factory NullabilityNode.forIfNotNull(AstNode node) => _NullabilityNodeSimple(
-      NullabilityNodeTarget.text('?? operator').withCodeRef(node));
-
-  /// Creates a [NullabilityNode] representing the nullability of a variable
-  /// whose type is determined by type inference.
-  factory NullabilityNode.forInferredType(NullabilityNodeTarget target) =>
-      _NullabilityNodeSimple(target);
-
-  /// Creates a [NullabilityNode] representing the nullability of an
-  /// expression which is nullable iff either [a] or [b] is nullable.
-  factory NullabilityNode.forLUB(
-      NullabilityNode? left, NullabilityNode? right) = NullabilityNodeForLUB._;
-
-  /// Creates a [NullabilityNode] representing the nullability of a type
-  /// substitution where [outerNode] is the nullability node for the type
-  /// variable being eliminated by the substitution, and [innerNode] is the
-  /// nullability node for the type being substituted in its place.
-  ///
-  /// If either [innerNode] or [outerNode] is `null`, then the other node is
-  /// returned.
-  factory NullabilityNode.forSubstitution(
-      NullabilityNode? innerNode, NullabilityNode? outerNode) {
-    if (innerNode == null) return outerNode!;
-    if (outerNode == null) return innerNode;
-    return NullabilityNodeForSubstitution._(innerNode, outerNode);
-  }
-
-  /// Creates a [NullabilityNode] representing the nullability of a type
-  /// annotation appearing explicitly in the user's program.
-  factory NullabilityNode.forTypeAnnotation(NullabilityNodeTarget target) =>
-      _NullabilityNodeSimple(target);
-
-  NullabilityNode._();
-
-  @override
-  CodeReference? get codeReference => null;
-
-  /// Gets a string that can be appended to a type name during debugging to help
-  /// annotate the nullability of that type.
-  String get debugSuffix => '?($this)';
-
-  /// Gets a name for the nullability node that is suitable for display to the
-  /// user.
-  String get displayName;
-
-  Iterable get downstreamEdges => _downstreamEdges;
-
-  /// After nullability propagation, this getter can be used to query whether
-  /// the type associated with this node should be considered "exact nullable".
-  @visibleForTesting
-  bool get isExactNullable;
-
-  /// After nullability propagation, this getter can be used to query whether
-  /// the type associated with this node should be considered nullable.
-  @override
-  bool get isNullable;
-
-  /// Indicates whether this node is associated with a named parameter for which
-  /// nullability migration needs to decide whether it is optional or required.
-  bool get isPossiblyOptional => _isPossiblyOptional;
-
-  /// Indicates whether this node is associated with a variable declaration
-  /// which should be annotated with "late".
-  LateCondition get lateCondition => _lateCondition;
-
-  /// After nullability propagation, this getter can be used to query the node's
-  /// non-null intent state.
-  NonNullIntent get nonNullIntent;
-
-  @override
-  Iterable get upstreamEdges => _upstreamEdges;
-
-  @override
-  UpstreamPropagationStep? get whyNotNullable;
-
-  Nullability? get _nullability;
-
-  /// Records the fact that an invocation was made to a function with named
-  /// parameters, and the named parameter associated with this node was not
-  /// supplied.
-  void recordNamedParameterNotSupplied(List guards,
-      NullabilityGraph graph, NamedParameterNotSuppliedOrigin origin) {
-    if (isPossiblyOptional) {
-      graph.connect(graph.always, this, origin, guards: guards);
-    }
-  }
-
-  /// Reset the state of this node to what it was before the graph was solved.
-  void resetState();
-
-  String toString({NodeToIdMapper? idMapper}) {
-    var name = displayName;
-    if (idMapper == null) {
-      return name;
-    } else {
-      return '${idMapper.idForNode(this)}: $name';
-    }
-  }
-
-  /// Tracks the possibility that this node is associated with a named parameter
-  /// for which nullability migration needs to decide whether it is optional or
-  /// required.
-  void trackPossiblyOptional() {
-    _isPossiblyOptional = true;
-  }
-}
-
-/// Base class for nullability nodes that are nullable if at least one of a set
-/// of other nodes is nullable, and non-nullable otherwise; the set of other
-/// nodes are called "components".
-abstract class NullabilityNodeCompound extends NullabilityNodeMutable {
-  NullabilityNodeCompound() : super._();
-
-  /// A map describing each of the node's components by name.
-  Map get componentsByName;
-
-  @override
-  bool get isExactNullable => _components.any((c) => c!.isExactNullable);
-
-  @override
-  bool get isNullable => _components.any((c) => c!.isNullable);
-
-  Iterable get _components;
-}
-
-/// Derived class for nullability nodes that arise from the least-upper-bound
-/// implied by a conditional expression.
-class NullabilityNodeForLUB extends NullabilityNodeCompound {
-  final NullabilityNode? left;
-
-  final NullabilityNode? right;
-
-  NullabilityNodeForLUB._(this.left, this.right) {
-    left!.outerCompoundNodes.add(this);
-    right!.outerCompoundNodes.add(this);
-  }
-
-  @override
-  Map get componentsByName =>
-      {'left': left, 'right': right};
-
-  @override
-  String get displayName => '${left!.displayName} or ${right!.displayName}';
-
-  @override
-  Iterable get _components => [left, right];
-
-  @override
-  void resetState() {
-    left!.resetState();
-    right!.resetState();
-  }
-}
-
-/// Derived class for nullability nodes that arise from type variable
-/// substitution.
-class NullabilityNodeForSubstitution extends NullabilityNodeCompound
-    implements SubstitutionNodeInfo {
-  @override
-  final NullabilityNode innerNode;
-
-  @override
-  final NullabilityNode outerNode;
-
-  NullabilityNodeForSubstitution._(this.innerNode, this.outerNode) {
-    innerNode.outerCompoundNodes.add(this);
-    outerNode.outerCompoundNodes.add(this);
-  }
-
-  @override
-  Map get componentsByName =>
-      {'inner': innerNode, 'outer': outerNode};
-
-  @override
-  String get displayName =>
-      '${innerNode.displayName} or ${outerNode.displayName}';
-
-  @override
-  Iterable get _components => [innerNode, outerNode];
-
-  @override
-  void resetState() {
-    innerNode.resetState();
-    outerNode.resetState();
-  }
-}
-
-/// Base class for nullability nodes whose state can be mutated safely.
-///
-/// Nearly all nullability nodes derive from this class; the only exceptions are
-/// the fixed nodes "always "never".
-abstract class NullabilityNodeMutable extends NullabilityNode {
-  Nullability? _nullability;
-
-  NonNullIntent _nonNullIntent;
-
-  DownstreamPropagationStep? _whyNullable;
-
-  UpstreamPropagationStep? _whyNotNullable;
-
-  NullabilityNodeMutable._(
-      {Nullability initialNullability = Nullability.nonNullable})
-      : _nullability = initialNullability,
-        _nonNullIntent = NonNullIntent.none,
-        super._();
-
-  @override
-  bool get isExactNullable => _nullability!.isExactNullable;
-
-  @override
-  bool get isImmutable => false;
-
-  @override
-  bool get isNullable => _nullability!.isNullable;
-
-  @override
-  NonNullIntent get nonNullIntent => _nonNullIntent;
-
-  @override
-  UpstreamPropagationStep? get whyNotNullable => _whyNotNullable;
-
-  @override
-  DownstreamPropagationStepInfo? get whyNullable => _whyNullable;
-
-  @override
-  void resetState() {
-    _nullability = Nullability.nonNullable;
-    _nonNullIntent = NonNullIntent.none;
-    _whyNullable = null;
-  }
-}
-
-/// Information produced by [NullabilityGraph.propagate] about the results of
-/// graph propagation.
-class PropagationResult {
-  /// A list of all edges that couldn't be satisfied.  May contain duplicates.
-  final List unsatisfiedEdges = [];
-
-  /// A list of all substitution nodes that couldn't be satisfied.
-  final List unsatisfiedSubstitutions = [];
-
-  PropagationResult._();
-}
-
-/// Class representing a step taken by the nullability propagation algorithm.
-abstract class PropagationStep implements PropagationStepInfo {
-  PropagationStep();
-
-  /// The location in the source code that caused this step to be necessary,
-  /// or `null` if not known.
-  CodeReference? get codeReference => null;
-
-  /// The previous propagation step that led to this one, or `null` if there was
-  /// no previous step.
-  PropagationStep? get principalCause;
-
-  @override
-  String toString({NodeToIdMapper? idMapper});
-}
-
-/// Propagation step where we consider mark one of the components of a
-/// substitution node as nullable because the substitution node itself is
-/// nullable.
-class ResolveSubstitutionPropagationStep extends ExactNullablePropagationStep {
-  @override
-  final DownstreamPropagationStep principalCause;
-
-  /// The substitution node that needed resolution.
-  final NullabilityNodeForSubstitution node;
-
-  ResolveSubstitutionPropagationStep(this.principalCause, this.node);
-
-  @override
-  EdgeInfo? get edge => null;
-
-  @override
-  String toString({NodeToIdMapper? idMapper}) =>
-      '${targetNode!.toString(idMapper: idMapper)} becomes $newState due to '
-      '${node.toString(idMapper: idMapper)}';
-}
-
-/// Propagation step where we mark the destination of an edge as nullable, due
-/// to its sources becoming nullable.
-class SimpleDownstreamPropagationStep extends DownstreamPropagationStep {
-  @override
-  final DownstreamPropagationStep? principalCause;
-
-  @override
-  final NullabilityEdge edge;
-
-  SimpleDownstreamPropagationStep(this.principalCause, this.edge);
-
-  @override
-  CodeReference? get codeReference => edge.codeReference;
-
-  @override
-  String toString({NodeToIdMapper? idMapper}) =>
-      '${targetNode!.toString(idMapper: idMapper)} becomes $newState due to '
-      '${edge.toString(idMapper: idMapper)}';
-}
-
-/// Propagation step where we mark the source of an edge as exact nullable, due
-/// to its destination becoming exact nullable.
-class SimpleExactNullablePropagationStep extends ExactNullablePropagationStep {
-  @override
-  final ExactNullablePropagationStep principalCause;
-
-  @override
-  final NullabilityEdge edge;
-
-  SimpleExactNullablePropagationStep(this.principalCause, this.edge);
-
-  @override
-  String toString({NodeToIdMapper? idMapper}) =>
-      '${targetNode!.toString(idMapper: idMapper)} becomes $newState due to '
-      '${edge.toString(idMapper: idMapper)}';
-}
-
-/// Propagation step where we mark a node as having non-null intent due to it
-/// being upstream from another node with non-null intent.
-class UpstreamPropagationStep extends PropagationStep
-    implements UpstreamPropagationStepInfo {
-  @override
-  final UpstreamPropagationStep? principalCause;
-
-  /// The node being marked as having non-null intent.
-  final NullabilityNode node;
-
-  /// The new state of the node's non-null intent.
-  final NonNullIntent newNonNullIntent;
-
-  /// The nullability edge connecting [node] to the node it is upstream from, if
-  /// any.
-  final NullabilityEdge? edge;
-
-  @override
-  final bool isStartingPoint;
-
-  UpstreamPropagationStep(
-      this.principalCause, this.node, this.newNonNullIntent, this.edge,
-      {this.isStartingPoint = false});
-
-  @override
-  CodeReference? get codeReference => edge?.codeReference;
-
-  @override
-  String toString({NodeToIdMapper? idMapper}) =>
-      '${node.toString(idMapper: idMapper)} becomes $newNonNullIntent';
-}
-
-/// Kinds of nullability edges
-enum _NullabilityEdgeKind {
-  /// Soft edge.  Propagates nullability downstream only.  May be overridden by
-  /// suggestions that the user intends non-nullability.
-  soft,
-
-  /// Uncheckable edge.  Propagates nullability downstream only.  May not be
-  /// overridden by suggestions that the user intends non-nullability.
-  uncheckable,
-
-  /// Hard edge.  Propagates nullability downstream and non-nullability
-  /// upstream.
-  hard,
-
-  /// Union edge.  Indicates that two nodes should have exactly the same
-  /// nullability.
-  union,
-
-  /// Uncheckable hard edge.  Propagates nullability downstream and
-  /// non-nullability upstream.  May not be overridden by suggestions that the
-  /// user intends non-nullability.
-  uncheckableHard,
-
-  /// Dummy edge.  Indicates that two edges are connected in a way that should
-  /// not propagate (non-)nullability in either direction.
-  dummy,
-}
-
-class _NullabilityNodeImmutable extends NullabilityNode {
-  @override
-  final String displayName;
-
-  @override
-  final bool isNullable;
-
-  _NullabilityNodeImmutable(this.displayName, this.isNullable) : super._();
-
-  @override
-  String get debugSuffix => isNullable ? '?' : '';
-
-  @override
-  Map>> get hintActions => const {};
-
-  @override
-  // Note: the node "always" is not exact nullable, because exact nullability is
-  // a concept for contravariant generics which propagates upstream instead of
-  // downstream. "always" is not a contravariant generic, and does not have any
-  // upstream nodes, so it should not be considered *exact* nullable.
-  bool get isExactNullable => false;
-
-  @override
-  bool get isImmutable => true;
-
-  @override
-  NonNullIntent get nonNullIntent =>
-      isNullable ? NonNullIntent.none : NonNullIntent.direct;
-
-  @override
-  UpstreamPropagationStep? get whyNotNullable => null;
-
-  @override
-  DownstreamPropagationStepInfo? get whyNullable => null;
-
-  @override
-  Nullability get _nullability =>
-      isNullable ? Nullability.ordinaryNullable : Nullability.nonNullable;
-
-  @override
-  void resetState() {
-    // There is no state to reset.
-  }
-}
-
-class _NullabilityNodeSimple extends NullabilityNodeMutable {
-  final NullabilityNodeTarget target;
-
-  _NullabilityNodeSimple(this.target) : super._();
-
-  @override
-  CodeReference? get codeReference => target.codeReference;
-
-  @override
-  String get displayName => target.displayName;
-}
-
-/// Workspace for performing graph propagation.
-///
-/// Graph propagation is performed immediately upon construction, so as soon as
-/// the caller has constructed this object, the graph has been propagated and
-/// the results of propagation can be retrieved from [result].
-class _PropagationState {
-  /// The result of propagation, for sharing with the client.
-  final PropagationResult result = PropagationResult._();
-
-  /// The graph's one and only "always" node.
-  final NullabilityNode _always;
-
-  /// The graph's one and only "never" node.
-  final NullabilityNode _never;
-
-  /// During any given stage of nullability propagation, a queue of all the
-  /// edges that need to be examined before the stage is complete.
-  final Queue _pendingDownstreamSteps =
-      Queue();
-
-  /// During execution of [_propagateDownstream], a list of all the substitution
-  /// nodes that have not yet been resolved.
-  List _pendingSubstitutions = [];
-
-  _PropagationState(this._always, this._never) {
-    _propagateUpstream();
-    _propagateDownstream();
-  }
-
-  /// Propagates nullability downstream.
-  void _propagateDownstream() {
-    assert(_pendingDownstreamSteps.isEmpty);
-    for (var edge in _always._downstreamEdges) {
-      _pendingDownstreamSteps.add(SimpleDownstreamPropagationStep(null, edge));
-    }
-    while (true) {
-      while (_pendingDownstreamSteps.isNotEmpty) {
-        var step = _pendingDownstreamSteps.removeFirst();
-        var edge = step.edge;
-        if (!edge.isTriggered) continue;
-        var node = edge.destinationNode;
-        if (edge.isUninit && !node.isNullable) {
-          // [edge] is an edge from always to an uninitialized variable
-          // declaration.
-          var isSetupAssigned = node.upstreamEdges
-              .any((e) => e is NullabilityEdge && e.isSetupAssignment);
-
-          // Whether all downstream edges go to nodes with non-null intent.
-          var allDownstreamHaveNonNullIntent = false;
-          if (node.downstreamEdges.isNotEmpty) {
-            allDownstreamHaveNonNullIntent = node.downstreamEdges.every((e) {
-              var destination = e.destinationNode;
-              return destination is NullabilityNode &&
-                  destination.nonNullIntent.isPresent;
-            });
-          }
-          if (allDownstreamHaveNonNullIntent) {
-            node._lateCondition = LateCondition.possiblyLate;
-            continue;
-          } else if (isSetupAssigned) {
-            node._lateCondition = LateCondition.possiblyLateDueToTestSetup;
-            continue;
-          }
-        }
-        var nonNullIntent = node.nonNullIntent;
-        if (nonNullIntent.isPresent) {
-          if (edge.isCheckable) {
-            // The node has already been marked as having non-null intent, and
-            // the edge can be addressed by adding a null check, so we prefer to
-            // leave the edge unsatisfied and let the null check happen.
-            result.unsatisfiedEdges.add(edge);
-            continue;
-          }
-          if (nonNullIntent.isDirect) {
-            // The node has direct non-null intent so we aren't in a position to
-            // mark it as nullable.
-            result.unsatisfiedEdges.add(edge);
-            continue;
-          }
-        }
-        if (node is NullabilityNodeMutable && !node.isNullable) {
-          assert(step.targetNode == null);
-          step.targetNode = node;
-          step.newState = Nullability.ordinaryNullable;
-          _setNullable(step);
-          node._lateCondition = LateCondition.notLate;
-        }
-      }
-      if (_pendingSubstitutions.isEmpty) break;
-      var oldPendingSubstitutions = _pendingSubstitutions;
-      _pendingSubstitutions = [];
-      for (var step in oldPendingSubstitutions) {
-        _resolvePendingSubstitution(step);
-      }
-    }
-  }
-
-  /// Propagates non-null intent upstream along unconditional control flow
-  /// lines.
-  void _propagateUpstream() {
-    Queue pendingSteps = Queue();
-    pendingSteps.add(UpstreamPropagationStep(
-        null, _never, NonNullIntent.direct, null,
-        isStartingPoint: true));
-    while (pendingSteps.isNotEmpty) {
-      var cause = pendingSteps.removeFirst();
-      var pendingNode = cause.node;
-      for (var edge in pendingNode._upstreamEdges) {
-        // We only propagate for nodes that are "upstream triggered".  At this
-        // point of propagation, a node is upstream triggered if it is hard.
-        assert(edge.isUpstreamTriggered == edge.isHard);
-        if (!edge.isHard) continue;
-        var node = edge.sourceNode;
-        if (node is NullabilityNodeMutable) {
-          var oldNonNullIntent = node._nonNullIntent;
-          NonNullIntent newNonNullIntent;
-          if (edge.isUnion && edge.destinationNode == _never) {
-            // If a node is unioned with "never" then it's considered to have
-            // direct non-null intent.
-            newNonNullIntent = NonNullIntent.direct;
-          } else {
-            newNonNullIntent = oldNonNullIntent.addIndirect();
-          }
-          var step =
-              UpstreamPropagationStep(cause, node, newNonNullIntent, edge);
-          _setNonNullIntent(step);
-          if (!oldNonNullIntent.isPresent) {
-            // We did not previously have non-null intent, so we need to
-            // propagate.
-            pendingSteps.add(step);
-          }
-        }
-      }
-      // If any compound node is forced to be non-nullable by this change,
-      // propagate to it.
-      for (var node in pendingNode.outerCompoundNodes) {
-        if (node._components
-            .any((component) => !component!.nonNullIntent.isPresent)) {
-          continue;
-        }
-        var oldNonNullIntent = node._nonNullIntent;
-        var newNonNullIntent = oldNonNullIntent.addIndirect();
-        var step = UpstreamPropagationStep(cause, node, newNonNullIntent, null);
-        _setNonNullIntent(step);
-        if (!oldNonNullIntent.isPresent) {
-          // We did not previously have non-null intent, so we need to
-          // propagate.
-          pendingSteps.add(step);
-        }
-      }
-    }
-  }
-
-  void _resolvePendingSubstitution(ResolveSubstitutionPropagationStep step) {
-    NullabilityNodeForSubstitution substitutionNode = step.node;
-    assert(substitutionNode._nullability!.isNullable);
-    // If both nodes pointed to by the substitution node have non-null intent,
-    // then no resolution is needed; the substitution node can’t be satisfied.
-    if (substitutionNode.innerNode.nonNullIntent.isPresent &&
-        substitutionNode.outerNode.nonNullIntent.isPresent) {
-      result.unsatisfiedSubstitutions.add(substitutionNode);
-      return;
-    }
-
-    // Otherwise, if the outer node is in a nullable state, then no resolution
-    // is needed because the substitution node is already satisfied.
-    if (substitutionNode.outerNode.isNullable) {
-      return;
-    }
-
-    // Otherwise, if the inner node has non-null intent, then we set the outer
-    // node to the ordinary nullable state.
-    if (substitutionNode.innerNode.nonNullIntent.isPresent) {
-      assert(step.targetNode == null);
-      step.targetNode = substitutionNode.outerNode as NullabilityNodeMutable;
-      step.newState = Nullability.ordinaryNullable;
-      _setNullable(step);
-      return;
-    }
-
-    // Otherwise, we set the inner node to the exact nullable state, and we
-    // propagate this state upstream as far as possible using the following
-    // rule: if there is an edge A → B, where A is in the undetermined or
-    // ordinary nullable state, and B is in the exact nullable state, then A’s
-    // state is changed to exact nullable.
-    var pendingExactNullableSteps = [];
-    var node = substitutionNode.innerNode;
-    if (node is NullabilityNodeMutable) {
-      assert(step.targetNode == null);
-      step.targetNode = node;
-      step.newState = Nullability.exactNullable;
-      var oldNullability = _setNullable(step);
-      if (!oldNullability.isExactNullable) {
-        // Was not previously in the "exact nullable" state.  Need to
-        // propagate.
-        for (var edge in node._upstreamEdges) {
-          pendingExactNullableSteps
-              .add(SimpleExactNullablePropagationStep(step, edge));
-        }
-
-        // TODO(mfairhurst): should this propagate back up outerContainerNodes?
-      }
-    }
-
-    while (pendingExactNullableSteps.isNotEmpty) {
-      var step = pendingExactNullableSteps.removeLast();
-      var edge = step.edge;
-      var node = edge.sourceNode;
-      if (node is NullabilityNodeMutable &&
-          !edge.isCheckable &&
-          !node.nonNullIntent.isPresent) {
-        assert(step.targetNode == null);
-        step.targetNode = node;
-        step.newState = Nullability.exactNullable;
-        var oldNullability = _setNullable(step);
-        if (!oldNullability.isExactNullable) {
-          // Was not previously in the "exact nullable" state.  Need to
-          // propagate.
-          for (var edge in node._upstreamEdges) {
-            pendingExactNullableSteps
-                .add(SimpleExactNullablePropagationStep(step, edge));
-          }
-        }
-      }
-    }
-  }
-
-  void _setNonNullIntent(UpstreamPropagationStep step) {
-    var node = step.node as NullabilityNodeMutable;
-    var newNonNullIntent = step.newNonNullIntent;
-    var oldNonNullIntent = node.nonNullIntent;
-    node._nonNullIntent = newNonNullIntent;
-    if (!oldNonNullIntent.isPresent) {
-      node._whyNotNullable = step;
-    }
-  }
-
-  Nullability _setNullable(DownstreamPropagationStep step) {
-    var node = step.targetNode!;
-    var newState = step.newState;
-    var oldState = node._nullability!;
-    node._nullability = newState;
-    if (!oldState.isNullable) {
-      node._whyNullable = step;
-      // Was not previously nullable, so we need to propagate.
-      for (var edge in node._downstreamEdges) {
-        _pendingDownstreamSteps
-            .add(SimpleDownstreamPropagationStep(step, edge));
-      }
-      if (node is NullabilityNodeForSubstitution) {
-        _pendingSubstitutions
-            .add(ResolveSubstitutionPropagationStep(step, node));
-      }
-    }
-    return oldState;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/nullability_node_target.dart b/pkg/nnbd_migration/lib/src/nullability_node_target.dart
deleted file mode 100644
index 83199366ef3e..000000000000
--- a/pkg/nnbd_migration/lib/src/nullability_node_target.dart
+++ /dev/null
@@ -1,215 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-
-String _computeElementName(Element? element) {
-  List parts = [];
-  while (element != null && element is! CompilationUnitElement) {
-    var name = element.name;
-    if (name == null || name.isEmpty) {
-      parts.add('');
-    } else {
-      parts.add(name);
-    }
-    element = element.enclosingElement;
-  }
-  if (parts.isEmpty) {
-    assert(false, 'Could not compute a name for $element');
-    return '';
-  }
-  return parts.reversed.join('.');
-}
-
-/// Data structure tracking information about which type in the user's source
-/// code is referenced by a given nullability node.
-abstract class NullabilityNodeTarget {
-  /// Creates a [NullabilityNodeTarget] referring to a particular element.
-  factory NullabilityNodeTarget.element(Element element) =
-      _NullabilityNodeTarget_Element;
-
-  /// Creates a [NullabilityNodeTarget] with a simple text description.
-  factory NullabilityNodeTarget.text(String name) = _NullabilityNodeTarget_Text;
-
-  /// Creates a new [NullabilityNodeTarget] representing the bound of a type
-  /// parameter.
-  factory NullabilityNodeTarget.typeParameterBound(
-      TypeParameterElement element) = _NullabilityNodeTarget_TypeParameterBound;
-
-  NullabilityNodeTarget._();
-
-  /// The source code location associated with this target, if known.  Otherwise
-  /// `null`.
-  CodeReference? get codeReference => null;
-
-  /// Gets a short description of this nullability node target suitable for
-  /// displaying to the user, not including a code reference.
-  String get description;
-
-  /// Same as [description], but if there is a [codeReference], it is included
-  /// after the description in parentheses.
-  String get displayName {
-    if (codeReference == null) return description;
-    return '$description (${codeReference!.shortName})';
-  }
-
-  NullabilityNodeTarget get supertype => _NullabilityNodeTarget_Supertype(this);
-
-  /// Creates a new [NullabilityNodeTarget] representing a named function
-  /// parameter of this target.
-  NullabilityNodeTarget namedParameter(String name) =>
-      _NullabilityNodeTarget_NamedParameter(this, name);
-
-  /// Creates a new [NullabilityNodeTarget] representing a positional function
-  /// parameter of this target.
-  NullabilityNodeTarget positionalParameter(int index) =>
-      _NullabilityNodeTarget_PositionalParameter(this, index);
-
-  /// Creates a new [NullabilityNodeTarget] representing a function return type
-  /// of this target.
-  NullabilityNodeTarget returnType() => _NullabilityNodeTarget_ReturnType(this);
-
-  /// Creates a new [NullabilityNodeTarget] representing a type argument of this
-  /// target.
-  NullabilityNodeTarget typeArgument(int index) =>
-      _NullabilityNodeTarget_TypeArgument(this, index);
-
-  /// Creates a new [NullabilityNodeTarget] representing the bound of a formal
-  /// function type parameter of this target.
-  NullabilityNodeTarget typeFormalBound(String typeFormalName) =>
-      _NullabilityNodeTarget_TypeFormalBound(this, typeFormalName);
-
-  /// Creates a [NullabilityNodeTarget] referring to a particular point in the
-  /// source code.
-  NullabilityNodeTarget withCodeRef(AstNode astNode) =>
-      _NullabilityNodeTarget_CodeRef(this, astNode);
-}
-
-/// Nullability node target representing a reference to a specific location in
-/// source code.
-class _NullabilityNodeTarget_CodeRef extends NullabilityNodeTarget {
-  final NullabilityNodeTarget inner;
-
-  final CodeReference codeReference;
-
-  _NullabilityNodeTarget_CodeRef(this.inner, AstNode astNode)
-      : codeReference = CodeReference.fromAstNode(astNode),
-        super._();
-
-  @override
-  String get description => inner.description;
-}
-
-/// Nullability node target representing the type of an element.
-class _NullabilityNodeTarget_Element extends NullabilityNodeTarget {
-  final String name;
-
-  final CodeReference codeReference;
-
-  _NullabilityNodeTarget_Element(Element element)
-      : name = _computeElementName(element),
-        codeReference = CodeReference.fromElement(element),
-        super._();
-
-  @override
-  String get description => name;
-}
-
-/// Nullability node target representing the type of a named function parameter.
-class _NullabilityNodeTarget_NamedParameter
-    extends _NullabilityNodeTarget_Part {
-  final String name;
-
-  _NullabilityNodeTarget_NamedParameter(super.inner, this.name);
-
-  @override
-  String get description => 'parameter $name of ${inner.description}';
-}
-
-/// Nullability node target representing a type that forms part of a larger type
-/// (e.g. the `int` part of `List`).
-abstract class _NullabilityNodeTarget_Part extends NullabilityNodeTarget {
-  final NullabilityNodeTarget inner;
-
-  _NullabilityNodeTarget_Part(this.inner) : super._();
-
-  @override
-  CodeReference? get codeReference => inner.codeReference;
-}
-
-/// Nullability node target representing the type of a positional function
-/// parameter.
-class _NullabilityNodeTarget_PositionalParameter
-    extends _NullabilityNodeTarget_Part {
-  final int index;
-
-  _NullabilityNodeTarget_PositionalParameter(super.inner, this.index);
-
-  @override
-  String get description => 'parameter $index of ${inner.description}';
-}
-
-/// Nullability node target representing a function's return type.
-class _NullabilityNodeTarget_ReturnType extends _NullabilityNodeTarget_Part {
-  _NullabilityNodeTarget_ReturnType(super.inner);
-
-  @override
-  String get description => 'return type of ${inner.description}';
-}
-
-/// Nullability node target representing one of a class's supertypes.
-class _NullabilityNodeTarget_Supertype extends _NullabilityNodeTarget_Part {
-  _NullabilityNodeTarget_Supertype(super.inner);
-
-  @override
-  String get description => 'supertype of ${inner.description}';
-}
-
-/// Nullability node target for which we only know a string description.
-class _NullabilityNodeTarget_Text extends NullabilityNodeTarget {
-  final String name;
-
-  _NullabilityNodeTarget_Text(this.name) : super._();
-
-  @override
-  String get description => name;
-}
-
-/// Nullability node target representing a type argument of an interface type or
-/// or typedef.
-class _NullabilityNodeTarget_TypeArgument extends _NullabilityNodeTarget_Part {
-  final int index;
-
-  _NullabilityNodeTarget_TypeArgument(super.inner, this.index);
-
-  @override
-  String get description => 'type argument $index of ${inner.description}';
-}
-
-/// Nullability node target representing a bound of a function type's formal
-/// type parameter.
-class _NullabilityNodeTarget_TypeFormalBound
-    extends _NullabilityNodeTarget_Part {
-  final String typeFormalName;
-
-  _NullabilityNodeTarget_TypeFormalBound(super.inner, this.typeFormalName);
-
-  @override
-  String get description =>
-      'bound of type formal $typeFormalName of ${inner.description}';
-}
-
-/// Nullability node target representing a type parameter bound.
-class _NullabilityNodeTarget_TypeParameterBound extends NullabilityNodeTarget {
-  final String name;
-
-  _NullabilityNodeTarget_TypeParameterBound(TypeParameterElement element)
-      : name = _computeElementName(element),
-        super._();
-
-  @override
-  String get description => 'bound of $name';
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/dart_file_page.dart b/pkg/nnbd_migration/lib/src/preview/dart_file_page.dart
deleted file mode 100644
index d1ff55a32f32..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/dart_file_page.dart
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert';
-
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/unit_renderer.dart';
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that is displayed when a preview of a valid Dart file is requested.
-class DartFilePage extends PreviewPage {
-  /// The information about the file being previewed.
-  final UnitInfo unitInfo;
-
-  /// Initialize a newly created Dart file page within the given [site]. The
-  /// [unitInfo] provides the information needed to render the page.
-  DartFilePage(PreviewSite site, this.unitInfo)
-      // TODO(brianwilkerson) The path needs to be converted to use '/' if that
-      //  isn't already done as part of building the unitInfo.
-      : super(site, unitInfo.path!.substring(1));
-
-  @override
-  bool get requiresAuth => true;
-
-  @override
-  void generateBody(Map params) {
-    throw UnsupportedError('generateBody');
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    var renderer = UnitRenderer(
-        unitInfo, site.migrationInfo, site.pathMapper, site.serviceAuthToken);
-    buf.write(jsonEncode(renderer.render().toJson()));
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/dart_logo_page.dart b/pkg/nnbd_migration/lib/src/preview/dart_logo_page.dart
deleted file mode 100644
index 009a6718d182..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/dart_logo_page.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/resources/resources.g.dart'
-    as resources;
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that contains the Dart logo.
-class DartLogoPage extends PreviewPage {
-  /// Initialize a newly created Dart logo page within the given [site].
-  DartLogoPage(PreviewSite site)
-      : super(site, PreviewSite.dartLogoPath.substring(1));
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    throw UnimplementedError();
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    buf.write(resources.dart_192_png);
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/exception_page.dart b/pkg/nnbd_migration/lib/src/preview/exception_page.dart
deleted file mode 100644
index 2d8abcc766f6..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/exception_page.dart
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert';
-
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that is displayed when an exception is encountered in the process
-/// of composing the content of a different page.
-class ExceptionPage extends PreviewPage {
-  /// The message from the exception that caused this page to be displayed.
-  final String message;
-
-  /// The stack trace of the exception that caused this page to be displayed.
-  final StackTrace stackTrace;
-
-  /// Initialize a newly created exception page within the given [site]. The
-  /// [message] and [stackTrace] are used to describe the exception to the user.
-  ExceptionPage(PreviewSite site, String path, this.message, this.stackTrace)
-      : super(site, path.substring(1));
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    buf.write('''
-
500 Exception in preview

-

-We're sorry, but you've encountered a bug in the preview tool. Please visit
-
-github.com/dart-lang/sdk/issues/new to report the issue and include the
-stack trace below.
-

-
$message

-

-${htmlEscape.convert(stackTrace.toString())}
-

-''');
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/highlight_css_page.dart b/pkg/nnbd_migration/lib/src/preview/highlight_css_page.dart
deleted file mode 100644
index 5b13262a3395..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/highlight_css_page.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/resources/resources.g.dart'
-    as resources;
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that contains the CSS used to style the semantic highlighting
-/// within a Dart file.
-class HighlightCssPage extends PreviewPage {
-  /// Initialize a newly created CSS page within the given [site].
-  HighlightCssPage(PreviewSite site)
-      : super(site, PreviewSite.highlightCssPath.substring(1));
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    throw UnimplementedError();
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    buf.write(resources.highlight_css);
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/highlight_js_page.dart b/pkg/nnbd_migration/lib/src/preview/highlight_js_page.dart
deleted file mode 100644
index 564c782fdae4..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/highlight_js_page.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/resources/resources.g.dart'
-    as resources;
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that contains the JavaScript used to apply semantic highlighting
-/// styles to a Dart file.
-class HighlightJSPage extends PreviewPage {
-  /// Initialize a newly created JS page within the given [site].
-  HighlightJSPage(PreviewSite site)
-      : super(site, PreviewSite.highlightJsPath.substring(1));
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    throw UnimplementedError();
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    buf.write(resources.highlight_pack_js);
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/http_preview_server.dart b/pkg/nnbd_migration/lib/src/preview/http_preview_server.dart
deleted file mode 100644
index d27ac3de94bb..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/http_preview_server.dart
+++ /dev/null
@@ -1,144 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:io';
-
-import 'package:cli_util/cli_logging.dart';
-import 'package:nnbd_migration/src/front_end/migration_state.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// Instances of the class [AbstractGetHandler] handle GET requests.
-abstract class AbstractGetHandler {
-  /// Handle a GET request received by the HTTP server.
-  Future handleGetRequest(HttpRequest request);
-}
-
-/// Instances of the class [AbstractPostHandler] handle POST requests.
-abstract class AbstractPostHandler {
-  /// Handle a POST request received by the HTTP server.
-  Future handlePostRequest(HttpRequest request);
-}
-
-/// Instances of the class [HttpPreviewServer] implement a simple HTTP server
-/// that serves up dartfix preview pages.
-class HttpPreviewServer {
-  /// The state of the migration being previewed.
-  final MigrationState migrationState;
-
-  /// The [PreviewSite] that can handle GET and POST requests.
-  PreviewSite? _previewSite;
-
-  /// Future that is completed with the HTTP server once it is running.
-  Future? _serverFuture;
-
-  // A function which allows the migration to be rerun, taking changed paths.
-  final Future Function() rerunFunction;
-
-  /// Callback function that should be invoked after successfully applying
-  /// migration.
-  final void Function() applyHook;
-
-  /// The internet address the server should bind to.  Should be suitable for
-  /// passing to HttpServer.bind, i.e. either a [String] or an
-  /// [InternetAddress].
-  final Object? bindAddress;
-
-  /// Integer for a port to run the preview server on.  If null or zero, allow
-  /// [HttpServer.bind] to pick one.
-  final int? preferredPort;
-
-  final Logger _logger;
-
-  /// Initialize a newly created HTTP server.
-  HttpPreviewServer(this.migrationState, this.rerunFunction, this.applyHook,
-      this.bindAddress, this.preferredPort, this._logger)
-      : assert(bindAddress is String || bindAddress is InternetAddress);
-
-  Future get authToken async {
-    await _serverFuture;
-    return previewSite.serviceAuthToken;
-  }
-
-  /// Return the port this server is bound to.
-  Future get boundHostname async {
-    return (await _serverFuture)?.address.host;
-  }
-
-  /// Return the port this server is bound to.
-  Future get boundPort async {
-    return (await _serverFuture)?.port;
-  }
-
-  PreviewSite get previewSite => _previewSite ??=
-      PreviewSite(migrationState, rerunFunction, applyHook, _logger);
-
-  void close() {
-    _serverFuture?.then((HttpServer server) {
-      server.close();
-    });
-  }
-
-  /// Begin serving HTTP requests over the given port.
-  Future serveHttp() async {
-    if (_serverFuture != null) {
-      return boundPort;
-    }
-
-    try {
-      _serverFuture = HttpServer.bind(bindAddress, preferredPort ?? 0);
-      var server = await _serverFuture!;
-      _handleServer(server);
-      return server.port;
-    } catch (ignore) {
-      // If we can't bind to the specified port, don't remember the broken
-      // server.
-      _serverFuture = null;
-      // TODO(jcollins-g): Display a better error message?
-      rethrow;
-    }
-  }
-
-  /// Handle a GET request received by the HTTP server.
-  Future _handleGetRequest(HttpRequest request) async {
-    await previewSite.handleGetRequest(request);
-  }
-
-  /// Handle a POST request received by the HTTP server.
-  Future _handlePostRequest(HttpRequest request) async {
-    await previewSite.handlePostRequest(request);
-  }
-
-  /// Attach a listener to a newly created HTTP server.
-  void _handleServer(HttpServer httpServer) {
-    httpServer.listen((HttpRequest request) async {
-      var updateValues = request.headers[HttpHeaders.upgradeHeader];
-      if (request.method == 'GET') {
-        await _handleGetRequest(request);
-      } else if (request.method == 'POST') {
-        await _handlePostRequest(request);
-      } else if (updateValues != null && updateValues.contains('websocket')) {
-        // We do not support serving analysis server communications over
-        // WebSocket connections.
-        var response = request.response;
-        response.statusCode = HttpStatus.notFound;
-        response.headers.contentType = ContentType.text;
-        response.write(
-            'WebSocket connections not supported (${request.uri.path}).');
-        response.close();
-      } else {
-        _returnUnknownRequest(request);
-      }
-    });
-  }
-
-  /// Return an error in response to an unrecognized request received by the HTTP
-  /// server.
-  void _returnUnknownRequest(HttpRequest request) {
-    var response = request.response;
-    response.statusCode = HttpStatus.notFound;
-    response.headers.contentType = ContentType.text;
-    response.write('Not found');
-    response.close();
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/index_file_page.dart b/pkg/nnbd_migration/lib/src/preview/index_file_page.dart
deleted file mode 100644
index 3e658e12973f..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/index_file_page.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/instrumentation_renderer.dart';
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that is displayed when the root of the included path is requested.
-class IndexFilePage extends PreviewPage {
-  /// Initialize a newly created index file page within the given [site].
-  IndexFilePage(PreviewSite site)
-      : super(site, site.migrationInfo!.includedRoot);
-
-  @override
-  bool get requiresAuth => true;
-
-  @override
-  void generateBody(Map params) {
-    throw UnsupportedError('generateBody');
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    var renderer = InstrumentationRenderer(site.migrationInfo, site.pathMapper,
-        site.migrationState!.hasBeenApplied, site.migrationState!.needsRerun);
-    buf.write(renderer.render());
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/material_icons_page.dart b/pkg/nnbd_migration/lib/src/preview/material_icons_page.dart
deleted file mode 100644
index df3dc90be015..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/material_icons_page.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/resources/resources.g.dart'
-    as resources;
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that contains the CSS used to style the semantic highlighting
-/// within a Dart file.
-class MaterialIconsPage extends PreviewPage {
-  /// Initialize a newly created CSS page within the given [site].
-  MaterialIconsPage(PreviewSite site)
-      : super(site, PreviewSite.materialIconsPath.substring(1));
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    throw UnimplementedError();
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    buf.write(resources.MaterialIconsRegular_ttf);
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/navigation_tree_page.dart b/pkg/nnbd_migration/lib/src/preview/navigation_tree_page.dart
deleted file mode 100644
index 2ae2183a3adc..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/navigation_tree_page.dart
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert';
-
-import 'package:nnbd_migration/src/front_end/navigation_tree_renderer.dart';
-import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart';
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The JSON that is displayed for the navigation tree.
-class NavigationTreePage extends PreviewPage {
-  /// Initialize a newly created navigation tree page within the given [site].
-  NavigationTreePage(PreviewSite site)
-      : super(site, site.migrationInfo!.includedRoot);
-
-  @override
-  bool get requiresAuth => true;
-
-  @override
-  // TODO(srawlins): Refactor JSON-returning pages like this to not inherit all
-  //  of the HTML logic from [PreviewPage].
-  void generateBody(Map params) {
-    throw UnsupportedError('generateBody');
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    var renderer = NavigationTreeRenderer(site.migrationInfo, site.pathMapper);
-    buf.write(jsonEncode(NavigationTreeNode.listToJson(renderer.render())));
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/not_found_page.dart b/pkg/nnbd_migration/lib/src/preview/not_found_page.dart
deleted file mode 100644
index efc86434c493..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/not_found_page.dart
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-
-/// The page that is displayed when an invalid URL is requested.
-class NotFoundPage extends PreviewPage {
-  /// Initialize a newly created file-not-found page within the given [site].
-  /// The [id] is the portion of the path to the page that follows the initial
-  /// slash ('/').
-  NotFoundPage(super.site, String super.id);
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    buf.write('''
-
404 Not found

-

-'$path' not found.
-

-''');
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/pages.dart b/pkg/nnbd_migration/lib/src/preview/pages.dart
deleted file mode 100644
index 6a7829799aef..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/pages.dart
+++ /dev/null
@@ -1,116 +0,0 @@
-// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert';
-import 'dart:io';
-
-/// An entity that knows how to serve itself over http.
-abstract class Page {
-  final StringBuffer buf = StringBuffer();
-
-  final String? id;
-
-  Page(this.id);
-
-  String get path => '/$id';
-
-  Future generate(Map params) async {
-    buf.clear();
-    // TODO(brianwilkerson) Determine if await is necessary, if so, change the
-    // return type of [generatePage] to `Future`.
-    await (generatePage(params) as dynamic);
-    return buf.toString();
-  }
-
-  Future generatePage(Map params);
-}
-
-/// Contains a collection of Pages.
-abstract class Site {
-  final String title;
-  final List pages = [];
-
-  Site(this.title);
-
-  Page createExceptionPage(String message, StackTrace trace);
-
-  Page createUnknownPage(String unknownPath);
-
-  Future handleGetRequest(HttpRequest request) async {
-    try {
-      var path = request.uri.path;
-
-      if (path == '/') {
-        respondRedirect(request, pages.first.path);
-        return;
-      }
-
-      for (var page in pages) {
-        if (page.path == path) {
-          var response = request.response;
-          response.headers.contentType = ContentType.html;
-          response.write(await page.generate(request.uri.queryParameters));
-          response.close();
-          return;
-        }
-      }
-
-      await respond(request, createUnknownPage(path), HttpStatus.notFound);
-    } catch (e, st) {
-      try {
-        await respond(request, createExceptionPage('$e', st),
-            HttpStatus.internalServerError);
-      } catch (e, st) {
-        var response = request.response;
-        response.statusCode = HttpStatus.internalServerError;
-        response.headers.contentType = ContentType.text;
-        response.write('$e\n\n$st');
-        response.close();
-      }
-    }
-  }
-
-  Future respond(
-    HttpRequest request,
-    Page page, [
-    int code = HttpStatus.ok,
-  ]) async {
-    var response = request.response;
-    response.statusCode = code;
-    response.headers.contentType = ContentType.html;
-    response.write(await page.generate(request.uri.queryParameters));
-    await response.close();
-  }
-
-  Future respondJson(
-    HttpRequest request,
-    Map json, [
-    int code = HttpStatus.ok,
-  ]) async {
-    var response = request.response;
-    response.statusCode = code;
-    response.headers.contentType = ContentType.json;
-    response.write(jsonEncode(json));
-    await response.close();
-  }
-
-  Future respondOk(
-    HttpRequest request, {
-    int code = HttpStatus.ok,
-  }) async {
-    if (request.headers.contentType!.subType == 'json') {
-      return respondJson(request, {'success': true}, code);
-    }
-
-    var response = request.response;
-    response.statusCode = code;
-    await response.close();
-  }
-
-  Future respondRedirect(HttpRequest request, String pathFragment) async {
-    var response = request.response;
-    response.statusCode = HttpStatus.movedTemporarily;
-    await response.redirect(request.uri.resolve(pathFragment));
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/preview_page.dart b/pkg/nnbd_migration/lib/src/preview/preview_page.dart
deleted file mode 100644
index e7b4479e738d..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/preview_page.dart
+++ /dev/null
@@ -1,42 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/preview/pages.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// A page displayed on the preview site.
-abstract class PreviewPage extends Page {
-  /// The site containing the page.
-  final PreviewSite site;
-
-  /// Initialize a newly created page within the given [site]. The [id] is the
-  /// portion of the path to the page that follows the initial slash ('/').
-  PreviewPage(this.site, String? id) : super(id);
-
-  /// Whether pages of this type require authorization.
-  bool get requiresAuth;
-
-  /// Generate the content of the body tag.
-  void generateBody(Map params);
-
-  /// Generate the content of the head tag.
-  void generateHead() {
-    buf.writeln('');
-    buf.writeln('');
-    buf.writeln('${site.title}');
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    buf.writeln('');
-    buf.writeln('');
-    buf.writeln('');
-    generateHead();
-    buf.writeln('');
-    generateBody(params);
-    buf.writeln('');
-    buf.writeln('');
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/preview_site.dart b/pkg/nnbd_migration/lib/src/preview/preview_site.dart
deleted file mode 100644
index 1ac4052e57b7..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/preview_site.dart
+++ /dev/null
@@ -1,704 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert';
-import 'dart:io';
-import 'dart:math';
-import 'dart:typed_data';
-
-import 'package:analyzer/src/manifest/charcodes.dart';
-import 'package:analyzer_plugin/protocol/protocol_common.dart';
-import 'package:cli_util/cli_logging.dart';
-import 'package:meta/meta.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/migration_state.dart';
-import 'package:nnbd_migration/src/front_end/path_mapper.dart';
-import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart';
-import 'package:nnbd_migration/src/hint_action.dart';
-import 'package:nnbd_migration/src/preview/dart_file_page.dart';
-import 'package:nnbd_migration/src/preview/dart_logo_page.dart';
-import 'package:nnbd_migration/src/preview/exception_page.dart';
-import 'package:nnbd_migration/src/preview/highlight_css_page.dart';
-import 'package:nnbd_migration/src/preview/highlight_js_page.dart';
-import 'package:nnbd_migration/src/preview/http_preview_server.dart';
-import 'package:nnbd_migration/src/preview/index_file_page.dart';
-import 'package:nnbd_migration/src/preview/material_icons_page.dart';
-import 'package:nnbd_migration/src/preview/navigation_tree_page.dart';
-import 'package:nnbd_migration/src/preview/not_found_page.dart';
-import 'package:nnbd_migration/src/preview/pages.dart';
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/region_page.dart';
-import 'package:nnbd_migration/src/preview/roboto_mono_page.dart';
-import 'package:nnbd_migration/src/preview/roboto_page.dart';
-import 'package:nnbd_migration/src/preview/unauthorized_page.dart';
-
-// The randomly generated auth token used to access the preview site.
-String _makeAuthToken() {
-  final kTokenByteSize = 8;
-  var bytes = Uint8List(kTokenByteSize);
-  var random = Random.secure();
-  for (var i = 0; i < kTokenByteSize; i++) {
-    bytes[i] = random.nextInt(256);
-  }
-  return base64Url.encode(bytes);
-}
-
-/// A plan for an incremental migration.
-///
-/// This plan uses [UnitMigrationStatus]es from [NavigationTreeNode]s to apply
-/// different edits to different files:
-///
-/// * migrating files will be edited according to a [SourceFileEdit],
-/// * newly opted out files will be prepended with a Dart Language Version
-///   comment specifying "2.9",
-/// * already opted out files will remain unchanged.
-class IncrementalPlan {
-  static final _nonWhitespaceChar = RegExp(r'\S');
-  final MigrationInfo? migrationInfo;
-  final Map unitInfoMap;
-  final PathMapper? pathMapper;
-  final List edits;
-  final Logger? logger;
-
-  /// The set of units which are to be opted out in this migration.
-  final Set optOutUnitPaths;
-
-  /// Creates a new [IncrementalPlan], extracting all of the paths which are
-  /// "opting out" from [navigationTree].
-  factory IncrementalPlan(
-      MigrationInfo? migrationInfo,
-      Map unitInfoMap,
-      PathMapper? pathMapper,
-      List edits,
-      Iterable navigationTree,
-      Logger? logger) {
-    var optOutUnitPaths = {};
-    void addUnitsToOptOut(NavigationTreeNode entity) {
-      if (entity is NavigationTreeDirectoryNode) {
-        for (var child in entity.subtree!) {
-          addUnitsToOptOut(child);
-        }
-      } else {
-        if (entity.migrationStatus == UnitMigrationStatus.optingOut) {
-          optOutUnitPaths.add(entity.path);
-        }
-      }
-    }
-
-    for (var entity in navigationTree) {
-      addUnitsToOptOut(entity);
-    }
-
-    return IncrementalPlan._(
-        migrationInfo, unitInfoMap, pathMapper, edits, optOutUnitPaths, logger);
-  }
-
-  IncrementalPlan._(this.migrationInfo, this.unitInfoMap, this.pathMapper,
-      this.edits, this.optOutUnitPaths, this.logger);
-
-  /// Applies this migration to disk.
-  void apply() {
-    logger!.stdout('Applying migration suggestions to disk...');
-    var migratedFiles = [];
-    for (final fileEdit in edits) {
-      var unit = unitInfoMap[fileEdit.file];
-      // Decide whether to opt out; default to `false` files not included in
-      // [edits], like [pubspec.yaml].
-      var unitIsOptOut = unit != null
-          ? optOutUnitPaths.contains(migrationInfo!.computeName(unit))
-          : false;
-      if (!unitIsOptOut) {
-        final file = pathMapper!.provider.getFile(fileEdit.file);
-        var code = file.exists ? file.readAsStringSync() : '';
-        code = SourceEdit.applySequence(code, fileEdit.edits);
-        file.writeAsStringSync(code);
-        migratedFiles.add(migrationInfo!.relativePathFromRoot(fileEdit.file));
-      }
-    }
-
-    // A file which is to be opted out may not be found in [edits], if all types
-    // were to be made non-nullable, etc. Iterate over [optOutUnitPaths] instead
-    // of [edits] to opt files out.
-    var newlyOptedOutFiles = [];
-    var keptOptedOutFiles = [];
-    for (var optOutUnitPath in optOutUnitPaths) {
-      var absolutePath = migrationInfo!.absolutePathFromRoot(optOutUnitPath);
-      var unit = unitInfoMap[absolutePath]!;
-      if (unit.wasExplicitlyOptedOut) {
-        // This unit was explicitly opted out of null safety with a Dart
-        // Language version comment. Leave the unit be.
-        keptOptedOutFiles.add(optOutUnitPath);
-      } else {
-        // This unit was not yet migrated at the start, was not explicitly
-        // opted out at the start, and is being opted out now. Add a Dart
-        // Language version comment.
-        final file = pathMapper!.provider.getFile(absolutePath);
-        var code = file.exists ? file.readAsStringSync() : '';
-        file.writeAsStringSync(optCodeOutOfNullSafety(code));
-        newlyOptedOutFiles.add(optOutUnitPath);
-      }
-    }
-
-    _logFileStatus(migratedFiles, (text) => 'Migrated $text');
-    _logFileStatus(
-        newlyOptedOutFiles,
-        (text) =>
-            'Opted $text out of null safety with a new Dart language version '
-            'comment');
-    _logFileStatus(
-        keptOptedOutFiles, (text) => 'Kept $text opted out of null safety');
-  }
-
-  void _logFileStatus(
-      List files, String Function(String text) template) {
-    if (files.isNotEmpty) {
-      var count = files.length;
-      if (count <= 20) {
-        var s = count > 1 ? 's' : '';
-        var text = '$count file$s';
-        logger!.stdout('${template(text)}:');
-        for (var path in files) {
-          logger!.stdout('    $path');
-        }
-      } else {
-        var text = '$count files';
-        logger!.stdout('${template(text)}.');
-      }
-    }
-  }
-
-  @visibleForTesting
-  static String optCodeOutOfNullSafety(String code) {
-    var newline = '\n';
-    var length = code.length;
-
-    if (length == 0) {
-      return '// @dart=2.9';
-    }
-
-    var index = 0;
-
-    // Returns the next line and updates [index].
-    //
-    // After this function returns, [index] points to the character after the
-    // end of the line which was returned.
-    String getLine() {
-      var nextIndex = code.indexOf('\n', index);
-      if (nextIndex < 0) {
-        // Last line.
-        var line = code.substring(index);
-        index = length;
-        return line;
-      }
-      var line = code.substring(index, nextIndex);
-      index = nextIndex + 1;
-      return line;
-    }
-
-    // Skip past blank lines.
-    var line = getLine();
-    if (code.codeUnitAt(index - 1) == $lf) {
-      if (index - 2 >= 0 && code.codeUnitAt(index - 2) == $cr) {
-        // Looks like Windows-style line endings ("\r\n"). Use "\r\n" for all
-        // inserted line endings.
-        newline = '\r\n';
-      }
-    }
-    var lineStart = line.indexOf(_nonWhitespaceChar);
-    while (lineStart < 0) {
-      line = getLine();
-      if (index == length) {
-        // [code] consists _only_ of blank lines.
-        return '// @dart=2.9$newline$newline$code';
-      }
-      lineStart = line.indexOf(_nonWhitespaceChar);
-    }
-
-    // [line] is the first non-blank line.
-    if (line.length > lineStart + 1 &&
-        line.codeUnitAt(lineStart) == $slash &&
-        line.codeUnitAt(lineStart + 1) == $slash) {
-      // [line] is a comment.
-
-      if (index == length) {
-        // [code] consists _only_ of one comment line.
-        return '$code$newline$newline// @dart=2.9$newline';
-      }
-      var previousLineIndex = index;
-      String newlinesAfterDlvc;
-      while (true) {
-        previousLineIndex = index;
-        line = getLine();
-        lineStart = line.indexOf(_nonWhitespaceChar);
-        if (lineStart < 0) {
-          // Line of zero-or-more whitespace; end of block comment.
-          newlinesAfterDlvc = newline;
-          break;
-        }
-        if (line.length <= lineStart + 1) {
-          // Only one character; not a comment; end of block comment.
-          newlinesAfterDlvc = '$newline$newline';
-          break;
-        }
-        if (line.codeUnitAt(lineStart) == $slash &&
-            line.codeUnitAt(lineStart + 1) == $slash) {
-          // Comment line.
-          if (index == length) {
-            // [code] consists _only_ of this block comment.
-            return '$code$newline$newline// @dart=2.9$newline';
-          }
-          continue;
-        } else {
-          // Non-blank, non-comment line.
-          newlinesAfterDlvc = '$newline$newline';
-          break;
-        }
-      }
-      // [previousLineIndex] points to the start of [line], which is the first
-      // non-comment line following the first comment.
-      return '${code.substring(0, previousLineIndex)}$newline'
-          '// @dart=2.9$newlinesAfterDlvc'
-          '${code.substring(previousLineIndex)}';
-    } else {
-      // [code] does not start with a block comment.
-      return '// @dart=2.9$newline$newline$code';
-    }
-  }
-}
-
-/// The site used to serve pages for the preview tool.
-class PreviewSite extends Site
-    implements AbstractGetHandler, AbstractPostHandler {
-  /// The path of the CSS page used to style the semantic highlighting within a
-  /// Dart file.
-  static const highlightCssPath = '/highlight.css';
-
-  /// The path of the JS page used to associate highlighting within a Dart file.
-  static const highlightJsPath = '/highlight.pack.js';
-
-  /// The path of the Dart logo displayed in the toolbar.
-  static const dartLogoPath = '/dart_192.png';
-
-  /// The path of the Material icons font.
-  static const materialIconsPath = '/MaterialIconsRegular.ttf';
-
-  /// The path of the Roboto font.
-  static const robotoFontPath = '/RobotoRegular.ttf';
-
-  /// The path of the Roboto Mono font.
-  static const robotoMonoFontPath = '/RobotoMonoRegular.ttf';
-
-  static const navigationTreePath = '/_preview/navigationTree.json';
-
-  static const applyHintPath = '/apply-hint';
-
-  static const applyMigrationPath = '/apply-migration';
-
-  static const rerunMigrationPath = '/rerun-migration';
-
-  /// The state of the migration being previewed.
-  MigrationState? migrationState;
-
-  /// A table mapping the paths of files to the information about the
-  /// compilation units at those paths.
-  final Map unitInfoMap = {};
-
-  // A function provided by DartFix to rerun the migration.
-  final Future Function() rerunFunction;
-
-  /// Callback function that should be invoked after successfully applying
-  /// migration.
-  final void Function() applyHook;
-
-  final Logger? logger;
-
-  final String serviceAuthToken = _makeAuthToken();
-
-  /// Initialize a newly created site to serve a preview of the results of an
-  /// NNBD migration.
-  PreviewSite(
-      this.migrationState, this.rerunFunction, this.applyHook, this.logger)
-      : super('Null Safety Migration Preview') {
-    reset();
-  }
-
-  /// Return the information about the migration that will be used to serve up
-  /// pages.
-  MigrationInfo? get migrationInfo => migrationState!.migrationInfo;
-
-  /// Return the path mapper used to map paths from the unit infos to the paths
-  /// being served.
-  PathMapper? get pathMapper => migrationState!.pathMapper;
-
-  @override
-  Page createExceptionPage(String message, StackTrace trace) {
-    // Use createExceptionPageWithPath instead.
-    throw UnimplementedError();
-  }
-
-  /// Return a page used to display an exception that occurred while attempting
-  /// to render another page. The [path] is the path to the page that was being
-  /// rendered when the exception was thrown. The [message] and [stackTrace] are
-  /// those from the exception.
-  Page createExceptionPageWithPath(
-      String path, String message, StackTrace stackTrace) {
-    return ExceptionPage(this, path, message, stackTrace);
-  }
-
-  /// Return a page used to display an exception that occurred while attempting
-  /// to render another page. The [path] is the path to the page that was being
-  /// rendered when the exception was thrown. The [message] and [stackTrace] are
-  /// those from the exception.
-  Page createJsonExceptionResponse(
-      String path, String message, StackTrace stackTrace) {
-    return ExceptionPage(this, path, message, stackTrace);
-  }
-
-  Page createUnauthorizedPage(String unauthorizedPath) {
-    return UnauthorizedPage(this, unauthorizedPath.substring(1));
-  }
-
-  @override
-  Page createUnknownPage(String unknownPath) {
-    return NotFoundPage(this, unknownPath.substring(1));
-  }
-
-  @override
-  Future handleGetRequest(HttpRequest request) async {
-    var uri = request.uri;
-    var path = uri.path;
-    var decodedPath = pathMapper!.reverseMap(uri);
-    try {
-      if (path == highlightCssPath) {
-        // Note: `return await` needed due to
-        // https://github.com/dart-lang/sdk/issues/39204
-        return await respond(request, HighlightCssPage(this));
-      } else if (path == highlightJsPath) {
-        // Note: `return await` needed due to
-        // https://github.com/dart-lang/sdk/issues/39204
-        return await respond(request, HighlightJSPage(this));
-      } else if (path == navigationTreePath) {
-        // Note: `return await` needed due to
-        // https://github.com/dart-lang/sdk/issues/39204
-        return await respond(request, NavigationTreePage(this));
-      } else if (path == dartLogoPath) {
-        // Note: `return await` needed due to
-        // https://github.com/dart-lang/sdk/issues/39204
-        return await respond(request, DartLogoPage(this));
-      } else if (path == materialIconsPath) {
-        // Note: `return await` needed due to
-        // https://github.com/dart-lang/sdk/issues/39204
-        return await respond(request, MaterialIconsPage(this));
-      } else if (path == robotoFontPath) {
-        // Note: `return await` needed due to
-        // https://github.com/dart-lang/sdk/issues/39204
-        return await respond(request, RobotoPage(this));
-      } else if (path == robotoMonoFontPath) {
-        // Note: `return await` needed due to
-        // https://github.com/dart-lang/sdk/issues/39204
-        return await respond(request, RobotoMonoPage(this));
-      } else if (path == '/' ||
-          decodedPath == migrationInfo!.includedRoot ||
-          decodedPath ==
-              '${migrationInfo!.includedRoot}${pathMapper!.separator}') {
-        // Note: `return await` needed due to
-        // https://github.com/dart-lang/sdk/issues/39204
-        return await respond(request, IndexFilePage(this));
-      }
-
-      var unitInfo = unitInfoMap[decodedPath];
-      if (unitInfo != null) {
-        if (uri.queryParameters.containsKey('inline')) {
-          // Note: `return await` needed due to
-          // https://github.com/dart-lang/sdk/issues/39204
-          return await respond(request, DartFilePage(this, unitInfo));
-        } else if (uri.queryParameters.containsKey('region')) {
-          // Note: `return await` needed due to
-          // https://github.com/dart-lang/sdk/issues/39204
-          return await respond(request, RegionPage(this, unitInfo));
-        } else {
-          // Note: `return await` needed due to
-          // https://github.com/dart-lang/sdk/issues/39204
-          return await respond(request, IndexFilePage(this));
-        }
-      }
-      // Note: `return await` needed due to
-      // https://github.com/dart-lang/sdk/issues/39204
-      return await respond(
-          request, createUnknownPage(path), HttpStatus.notFound);
-    } catch (exception, stackTrace) {
-      _respondInternalError(request, path, exception, stackTrace);
-    }
-  }
-
-  @override
-  Future handlePostRequest(HttpRequest request) async {
-    var uri = request.uri;
-    var path = uri.path;
-    try {
-      // All POST requests must be authorized.
-      if (!_isAuthorized(request)) {
-        return _respondUnauthorized(request);
-      }
-      if (path == applyMigrationPath) {
-        var navigationTree =
-            ((await requestBodyJson(request))['navigationTree'] as List)
-                .map((encoded) => NavigationTreeNode.fromJson(encoded));
-        performApply(navigationTree);
-
-        respondOk(request);
-        return;
-      } else if (path == rerunMigrationPath) {
-        await rerunMigration();
-
-        if (migrationState!.hasErrors) {
-          return await respondJson(
-              request,
-              {
-                'success': false,
-                'errors': migrationState!.analysisResult!.toJson(),
-              },
-              HttpStatus.ok);
-        } else {
-          respondOk(request);
-        }
-        return;
-      } else if (path == applyHintPath) {
-        final hintAction = HintAction.fromJson(await requestBodyJson(request));
-        await performHintAction(hintAction);
-        respondOk(request);
-        return;
-      } else if (uri.queryParameters.containsKey('replacement')) {
-        await performEdit(uri);
-
-        respondOk(request);
-        return;
-      }
-    } catch (exception, stackTrace) {
-      _respondInternalError(request, path, exception, stackTrace);
-    }
-  }
-
-  /// Perform the migration.
-  void performApply(Iterable navigationTree) {
-    if (migrationState!.hasBeenApplied) {
-      throw StateError(
-          'It looks like this migration has already been applied. Try'
-          ' restarting the migration tool if this is not the case.');
-    }
-
-    final edits = migrationState!.listener!.sourceChange.edits;
-
-    // Perform a full check that no files have changed before touching the disk.
-    for (final fileEdit in edits) {
-      final file = pathMapper!.provider.getFile(fileEdit.file);
-      if (!file.path.endsWith('.dart')) {
-        continue;
-      }
-      var unitInfo = unitInfoMap[file.path];
-      if (unitInfo == null) {
-        // No disk content was recorded for this path at the time migration was
-        // performed.  This usually happens because the file is an unreferenced
-        // part (and therefore it didn't contribute to the migration at all). So
-        // just skip this file.
-        continue;
-      }
-      var code = file.exists ? file.readAsStringSync() : '';
-      if (!unitInfo.hadDiskContent(code)) {
-        throw StateError('Cannot apply migration. Files on disk do not match'
-            ' the expected pre-migration state. Press the "rerun from sources"'
-            ' button and then try again. (Changed file path is ${file.path})');
-      }
-    }
-
-    // Eagerly mark the migration applied. If this throws, we cannot go back.
-    migrationState!.markApplied();
-    IncrementalPlan(migrationInfo, unitInfoMap, pathMapper, edits,
-            navigationTree, logger)
-        .apply();
-    applyHook();
-  }
-
-  /// Perform the edit indicated by the [uri].
-  Future performEdit(Uri uri) async {
-    //
-    // Update the code on disk.
-    //
-    var params = uri.queryParameters;
-    var path = pathMapper!.reverseMap(uri);
-    var offset = int.parse(params['offset']!);
-    var end = int.parse(params['end']!);
-    var replacement = params['replacement']!;
-    var file = pathMapper!.provider.getFile(path);
-    var diskContent = file.readAsStringSync();
-    if (!unitInfoMap[path]!.hadDiskContent(diskContent)) {
-      throw StateError('Cannot perform edit. This file has been changed since'
-          ' last migration run. Press the "rerun from sources" button and then'
-          ' try again. (Changed file path is ${file.path})');
-    }
-    final unitInfo = unitInfoMap[path]!;
-    final diskMapper = unitInfo.diskChangesOffsetMapper;
-    final diskOffsetStart = diskMapper.map(offset);
-    final diskOffsetEnd = diskMapper.map(end);
-    if (diskOffsetStart == null || diskOffsetEnd == null) {
-      throw StateError('Cannot perform edit. Relevant code has been deleted by'
-          ' a previous hint action. Rerun the migration and try again.');
-    }
-    unitInfo.handleSourceEdit(SourceEdit(offset, end - offset, replacement));
-    migrationState!.needsRerun = true;
-    var newContent =
-        diskContent.replaceRange(diskOffsetStart, diskOffsetEnd, replacement);
-    file.writeAsStringSync(newContent);
-    unitInfo.diskContent = newContent;
-  }
-
-  /// Perform the hint edit indicated by the [hintAction].
-  Future performHintAction(HintAction hintAction) async {
-    final node = migrationState!.nodeMapper.nodeForId(hintAction.nodeId)!;
-    final edits = node.hintActions[hintAction.kind];
-    if (edits == null) {
-      throw StateError('This edit was not available to perform.');
-    }
-    //
-    // Update the code on disk.
-    //
-    var path = node.codeReference!.path;
-    var file = pathMapper!.provider.getFile(path);
-    var diskContent = file.readAsStringSync();
-    if (!unitInfoMap[path]!.hadDiskContent(diskContent)) {
-      throw StateError('Cannot perform edit. This file has been changed since'
-          ' last migration run. Press the "rerun from sources" button and then'
-          ' try again. (Changed file path is ${file.path})');
-    }
-    final unitInfo = unitInfoMap[path]!;
-    final diskMapper = unitInfo.diskChangesOffsetMapper;
-    var newContent = diskContent;
-    migrationState!.needsRerun = true;
-    for (final entry in edits.entries) {
-      final offset = entry.key!;
-      final edits = entry.value;
-      final diskOffset = diskMapper.map(offset);
-      if (diskOffset == null) {
-        throw StateError(
-            'Cannot perform edit. Relevant code has been deleted by'
-            ' a previous hint action. Rerun the migration and try again.');
-      }
-      final unmappedSourceEdit = edits.toSourceEdit(offset);
-      final diskSourceEdit = edits.toSourceEdit(diskMapper.map(offset)!);
-      unitInfo.handleSourceEdit(unmappedSourceEdit);
-      newContent = diskSourceEdit.apply(newContent);
-    }
-    file.writeAsStringSync(newContent);
-    unitInfo.diskContent = newContent;
-  }
-
-  Future> requestBodyJson(HttpRequest request) async =>
-      (await request
-          .map((entry) => entry.map((i) => i.toInt()).toList())
-          .transform(Utf8Decoder())
-          .transform(JsonDecoder())
-          .single) as Map;
-
-  Future rerunMigration() async {
-    migrationState = await rerunFunction();
-    if (!migrationState!.hasErrors) {
-      reset();
-    }
-  }
-
-  void reset() {
-    unitInfoMap.clear();
-    var unitInfos = migrationInfo!.units!;
-    var provider = pathMapper!.provider;
-    for (var unit in unitInfos) {
-      unitInfoMap[unit.path] = unit;
-    }
-    for (var unit in migrationInfo!.unitMap.values) {
-      if (!unitInfos.contains(unit)) {
-        if (unit.content == null) {
-          try {
-            unit.content = provider.getFile(unit.path!).readAsStringSync();
-          } catch (_) {
-            // If we can't read the content of the file, then skip it.
-            continue;
-          }
-        }
-        unitInfoMap[unit.path] = unit;
-      }
-    }
-  }
-
-  @override
-  Future respond(HttpRequest request, Page page,
-      [int code = HttpStatus.ok]) async {
-    if (page is PreviewPage && page.requiresAuth) {
-      if (!_isAuthorized(request)) {
-        return _respondUnauthorized(request);
-      }
-    }
-    var response = request.response;
-    response.statusCode = code;
-    if (page is HighlightCssPage) {
-      response.headers.contentType =
-          ContentType('text', 'css', charset: 'utf-8');
-    } else if (page is HighlightJSPage) {
-      response.headers.contentType =
-          ContentType('application', 'javascript', charset: 'utf-8');
-    } else if (page is DartLogoPage) {
-      response.headers.contentType = ContentType('image', 'png');
-    } else if (page is MaterialIconsPage ||
-        page is RobotoPage ||
-        page is RobotoMonoPage) {
-      response.headers.contentType = ContentType('font', 'ttf');
-    } else {
-      response.headers.contentType = ContentType.html;
-    }
-    response.write(await page.generate(request.uri.queryParameters));
-    response.close();
-  }
-
-  /// Returns whether [request] is an authorized request.
-  bool _isAuthorized(HttpRequest request) {
-    var authToken = request.uri.queryParameters['authToken'];
-    return authToken == serviceAuthToken;
-  }
-
-  Future _respondInternalError(HttpRequest request, String path,
-      dynamic exception, StackTrace stackTrace) async {
-    try {
-      if (request.headers.contentType!.subType == 'json') {
-        return await respondJson(
-            request,
-            {
-              'success': false,
-              'exception': exception.toString(),
-              'stackTrace': stackTrace.toString(),
-            },
-            HttpStatus.internalServerError);
-      }
-      await respond(
-          request,
-          createExceptionPageWithPath(path, '$exception', stackTrace),
-          HttpStatus.internalServerError);
-    } catch (exception, stackTrace) {
-      var response = request.response;
-      response.statusCode = HttpStatus.internalServerError;
-      response.headers.contentType = ContentType.text;
-      response.write('$exception\n\n$stackTrace');
-      response.close();
-    }
-  }
-
-  /// Responds with a 401 Unauthorized response.
-  Future _respondUnauthorized(HttpRequest request) async {
-    var page = createUnauthorizedPage(request.uri.path);
-    var response = request.response;
-    response
-      ..statusCode = HttpStatus.unauthorized
-      ..headers.contentType = ContentType.html
-      ..write(await page.generate(request.uri.queryParameters))
-      ..close();
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/region_page.dart b/pkg/nnbd_migration/lib/src/preview/region_page.dart
deleted file mode 100644
index 2a6ac8fe9629..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/region_page.dart
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert' show jsonEncode;
-
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/region_renderer.dart';
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The HTML that is displayed for a region of code.
-class RegionPage extends PreviewPage {
-  /// The compilation unit information containing the region.
-  final UnitInfo unitInfo;
-
-  /// Initialize a newly created region page within the given [site]. The
-  /// [unitInfo] provides the information needed to render the page.
-  RegionPage(PreviewSite site, this.unitInfo)
-      : super(site, unitInfo.path!.substring(1));
-
-  @override
-  bool get requiresAuth => true;
-
-  @override
-  void generateBody(Map params) {
-    throw UnsupportedError('generateBody');
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    var region = unitInfo.regionAt(int.parse(params['offset']!));
-    var renderer = RegionRenderer(region, unitInfo, site.migrationInfo,
-        site.pathMapper, site.serviceAuthToken);
-    buf.write(jsonEncode(renderer.render().toJson()));
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/roboto_mono_page.dart b/pkg/nnbd_migration/lib/src/preview/roboto_mono_page.dart
deleted file mode 100644
index dbcaeb0f2345..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/roboto_mono_page.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/resources/resources.g.dart'
-    as resources;
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that contains the CSS used to style the semantic highlighting
-/// within a Dart file.
-class RobotoMonoPage extends PreviewPage {
-  /// Initialize a newly created CSS page within the given [site].
-  RobotoMonoPage(PreviewSite site)
-      : super(site, PreviewSite.robotoMonoFontPath.substring(1));
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    throw UnimplementedError();
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    buf.write(resources.RobotoMonoRegular_ttf);
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/roboto_page.dart b/pkg/nnbd_migration/lib/src/preview/roboto_page.dart
deleted file mode 100644
index d7ea886bb882..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/roboto_page.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/resources/resources.g.dart'
-    as resources;
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-
-/// The page that contains the CSS used to style the semantic highlighting
-/// within a Dart file.
-class RobotoPage extends PreviewPage {
-  /// Initialize a newly created CSS page within the given [site].
-  RobotoPage(PreviewSite site)
-      : super(site, PreviewSite.robotoFontPath.substring(1));
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    throw UnimplementedError();
-  }
-
-  @override
-  Future generatePage(Map params) async {
-    buf.write(resources.RobotoRegular_ttf);
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/preview/unauthorized_page.dart b/pkg/nnbd_migration/lib/src/preview/unauthorized_page.dart
deleted file mode 100644
index 7b6beb12c903..000000000000
--- a/pkg/nnbd_migration/lib/src/preview/unauthorized_page.dart
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/preview/preview_page.dart';
-
-/// The page that is displayed when a request could not be authenticated.
-class UnauthorizedPage extends PreviewPage {
-  /// Initialize a newly created unauthorized page within the given [site].
-  /// The [id] is the portion of the path to the page that follows the initial
-  /// slash ('/').
-  UnauthorizedPage(super.site, String super.id);
-
-  @override
-  bool get requiresAuth => false;
-
-  @override
-  void generateBody(Map params) {
-    buf.write('''
-
401 Unauthorized

-

-Request for '$path' is unauthorized.
-

-''');
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/annotation_tracker.dart b/pkg/nnbd_migration/lib/src/utilities/annotation_tracker.dart
deleted file mode 100644
index 2b7e6d249177..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/annotation_tracker.dart
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/visitor.dart';
-
-/// A simple class to find all [Annotation]s and track if they all get visited.
-class AnnotationTracker extends RecursiveAstVisitor {
-  final Set _nodes = {};
-
-  void finalize() {
-    assert(_nodes.isEmpty, 'Annotation nodes not visited: $_nodes');
-  }
-
-  void nodeVisited(Annotation node) {
-    if (!_nodes.remove(node)) {
-      throw StateError('Visited unexpected annotation $node');
-    }
-  }
-
-  @override
-  void visitAnnotation(Annotation node) {
-    _nodes.add(node);
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/built_value_transformer.dart b/pkg/nnbd_migration/lib/src/utilities/built_value_transformer.dart
deleted file mode 100644
index c4ed06fd419f..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/built_value_transformer.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-
-class BuiltValueTransformer {
-  static Annotation? findNullableAnnotation(MethodDeclaration node) {
-    if (node.isGetter && node.isAbstract) {
-      for (var annotation in node.metadata) {
-        if (annotation.arguments == null) {
-          var element = annotation.element;
-          if (element is PropertyAccessorElement &&
-              element.name == 'nullable') {
-            if (element.enclosingElement is CompilationUnitElement) {
-              if (element.library.source.uri.toString() ==
-                  'package:built_value/built_value.dart') {
-                return annotation;
-              }
-            }
-          }
-        }
-      }
-    }
-    return null;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/completeness_tracker.dart b/pkg/nnbd_migration/lib/src/utilities/completeness_tracker.dart
deleted file mode 100644
index d43b180fcfa8..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/completeness_tracker.dart
+++ /dev/null
@@ -1,65 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:nnbd_migration/src/utilities/annotation_tracker.dart';
-import 'package:nnbd_migration/src/utilities/named_type_tracker.dart';
-import 'package:nnbd_migration/src/utilities/permissive_mode.dart';
-
-/// Mixin that verifies (via assertion checks) that a visitor visits a
-/// compilation unit to "completeness" -- currently tracks Annotations and
-/// TypeNames.
-///
-/// Mixing in this class should have very low overhead when assertions are
-/// disabled.
-mixin CompletenessTracker on AstVisitor, PermissiveModeVisitor {
-  AnnotationTracker? _annotationTracker;
-  NamedTypeTracker? _namedTypeTracker;
-
-  void annotationVisited(Annotation node) {
-    assert(() {
-      _annotationTracker!.nodeVisited(node);
-      return true;
-    }());
-  }
-
-  void namedTypeVisited(NamedType node) {
-    assert(() {
-      _namedTypeTracker!.nodeVisited(node);
-      return true;
-    }());
-  }
-
-  @override
-  T? visitAnnotation(Annotation node) {
-    annotationVisited(node);
-    return super.visitAnnotation(node);
-  }
-
-  @override
-  T? visitCompilationUnit(CompilationUnit node) {
-    T? result;
-    reportExceptionsIfPermissive(node, () {
-      assert(() {
-        assert(_annotationTracker == null);
-        assert(_namedTypeTracker == null);
-        _annotationTracker = AnnotationTracker()..visitCompilationUnit(node);
-        _namedTypeTracker = NamedTypeTracker()..visitCompilationUnit(node);
-        return true;
-      }());
-      try {
-        result = super.visitCompilationUnit(node);
-        assert(() {
-          _annotationTracker!.finalize();
-          _namedTypeTracker!.finalize();
-          return true;
-        }());
-      } finally {
-        _annotationTracker = null;
-        _namedTypeTracker = null;
-      }
-    });
-    return result;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/hint_utils.dart b/pkg/nnbd_migration/lib/src/utilities/hint_utils.dart
deleted file mode 100644
index a6585e600de6..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/hint_utils.dart
+++ /dev/null
@@ -1,267 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:_fe_analyzer_shared/src/scanner/token.dart';
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-
-/// Determines if the given [token] is followed by a nullability hint, and if
-/// so, returns information about it.  Otherwise returns `null`.
-HintComment? getPostfixHint(Token token) {
-  var commentToken = token.next!.precedingComments;
-  if (commentToken != null) {
-    HintCommentKind kind;
-    if (commentToken.lexeme == '/*!*/') {
-      kind = HintCommentKind.bang;
-    } else if (commentToken.lexeme == '/*?*/') {
-      kind = HintCommentKind.question;
-    } else {
-      return null;
-    }
-    return HintComment(
-        kind,
-        token.end,
-        commentToken.offset,
-        commentToken.offset + '/*'.length,
-        commentToken.end - '*/'.length,
-        commentToken.end,
-        commentToken.end);
-  }
-  return null;
-}
-
-/// Determines if the given [token] is preceded by a hint, and if so, returns
-/// information about it.  Otherwise returns `null`.
-HintComment? getPrefixHint(Token token) {
-  Token? commentToken = token.precedingComments;
-  if (commentToken != null) {
-    while (true) {
-      var nextComment = commentToken!.next;
-      if (nextComment == null) break;
-      commentToken = nextComment;
-    }
-    var lexeme = commentToken.lexeme;
-    if (lexeme.startsWith('/*') &&
-        lexeme.endsWith('*/') &&
-        lexeme.length >= '/*late*/'.length) {
-      var commentText =
-          lexeme.substring('/*'.length, lexeme.length - '*/'.length).trim();
-      var commentOffset = commentToken.offset;
-      if (commentText == 'late') {
-        var lateOffset = commentOffset + commentToken.lexeme.indexOf('late');
-        return HintComment(
-            HintCommentKind.late_,
-            commentOffset,
-            commentOffset,
-            lateOffset,
-            lateOffset + 'late'.length,
-            commentToken.end,
-            token.offset);
-      } else if (commentText == 'late final') {
-        var lateOffset = commentOffset + commentToken.lexeme.indexOf('late');
-        return HintComment(
-            HintCommentKind.lateFinal,
-            commentOffset,
-            commentOffset,
-            lateOffset,
-            lateOffset + 'late final'.length,
-            commentToken.end,
-            token.offset);
-      } else if (commentText == 'required') {
-        var requiredOffset =
-            commentOffset + commentToken.lexeme.indexOf('required');
-        return HintComment(
-            HintCommentKind.required,
-            commentOffset,
-            commentOffset,
-            requiredOffset,
-            requiredOffset + 'required'.length,
-            commentToken.end,
-            token.offset);
-      }
-    }
-  }
-  return null;
-}
-
-/// Information about a hint found in a source file.
-class HintComment {
-  static final _identifierCharRegexp = RegExp('[a-zA-Z0-9_]');
-
-  /// What kind of hint this is.
-  final HintCommentKind kind;
-
-  /// The file offset of the first character that should be removed if the hint
-  /// is to be removed.
-  final int _removeOffset;
-
-  /// The file offset of the first character of the hint comment itself.
-  final int _commentOffset;
-
-  /// The file offset of the first character that should be kept if the hint is
-  /// to be replaced with the hinted text.
-  final int _keepOffset;
-
-  /// The file offset just beyond the last character that should be kept if the
-  /// hint is to be replaced with the hinted text.
-  final int _keepEnd;
-
-  /// The file offset just beyond the last character of the hint comment itself.
-  final int _commentEnd;
-
-  /// The file offset just beyond the last character that should be removed if
-  /// the hint is to be removed.
-  final int _removeEnd;
-
-  HintComment(this.kind, this._removeOffset, this._commentOffset,
-      this._keepOffset, this._keepEnd, this._commentEnd, this._removeEnd)
-      : assert(_removeOffset <= _commentOffset),
-        assert(_commentOffset < _keepOffset),
-        assert(_keepOffset < _keepEnd),
-        assert(_keepEnd < _commentEnd),
-        assert(_commentEnd <= _removeEnd);
-
-  /// Creates the changes necessary to accept the given hint (replace it with
-  /// its contents and fix up whitespace).
-  Map> changesToAccept(String? sourceText,
-      {AtomicEditInfo? info}) {
-    bool prependSpace = false;
-    bool appendSpace = false;
-    var removeOffset = _removeOffset;
-    var removeEnd = _removeEnd;
-    if (_isIdentifierCharBeforeOffset(sourceText, removeOffset) &&
-        _isIdentifierCharAtOffset(sourceText!, _keepOffset)) {
-      if (sourceText[removeOffset] == ' ') {
-        // We can just keep this space.
-        removeOffset++;
-      } else {
-        prependSpace = true;
-      }
-    }
-    if (_isIdentifierCharBeforeOffset(sourceText, _keepEnd) &&
-        _isIdentifierCharAtOffset(sourceText!, removeEnd)) {
-      if (sourceText[removeEnd - 1] == ' ') {
-        // We can just keep this space.
-        removeEnd--;
-      } else {
-        appendSpace = true;
-      }
-    }
-
-    return {
-      removeOffset: [
-        if (prependSpace) AtomicEdit.insert(' '),
-        AtomicEdit.delete(_keepOffset - removeOffset, info: info)
-      ],
-      _keepEnd: [AtomicEdit.delete(removeEnd - _keepEnd, info: info)],
-      if (appendSpace) removeEnd: [AtomicEdit.insert(' ')]
-    };
-  }
-
-  /// Creates the changes necessary to remove the given hint (and fix up
-  /// whitespace).
-  Map> changesToRemove(String? sourceText,
-      {AtomicEditInfo? info}) {
-    bool appendSpace = false;
-    var removeOffset = _removeOffset;
-    if (_isIdentifierCharBeforeOffset(sourceText, removeOffset) &&
-        _isIdentifierCharAtOffset(sourceText!, _removeEnd)) {
-      if (sourceText[removeOffset] == ' ') {
-        // We can just keep this space.
-        removeOffset++;
-      } else {
-        appendSpace = true;
-      }
-    }
-    return {
-      removeOffset: [
-        AtomicEdit.delete(_removeEnd - removeOffset, info: info),
-        if (appendSpace) AtomicEdit.insert(' ')
-      ]
-    };
-  }
-
-  /// Creates the changes necessary to replace the given hint with a different
-  /// hint.
-  Map> changesToReplace(
-      String? sourceText, String replacement,
-      {AtomicEditInfo? info}) {
-    return {
-      _commentOffset: [
-        AtomicEdit.replace(_commentEnd - _commentOffset, replacement,
-            info: info)
-      ]
-    };
-  }
-
-  static bool _isIdentifierCharAtOffset(String sourceText, int offset) {
-    return offset < sourceText.length &&
-        _identifierCharRegexp.hasMatch(sourceText[offset]);
-  }
-
-  static bool _isIdentifierCharBeforeOffset(String? sourceText, int offset) {
-    return offset > 0 &&
-        _identifierCharRegexp.hasMatch(sourceText![offset - 1]);
-  }
-}
-
-/// Types of hint comments
-enum HintCommentKind {
-  /// The comment `/*!*/`, which indicates that the type should not have a `?`
-  /// appended.
-  bang,
-
-  /// The comment `/*?*/`, which indicates that the type should have a `?`
-  /// appended.
-  question,
-
-  /// The comment `/*late*/`, which indicates that the variable declaration
-  /// should be late.
-  late_,
-
-  /// The comment `/*late final*/`, which indicates that the variable
-  /// declaration should be late and final.
-  lateFinal,
-
-  /// The comment `/*required*/`, which indicates that the parameter should be
-  /// required.
-  required,
-}
-
-extension FormalParameterExtensions on FormalParameter {
-  // TODO(srawlins): Add this to FormalParameter interface.
-  Token? get firstTokenAfterCommentAndMetadata {
-    var parameter = this is DefaultFormalParameter
-        ? (this as DefaultFormalParameter).parameter
-        : this as NormalFormalParameter;
-    if (parameter is FieldFormalParameter) {
-      if (parameter.keyword != null) {
-        return parameter.keyword;
-      } else if (parameter.type != null) {
-        return parameter.type!.beginToken;
-      } else {
-        return parameter.thisKeyword;
-      }
-    } else if (parameter is FunctionTypedFormalParameter) {
-      if (parameter.covariantKeyword != null) {
-        return parameter.covariantKeyword;
-      } else if (parameter.returnType != null) {
-        return parameter.returnType!.beginToken;
-      } else {
-        return parameter.name;
-      }
-    } else if (parameter is SimpleFormalParameter) {
-      if (parameter.covariantKeyword != null) {
-        return parameter.covariantKeyword;
-      } else if (parameter.keyword != null) {
-        return parameter.keyword;
-      } else if (parameter.type != null) {
-        return parameter.type!.beginToken;
-      } else {
-        return parameter.name;
-      }
-    }
-    return null;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/json.dart b/pkg/nnbd_migration/lib/src/utilities/json.dart
deleted file mode 100644
index 732b9b0ef1a8..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/json.dart
+++ /dev/null
@@ -1,30 +0,0 @@
-/// Utilities for handling parsed JSON.
-///
-/// It is recommended to import this library with a prefix.
-library;
-
-/// Expects [map] to contain [key], a String key.
-///
-/// If [map] has key [key], return the value paired with [key]; otherwise throw
-/// a FormatException.
-dynamic expectKey(Map map, String key) {
-  if (map.containsKey(key)) {
-    return map[key];
-  }
-  throw FormatException(
-      'Unexpected `pub outdated` JSON output: missing key ($key)', map);
-}
-
-/// Expects [object] to be of type [T].
-///
-/// If [object] is of type [T], return it; otherwise throw a FormatException
-/// with [errorKey] in the message.
-T expectType(Object? object, String errorKey) {
-  if (object is T) {
-    return object;
-  }
-  throw FormatException(
-      'Unexpected `pub outdated` JSON output: expected a '
-      '$T at "$errorKey", but got a ${object.runtimeType}',
-      object);
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/multi_future_tracker.dart b/pkg/nnbd_migration/lib/src/utilities/multi_future_tracker.dart
deleted file mode 100644
index d40da273fece..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/multi_future_tracker.dart
+++ /dev/null
@@ -1,76 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:async';
-
-/// This library helps run parallel thread-like closures asynchronously.
-/// Borrowed from dartdoc:src/io_utils.dart.
-
-Future retryClosure(Future Function() closure,
-    {Duration baseInterval = const Duration(milliseconds: 200),
-    double factor = 2,
-    int retries = 5}) async {
-  Future handleError(Object _) async {
-    return await Future.delayed(
-        baseInterval,
-        () => retryClosure(closure,
-            baseInterval: baseInterval * factor,
-            factor: factor,
-            retries: retries - 1));
-  }
-
-  if (retries > 0) {
-    return await Future.sync(closure).catchError(handleError);
-  } else {
-    return closure();
-  }
-}
-
-// TODO(jcollins-g): like SubprocessLauncher, merge with io_utils in dartdoc
-// before cut-and-paste gets out of hand.
-class MultiFutureTracker {
-  /// Maximum number of simultaneously incomplete [Future]s.
-  final int parallel;
-
-  final Set> _trackedFutures = >{};
-
-  MultiFutureTracker(this.parallel);
-
-  /// Generates a [Future] from the given closure and adds it to the queue,
-  /// once the queue is sufficiently empty.  The returned future completes
-  /// when the generated [Future] has been added to the queue.
-  Future addFutureFromClosure(Future Function() closure) async {
-    assert(_trackedFutures.length <= parallel);
-    // Can't use _waitUntil because we might not return directly to this
-    // invocation of addFutureFromClosure.
-    while (_trackedFutures.length > parallel - 1) {
-      await Future.any(_trackedFutures);
-    }
-    Future future = closure();
-    _trackedFutures.add(future);
-    future.then((f) => _trackedFutures.remove(future));
-  }
-
-  /// Generates a [Future] from the given closure and adds it to the queue,
-  /// once the queue is sufficiently empty.  Completes when the generated
-  /// closure completes.
-  Future runFutureFromClosure(FutureOr? Function() closure) async {
-    Completer futureComplete = Completer();
-    await addFutureFromClosure(() async {
-      futureComplete.complete(await closure());
-    });
-    return futureComplete.future;
-  }
-
-  /// Wait until all futures added so far have completed.
-  Future wait() => _waitUntil(0);
-
-  /// Wait until fewer or equal to this many Futures are outstanding.
-  Future _waitUntil(int max) async {
-    assert(_trackedFutures.length <= parallel);
-    while (_trackedFutures.length > max) {
-      await Future.any(_trackedFutures);
-    }
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/named_type_tracker.dart b/pkg/nnbd_migration/lib/src/utilities/named_type_tracker.dart
deleted file mode 100644
index 8af9550154c7..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/named_type_tracker.dart
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/visitor.dart';
-
-/// A simple class to find all [NamedType]s and track if they all get visited.
-class NamedTypeTracker extends RecursiveAstVisitor {
-  final Set _nodes = {};
-
-  void finalize() {
-    assert(_nodes.isEmpty, 'Annotation nodes not visited: $_nodes');
-  }
-
-  void nodeVisited(NamedType node) {
-    if (_isTrueNamedType(node) && !_nodes.remove(node)) {
-      throw StateError('Visited unexpected type name $node');
-    }
-  }
-
-  @override
-  void visitNamedType(NamedType node) {
-    if (_isTrueNamedType(node)) {
-      _nodes.add(node);
-    }
-    super.visitNamedType(node);
-  }
-
-  bool _isTrueNamedType(NamedType node) {
-    final parent = node.parent;
-    if (parent is ConstructorName) {
-      // We only need to visit C in `new C()`, just `int` in `new C()`.
-      return parent.type != node;
-    }
-
-    return true;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/permissive_mode.dart b/pkg/nnbd_migration/lib/src/utilities/permissive_mode.dart
deleted file mode 100644
index 3e7a8974b73f..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/permissive_mode.dart
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/visitor.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-
-/// Mixin that catches exceptions when visiting an AST recursively, and reports
-/// them to an optional listener.  This is used to implement the migration
-/// tool's "permissive mode".
-///
-/// If the [listener] is `null`, exceptions are not caught.
-mixin PermissiveModeVisitor on GeneralizingAstVisitor {
-  NullabilityMigrationListener? get listener;
-
-  /// The file being analyzed.
-  Source? get source;
-
-  /// Executes [callback].  If [listener] is not `null`, and an exception
-  /// occurs, the exception is caught and reported to the [listener].
-  void reportExceptionsIfPermissive(AstNode node, void Function() callback) {
-    if (listener != null) {
-      try {
-        return callback();
-      } catch (exception, stackTrace) {
-        listener!.reportException(source, node, exception, stackTrace);
-      }
-    } else {
-      callback();
-    }
-  }
-
-  @override
-  T? visitNode(AstNode node) {
-    if (listener != null) {
-      try {
-        return super.visitNode(node);
-      } catch (exception, stackTrace) {
-        listener!.reportException(source, node, exception, stackTrace);
-        return null;
-      }
-    } else {
-      return super.visitNode(node);
-    }
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/progress_bar.dart b/pkg/nnbd_migration/lib/src/utilities/progress_bar.dart
deleted file mode 100644
index b4bce92e7bff..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/progress_bar.dart
+++ /dev/null
@@ -1,80 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:io' hide File;
-import 'dart:math';
-
-import 'package:cli_util/cli_logging.dart';
-
-/// A facility for drawing a progress bar in the terminal.
-///
-/// The bar is instantiated with the total number of "ticks" to be completed,
-/// and progress is made by calling [tick]. The bar is drawn across one entire
-/// line, like so:
-///
-///     [----------                                                   ]
-///
-/// The hyphens represent completed progress, and the whitespace represents
-/// remaining progress.
-///
-/// If there is no terminal, the progress bar will not be drawn.
-class ProgressBar {
-  /// Whether the progress bar should be drawn.
-  late bool _shouldDrawProgress;
-
-  /// The width of the terminal, in terms of characters.
-  late int _width;
-
-  final Logger _logger;
-
-  /// The inner width of the terminal, in terms of characters.
-  ///
-  /// This represents the number of characters available for drawing progress.
-  late int _innerWidth;
-
-  final int _totalTickCount;
-
-  int _tickCount = 0;
-
-  ProgressBar(this._logger, this._totalTickCount) {
-    if (!stdout.hasTerminal) {
-      _shouldDrawProgress = false;
-    } else {
-      _shouldDrawProgress = true;
-      _width = stdout.terminalColumns;
-      _innerWidth = stdout.terminalColumns - 2;
-      _logger.write('[${' ' * _innerWidth}]');
-    }
-  }
-
-  /// Clear the progress bar from the terminal, allowing other logging to be
-  /// printed.
-  void clear() {
-    if (!_shouldDrawProgress) {
-      return;
-    }
-    _logger.write('\r${' ' * _width}\r');
-  }
-
-  /// Draw the progress bar as complete, and print two newlines.
-  void complete() {
-    if (!_shouldDrawProgress) {
-      return;
-    }
-    _logger.write('\r[${'-' * _innerWidth}]\n\n');
-  }
-
-  /// Progress the bar by one tick.
-  void tick() {
-    if (!_shouldDrawProgress) {
-      return;
-    }
-    _tickCount++;
-    var fractionComplete =
-        max(0, _tickCount * _innerWidth ~/ _totalTickCount - 1);
-    var remaining = _innerWidth - fractionComplete - 1;
-    var spinner = AnsiProgress.kAnimationItems[_tickCount % 4];
-    _logger.write('\r[${'-' * fractionComplete}$spinner${' ' * remaining}]');
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/resolution_utils.dart b/pkg/nnbd_migration/lib/src/utilities/resolution_utils.dart
deleted file mode 100644
index 3971a35e5767..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/resolution_utils.dart
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-
-/// Determines whether a type annotation's position in the AST makes it
-/// impossible to be nullable.
-bool typeIsNonNullableByContext(TypeAnnotation node) {
-  var parent = node.parent;
-  return parent is ExtendsClause ||
-      parent is ImplementsClause ||
-      parent is WithClause ||
-      parent is OnClause ||
-      parent is ClassTypeAlias ||
-      parent is GenericTypeAlias ||
-      parent is ConstructorName;
-}
-
-/// This mixin provides utilities that are useful to visitors implementing
-/// resolution-like behaviors.
-mixin ResolutionUtils {
-  List? _objectGetNames;
-
-  TypeProvider get typeProvider;
-
-  /// Determines whether the given getter or method name is declared on
-  /// `Object` (and is hence valid to call on a nullable type).
-  bool isDeclaredOnObject(String name) =>
-      (_objectGetNames ??= _computeObjectGetNames()).contains(name);
-
-  List _computeObjectGetNames() {
-    var result = [];
-    var objectClass = typeProvider.objectType.element;
-    for (var accessor in objectClass.accessors) {
-      assert(accessor.isGetter);
-      assert(!accessor.name.startsWith('_'));
-      result.add(accessor.name);
-    }
-    for (var method in objectClass.methods) {
-      assert(!method.name.startsWith('_'));
-      result.add(method.name);
-    }
-    return result;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/scoped_set.dart b/pkg/nnbd_migration/lib/src/utilities/scoped_set.dart
deleted file mode 100644
index c422246ce870..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/scoped_set.dart
+++ /dev/null
@@ -1,78 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/// Tracks scopes of instances to be used by the [EdgeBuilder] for certain
-/// analyses.
-///
-/// For example, [EdgeBuilder] uses this to find post-dominating usages of
-/// locals and parameters to decide where to insert hard edges.
-///
-/// Currently does not implement Set because this has properties undesirable
-/// of a Set, such as state that means different things at different times, and
-/// some of the methods (such as `removeAll()`) may be ambiguous. However, it
-/// may be reasonable to do so, carefully, in the future.
-class ScopedSet {
-  /// The scope stack, where the last element is the current scope, and each
-  /// scope is a list of elements in that scope.
-  final _scopeStack = >[];
-
-  /// Get the current scope. Private so as not to expose to clients.
-  Set get _currentScope => _scopeStack.last;
-
-  /// Add element to the current scope (and not its parent scopes).
-  void add(T element) {
-    if (_scopeStack.isNotEmpty) {
-      _currentScope.add(element);
-    }
-  }
-
-  /// Clear each scope in the stack (the stack itself is not affected).
-  ///
-  /// This is useful in post-dominator analysis. Upon non-convergent branching,
-  /// all scopes of potentially post-dominated elements becomes empty.
-  void clearEachScope() {
-    for (var scope in _scopeStack) {
-      scope.clear();
-    }
-  }
-
-  /// Create a scope like [pushScope], and use it to perform some [action]
-  /// before popping it.
-  void doScoped(
-      {List elements = const [],
-      bool copyCurrent = false,
-      required void Function() action}) {
-    pushScope(elements: elements, copyCurrent: copyCurrent);
-    try {
-      action();
-    } finally {
-      popScope();
-    }
-  }
-
-  /// Look up if the element is in the scope.
-  bool isInScope(T element) =>
-      _scopeStack.isNotEmpty && _currentScope.contains(element);
-
-  /// End the current scope.
-  void popScope() {
-    assert(_scopeStack.isNotEmpty);
-    _scopeStack.removeLast();
-  }
-
-  /// Begin a new scope, optionally with some known starting [elements], or
-  /// copying the current scope, as a starting state.
-  void pushScope({List elements = const [], bool copyCurrent = false}) =>
-      _scopeStack.add({
-        ...elements,
-        if (copyCurrent) ..._currentScope,
-      });
-
-  /// Remove element from the current scope and all containing scopes.
-  void removeFromAllScopes(T t) {
-    for (var scope in _scopeStack) {
-      scope.remove(t);
-    }
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/source_edit_diff_formatter.dart b/pkg/nnbd_migration/lib/src/utilities/source_edit_diff_formatter.dart
deleted file mode 100644
index 5ad801809e1a..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/source_edit_diff_formatter.dart
+++ /dev/null
@@ -1,158 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:cli_util/cli_logging.dart';
-import 'package:meta/meta.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/utilities/source_edit_diff_output.dart';
-
-/// Information about the style in which we display diffs.
-abstract class DiffStyle {
-  /// Creates a DiffStyle suitable for use with a terminal whose ANSI support is
-  /// indicated by [ansi].
-  ///
-  /// If the terminal supports ANSI, we use a compact diff style with intra-line
-  /// diffs, where insertions are represented by green reversed text and
-  /// deletions are represented by red reversed text.
-  ///
-  /// If the terminal does not support ANSI, we use a traditional diff style
-  /// with before and after lines.
-  factory DiffStyle(Ansi ansi) = _DiffStyleForProduction;
-
-  /// Creates a DiffStyle suitable for unit testing.  Instead of using ANSI
-  /// escape codes for color coding, we use `{+` and `+}` to surround added
-  /// text, and `{-` and `-}` to surround deleted text.
-  @visibleForTesting
-  factory DiffStyle.forTesting(bool compact) = _DiffStyleForTesting;
-
-  DiffStyle._();
-
-  /// Formats a diff showing the result of applying the given [edits] to the
-  /// given [origText].
-  List formatDiff(String origText, Map> edits);
-}
-
-abstract class DiffStyleImpl extends DiffStyle {
-  DiffStyleImpl._() : super._();
-
-  String get bullet;
-
-  String deleted(String text);
-
-  @override
-  List formatDiff(String origText, Map> edits) {
-    var output = _createOutput();
-    int prevOffset = 0;
-    for (var offset in edits.keys.toList()..sort()) {
-      if (offset > prevOffset) {
-        var text = origText.substring(prevOffset, offset);
-        var splitText = text.split('\n');
-        output.addUnchangedText(splitText.first);
-        if (splitText.length > 1) {
-          output.skipUnchangedNewlines(splitText.length - 1);
-          output.addUnchangedText(splitText.last);
-        }
-        prevOffset = offset;
-      }
-      for (var edit in edits[offset]!) {
-        if (edit.length > 0) {
-          var offset = prevOffset + edit.length;
-          var text = origText.substring(prevOffset, offset);
-          var splitText = text.split('\n');
-          output.addDeletedText(splitText.first);
-          for (int i = 1; i < splitText.length; i++) {
-            output.addDeletedNewline();
-            output.addDeletedText(splitText[i]);
-          }
-          prevOffset = offset;
-        }
-        if (edit.replacement.isNotEmpty) {
-          var splitText = edit.replacement.split('\n');
-          output.addInsertedText(splitText.first);
-          for (int i = 1; i < splitText.length; i++) {
-            output.addInsertedNewline();
-            output.addInsertedText(splitText[i]);
-          }
-        }
-      }
-    }
-    var text = origText.substring(prevOffset);
-    var splitText = text.split('\n');
-    output.addUnchangedText(splitText.first);
-    output.skipUnchangedNewlines(splitText.length - 1);
-    if (splitText.length > 1) {
-      output.addUnchangedText(splitText.last);
-    }
-    return output.finish();
-  }
-
-  String inserted(String text);
-
-  String lineHeader(int? lineNum, String separator) {
-    const String emptyLineHeader = '         ';
-    if (lineNum == null) {
-      return emptyLineHeader + separator;
-    } else {
-      var text = 'line $lineNum';
-      if (text.length < emptyLineHeader.length) {
-        text = text + ' ' * (emptyLineHeader.length - text.length);
-      }
-      return text + separator;
-    }
-  }
-
-  String unchanged(String text);
-
-  SourceEditDiffOutput _createOutput();
-}
-
-/// Implementation of [DiffStyle] used in production.
-class _DiffStyleForProduction extends DiffStyleImpl {
-  final Ansi _ansi;
-
-  _DiffStyleForProduction(this._ansi) : super._();
-
-  @override
-  String get bullet => '•';
-
-  @override
-  String deleted(String text) =>
-      '${_ansi.red}${_ansi.reversed}$text${_ansi.none}';
-
-  @override
-  String inserted(String text) =>
-      '${_ansi.green}${_ansi.reversed}$text${_ansi.none}';
-
-  @override
-  String unchanged(String text) => text;
-
-  @override
-  SourceEditDiffOutput _createOutput() =>
-      _ansi.useAnsi ? CompactOutput(this) : TraditionalOutput(this);
-}
-
-/// Implementation of [DiffStyle] used in unit tests.  Instead of using ANSI
-/// escape sequences and unicode characters, we use characters easy to type into
-/// unit tests.
-class _DiffStyleForTesting extends DiffStyleImpl {
-  final bool _compact;
-
-  _DiffStyleForTesting(this._compact) : super._();
-
-  @override
-  String get bullet => '*';
-
-  @override
-  String deleted(String text) => '{-$text-}';
-
-  @override
-  String inserted(String text) => '{+$text+}';
-
-  @override
-  String unchanged(String text) => text;
-
-  @override
-  SourceEditDiffOutput _createOutput() =>
-      _compact ? CompactOutput(this) : TraditionalOutput(this);
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/source_edit_diff_output.dart b/pkg/nnbd_migration/lib/src/utilities/source_edit_diff_output.dart
deleted file mode 100644
index f9f19b61fb59..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/source_edit_diff_output.dart
+++ /dev/null
@@ -1,206 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/utilities/source_edit_diff_formatter.dart';
-
-/// Implementation of [SourceEditDiffOutput] for generating compact intra-line diffs.
-class CompactOutput extends SourceEditDiffOutput {
-  final DiffStyleImpl style;
-
-  /// Output generated so far.
-  final List _lines = [];
-
-  /// Accumulator for the current output line.
-  final _currentLine = StringBuffer();
-
-  /// True if the string in [_currentLine] indicates changes.
-  bool _pendingChanges = false;
-
-  /// The current line number, with reference to the original source text.
-  int _lineNum = 1;
-
-  CompactOutput(this.style) {
-    _writeLineHeader(true);
-  }
-
-  void addDeletedNewline() {
-    _flushLine();
-    _lineNum++;
-    _writeLineHeader(true);
-  }
-
-  void addDeletedText(String text) {
-    if (text.isNotEmpty) {
-      _currentLine.write(style.deleted(text));
-      _pendingChanges = true;
-    }
-  }
-
-  void addInsertedNewline() {
-    _flushLine();
-    _writeLineHeader(false);
-  }
-
-  void addInsertedText(String text) {
-    if (text.isNotEmpty) {
-      _currentLine.write(style.inserted(text));
-      _pendingChanges = true;
-    }
-  }
-
-  void addUnchangedText(String text) {
-    if (text.isNotEmpty) {
-      _currentLine.write(style.unchanged(text));
-    }
-  }
-
-  @override
-  List finish() {
-    assert(!_pendingChanges);
-    return _lines;
-  }
-
-  void skipUnchangedNewlines(int count) {
-    _flushLine(suppressOutput: !_pendingChanges);
-    _lineNum += count;
-    _writeLineHeader(true);
-  }
-
-  void _flushLine({bool suppressOutput = false}) {
-    if (!suppressOutput) {
-      _lines.add(_currentLine.toString());
-    }
-    _currentLine.clear();
-    _pendingChanges = false;
-  }
-
-  void _writeLineHeader(bool includeLineNum) {
-    _currentLine.write(
-        style.lineHeader(includeLineNum ? _lineNum : null, '${style.bullet} '));
-  }
-}
-
-/// Abstract base class capable of generating diff output.
-///
-/// Clients shouldn't interact with this class directly; they should use
-/// [DiffStyle.formatDiff] instead.
-abstract class SourceEditDiffOutput {
-  void addDeletedNewline();
-
-  void addDeletedText(String text);
-
-  void addInsertedNewline();
-
-  void addInsertedText(String text);
-
-  void addUnchangedText(String text);
-
-  List finish();
-
-  void skipUnchangedNewlines(int count);
-}
-
-/// Implementation of [SourceEditDiffOutput] for generating traditional diffs that show
-/// before and after lines.
-class TraditionalOutput extends SourceEditDiffOutput {
-  final DiffStyleImpl style;
-
-  /// Output generated so far.
-  final List _lines = [];
-
-  /// Accumulator for the "after" lines in the current diff hunk.
-  final List _afterLines = [];
-
-  /// Accumulator for the current "before" line.
-  final _currentBeforeLine = StringBuffer();
-
-  /// Accumulator for the current "after" line.
-  final _currentAfterLine = StringBuffer();
-
-  /// True if a hunk is currently in progress that represents changes.
-  bool _pendingChanges = false;
-
-  /// The current line number, with reference to the original source text.
-  int _lineNum = 1;
-
-  TraditionalOutput(this.style);
-
-  void addDeletedNewline() {
-    _flushBeforeLine();
-    _lineNum++;
-    if (_currentAfterLine.isEmpty) {
-      // After text is at a line break, so we can output pending changes
-      _outputPendingChanges();
-    }
-  }
-
-  void addDeletedText(String text) {
-    if (text.isNotEmpty) {
-      _currentBeforeLine.write(style.deleted(text));
-      _pendingChanges = true;
-    }
-  }
-
-  void addInsertedNewline() {
-    if (_currentBeforeLine.isEmpty) {
-      // Before text is at a line break, so we are adding a whole line
-      _flushAfterLine(includeLineNum: true);
-      _outputPendingChanges();
-    } else {
-      _flushAfterLine();
-    }
-  }
-
-  void addInsertedText(String text) {
-    if (text.isNotEmpty) {
-      _currentAfterLine.write(style.inserted(text));
-      _pendingChanges = true;
-    }
-  }
-
-  void addUnchangedText(String text) {
-    if (text.isNotEmpty) {
-      var styledText = style.unchanged(text);
-      _currentBeforeLine.write(styledText);
-      _currentAfterLine.write(styledText);
-    }
-  }
-
-  @override
-  List finish() {
-    assert(!_pendingChanges);
-    assert(_afterLines.isEmpty);
-    return _lines;
-  }
-
-  void skipUnchangedNewlines(int count) {
-    _flushBeforeLine(suppressOutput: !_pendingChanges);
-    _flushAfterLine(suppressOutput: !_pendingChanges);
-    _outputPendingChanges();
-    _lineNum += count;
-  }
-
-  void _flushAfterLine(
-      {bool suppressOutput = false, bool includeLineNum = false}) {
-    if (!suppressOutput) {
-      _afterLines.add(style.lineHeader(includeLineNum ? _lineNum : null, '+') +
-          _currentAfterLine.toString());
-    }
-    _currentAfterLine.clear();
-  }
-
-  void _flushBeforeLine({bool suppressOutput = false}) {
-    if (!suppressOutput) {
-      _lines
-          .add(style.lineHeader(_lineNum, '-') + _currentBeforeLine.toString());
-    }
-    _currentBeforeLine.clear();
-  }
-
-  void _outputPendingChanges() {
-    _lines.addAll(_afterLines);
-    _afterLines.clear();
-    _pendingChanges = false;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/where_not_null_transformer.dart b/pkg/nnbd_migration/lib/src/utilities/where_not_null_transformer.dart
deleted file mode 100644
index cc270312619c..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/where_not_null_transformer.dart
+++ /dev/null
@@ -1,152 +0,0 @@
-// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/token.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/dart/element/type_system.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-
-/// Information about a method call that we might want to transform into a call
-/// to `whereNotNull` counterpart.  See [WhereNotNullTransformer] for more
-/// information.
-class WhereNotNullTransformationInfo {
-  /// AST node of the method invocation.
-  final MethodInvocation methodInvocation;
-
-  /// AST node of the argument of the method invocation.
-  final Expression argument;
-
-  /// Original name of the method being called, prior to transformation.
-  final String originalName;
-
-  WhereNotNullTransformationInfo(
-      this.methodInvocation, this.argument, this.originalName);
-
-  /// New method to call, after transformation.
-  String get replacementName => 'whereNotNull';
-}
-
-/// Methods to assist in transforming calls to the `Iterable` method `where`
-/// into calls to the `package:collection` method `whereNotNull`, where
-/// possible.
-///
-/// An example of the kind of code that can be transformed is:
-///
-///     Iterable f(List x) => x.where((y) => y != null);
-///
-/// We transform this into:
-///
-///     Iterable f(List x) => x.whereNotNull();
-///
-/// Without this transformation, the migrated result would have been:
-///
-///     Iterable f(List x) => x.where((y) => y != null);
-///
-/// Which would have placed an otherwise unnecessary requirement on callers to
-/// handle `null` values in the resulting iterable.
-class WhereNotNullTransformer {
-  final TypeProvider _typeProvider;
-
-  final TypeSystem _typeSystem;
-
-  WhereNotNullTransformer(this._typeProvider, this._typeSystem);
-
-  /// Transforms the [DecoratedType] of an invocation of `.where` to the
-  /// [DecoratedType] of the corresponding invocation of `.whereNotNull` that
-  /// will replace it.
-  ///
-  /// The transformation is that the type argument to `Iterable` is made
-  /// non-nullable, so that nullability doesn't unnecessarily propagate to other
-  /// parts of the code.
-  DecoratedType transformDecoratedInvocationType(
-      DecoratedType decoratedType, NullabilityGraph graph) {
-    var type = decoratedType.type;
-    var typeArguments = decoratedType.typeArguments;
-    if (type is InterfaceType &&
-        type.element == _typeProvider.iterableElement &&
-        typeArguments.length == 1) {
-      return DecoratedType(type, decoratedType.node,
-          typeArguments: [typeArguments.single?.withNode(graph.never)]);
-    }
-    return decoratedType;
-  }
-
-  /// Transforms the post-migration type of an invocation of `.where` to the
-  /// type of the corresponding invocation of `.whereNotNull` that will replace
-  /// it.
-  ///
-  /// The transformation is that the type argument to `Iterable` is made
-  /// non-nullable, so that we don't try to introduce any unnecessary null
-  /// checks or type casts in other parts of the code.
-  DartType transformPostMigrationInvocationType(DartType type) {
-    if (type is InterfaceType &&
-        type.element == _typeProvider.iterableElement) {
-      var typeArguments = type.typeArguments;
-      if (typeArguments.length == 1) {
-        return InterfaceTypeImpl(
-            element: type.element,
-            typeArguments: [_typeSystem.promoteToNonNull(typeArguments.single)],
-            nullabilitySuffix: type.nullabilitySuffix);
-      }
-    }
-    return type;
-  }
-
-  /// If [node] is a call that can be transformed, returns information about the
-  /// transformable call; otherwise returns `null`.
-  WhereNotNullTransformationInfo? tryTransformMethodInvocation(AstNode? node) {
-    if (node is MethodInvocation) {
-      if (!_isTransformableMethod(node.methodName.staticElement)) return null;
-      var arguments = node.argumentList.arguments;
-      if (arguments.length != 1) return null;
-      var argument = arguments[0];
-      if (!_isClosureCheckingNotNull(argument)) return null;
-      return WhereNotNullTransformationInfo(
-          node, argument, node.methodName.name);
-    }
-    return null;
-  }
-
-  /// Checks whether [expression] is of the form `(x) => x != null`.
-  bool _isClosureCheckingNotNull(Expression expression) {
-    if (expression is! FunctionExpression) return false;
-    if (expression.typeParameters != null) return false;
-    var parameters = expression.parameters!.parameters;
-    if (parameters.length != 1) return false;
-    var parameter = parameters[0];
-    if (parameter.isNamed) return false;
-    var body = expression.body;
-    if (body is! ExpressionFunctionBody) return false;
-    var returnedExpression = body.expression;
-    if (returnedExpression is! BinaryExpression) return false;
-    if (returnedExpression.operator.type != TokenType.BANG_EQ) return false;
-    var lhs = returnedExpression.leftOperand;
-    if (lhs is! SimpleIdentifier) return false;
-    if (lhs.staticElement != parameter.declaredElement) return false;
-    if (returnedExpression.rightOperand is! NullLiteral) return false;
-    return true;
-  }
-
-  /// Determines if [element] is a declaration of `.where` for which calls can
-  /// be transformed.
-  bool _isTransformableMethod(Element? element) {
-    if (element is MethodElement) {
-      if (element.isStatic) return false;
-      if (element.name != 'where') return false;
-      var enclosingElement = element.declaration.enclosingElement;
-      if (enclosingElement is ClassElement) {
-        // If the class is `Iterable` or a subtype of it, we consider the user
-        // to be calling a transformable method.
-        return _typeSystem.isSubtypeOf(
-            enclosingElement.thisType, _typeProvider.iterableDynamicType);
-      }
-    }
-    return false;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/utilities/where_or_null_transformer.dart b/pkg/nnbd_migration/lib/src/utilities/where_or_null_transformer.dart
deleted file mode 100644
index d276ad5bf563..000000000000
--- a/pkg/nnbd_migration/lib/src/utilities/where_or_null_transformer.dart
+++ /dev/null
@@ -1,148 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/dart/element/type_system.dart';
-
-/// Information about a method call that we might want to transform into its
-/// "OrNull" counterpart.  See [WhereOrNullTransformer] for more information.
-class WhereOrNullTransformationInfo {
-  /// AST node of the method invocation.
-  final MethodInvocation methodInvocation;
-
-  /// AST node of the "orElse" argument of the method invocation.
-  final NamedExpression orElseArgument;
-
-  /// Original name of the method being called, prior to transformation.
-  final String originalName;
-
-  /// New method to call, after transformation.
-  final String replacementName;
-
-  WhereOrNullTransformationInfo(this.methodInvocation, this.orElseArgument,
-      this.originalName, this.replacementName);
-}
-
-/// Methods to assist in transforming calls to the `Iterable` methods
-/// `firstWhere`, `lastWhere`, and `singleWhere` into calls to the
-/// `package:collection` methods `firstWhereOrNull`, `lastWhereOrNull`, or
-/// `singleWhereOrNull`, where possible.
-///
-/// An example of the kind of code that can be transformed is:
-///
-///     int firstEven(Iterable x)
-///         => x.firstWhere((x) => x.isEven, orElse: () => null);
-///
-/// We transform this into:
-///
-///     int firstEven(Iterable x)
-///         => x.firstWhereOrNull((x) => x.isEven);
-///
-/// Without this transformation, the migrated result would have been:
-///
-///     int firstEven(Iterable x)
-///         => x.firstWhere((x) => x.isEven, orElse: () => null);
-///
-/// Which would have placed an otherwise unnecessary nullability requirement on
-/// the type argument of the type of `x`.
-class WhereOrNullTransformer {
-  static const _replacementNames = {
-    'firstWhere': 'firstWhereOrNull',
-    'lastWhere': 'lastWhereOrNull',
-    'singleWhere': 'singleWhereOrNull'
-  };
-
-  final TypeProvider _typeProvider;
-
-  final TypeSystem _typeSystem;
-
-  WhereOrNullTransformer(this._typeProvider, this._typeSystem);
-
-  /// If [expression] is the expression part of the `orElse` argument of a call
-  /// that can be transformed, returns information about the transformable call;
-  /// otherwise returns `null`.
-  WhereOrNullTransformationInfo? tryTransformOrElseArgument(
-      Expression? expression) {
-    var transformationInfo =
-        _tryTransformMethodInvocation(expression?.parent?.parent?.parent);
-    if (transformationInfo != null &&
-        identical(transformationInfo.orElseArgument.expression, expression)) {
-      return transformationInfo;
-    } else {
-      return null;
-    }
-  }
-
-  /// Searches [argumentList] for a named argument with the name "orElse".  If
-  /// such an argument is found, and no other named arguments are found, it is
-  /// returned; otherwise `null` is returned.
-  NamedExpression? _findOrElseArgument(ArgumentList argumentList) {
-    NamedExpression? orElseArgument;
-    for (var argument in argumentList.arguments) {
-      if (argument is NamedExpression) {
-        if (argument.name.label.name == 'orElse') {
-          orElseArgument = argument;
-        } else {
-          // The presence of an unexpected named argument means the user is
-          // calling their own override of the method, and presumably they are
-          // using this named argument to trigger a special behavior of their
-          // override.  So don't try to replace it.
-          return null;
-        }
-      }
-    }
-    return orElseArgument;
-  }
-
-  /// Determines if [element] is a method that can be transformed; if it can,
-  /// the name of the replacement is returned; otherwise, `null` is returned.
-  String? _getTransformableMethodReplacementName(Element? element) {
-    if (element is MethodElement) {
-      if (element.isStatic) return null;
-      var replacementName = _replacementNames[element.name];
-      if (replacementName == null) return null;
-      var enclosingElement = element.declaration.enclosingElement;
-      if (enclosingElement is ClassElement) {
-        // If the class is `Iterable` or a subtype of it, we consider the user
-        // to be calling a transformable method.
-        if (_typeSystem.isSubtypeOf(
-            enclosingElement.thisType, _typeProvider.iterableDynamicType)) {
-          return replacementName;
-        }
-      }
-    }
-    return null;
-  }
-
-  /// Checks whether [expression] is of the form `() => null`.
-  bool _isClosureReturningNull(Expression expression) {
-    if (expression is FunctionExpression) {
-      if (expression.typeParameters != null) return false;
-      if (expression.parameters!.parameters.isNotEmpty) return false;
-      var body = expression.body;
-      if (body is ExpressionFunctionBody) {
-        if (body.expression is NullLiteral) return true;
-      }
-    }
-    return false;
-  }
-
-  /// If [node] is a call that can be transformed, returns information about the
-  /// transformable call; otherwise returns `null`.
-  WhereOrNullTransformationInfo? _tryTransformMethodInvocation(AstNode? node) {
-    if (node is MethodInvocation) {
-      var replacementName =
-          _getTransformableMethodReplacementName(node.methodName.staticElement);
-      if (replacementName == null) return null;
-      var orElseArgument = _findOrElseArgument(node.argumentList);
-      if (orElseArgument == null) return null;
-      if (!_isClosureReturningNull(orElseArgument.expression)) return null;
-      return WhereOrNullTransformationInfo(
-          node, orElseArgument, node.methodName.name, replacementName);
-    }
-    return null;
-  }
-}
diff --git a/pkg/nnbd_migration/lib/src/variables.dart b/pkg/nnbd_migration/lib/src/variables.dart
deleted file mode 100644
index cd0ac04e2f91..000000000000
--- a/pkg/nnbd_migration/lib/src/variables.dart
+++ /dev/null
@@ -1,553 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:math' as math;
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/nullability_suffix.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/dart/element/member.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:analyzer/src/generated/element_type_provider.dart';
-import 'package:analyzer/src/generated/utilities_dart.dart';
-import 'package:meta/meta.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/src/already_migrated_code_decorator.dart';
-import 'package:nnbd_migration/src/conditional_discard.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/expression_checks.dart';
-import 'package:nnbd_migration/src/fix_builder.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:nnbd_migration/src/nullability_node_target.dart';
-import 'package:nnbd_migration/src/utilities/hint_utils.dart';
-
-/// Data structure used by [Variables.spanForUniqueIdentifier] to return an
-/// offset/end pair.
-class OffsetEndPair {
-  final int offset;
-
-  final int end;
-
-  OffsetEndPair(this.offset, this.end);
-
-  @override
-  String toString() => '$offset-$end';
-}
-
-class Variables {
-  final NullabilityGraph _graph;
-
-  final TypeProvider _typeProvider;
-
-  final _conditionalDiscards = >{};
-
-  final _decoratedElementTypes = {};
-
-  final _decoratedDirectSupertypes =
-      >{};
-
-  final _decoratedTypeAnnotations = >{};
-
-  final _expressionChecks = >{};
-
-  final _lateHints = >{};
-
-  final _nullCheckHints = >{};
-
-  final _nullabilityHints = >{};
-
-  final _requiredHints = >{};
-
-  final _unnecessaryCasts = >{};
-
-  final AlreadyMigratedCodeDecorator _alreadyMigratedCodeDecorator;
-
-  final NullabilityMigrationInstrumentation? instrumentation;
-
-  Variables(this._graph, this._typeProvider, {this.instrumentation})
-      : _alreadyMigratedCodeDecorator =
-            AlreadyMigratedCodeDecorator(_graph, _typeProvider);
-
-  /// Given a [class_], gets the decorated type information for the superclasses
-  /// it directly implements/extends/etc.
-  Map decoratedDirectSupertypes(
-      InterfaceElement class_) {
-    return _decoratedDirectSupertypes[class_] ??=
-        _decorateDirectSupertypes(class_);
-  }
-
-  /// Retrieves the [DecoratedType] associated with the static type of the given
-  /// [element].
-  ///
-  /// If no decorated type is found for the given element, and the element is in
-  /// a library that's not being migrated, a decorated type is synthesized using
-  /// [DecoratedType.forElement].
-  DecoratedType decoratedElementType(Element element) {
-    assert(element is! TypeParameterElement,
-        'Use decoratedTypeParameterBound instead');
-    return _decoratedElementTypes[element] ??=
-        _createDecoratedElementType(element);
-  }
-
-  /// Gets the [DecoratedType] associated with the given [typeAnnotation].
-  DecoratedType decoratedTypeAnnotation(
-      Source? source, TypeAnnotation typeAnnotation) {
-    var annotationsInSource = _decoratedTypeAnnotations[source];
-    if (annotationsInSource == null) {
-      throw StateError('No declared type annotations in ${source!.fullName}; '
-          'expected one for ${typeAnnotation.toSource()} '
-          '(offset ${typeAnnotation.offset})');
-    }
-    DecoratedType? decoratedTypeAnnotation = annotationsInSource[
-        uniqueIdentifierForSpan(typeAnnotation.offset, typeAnnotation.end)];
-    if (decoratedTypeAnnotation == null) {
-      throw StateError('Missing declared type annotation'
-          ' in ${source!.fullName}; for ${typeAnnotation.toSource()}');
-    }
-    return decoratedTypeAnnotation;
-  }
-
-  /// Retrieves the decorated bound of the given [typeParameter].
-  ///
-  /// Note: the optional argument [allowNullUnparentedBounds] is intended for
-  /// the FixBuilder stage only, to allow it to cope with the situation where
-  /// a type parameter element with a null parent doesn't have a decorated type
-  /// associated with it.  This can arise because synthetic type parameter
-  /// elements get created as a result of type system operations during
-  /// resolution, and fortunately it isn't a problem during the FixBuilder stage
-  /// because at that point the types we are dealing with are all
-  /// post-migration types, so their bounds already reflect the correct
-  /// nullabilities.
-  DecoratedType? decoratedTypeParameterBound(TypeParameterElement typeParameter,
-      {bool allowNullUnparentedBounds = false}) {
-    var enclosingElement = typeParameter.enclosingElement;
-    var decoratedType =
-        DecoratedTypeParameterBounds.current!.get(typeParameter);
-    if (enclosingElement == null) {
-      if (decoratedType == null && !allowNullUnparentedBounds) {
-        throw StateError(
-            'A decorated type for the bound of $typeParameter should '
-            'have been stored by the NodeBuilder via recordTypeParameterBound');
-      }
-    } else {
-      if (decoratedType == null) {
-        if (_graph.isBeingMigrated(typeParameter.library!.source)) {
-          throw StateError(
-              'A decorated type for the bound of $typeParameter should '
-              'have been stored by the NodeBuilder via '
-              'recordTypeParameterBound');
-        }
-        var target = NullabilityNodeTarget.typeParameterBound(typeParameter);
-        decoratedType = _alreadyMigratedCodeDecorator.decorate(
-            typeParameter.preMigrationBound ?? DynamicTypeImpl.instance,
-            typeParameter,
-            target);
-        instrumentation?.externalDecoratedTypeParameterBound(
-            typeParameter, decoratedType);
-        DecoratedTypeParameterBounds.current!.put(typeParameter, decoratedType);
-      }
-    }
-    return decoratedType;
-  }
-
-  /// Retrieves the [ExpressionChecks] object corresponding to the given
-  /// [expression], if one exists; otherwise null.
-  ExpressionChecks? expressionChecks(Source? source, Expression expression) {
-    return (_expressionChecks[source] ??
-        {})[uniqueIdentifierForSpan(expression.offset, expression.end)];
-  }
-
-  ConditionalDiscard? getConditionalDiscard(Source? source, AstNode node) =>
-      (_conditionalDiscards[source] ?? {})[node.offset];
-
-  /// If the given [node] is preceded by a `/*late*/` hint, returns the
-  /// HintComment for it; otherwise returns `null`.  See [recordLateHint].
-  HintComment? getLateHint(Source? source, VariableDeclarationList node) {
-    return (_lateHints[source] ?? {})[node.offset];
-  }
-
-  /// If the given [node] is followed by a `/*?*/` or /*!*/ hint, returns the
-  /// HintComment for it; otherwise returns `null`.  See
-  /// [recordNullabilityHint].
-  HintComment? getNullabilityHint(Source? source, AstNode node) {
-    assert(node is TypeAnnotation ||
-        node is FunctionTypedFormalParameter ||
-        (node is FieldFormalParameter && node.parameters != null));
-    return (_nullabilityHints[source] ??
-        {})[uniqueIdentifierForSpan(node.offset, node.end)];
-  }
-
-  /// If the given [expression] is followed by a null check hint (`/*!*/`),
-  /// returns the HintComment for it; otherwise returns `null`.  See
-  /// [recordNullCheckHint].
-  HintComment? getNullCheckHint(Source? source, Expression expression) {
-    return (_nullCheckHints[source] ??
-        {})[uniqueIdentifierForSpan(expression.offset, expression.end)];
-  }
-
-  /// If the given [node] is preceded by a `/*required*/` hint, returns the
-  /// HintComment for it; otherwise returns `null`.  See [recordRequiredHint].
-  HintComment? getRequiredHint(Source? source, FormalParameter node) {
-    return (_requiredHints[source] ?? {})[node.offset];
-  }
-
-  /// Records conditional discard information for the given AST node (which is
-  /// an `if` statement or a conditional (`?:`) expression).
-  void recordConditionalDiscard(
-      Source? source, AstNode node, ConditionalDiscard conditionalDiscard) {
-    (_conditionalDiscards[source] ??= {})[node.offset] = conditionalDiscard;
-  }
-
-  /// Associates a [interface] with decorated type information for the superclasses
-  /// it directly implements/extends/etc.
-  void recordDecoratedDirectSupertypes(InterfaceElement interface,
-      Map decoratedDirectSupertypes) {
-    _decoratedDirectSupertypes[interface] = decoratedDirectSupertypes;
-  }
-
-  /// Associates decorated type information with the given [element].
-  void recordDecoratedElementType(Element? element, DecoratedType? type,
-      {bool soft = false}) {
-    assert(() {
-      assert(element is! TypeParameterElement,
-          'Use recordDecoratedTypeParameterBound instead');
-      var library = element!.library;
-      if (library == null) {
-        // No problem; the element is probably a parameter of a function type
-        // expressed using new-style Function syntax.
-      } else {
-        assert(_graph.isBeingMigrated(library.source));
-      }
-      return true;
-    }());
-    if (soft && _decoratedElementTypes.containsKey(element)) {
-      return;
-    }
-    _decoratedElementTypes[element] = type;
-  }
-
-  /// Associates decorated type information with the given expression [node].
-  void recordDecoratedExpressionType(Expression node, DecoratedType? type) {}
-
-  /// Associates decorated type information with the given [type] node.
-  void recordDecoratedTypeAnnotation(
-      Source? source, TypeAnnotation node, DecoratedType type) {
-    instrumentation?.explicitTypeNullability(source, node, type.node);
-    var id = uniqueIdentifierForSpan(node.offset, node.end);
-    (_decoratedTypeAnnotations[source] ??= {})[id] = type;
-  }
-
-  /// Associates a set of nullability checks with the given expression [node].
-  void recordExpressionChecks(
-      Source? source, Expression expression, ExpressionChecksOrigin origin) {
-    (_expressionChecks[source] ??=
-            {})[uniqueIdentifierForSpan(expression.offset, expression.end)] =
-        origin.checks;
-  }
-
-  /// Records that the given [node] was preceded by a `/*late*/` hint.
-  void recordLateHint(
-      Source? source, VariableDeclarationList node, HintComment hint) {
-    (_lateHints[source] ??= {})[node.offset] = hint;
-  }
-
-  /// Records that the given [node] was followed by a `/*?*/` or `/*!*/` hint.
-  void recordNullabilityHint(
-      Source? source, AstNode node, HintComment hintComment) {
-    assert(node is TypeAnnotation ||
-        node is FunctionTypedFormalParameter ||
-        (node is FieldFormalParameter && node.parameters != null));
-    (_nullabilityHints[source] ??=
-        {})[uniqueIdentifierForSpan(node.offset, node.end)] = hintComment;
-  }
-
-  /// Records that the given [expression] is followed by a null check hint
-  /// (`/*!*/`), for later recall by [hasNullCheckHint].
-  void recordNullCheckHint(
-      Source? source, Expression expression, HintComment hintComment) {
-    (_nullCheckHints[source] ??=
-            {})[uniqueIdentifierForSpan(expression.offset, expression.end)] =
-        hintComment;
-  }
-
-  /// Records that the given [node] was preceded by a `/*required*/` hint.
-  void recordRequiredHint(
-      Source? source, FormalParameter node, HintComment hint) {
-    (_requiredHints[source] ??= {})[node.offset] = hint;
-  }
-
-  /// Records the fact that prior to migration, an unnecessary cast existed at
-  /// [node].
-  void recordUnnecessaryCast(Source? source, AsExpression node) {
-    bool newlyAdded = (_unnecessaryCasts[source] ??= {})
-        .add(uniqueIdentifierForSpan(node.offset, node.end));
-    assert(newlyAdded);
-  }
-
-  /// Convert this decorated type into the [DartType] that it will represent
-  /// after the code has been migrated.
-  ///
-  /// This method should be used after nullability propagation; it makes use of
-  /// the nullabilities associated with nullability nodes to determine which
-  /// types should be nullable and which types should not.
-  DartType toFinalType(DecoratedType decoratedType) {
-    var type = decoratedType.type!;
-    if (type is VoidType || type is DynamicType) return type;
-    if (type is NeverType) {
-      if (decoratedType.node.isNullable) {
-        return (_typeProvider.nullType as TypeImpl)
-            .withNullability(NullabilitySuffix.none);
-      } else {
-        return NeverTypeImpl.instance;
-      }
-    } else if (type.isDartCoreNull) {
-      return (_typeProvider.nullType as TypeImpl)
-          .withNullability(NullabilitySuffix.none);
-    }
-    var nullabilitySuffix = decoratedType.node.isNullable
-        ? NullabilitySuffix.question
-        : NullabilitySuffix.none;
-    if (type is FunctionType) {
-      var parameters = [];
-      for (int i = 0; i < type.parameters.length; i++) {
-        var origParameter = type.parameters[i];
-        ParameterKind parameterKind;
-        DecoratedType? parameterType;
-        var name = origParameter.name;
-        if (origParameter.isNamed) {
-          // TODO(paulberry): infer ParameterKind.NAMED_REQUIRED when
-          // appropriate. See https://github.com/dart-lang/sdk/issues/38596.
-          parameterKind = ParameterKind.NAMED;
-          parameterType = decoratedType.namedParameters![name];
-        } else {
-          parameterKind = origParameter.isOptional
-              ? ParameterKind.POSITIONAL
-              : ParameterKind.REQUIRED;
-          parameterType = decoratedType.positionalParameters![i];
-        }
-        parameters.add(ParameterElementImpl.synthetic(
-            name, toFinalType(parameterType!), parameterKind));
-      }
-      return FunctionTypeImpl(
-        typeFormals: type.typeFormals,
-        parameters: parameters,
-        returnType: toFinalType(decoratedType.returnType!),
-        nullabilitySuffix: nullabilitySuffix,
-      );
-    } else if (type is InterfaceType) {
-      return InterfaceTypeImpl(
-        element: type.element,
-        typeArguments: [
-          for (var arg in decoratedType.typeArguments) toFinalType(arg!)
-        ],
-        nullabilitySuffix: nullabilitySuffix,
-      );
-    } else if (type is TypeParameterType) {
-      return TypeParameterTypeImpl(
-        element: type.element,
-        nullabilitySuffix: nullabilitySuffix,
-      );
-    } else {
-      // The above cases should cover all possible types.  On the off chance
-      // they don't, fall back on returning DecoratedType.type.
-      assert(false, 'Unexpected type (${type.runtimeType})');
-      return type;
-    }
-  }
-
-  /// Queries whether, prior to migration, an unnecessary cast existed at
-  /// [node].
-  bool wasUnnecessaryCast(Source? source, AsExpression node) =>
-      (_unnecessaryCasts[source] ?? const {})
-          .contains(uniqueIdentifierForSpan(node.offset, node.end));
-
-  /// Creates a decorated type for the given [element], which should come from
-  /// an already-migrated library (or the SDK).
-  DecoratedType _createDecoratedElementType(Element element) {
-    if (_graph.isBeingMigrated(element.library!.source) &&
-        !_isLoadLibraryElement(element)) {
-      Object? description;
-      if (ElementTypeProvider.current is MigrationResolutionHooksImpl) {
-        // Don't attempt to call toString() on element, or we will overflow.
-        description = element.location;
-      } else {
-        description = element;
-      }
-      throw StateError(
-          'A decorated type for $description should have been stored '
-          'by the NodeBuilder via recordDecoratedElementType');
-    }
-
-    DecoratedType decoratedType;
-    if (element is Member) {
-      assert(element.isLegacy);
-      element = element.declaration;
-    }
-
-    if (element is TypeAliasElement) {
-      // For `typedef F = Function(T)`, get the `function` which is (in this
-      // case) `Function(T)`. Without this we would get `Function(T)` which
-      // is incorrect. This is a known issue with `.type` on typedefs in the
-      // analyzer.
-      element = element.aliasedElement!;
-    }
-
-    var target = NullabilityNodeTarget.element(element);
-    if (element is FunctionTypedElement) {
-      decoratedType = _alreadyMigratedCodeDecorator.decorate(
-          element.preMigrationType, element, target);
-    } else if (element is VariableElement) {
-      decoratedType = _alreadyMigratedCodeDecorator.decorate(
-          element.preMigrationType, element, target);
-    } else if (element is ExtensionElement) {
-      decoratedType = _alreadyMigratedCodeDecorator.decorate(
-          element.preMigrationExtendedType, element, target);
-    } else {
-      // TODO(paulberry)
-      throw UnimplementedError('Decorating ${element.runtimeType}');
-    }
-    instrumentation?.externalDecoratedType(element, decoratedType);
-    return decoratedType;
-  }
-
-  /// Creates an entry [_decoratedDirectSupertypes] for an already-migrated
-  /// class.
-  Map _decorateDirectSupertypes(
-      InterfaceElement class_) {
-    var result = {};
-    for (var decoratedSupertype
-        in _alreadyMigratedCodeDecorator.getImmediateSupertypes(class_)) {
-      var class_ = (decoratedSupertype.type as InterfaceType).element;
-      result[class_] = decoratedSupertype;
-    }
-    return result;
-  }
-
-  bool _isLoadLibraryElement(Element element) =>
-      element.isSynthetic &&
-      element is FunctionElement &&
-      element.enclosingElement is LibraryElement &&
-      element.name == 'loadLibrary';
-
-  /// Inverts the logic of [uniqueIdentifierForSpan], producing an (offset, end)
-  /// pair.
-  static OffsetEndPair spanForUniqueIdentifier(int span) {
-    // The formula for uniqueIdentifierForSpan was:
-    //   span = end*(end + 1) / 2 + offset
-    // In other words, all encodings with the same `end` value are consecutive.
-    // So we just have to figure out the `end` value for this `span`, then
-    // use [uniqueIdentifierForSpan] to find the first encoding with this `end`
-    // value, and subtract to find the offset.
-    //
-    // To find the `end` value, we assume offset = 0 and solve for `end` using
-    // the quadratic formula:
-    //   span = end*(end + 1) / 2
-    //   end^2 + end - 2*span = 0
-    //   end = -1 +/- sqrt(1 + 8*span)
-    // We can resolve the `+/-` to `+` (since the result we seek can't be
-    // negative), so that yields:
-    //   end = sqrt(1 + 8*span) - 1
-    int end = (math.sqrt(1 + 8.0 * span) - 1).floor();
-    assert(end >= 0);
-
-    // There's a slight chance of numerical instabilities in `sqrt` leading to
-    // a result for `end` that's off by 1, so we loop to find the correct
-    // result:
-    while (true) {
-      // Compute the first `span` value corresponding to this `end` value.
-      int firstSpanForThisEnd = uniqueIdentifierForSpan(0, end);
-
-      // Offsets are encoded consecutively so we can find the offset by
-      // subtracting:
-      int offset = span - firstSpanForThisEnd;
-
-      if (offset < 0) {
-        // Oops, `end` must have been too large.  Decrement and try again.
-        assert(end > 0);
-        --end;
-      } else if (offset > end) {
-        // Oops, `end` must have been too small.  Increment and try again.
-        ++end;
-      } else {
-        return OffsetEndPair(offset, end);
-      }
-    }
-  }
-
-  /// Combine the given [offset] and [end] into a unique integer that depends
-  /// on both of them, taking advantage of the fact that `0 <= offset <= end`.
-  @visibleForTesting
-  static int uniqueIdentifierForSpan(int offset, int end) {
-    assert(0 <= offset && offset <= end);
-    // Our encoding is based on the observation that if you make a graph of the
-    // set of all possible (offset, end) pairs, marking those that satisfy
-    // `0 <= offset <= end` with an `x`, you get a triangle shape:
-    //
-    //       offset
-    //     +-------->
-    //     |x
-    //     |xx
-    // end |xxx
-    //     |xxxx
-    //     V
-    //
-    // If we assign integers to the `x`s in the order they appear in this graph,
-    // then the rows start with numbers 0, 1, 3, 6, 10, etc.  This can be
-    // computed from `end` as `end*(end + 1)/2`.  We use `~/` for integer
-    // division.
-    return end * (end + 1) ~/ 2 + offset;
-  }
-}
-
-extension on TypeParameterElement {
-  DartType? get preMigrationBound {
-    var previousElementTypeProvider = ElementTypeProvider.current;
-    try {
-      ElementTypeProvider.current = const ElementTypeProvider();
-      return bound;
-    } finally {
-      ElementTypeProvider.current = previousElementTypeProvider;
-    }
-  }
-}
-
-extension on FunctionTypedElement {
-  FunctionType get preMigrationType {
-    var previousElementTypeProvider = ElementTypeProvider.current;
-    try {
-      ElementTypeProvider.current = const ElementTypeProvider();
-      return type;
-    } finally {
-      ElementTypeProvider.current = previousElementTypeProvider;
-    }
-  }
-}
-
-extension on VariableElement {
-  DartType get preMigrationType {
-    var previousElementTypeProvider = ElementTypeProvider.current;
-    try {
-      ElementTypeProvider.current = const ElementTypeProvider();
-      return type;
-    } finally {
-      ElementTypeProvider.current = previousElementTypeProvider;
-    }
-  }
-}
-
-extension on ExtensionElement {
-  DartType get preMigrationExtendedType {
-    var previousElementTypeProvider = ElementTypeProvider.current;
-    try {
-      ElementTypeProvider.current = const ElementTypeProvider();
-      return extendedType;
-    } finally {
-      ElementTypeProvider.current = previousElementTypeProvider;
-    }
-  }
-}
diff --git a/pkg/nnbd_migration/pubspec.yaml b/pkg/nnbd_migration/pubspec.yaml
deleted file mode 100644
index 5fe1427da6e9..000000000000
--- a/pkg/nnbd_migration/pubspec.yaml
+++ /dev/null
@@ -1,30 +0,0 @@
-name: nnbd_migration
-
-# This package is not intended for consumption on pub.dev. DO NOT publish.
-publish_to: none
-
-environment:
-  sdk: ^3.0.0
-
-# Use 'any' constraints here; we get our versions from the DEPS file.
-dependencies:
-  _fe_analyzer_shared: any
-  analyzer_plugin: any
-  analyzer: any
-  args: any
-  cli_util: any
-  collection: any
-  crypto: any
-  meta: any
-  path: any
-  pub_semver: any
-  source_span: any
-  yaml: any
-
-# Use 'any' constraints here; we get our versions from the DEPS file.
-dev_dependencies:
-  analyzer_utilities: any
-  http: any
-  lints: any
-  test_reflective_loader: any
-  test: any
diff --git a/pkg/nnbd_migration/test/abstract_context.dart b/pkg/nnbd_migration/test/abstract_context.dart
deleted file mode 100644
index 489be641a50c..000000000000
--- a/pkg/nnbd_migration/test/abstract_context.dart
+++ /dev/null
@@ -1,255 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert';
-
-import 'package:analyzer/dart/analysis/analysis_context.dart';
-import 'package:analyzer/dart/analysis/session.dart';
-import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/file_system/overlay_file_system.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer/src/dart/analysis/analysis_context_collection.dart';
-import 'package:analyzer/src/dart/analysis/driver.dart';
-import 'package:analyzer/src/dart/analysis/driver_based_analysis_context.dart';
-import 'package:analyzer/src/generated/engine.dart' show AnalysisEngine;
-import 'package:analyzer/src/test_utilities/mock_sdk.dart';
-import 'package:analyzer/src/test_utilities/resource_provider_mixin.dart';
-
-/// TODO(paulberry): this logic is duplicated from other packages.  Find a way
-/// share it, or avoid relying on it.
-class AbstractContextTest with ResourceProviderMixin {
-  OverlayResourceProvider? overlayResourceProvider;
-
-  AnalysisContextCollectionImpl? _analysisContextCollection;
-  AnalysisDriver? _driver;
-
-  final Set knownPackages = {};
-
-  /// Whether the test should perform analysis with NNBD enabled.
-  ///
-  /// `false` by default.  May be overridden in derived test classes.
-  bool get analyzeWithNnbd => false;
-
-  AnalysisDriver? get driver {
-    if (_driver == null) {
-      _createAnalysisContexts();
-    }
-    return _driver;
-  }
-
-  String get homePath => '/home';
-
-  Folder get sdkRoot => newFolder('/sdk');
-
-  AnalysisSession get session => driver!.currentSession;
-
-  String get testsPath => '$homePath/tests';
-
-  /// Makes a mock version of the Angular package available for unit testing.
-  ///
-  /// If optional argument [internalUris] is `true`, the mock Angular package
-  /// will be located in a package called `third_party.dart_src.angular.angular`
-  /// (as it is in Google3), and `package:angular` will simply re-export it;
-  /// this allows the test to reflect usage in internal sources.
-  void addAngularPackage({bool internalUris = false}) {
-    addPackageFile(
-        internalUris ? 'third_party.dart_src.angular.angular' : 'angular',
-        'angular.dart', '''
-class Component {
-  const Component({
-    required String selector,
-    // optional arguments skipped
-  })
-}
-class Attribute {
-  const Attribute(String attributeName);
-}
-class ContentChild {
-  const ContentChild(Object selector, {Object? read});
-}
-class ContentChildren {
-  const ContentChildren(Object selector, {Object? read});
-}
-class Optional {
-  const Optional();
-}
-class ViewChild {
-  const ViewChild(Object selector, {Object? read});
-}
-class ViewChildren {
-  const ViewChildren(Object selector, {Object? read});
-}
-class Injector {
-  dynamic get(Object token, [Object? notFoundValue]) => null;
-}
-class Injectable {
-  const Injectable();
-}
-''');
-    if (internalUris) {
-      addPackageFile('angular', 'angular.dart', '''
-export 'package:third_party.dart_src.angular.angular/angular.dart';
-''');
-    }
-  }
-
-  void addBuiltValuePackage() {
-    addPackageFile('built_value', 'built_value.dart', '''
-abstract class Built, B extends Builder> {}
-abstract class Builder, B extends Builder> {}
-const String nullable = 'nullable';
-class BuiltValueNullFieldError extends Error {
-  static T checkNotNull(T? value, String type, String field) => value!;
-}
-''');
-  }
-
-  void addMetaPackage() {
-    addPackageFile('meta', 'meta.dart', r'''
-library meta;
-
-const Required required = const Required();
-
-class Required {
-  final String reason;
-  const Required([this.reason]);
-}
-''');
-  }
-
-  /// Add a new file with the given [pathInLib] to the package with the given
-  /// [packageName].  Then ensure that the package under test depends on the
-  /// package.
-  File addPackageFile(String packageName, String pathInLib, String content) {
-    var packagePath = '/.pub-cache/$packageName';
-    knownPackages.add(packageName);
-    return newFile('$packagePath/lib/$pathInLib', content);
-  }
-
-  /// Add the quiver package and a library with URI,
-  /// "package:quiver/check.dart".
-  ///
-  /// Then ensure that the package under test depends on the package.
-  void addQuiverPackage() {
-    addPackageFile('quiver', 'check.dart', r'''
-library quiver.check;
-
-T checkNotNull(T reference, {dynamic message}) => T;
-''');
-  }
-
-  Source addSource(String path, String content, [Uri? uri]) {
-    File file = newFile(path, content);
-    return file.createSource(uri);
-  }
-
-  /// Add the test_core package and a library with URI,
-  /// "package:test_core/test_core.dart".
-  ///
-  /// Then ensure that the package under test depends on the package.
-  void addTestCorePackage() {
-    addPackageFile('test_core', 'test_core.dart', r'''
-library test_core;
-
-void setUp(dynamic callback()) {}
-void group(dynamic description, dynamic body()) {}
-void test(dynamic description, dynamic body()) {}
-''');
-    addPackageFile('test', 'test.dart', r'''
-library test;
-export 'package:test_core/test_core.dart';
-''');
-  }
-
-  /// Return the existing analysis context that should be used to analyze the
-  /// given [path], or throw [StateError] if the [path] is not analyzed in any
-  /// of the created analysis contexts.
-  AnalysisContext getContext(String path) {
-    return _getContext(path);
-  }
-
-  /// Return the existing analysis driver that should be used to analyze the
-  /// given [path], or throw [StateError] if the [path] is not analyzed in any
-  /// of the created analysis contexts.
-  AnalysisDriver getDriver(String path) {
-    return _getContext(path).driver;
-  }
-
-  void setUp() {
-    setupResourceProvider();
-    overlayResourceProvider = OverlayResourceProvider(resourceProvider);
-
-    createMockSdk(
-      resourceProvider: resourceProvider,
-      root: sdkRoot,
-    );
-
-    newFolder(testsPath);
-    newFile('$testsPath/.packages', '''
-tests:file://$testsPath/lib
-''');
-    var pubspecPath = '$testsPath/pubspec.yaml';
-    // Subclasses may write out a different file first.
-    if (!getFile(pubspecPath).exists) {
-      newFile(pubspecPath, '''
-name: tests
-version: 1.0.0
-environment:
-  sdk: '>=2.9.0 <3.0.0'
-''');
-    }
-  }
-
-  void setupResourceProvider() {}
-
-  void tearDown() {
-    AnalysisEngine.instance.clearCaches();
-  }
-
-  /// Create all analysis contexts in [_homePath].
-  void _createAnalysisContexts() {
-    var packageConfigJson = {
-      'configVersion': 2,
-      'packages': [
-        for (var packageName in knownPackages)
-          {
-            'name': packageName,
-            'rootUri': toUriStr('/.pub-cache/$packageName'),
-            'packageUri': 'lib/',
-            'languageVersion': '2.12'
-          },
-        {
-          'name': 'tests',
-          'rootUri': '../',
-          'packageUri': 'lib/',
-          'languageVersion': analyzeWithNnbd ? '2.12' : '2.9'
-        }
-      ],
-      'generated': '2020-10-21T21:13:05.186004Z',
-      'generator': 'pub',
-      'generatorVersion': '2.10.0'
-    };
-    newFile('$testsPath/.dart_tool/package_config.json',
-        JsonEncoder.withIndent('  ').convert(packageConfigJson));
-    _analysisContextCollection = AnalysisContextCollectionImpl(
-      includedPaths: [convertPath(homePath)],
-      enableIndex: true,
-      resourceProvider: overlayResourceProvider,
-      sdkPath: sdkRoot.path,
-    );
-
-    _driver = getDriver(convertPath(testsPath));
-  }
-
-  /// Return the existing analysis context that should be used to analyze the
-  /// given [path], or throw [StateError] if the [path] is not analyzed in any
-  /// of the created analysis contexts.
-  DriverBasedAnalysisContext _getContext(String path) {
-    if (_analysisContextCollection == null) {
-      _createAnalysisContexts();
-    }
-    path = convertPath(path);
-    return _analysisContextCollection!.contextFor(path);
-  }
-}
diff --git a/pkg/nnbd_migration/test/abstract_single_unit.dart b/pkg/nnbd_migration/test/abstract_single_unit.dart
deleted file mode 100644
index 842971e2acbc..000000000000
--- a/pkg/nnbd_migration/test/abstract_single_unit.dart
+++ /dev/null
@@ -1,83 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/analysis/results.dart';
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/error/error.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/test_utilities/find_element.dart';
-import 'package:analyzer/src/test_utilities/find_node.dart';
-import 'package:test/test.dart';
-
-import 'abstract_context.dart';
-
-/// TODO(paulberry): this logic is duplicated from other packages.  Find a way
-/// share it, or avoid relying on it.
-class AbstractSingleUnitTest extends AbstractContextTest {
-  bool verifyNoTestUnitErrors = true;
-
-  String? testCode;
-  late String testFile;
-  Uri? testUri;
-  Source? testSource;
-  late ResolvedUnitResult testAnalysisResult;
-  CompilationUnit? testUnit;
-  CompilationUnitElement? testUnitElement;
-  LibraryElement? testLibraryElement;
-  late FindNode findNode;
-  late FindElement findElement;
-
-  void addTestSource(String code, [Uri? uri]) {
-    testCode = code;
-    testSource = addSource(testFile, code, uri);
-  }
-
-  Future resolveTestUnit(String code) async {
-    addTestSource(code, testUri);
-    testAnalysisResult =
-        await session.getResolvedUnit(testFile) as ResolvedUnitResult;
-    testUnit = testAnalysisResult.unit;
-    if (verifyNoTestUnitErrors) {
-      expect(testAnalysisResult.errors.where((AnalysisError error) {
-        return error.errorCode != WarningCode.DEAD_CODE &&
-            error.errorCode != WarningCode.UNUSED_CATCH_CLAUSE &&
-            error.errorCode != WarningCode.UNUSED_CATCH_STACK &&
-            error.errorCode != WarningCode.UNUSED_ELEMENT &&
-            error.errorCode != WarningCode.UNUSED_ELEMENT_PARAMETER &&
-            error.errorCode != WarningCode.UNUSED_FIELD &&
-            error.errorCode != WarningCode.UNUSED_IMPORT &&
-            error.errorCode != WarningCode.UNUSED_LOCAL_VARIABLE;
-      }), isEmpty);
-    }
-    testUnitElement = testUnit!.declaredElement;
-    testLibraryElement = testUnitElement!.library;
-    findNode = FindNode(code, testUnit!);
-    findElement = FindElement(testUnit!);
-  }
-
-  @override
-  void setUp() {
-    var testRoot = testsPath;
-    if (analyzeWithNnbd) {
-      newFile('$testRoot/analysis_options.yaml', '''
-analyzer:
-  enable-experiment:
-    - non-nullable
-''');
-    }
-    if (analyzeWithNnbd) {
-      newPubspecYamlFile(testRoot, '''
-name: tests
-version: 1.0.0
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-''');
-    }
-    super.setUp();
-    testFile = convertPath('$testRoot/lib/test.dart');
-    testUri = Uri.parse('package:tests/test.dart');
-  }
-}
diff --git a/pkg/nnbd_migration/test/already_migrated_code_decorator_test.dart b/pkg/nnbd_migration/test/already_migrated_code_decorator_test.dart
deleted file mode 100644
index c599e9b597c6..000000000000
--- a/pkg/nnbd_migration/test/already_migrated_code_decorator_test.dart
+++ /dev/null
@@ -1,668 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/analysis/analysis_context_collection.dart';
-import 'package:analyzer/dart/analysis/results.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/nullability_suffix.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:analyzer/src/generated/utilities_dart.dart';
-import 'package:analyzer/src/test_utilities/find_element.dart';
-import 'package:analyzer/src/test_utilities/find_node.dart';
-import 'package:analyzer/src/test_utilities/mock_sdk.dart';
-import 'package:analyzer/src/test_utilities/resource_provider_mixin.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/src/already_migrated_code_decorator.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:nnbd_migration/src/nullability_node_target.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'migration_visitor_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(_AlreadyMigratedCodeDecoratorTestNormal);
-    defineReflectiveTests(_AlreadyMigratedCodeDecoratorTestProvisional);
-  });
-}
-
-class _AlreadyMigratedCodeDecoratorTestBase {
-  final NullabilitySuffix suffix;
-
-  final decoratedTypeParameterBounds = DecoratedTypeParameterBounds();
-
-  _AlreadyMigratedCodeDecoratorTestBase(this.suffix);
-
-  DecoratedType? getDecoratedBound(TypeParameterElement element) =>
-      decoratedTypeParameterBounds.get(element);
-
-  void setUp() {
-    DecoratedTypeParameterBounds.current = decoratedTypeParameterBounds;
-  }
-
-  void tearDown() {
-    DecoratedTypeParameterBounds.current = null;
-  }
-
-  Future test_decorate_dynamic() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-    withElement.checkDynamic(
-        withElement.decorate(withElement.typeProvider.dynamicType),
-        'test type');
-  }
-
-  Future test_decorate_functionType_generic_bounded() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'class A {}',
-    );
-    var typeFormal = withUnit.findElement.typeParameter('T');
-    var withElement = withUnit.withElement(typeFormal);
-
-    var decoratedType = withElement.decorate(
-      FunctionTypeImpl(
-        typeFormals: [typeFormal],
-        parameters: const [],
-        returnType: TypeParameterTypeImpl(
-          element: typeFormal,
-          nullabilitySuffix: NullabilitySuffix.star,
-        ),
-        nullabilitySuffix: suffix,
-      ),
-    );
-    withElement.checkNum(
-        getDecoratedBound(typeFormal)!,
-        withElement.checkExplicitlyNonNullable,
-        'bound of type formal T of test type');
-    withElement.checkTypeParameter(
-        decoratedType.returnType!,
-        withElement.checkExplicitlyNonNullable,
-        typeFormal,
-        'return type of test type');
-  }
-
-  Future test_decorate_functionType_generic_no_explicit_bound() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'class A {}',
-    );
-    var typeFormal = withUnit.findElement.typeParameter('T');
-    var withElement = withUnit.withElement(typeFormal);
-
-    var decoratedType = withElement.decorate(
-      FunctionTypeImpl(
-        typeFormals: [typeFormal],
-        parameters: const [],
-        returnType: TypeParameterTypeImpl(
-          element: typeFormal,
-          nullabilitySuffix: NullabilitySuffix.star,
-        ),
-        nullabilitySuffix: suffix,
-      ),
-    );
-    withElement.checkObject(
-        getDecoratedBound(typeFormal)!,
-        withElement.checkExplicitlyNullable,
-        'bound of type formal T of test type');
-    withElement.checkTypeParameter(
-        decoratedType.returnType!,
-        withElement.checkExplicitlyNonNullable,
-        typeFormal,
-        'return type of test type');
-  }
-
-  Future test_decorate_functionType_named_parameter() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkDynamic(
-        withElement
-            .decorate(
-              FunctionTypeImpl(
-                typeFormals: const [],
-                parameters: [
-                  ParameterElementImpl.synthetic(
-                    'x',
-                    withElement.typeProvider.dynamicType,
-                    ParameterKind.NAMED,
-                  )
-                ],
-                returnType: withElement.typeProvider.voidType,
-                nullabilitySuffix: suffix,
-              ),
-            )
-            .namedParameters!['x'],
-        'parameter x of test type');
-  }
-
-  Future test_decorate_functionType_ordinary_parameters() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    var decoratedType = withElement.decorate(
-      FunctionTypeImpl(
-        typeFormals: const [],
-        parameters: [
-          ParameterElementImpl.synthetic(
-            'x',
-            withElement.typeProvider.dynamicType,
-            ParameterKind.REQUIRED,
-          ),
-          ParameterElementImpl.synthetic(
-            'y',
-            withElement.typeProvider.dynamicType,
-            ParameterKind.REQUIRED,
-          )
-        ],
-        returnType: withElement.typeProvider.voidType,
-        nullabilitySuffix: suffix,
-      ),
-    );
-    withElement.checkDynamic(
-        decoratedType.positionalParameters![0], 'parameter 0 of test type');
-    withElement.checkDynamic(
-        decoratedType.positionalParameters![1], 'parameter 1 of test type');
-  }
-
-  Future test_decorate_functionType_positional_parameter() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkDynamic(
-        withElement
-            .decorate(
-              FunctionTypeImpl(
-                typeFormals: const [],
-                parameters: [
-                  ParameterElementImpl.synthetic(
-                    'x',
-                    withElement.typeProvider.dynamicType,
-                    ParameterKind.POSITIONAL,
-                  )
-                ],
-                returnType: withElement.typeProvider.voidType,
-                nullabilitySuffix: suffix,
-              ),
-            )
-            .positionalParameters![0],
-        'parameter 0 of test type');
-  }
-
-  Future test_decorate_functionType_question() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkExplicitlyNullable(
-        withElement
-            .decorate(
-              FunctionTypeImpl(
-                typeFormals: const [],
-                parameters: const [],
-                returnType: withElement.typeProvider.voidType,
-                nullabilitySuffix: NullabilitySuffix.question,
-              ),
-            )
-            .node,
-        'test type');
-  }
-
-  Future test_decorate_functionType_returnType() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkDynamic(
-        withElement
-            .decorate(
-              FunctionTypeImpl(
-                typeFormals: const [],
-                parameters: const [],
-                returnType: withElement.typeProvider.dynamicType,
-                nullabilitySuffix: suffix,
-              ),
-            )
-            .returnType,
-        'return type of test type');
-  }
-
-  Future test_decorate_functionType_star() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkExplicitlyNonNullable(
-        withElement
-            .decorate(
-              FunctionTypeImpl(
-                typeFormals: const [],
-                parameters: const [],
-                returnType: withElement.typeProvider.voidType,
-                nullabilitySuffix: suffix,
-              ),
-            )
-            .node,
-        'test type');
-  }
-
-  Future test_decorate_interfaceType_parameters() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    var decoratedType = withElement.decorate(InterfaceTypeImpl(
-        element: withElement.typeProvider.mapElement,
-        typeArguments: [
-          withElement.typeProvider.intType,
-          withElement.typeProvider.numType
-        ],
-        nullabilitySuffix: suffix));
-    withElement.checkInt(decoratedType.typeArguments[0]!,
-        withElement.checkExplicitlyNonNullable, 'type argument 0 of test type');
-    withElement.checkNum(decoratedType.typeArguments[1]!,
-        withElement.checkExplicitlyNonNullable, 'type argument 1 of test type');
-  }
-
-  Future test_decorate_interfaceType_simple_question() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkInt(
-        withElement.decorate(
-          InterfaceTypeImpl(
-            element: withElement.typeProvider.intElement,
-            typeArguments: const [],
-            nullabilitySuffix: NullabilitySuffix.question,
-          ),
-        ),
-        withElement.checkExplicitlyNullable,
-        'test type');
-  }
-
-  Future test_decorate_interfaceType_simple_star() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkInt(
-        withElement.decorate(
-          InterfaceTypeImpl(
-            element: withElement.typeProvider.intElement,
-            typeArguments: const [],
-            nullabilitySuffix: suffix,
-          ),
-        ),
-        withElement.checkExplicitlyNonNullable,
-        'test type');
-  }
-
-  Future test_decorate_iterable_dynamic() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    var decorated =
-        withElement.decorate(withElement.typeProvider.iterableDynamicType);
-    withElement.checkIterable(decorated, withElement.checkExplicitlyNonNullable,
-        withElement.checkDynamic, 'test type');
-  }
-
-  Future test_decorate_never() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkNever(
-        withElement.decorate(withElement.typeProvider.neverType), 'test type');
-  }
-
-  Future test_decorate_typeParameterType_question() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'class A {}',
-    );
-    var element = withUnit.findElement.typeParameter('T');
-    var withElement = withUnit.withElement(element);
-
-    withElement.checkTypeParameter(
-        withElement.decorate(TypeParameterTypeImpl(
-            element: element, nullabilitySuffix: NullabilitySuffix.question)),
-        withElement.checkExplicitlyNullable,
-        element,
-        'test type');
-  }
-
-  Future test_decorate_typeParameterType_star() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'class A {}',
-    );
-    var element = withUnit.findElement.typeParameter('T');
-    var withElement = withUnit.withElement(element);
-
-    withElement.checkTypeParameter(
-        withElement.decorate(
-            TypeParameterTypeImpl(element: element, nullabilitySuffix: suffix)),
-        withElement.checkExplicitlyNonNullable,
-        element,
-        'test type');
-  }
-
-  Future test_decorate_void() async {
-    var withElement = await _ContextWithFiles().withEmptyUnit();
-
-    withElement.checkVoid(
-        withElement.decorate(withElement.typeProvider.voidType), 'test type');
-  }
-
-  Future test_getImmediateSupertypes_future() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement('');
-    var element = withUnit.typeProvider.futureElement;
-    var withElement = withUnit.withElement(element);
-
-    // var class_ = element = typeProvider.futureElement;
-    var class_ = withElement.typeProvider.futureElement;
-    var decoratedSupertypes =
-        withElement.decorator.getImmediateSupertypes(class_).toList();
-    var typeParam = class_.typeParameters[0];
-    expect(decoratedSupertypes, hasLength(2));
-    // TODO(scheglov) Use location matcher.
-    withElement.checkObject(decoratedSupertypes[0],
-        withElement.checkExplicitlyNonNullable, 'Future (async.dart:8:16)');
-    // Since Future is a subtype of FutureOr, we consider FutureOr to
-    // be an immediate supertype, even though the class declaration for Future
-    // doesn't mention FutureOr.
-    // TODO(scheglov) Use location matcher.
-    withElement.checkFutureOr(
-        decoratedSupertypes[1],
-        withElement.checkExplicitlyNonNullable,
-        (t, displayName) => withElement.checkTypeParameter(
-            t!, withElement.checkExplicitlyNonNullable, typeParam, displayName),
-        'Future (async.dart:8:16)');
-  }
-
-  Future test_getImmediateSupertypes_generic() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'class C extends Iterable {}',
-    );
-    var unitElement = withUnit.unitElement;
-    var class_ = unitElement.classes.single;
-    var t = class_.typeParameters.single;
-
-    var withElement = withUnit.withElement(class_);
-
-    var decoratedSupertypes =
-        withElement.decorator.getImmediateSupertypes(class_).toList();
-    expect(decoratedSupertypes, hasLength(1));
-    withElement.checkIterable(
-        decoratedSupertypes[0],
-        withElement.checkExplicitlyNonNullable,
-        (type, displayName) => withElement.checkTypeParameter(
-            type!, withElement.checkExplicitlyNonNullable, t, displayName),
-        'C (test.dart:1:7)');
-  }
-
-  Future test_getImmediateSupertypes_interface() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'class C implements num {}',
-    );
-    var unitElement = withUnit.unitElement;
-    var class_ = unitElement.classes.single;
-
-    var withElement = withUnit.withElement(class_);
-
-    var decoratedSupertypes =
-        withElement.decorator.getImmediateSupertypes(class_).toList();
-    expect(decoratedSupertypes, hasLength(2));
-    withElement.checkObject(decoratedSupertypes[0],
-        withElement.checkExplicitlyNonNullable, 'C (test.dart:1:7)');
-    withElement.checkNum(decoratedSupertypes[1],
-        withElement.checkExplicitlyNonNullable, 'C (test.dart:1:7)');
-  }
-
-  Future test_getImmediateSupertypes_mixin() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'class C with num {}',
-    );
-    var unitElement = withUnit.unitElement;
-    var class_ = unitElement.classes.single;
-
-    var withElement = withUnit.withElement(class_);
-
-    var decoratedSupertypes =
-        withElement.decorator.getImmediateSupertypes(class_).toList();
-    expect(decoratedSupertypes, hasLength(2));
-    withElement.checkObject(decoratedSupertypes[0],
-        withElement.checkExplicitlyNonNullable, 'C (test.dart:1:7)');
-    withElement.checkNum(decoratedSupertypes[1],
-        withElement.checkExplicitlyNonNullable, 'C (test.dart:1:7)');
-  }
-
-  Future test_getImmediateSupertypes_superclassConstraint() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'mixin C on num {}',
-    );
-    var unitElement = withUnit.unitElement;
-    var mixin_ = unitElement.mixins.single;
-
-    var withElement = withUnit.withElement(mixin_);
-
-    var decoratedSupertypes =
-        withElement.decorator.getImmediateSupertypes(mixin_).toList();
-    expect(decoratedSupertypes, hasLength(1));
-    withElement.checkNum(decoratedSupertypes[0],
-        withElement.checkExplicitlyNonNullable, 'C (test.dart:1:7)');
-  }
-
-  Future test_getImmediateSupertypes_supertype() async {
-    var withUnit = await _ContextWithFiles().buildUnitElement(
-      'class C {}',
-    );
-    var unitElement = withUnit.unitElement;
-    var class_ = unitElement.classes.single;
-
-    var withElement = withUnit.withElement(class_);
-
-    var decoratedSupertypes =
-        withElement.decorator.getImmediateSupertypes(class_).toList();
-    expect(decoratedSupertypes, hasLength(1));
-    // TODO(paulberry): displayName should be 'Object supertype of C'
-    withElement.checkObject(decoratedSupertypes[0],
-        withElement.checkExplicitlyNonNullable, 'C (test.dart:1:7)');
-  }
-}
-
-/// Specialization of [_AlreadyMigratedCodeDecoratorTestBase] for testing the
-/// situation where the already migrated code does not contain star types.  In
-/// the final product, by definition all already-migrated code will be free of
-/// star types.  However, since we do not yet migrate using a fully NNBD-aware
-/// SDK, we need to handle both star and non-star variants on a short term
-/// basis.
-@reflectiveTest
-class _AlreadyMigratedCodeDecoratorTestNormal
-    extends _AlreadyMigratedCodeDecoratorTestBase {
-  _AlreadyMigratedCodeDecoratorTestNormal() : super(NullabilitySuffix.none);
-}
-
-/// Specialization of [_AlreadyMigratedCodeDecoratorTestBase] for testing the
-/// situation where the already migrated code contains star types.  In the final
-/// product, this will never happen.  However, since we do not yet migrate using
-/// a fully NNBD-aware SDK, we need to handle both star and non-star variants on
-/// a short term basis.
-@reflectiveTest
-class _AlreadyMigratedCodeDecoratorTestProvisional
-    extends _AlreadyMigratedCodeDecoratorTestBase {
-  _AlreadyMigratedCodeDecoratorTestProvisional()
-      : super(NullabilitySuffix.star);
-}
-
-class _ContextWithElement with EdgeTester {
-  final _ContextWithUnitElement _withUnit;
-  final Element element;
-
-  final NullabilityGraphForTesting graph = NullabilityGraphForTesting();
-
-  _ContextWithElement(this._withUnit, this.element);
-
-  NullabilityNode get always => graph.always;
-
-  AlreadyMigratedCodeDecorator get decorator {
-    return AlreadyMigratedCodeDecorator(graph, typeProvider);
-  }
-
-  NullabilityNode get never => graph.never;
-
-  TypeProvider get typeProvider {
-    return _withUnit.typeProvider;
-  }
-
-  void checkAlwaysNullable(NullabilityNode node, String displayName) {
-    var edge = assertEdge(always, node, hard: true, checkable: false);
-    var origin = graph.getEdgeOrigin(edge)!;
-    expect(origin.kind, EdgeOriginKind.alwaysNullableType);
-    expect(origin.element, same(element));
-    expect(node.displayName, displayName);
-  }
-
-  void checkDynamic(DecoratedType? decoratedType, String displayName) {
-    expect(decoratedType!.type, same(typeProvider.dynamicType));
-    checkAlwaysNullable(decoratedType.node, displayName);
-  }
-
-  void checkExplicitlyNonNullable(NullabilityNode? node, String displayName) {
-    var edge = assertEdge(node, never, hard: true, checkable: false);
-    var origin = graph.getEdgeOrigin(edge)!;
-    expect(origin.kind, EdgeOriginKind.alreadyMigratedType);
-    expect(origin.element, same(element));
-    expect(node!.displayName, displayName);
-  }
-
-  void checkExplicitlyNullable(NullabilityNode? node, String displayName) {
-    var edge = assertEdge(always, node, hard: true, checkable: false);
-    var origin = graph.getEdgeOrigin(edge)!;
-    expect(origin.kind, EdgeOriginKind.alreadyMigratedType);
-    expect(origin.element, same(element));
-    expect(node!.displayName, displayName);
-  }
-
-  void checkFutureOr(
-    DecoratedType decoratedType,
-    void Function(NullabilityNode?, String) checkNullability,
-    void Function(DecoratedType?, String) checkArgument,
-    String displayName,
-  ) {
-    final type = decoratedType.type as InterfaceType;
-    expect(type.element, typeProvider.futureOrElement);
-    checkNullability(decoratedType.node, displayName);
-    checkArgument(
-        decoratedType.typeArguments[0], 'type argument 0 of $displayName');
-  }
-
-  void checkInt(
-    DecoratedType decoratedType,
-    void Function(NullabilityNode?, String) checkNullability,
-    String displayName,
-  ) {
-    final type = decoratedType.type as InterfaceType;
-    expect(type.element, typeProvider.intElement);
-    checkNullability(decoratedType.node, displayName);
-  }
-
-  void checkIterable(
-    DecoratedType decoratedType,
-    void Function(NullabilityNode?, String) checkNullability,
-    void Function(DecoratedType?, String) checkArgument,
-    String displayName,
-  ) {
-    final type = decoratedType.type as InterfaceType;
-    expect(type.element, typeProvider.iterableElement);
-    checkNullability(decoratedType.node, displayName);
-    checkArgument(
-        decoratedType.typeArguments[0], 'type argument 0 of $displayName');
-  }
-
-  void checkNever(DecoratedType decoratedType, String displayName) {
-    expect(decoratedType.type, same(typeProvider.neverType));
-    checkExplicitlyNonNullable(decoratedType.node, displayName);
-  }
-
-  void checkNum(
-    DecoratedType decoratedType,
-    void Function(NullabilityNode?, String) checkNullability,
-    String displayName,
-  ) {
-    final type = decoratedType.type as InterfaceType;
-    expect(type.element, typeProvider.numElement);
-    checkNullability(decoratedType.node, displayName);
-  }
-
-  void checkObject(
-    DecoratedType decoratedType,
-    void Function(NullabilityNode?, String) checkNullability,
-    String displayName,
-  ) {
-    final type = decoratedType.type as InterfaceType;
-    expect(type.element, typeProvider.objectType.element);
-    checkNullability(decoratedType.node, displayName);
-  }
-
-  void checkTypeParameter(
-    DecoratedType decoratedType,
-    void Function(NullabilityNode?, String) checkNullability,
-    TypeParameterElement expectedElement,
-    String displayName,
-  ) {
-    var type = decoratedType.type as TypeParameterTypeImpl;
-    expect(type.element, same(expectedElement));
-    checkNullability(decoratedType.node, displayName);
-  }
-
-  void checkVoid(DecoratedType decoratedType, String displayName) {
-    expect(decoratedType.type, same(typeProvider.voidType));
-    checkAlwaysNullable(decoratedType.node, displayName);
-  }
-
-  DecoratedType decorate(DartType type) {
-    var decoratedType = decorator.decorate(
-        type, element, NullabilityNodeTarget.text('test type'));
-    expect(decoratedType.type, same(type));
-    return decoratedType;
-  }
-}
-
-class _ContextWithFiles with ResourceProviderMixin {
-  Future<_ContextWithUnitElement> buildUnitElement(String content) async {
-    var file = newFile('/home/test/lib/test.dart', content);
-
-    var sdkRoot = newFolder('/sdk');
-    createMockSdk(
-      resourceProvider: resourceProvider,
-      root: sdkRoot,
-    );
-
-    var contextCollection = AnalysisContextCollection(
-      resourceProvider: resourceProvider,
-      includedPaths: [file.path],
-      sdkPath: sdkRoot.path,
-    );
-    var analysisContext = contextCollection.contextFor(file.path);
-    var analysisSession = analysisContext.currentSession;
-    var result = await analysisSession.getResolvedUnit(file.path);
-    return _ContextWithUnitElement(result as ResolvedUnitResult);
-  }
-
-  Future<_ContextWithElement> withEmptyUnit() async {
-    var withUnit = await buildUnitElement('');
-    return withUnit.withElement(withUnit.unitElement);
-  }
-}
-
-class _ContextWithUnitElement {
-  final ResolvedUnitResult _unitResult;
-
-  _ContextWithUnitElement(this._unitResult);
-
-  FindElement get findElement {
-    return FindElement(_unitResult.unit);
-  }
-
-  FindNode get findNode {
-    return FindNode(_unitResult.content, _unitResult.unit);
-  }
-
-  TypeProvider get typeProvider {
-    return unitElement.library.typeProvider;
-  }
-
-  CompilationUnitElement get unitElement {
-    return _unitResult.unit.declaredElement!;
-  }
-
-  _ContextWithElement withElement(Element element) {
-    return _ContextWithElement(this, element);
-  }
-}
diff --git a/pkg/nnbd_migration/test/api_test.dart b/pkg/nnbd_migration/test/api_test.dart
deleted file mode 100644
index d3e373828f60..000000000000
--- a/pkg/nnbd_migration/test/api_test.dart
+++ /dev/null
@@ -1,10866 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/analysis/results.dart';
-import 'package:analyzer/diagnostic/diagnostic.dart';
-import 'package:analyzer_plugin/protocol/protocol_common.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'abstract_context.dart';
-import 'api_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(_ProvisionalApiTest);
-    defineReflectiveTests(_ProvisionalApiTestPermissive);
-    defineReflectiveTests(_ProvisionalApiTestWithReset);
-  });
-}
-
-/// Tests of the provisional API.
-@reflectiveTest
-class _ProvisionalApiTest extends _ProvisionalApiTestBase
-    with _ProvisionalApiTestCases {
-  @override
-  bool get _usePermissiveMode => false;
-}
-
-/// Base class for provisional API tests.
-abstract class _ProvisionalApiTestBase extends AbstractContextTest {
-  String? projectPath;
-
-  bool get _usePermissiveMode;
-
-  void setUp() {
-    projectPath = convertPath(testsPath);
-    super.setUp();
-  }
-
-  /// Hook invoked between stages of processing inputs.
-  void _betweenStages() {}
-
-  /// Verifies that migration of the files in [input] produces the output in
-  /// [expectedOutput].
-  ///
-  /// Optional parameter [removeViaComments] indicates whether dead code should
-  /// be removed in its entirety (the default) or removed by commenting it out.
-  Future _checkMultipleFileChanges(
-      Map input, Map expectedOutput,
-      {Map migratedInput = const {},
-      bool removeViaComments = false,
-      bool warnOnWeakCode = false,
-      bool allowErrors = false}) async {
-    for (var path in migratedInput.keys) {
-      newFile(path, migratedInput[path]!);
-    }
-    for (var path in input.keys) {
-      newFile(path, input[path]!);
-    }
-    var listener = TestMigrationListener();
-    var migration = NullabilityMigration(listener,
-        permissive: _usePermissiveMode,
-        removeViaComments: removeViaComments,
-        warnOnWeakCode: warnOnWeakCode);
-    for (var path in input.keys) {
-      var resolvedLibrary = await session.getResolvedLibrary(path);
-      if (resolvedLibrary is ResolvedLibraryResult) {
-        for (var unit in resolvedLibrary.units) {
-          var errors =
-              unit.errors.where((e) => e.severity == Severity.error).toList();
-          if (!allowErrors && errors.isNotEmpty) {
-            fail('Unexpected error(s): $errors');
-          }
-          migration.prepareInput(unit);
-        }
-      }
-    }
-    expect(migration.unmigratedDependencies, isEmpty);
-    _betweenStages();
-    for (var path in input.keys) {
-      var resolvedLibrary = await session.getResolvedLibrary(path);
-      if (resolvedLibrary is ResolvedLibraryResult) {
-        for (var unit in resolvedLibrary.units) {
-          migration.processInput(unit);
-        }
-      }
-    }
-    _betweenStages();
-    for (var path in input.keys) {
-      var resolvedLibrary = await session.getResolvedLibrary(path);
-      if (resolvedLibrary is ResolvedLibraryResult) {
-        for (var unit in resolvedLibrary.units) {
-          migration.finalizeInput(unit);
-        }
-      }
-    }
-    migration.finish();
-    var sourceEdits = >{};
-    for (var entry in listener.edits.entries) {
-      var path = entry.key.fullName;
-      expect(expectedOutput.keys, contains(path));
-      sourceEdits[path] = entry.value;
-    }
-    for (var path in expectedOutput.keys) {
-      var sourceEditsForPath = sourceEdits[path] ?? [];
-      sourceEditsForPath.sort((a, b) => b.offset.compareTo(a.offset));
-      expect(SourceEdit.applySequence(input[path]!, sourceEditsForPath),
-          expectedOutput[path]);
-    }
-  }
-
-  /// Verifies that migration of the single file with the given [content]
-  /// produces the [expected] output.
-  ///
-  /// Optional parameter [removeViaComments] indicates whether dead code should
-  /// be removed in its entirety (the default) or removed by commenting it out.
-  Future _checkSingleFileChanges(String content, dynamic expected,
-      {Map migratedInput = const {},
-      bool removeViaComments = false,
-      bool warnOnWeakCode = false,
-      bool allowErrors = false}) async {
-    var sourcePath = convertPath('$testsPath/lib/test.dart');
-    await _checkMultipleFileChanges(
-        {sourcePath: content}, {sourcePath: expected},
-        migratedInput: migratedInput,
-        removeViaComments: removeViaComments,
-        warnOnWeakCode: warnOnWeakCode,
-        allowErrors: allowErrors);
-  }
-}
-
-/// Mixin containing test cases for the provisional API.
-mixin _ProvisionalApiTestCases on _ProvisionalApiTestBase {
-  Future test_accept_required_hint() async {
-    var content = '''
-f({/*required*/ int i}) {}
-''';
-    var expected = '''
-f({required int i}) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_accept_required_hint_nullable() async {
-    var content = '''
-f({/*required*/ int i}) {}
-g() {
-  f(i: null);
-}
-''';
-    var expected = '''
-f({required int? i}) {}
-g() {
-  f(i: null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_add_explicit_parameter_type() async {
-    var content = '''
-abstract class C {
-  void m(T Function(T) callback);
-}
-void test(C c) {
-  c.m((value) => value + 1);
-}
-''';
-    // Under the new NNBD rules, `value` gets an inferred type of `Object?`.  We
-    // need to change this to `dynamic` to avoid an "undefined operator +"
-    // error.
-    var expected = '''
-abstract class C {
-  void m(T Function(T)? callback);
-}
-void test(C c) {
-  c.m((dynamic value) => value + 1);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40476')
-  Future test_add_explicit_parameter_type_interpolation() async {
-    var content = r'''
-abstract class C {
-  void m(T Function(T) callback);
-}
-void test(C c) {
-  c.m((value) => '$value';
-}
-''';
-    // Under the new NNBD rules, `value` gets an inferred type of `Object?`,
-    // whereas it previously had a type of `dynamic`.  But we don't need to fix
-    // it because `Object?` supports `toString`.
-    var expected = r'''
-abstract class C {
-  void m(T Function(T) callback);
-}
-void test(C c) {
-  c.m((value) => '$value';
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40476')
-  Future test_add_explicit_parameter_type_object_method() async {
-    var content = '''
-abstract class C {
-  void m(T Function(T) callback);
-}
-void test(C c) {
-  c.m((value) => value.toString());
-}
-''';
-    // Under the new NNBD rules, `value` gets an inferred type of `Object?`,
-    // whereas it previously had a type of `dynamic`.  But we don't need to fix
-    // it because `Object?` supports `toString`.
-    var expected = '''
-abstract class C {
-  void m(T Function(T) callback);
-}
-void test(C c) {
-  c.m((value) => value.toString());
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40476')
-  Future test_add_explicit_parameter_type_unused() async {
-    var content = '''
-abstract class C {
-  void m(T Function(T) callback);
-}
-void test(C c) {
-  c.m((value) => 0);
-}
-''';
-    // Under the new NNBD rules, `value` gets an inferred type of `Object?`,
-    // whereas it previously had a type of `dynamic`.  But we don't need to fix
-    // it because it's unused.
-    var expected = '''
-abstract class C {
-  void m(T Function(T) callback);
-}
-void test(C c) {
-  c.m((value) => 0);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_add_required() async {
-    var content = '''
-int f({String s}) => s.length;
-''';
-    var expected = '''
-int f({required String s}) => s.length;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/39404')
-  Future test_add_type_parameter_bound() async {
-    /// After a migration, a bound may be made nullable. Instantiate-to-bounds
-    /// may need to be made explicit where the migration engine prefers a
-    /// non-null type.
-    var content = '''
-class C {}
-
-void main() {
-  C c = C();
-}
-''';
-    var expected = '''
-class C {}
-
-void main() {
-  C c = C();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_ambiguous_bang_hint_after_as() async {
-    var content = '''
-T f(Object/*?*/ x) => x as T/*!*/;
-''';
-    // The `/*!*/` is considered to apply to the type `T`, not to the expression
-    // `x as T`, so we shouldn't produce `(x as T)!`.
-    var expected = '''
-T f(Object? x) => x as T;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_ambiguous_bang_hint_after_as_assigned() async {
-    var content = '''
-T f(Object/*?*/ x, T/*!*/ y) => y = x as T/*!*/;
-''';
-    // The `/*!*/` is considered to apply to the type `T`, not to the expression
-    // `y = x as T`, so we shouldn't produce `(y = x as T)!`.
-    var expected = '''
-T f(Object? x, T y) => y = x as T;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_ambiguous_bang_hint_after_is() async {
-    var content = '''
-bool f(Object/*?*/ x) => x is T/*!*/;
-''';
-    // The `/*!*/` is considered to apply to the type `T`, not to the expression
-    // `x is T`, so we shouldn't produce `(x is T)!`.
-    var expected = '''
-bool f(Object? x) => x is T;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_ambiguous_bang_hint_after_is_conditional() async {
-    var content = '''
-dynamic f(Object/*?*/ x, dynamic y) => y ? y : x is T/*!*/;
-''';
-    // The `/*!*/` is considered to apply to the type `T`, not to the expression
-    // `y ? y : x is T`, so we shouldn't produce `(y ? y : x is T)!`.
-    var expected = '''
-dynamic f(Object? x, dynamic y) => y ? y : x is T;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_ambiguous_closure_parameter_in_local_variable() async {
-    var content = '''
-Object _f(Object Function(T) callback, Object obj) => 0;
-g() {
-  var y = _f>(
-      (x) => x.keys,
-      _f>(
-          (x) => x.last, 0));
-}
-''';
-    var expected = '''
-Object _f(Object Function(T) callback, Object obj) => 0;
-g() {
-  var y = _f>(
-      (x) => x.keys,
-      _f>(
-          (x) => x.last, 0));
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_component_attribute() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-@Component(
-  selector: 'my-component'
-)
-class MyComponent {
-  int foo;
-  MyComponent(@Attribute('foo') this.foo);
-}
-''';
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-@Component(
-  selector: 'my-component'
-)
-class MyComponent {
-  int? foo;
-  MyComponent(@Attribute('foo') this.foo);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_component_constructor() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-@Component(
-  selector: 'my-component'
-)
-class MyComponent {
-  int foo;
-  MyComponent(this.foo);
-  void nullifyFoo() { foo = null; }
-}
-''';
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-@Component(
-  selector: 'my-component'
-)
-class MyComponent {
-  int? foo;
-  MyComponent(int this.foo);
-  void nullifyFoo() { foo = null; }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_contentChild_field() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  // Initialize this.bar in the constructor just so the migration tool doesn't
-  // decide to make it nullable due to the lack of initializer.
-  MyComponent(this.bar);
-
-  @ContentChild('foo')
-  Element bar;
-}
-''';
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  // Initialize this.bar in the constructor just so the migration tool doesn't
-  // decide to make it nullable due to the lack of initializer.
-  MyComponent(this.bar);
-
-  @ContentChild('foo')
-  Element? bar;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_contentChild_field_not_late() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  @ContentChild('foo')
-  Element bar;
-  Element baz;
-
-  f(Element /*!*/ e) {
-    bar = e;
-    baz = e;
-  }
-  g() => bar.id;
-  h() => baz.id;
-}
-''';
-    // `late` heuristics are disabled for `bar` since it's marked with
-    // `ContentChild`.  But they do apply to `baz`.
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  @ContentChild('foo')
-  Element? bar;
-  late Element baz;
-
-  f(Element e) {
-    bar = e;
-    baz = e;
-  }
-  g() => bar!.id;
-  h() => baz.id;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_contentChildren_field_not_late() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class myComponent {
-  @ContentChildren('foo')
-  Element bar;
-  Element baz;
-
-  f(Element /*!*/ e) {
-    bar = e;
-    baz = e;
-  }
-  g() => bar.id;
-  h() => baz.id;
-}
-''';
-    // `late` heuristics are disabled for `bar` since it's marked with
-    // `ContentChildren`.  But they do apply to `baz`.
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class myComponent {
-  @ContentChildren('foo')
-  Element? bar;
-  late Element baz;
-
-  f(Element e) {
-    bar = e;
-    baz = e;
-  }
-  g() => bar!.id;
-  h() => baz.id;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_injectable_constructor() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-@Injectable()
-class MyClass {
-  int foo;
-  MyClass(this.foo);
-  void nullifyFoo() { foo = null; }
-}
-''';
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-@Injectable()
-class MyClass {
-  int? foo;
-  MyClass(int this.foo);
-  void nullifyFoo() { foo = null; }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_injectable_function() async {
-    addAngularPackage();
-    var content = '''
-import 'package:angular/angular.dart';
-
-class C {}
-
-@Injectable()
-C createC(int n, @Optional() int x) => C();
-''';
-    var expected = '''
-import 'package:angular/angular.dart';
-
-class C {}
-
-@Injectable()
-C createC(int n, @Optional() int? x) => C();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_optional_constructor_param() async {
-    addAngularPackage();
-    var content = '''
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  MyComponent(@Optional() String foo);
-}
-''';
-    var expected = '''
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  MyComponent(@Optional() String? foo);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_optional_constructor_param_field_formal() async {
-    addAngularPackage();
-    var content = '''
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  String foo;
-  MyComponent(@Optional() this.foo);
-}
-''';
-    var expected = '''
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  String? foo;
-  MyComponent(@Optional() this.foo);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_optional_constructor_param_internal() async {
-    addAngularPackage(internalUris: true);
-    var content = '''
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  MyComponent(@Optional() String foo);
-}
-''';
-    var expected = '''
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  MyComponent(@Optional() String? foo);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_viewChild_field() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  // Initialize this.bar in the constructor just so the migration tool doesn't
-  // decide to make it nullable due to the lack of initializer.
-  MyComponent(this.bar);
-
-  @ViewChild('foo')
-  Element bar;
-}
-''';
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  // Initialize this.bar in the constructor just so the migration tool doesn't
-  // decide to make it nullable due to the lack of initializer.
-  MyComponent(this.bar);
-
-  @ViewChild('foo')
-  Element? bar;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_viewChild_field_internal() async {
-    addAngularPackage(internalUris: true);
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  // Initialize this.bar in the constructor just so the migration tool doesn't
-  // decide to make it nullable due to the lack of initializer.
-  MyComponent(this.bar);
-
-  @ViewChild('foo')
-  Element bar;
-}
-''';
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  // Initialize this.bar in the constructor just so the migration tool doesn't
-  // decide to make it nullable due to the lack of initializer.
-  MyComponent(this.bar);
-
-  @ViewChild('foo')
-  Element? bar;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_viewChild_field_not_late() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  @ViewChild('foo')
-  Element bar;
-  Element baz;
-
-  f(Element /*!*/ e) {
-    bar = e;
-    baz = e;
-  }
-  g() => bar.id;
-  h() => baz.id;
-}
-''';
-    // `late` heuristics are disabled for `bar` since it's marked with
-    // `ViewChild`.  But they do apply to `baz`.
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  @ViewChild('foo')
-  Element? bar;
-  late Element baz;
-
-  f(Element e) {
-    bar = e;
-    baz = e;
-  }
-  g() => bar!.id;
-  h() => baz.id;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_viewChild_setter() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  @ViewChild('foo')
-  set bar(Element element) {}
-}
-''';
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class MyComponent {
-  @ViewChild('foo')
-  set bar(Element? element) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_angular_viewChildren_field_not_late() async {
-    addAngularPackage();
-    var content = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class myComponent {
-  @ViewChildren('foo')
-  Element bar;
-  Element baz;
-
-  f(Element /*!*/ e) {
-    bar = e;
-    baz = e;
-  }
-  g() => bar.id;
-  h() => baz.id;
-}
-''';
-    // `late` heuristics are disabled for `bar` since it's marked with
-    // `ViewChildren`.  But they do apply to `baz`.
-    var expected = '''
-import 'dart:html';
-import 'package:angular/angular.dart';
-
-class myComponent {
-  @ViewChildren('foo')
-  Element? bar;
-  late Element baz;
-
-  f(Element e) {
-    bar = e;
-    baz = e;
-  }
-  g() => bar!.id;
-  h() => baz.id;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_annotation_named_constructor() async {
-    var content = '''
-class C {
-  final List values;
-  const factory C.ints(List list) = C;
-  const C(this.values);
-}
-
-@C.ints([1, 2, 3])
-class D {}
-''';
-    var expected = '''
-class C {
-  final List? values;
-  const factory C.ints(List? list) = C;
-  const C(this.values);
-}
-
-@C.ints([1, 2, 3])
-class D {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_argumentError_checkNotNull_implies_non_null_intent() async {
-    var content = '''
-void f(int i) {
-  ArgumentError.checkNotNull(i);
-}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(int i) {
-  ArgumentError.checkNotNull(i);
-}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_as_allows_null() async {
-    var content = '''
-int f(Object o) => (o as int)?.gcd(1);
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-int? f(Object? o) => (o as int?)?.gcd(1);
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_assign_null_to_generic_type() async {
-    var content = '''
-main() {
-  List x = null;
-}
-''';
-    var expected = '''
-main() {
-  List? x = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_assignment_to_promoted_var_can_undo_promotion() async {
-    var content = '''
-abstract class C {
-  void test() {
-    var x = f();
-    while (x != null) {
-      x = f();
-    }
-  }
-  int/*?*/ f();
-}
-''';
-    var expected = '''
-abstract class C {
-  void test() {
-    var x = f();
-    while (x != null) {
-      x = f();
-    }
-  }
-  int? f();
-}
-''';
-    // Prior to the fix for https://github.com/dart-lang/sdk/issues/41411,
-    // migration would consider the LHS of `x = f()` to have context type
-    // non-nullable `int`, so it would add a null check to the value returned
-    // from `f`.
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_at_required_to_required_in_redirecting_factory() async {
-    // Redirecting factory constructors have special logic to suppress some of
-    // the usual heuristics for adding `required`, since it's allowed for a
-    // redirecting factory constructor to have a non-required non-nullable
-    // argument with no default.  But we need to make sure that we still convert
-    // `@required` to `required`.
-    addMetaPackage();
-    var content = r'''
-import 'package:meta/meta.dart';
-abstract class A {
-  int get v;
-  A._();
-  factory A({@required int v}) = B._;
-}
-class B extends A {
-  @override
-  final int v;
-  B._({this.v}) : super._();
-}
-''';
-    var expected = r'''
-import 'package:meta/meta.dart';
-abstract class A {
-  int? get v;
-  A._();
-  factory A({required int v}) = B._;
-}
-class B extends A {
-  @override
-  final int? v;
-  B._({this.v}) : super._();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_avoid_redundant_future_or() async {
-    // FutureOr and FutureOr? are equivalent types; we never insert
-    // the redundant second `?`.
-    var content = '''
-import 'dart:async';
-abstract class C {
-  FutureOr f();
-  FutureOr/*?*/ g();
-  FutureOr h(bool b) => b ? f() : g();
-}
-''';
-    var expected = '''
-import 'dart:async';
-abstract class C {
-  FutureOr f();
-  FutureOr? g();
-  FutureOr h(bool b) => b ? f() : g();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_await_null() async {
-    var content = '''
-Future test() async {
-  return await null;
-}
-''';
-    var expected = '''
-Future test() async {
-  return await null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_await_nullable_future_to_non_nullable() async {
-    var content = '''
-Future foo() async => null;
-
-Future bar() async {
-  return await foo();
-}
-''';
-    var expected = '''
-Future foo() async => null;
-
-Future bar() async {
-  return (await foo())!;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_back_propagation_stops_at_implicitly_typed_variables() async {
-    var content = '''
-class C {
-  int v;
-  C(this.v);
-}
-f(C c) {
-  var x = c.v;
-  print(x + 1);
-}
-main() {
-  C(null);
-}
-''';
-    var expected = '''
-class C {
-  int? v;
-  C(this.v);
-}
-f(C c) {
-  var x = c.v!;
-  print(x + 1);
-}
-main() {
-  C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_built_value_non_nullable_getter() async {
-    addBuiltValuePackage();
-    var root = '$projectPath/lib';
-    var path1 = convertPath('$root/lib.dart');
-    var file1 = r'''
-import 'package:built_value/built_value.dart';
-
-part 'lib.g.dart';
-
-abstract class Foo implements Built {
-  int get value;
-  Foo._();
-  factory Foo([void Function(FooBuilder) updates]) = _$Foo;
-}
-''';
-    var expected1 = r'''
-import 'package:built_value/built_value.dart';
-
-part 'lib.g.dart';
-
-abstract class Foo implements Built {
-  int get value;
-  Foo._();
-  factory Foo([void Function(FooBuilder) updates]) = _$Foo;
-}
-''';
-    // Note: in a real-world scenario the generated file would be in a different
-    // directory but we don't need to simulate that detail for this test.  Also,
-    // the generated file would have a lot more code in it, but we don't need to
-    // simulate all the details of what is generated.
-    var path2 = convertPath('$root/lib.g.dart');
-    var file2 = r'''
-part of 'lib.dart';
-
-class _$Foo extends Foo {
-  @override
-  final int value;
-
-  factory _$Foo([void Function(FooBuilder) updates]) => throw '';
-
-  _$Foo._({this.value}) : super._() {
-    BuiltValueNullFieldError.checkNotNull(value, 'Foo', 'value');
-  }
-}
-
-class FooBuilder implements Builder {
-  int get value => throw '';
-}
-''';
-    await _checkMultipleFileChanges(
-        {path1: file1, path2: file2}, {path1: expected1, path2: anything});
-  }
-
-  Future test_built_value_nullable_getter() async {
-    addBuiltValuePackage();
-    var root = '$projectPath/lib';
-    var path1 = convertPath('$root/lib.dart');
-    var file1 = r'''
-import 'package:built_value/built_value.dart';
-
-part 'lib.g.dart';
-
-abstract class Foo implements Built {
-  @nullable
-  int get value;
-  Foo._();
-  factory Foo([void Function(FooBuilder) updates]) = _$Foo;
-}
-''';
-    var expected1 = r'''
-import 'package:built_value/built_value.dart';
-
-part 'lib.g.dart';
-
-abstract class Foo implements Built {
-  int? get value;
-  Foo._();
-  factory Foo([void Function(FooBuilder) updates]) = _$Foo;
-}
-''';
-    // Note: in a real-world scenario the generated file would be in a different
-    // directory but we don't need to simulate that detail for this test.  Also,
-    // the generated file would have a lot more code in it, but we don't need to
-    // simulate all the details of what is generated.
-    var path2 = convertPath('$root/lib.g.dart');
-    var file2 = r'''
-part of 'lib.dart';
-
-class _$Foo extends Foo {
-  @override
-  final int value;
-
-  factory _$Foo([void Function(FooBuilder) updates]) => throw '';
-
-  _$Foo._({this.value}) : super._();
-}
-
-class FooBuilder implements Builder {
-  int get value => throw '';
-}
-''';
-    await _checkMultipleFileChanges(
-        {path1: file1, path2: file2}, {path1: expected1, path2: anything});
-  }
-
-  Future test_built_value_nullable_getter_interface_only() async {
-    addBuiltValuePackage();
-    var content = '''
-import 'package:built_value/built_value.dart';
-
-abstract class Foo {
-  @nullable
-  int get value;
-}
-''';
-    var expected = '''
-import 'package:built_value/built_value.dart';
-
-abstract class Foo {
-  int? get value;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_already_migrated_extension() async {
-    var content = '''
-import 'already_migrated.dart';
-void f() {
-  [].g();
-}
-''';
-    var alreadyMigrated = '''
-// @dart=2.12
-extension Ext on List {
-  g() {}
-}
-''';
-    var expected = '''
-import 'already_migrated.dart';
-void f() {
-  [].g();
-}
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/already_migrated.dart': alreadyMigrated
-    });
-  }
-
-  Future test_call_already_migrated_extension_null_aware() async {
-    var content = '''
-import 'already_migrated.dart';
-class C {
-  X m(V v) => v?.toX();
-}
-''';
-    var alreadyMigrated = '''
-// @dart=2.12
-class X {}
-class V {}
-extension Ext on V {
-  X toX() => X();
-}
-''';
-    var expected = '''
-import 'already_migrated.dart';
-class C {
-  X? m(V? v) => v?.toX();
-}
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/already_migrated.dart': alreadyMigrated
-    });
-  }
-
-  Future test_call_generic_function_returns_generic_class() async {
-    var content = '''
-class B implements List {
-  final C c;
-  B(this.c);
-  B cast() => c._castFrom(this);
-  noSuchMethod(invocation) => super.noSuchMethod(invocation);
-}
-abstract class C {
-  B _castFrom(B source);
-}
-''';
-    var expected = '''
-class B implements List {
-  final C c;
-  B(this.c);
-  B cast() => c._castFrom(this);
-  noSuchMethod(invocation) => super.noSuchMethod(invocation);
-}
-abstract class C {
-  B _castFrom(B source);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_migrated_base_class_method_non_nullable() async {
-    var content = '''
-abstract class M implements Map {}
-void _f(bool b, M m, int i) {
-  if (b) {
-    m['x'] = i;
-  }
-}
-void _g(bool b, M m) {
-  _f(b, m, null);
-}
-''';
-    var expected = '''
-abstract class M implements Map {}
-void _f(bool b, M m, int? i) {
-  if (b) {
-    m['x'] = i;
-  }
-}
-void _g(bool b, M m) {
-  _f(b, m, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_migrated_base_class_method_nullable() async {
-    var content = '''
-abstract class M implements Map {}
-int f(M m) => m['x'];
-''';
-    var expected = '''
-abstract class M implements Map {}
-int? f(M m) => m['x'];
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_tearoff() async {
-    var content = '''
-class C {
-  void call() {}
-}
-void Function() f(C c) => c;
-''';
-    var expected = '''
-class C {
-  void call() {}
-}
-void Function() f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_tearoff_already_migrated() async {
-    var content = '''
-import 'already_migrated.dart';
-void Function() f(C c) => c;
-''';
-    var alreadyMigrated = '''
-// @dart=2.12
-class C {
-  void call() {}
-}
-''';
-    var expected = '''
-import 'already_migrated.dart';
-void Function() f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/already_migrated.dart': alreadyMigrated
-    });
-  }
-
-  Future
-      test_call_tearoff_already_migrated_propagate_nullability() async {
-    var content = '''
-import 'already_migrated.dart';
-Map Function() f(C c) => c;
-''';
-    var alreadyMigrated = '''
-// @dart=2.12
-class C {
-  Map call() => {};
-}
-''';
-    var expected = '''
-import 'already_migrated.dart';
-Map Function() f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/already_migrated.dart': alreadyMigrated
-    });
-  }
-
-  Future test_call_tearoff_already_migrated_with_substitution() async {
-    var content = '''
-import 'already_migrated.dart';
-Map Function() f(C c) => c;
-''';
-    var alreadyMigrated = '''
-// @dart=2.12
-class C {
-  Map call() => {};
-}
-''';
-    var expected = '''
-import 'already_migrated.dart';
-Map Function() f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/already_migrated.dart': alreadyMigrated
-    });
-  }
-
-  Future test_call_tearoff_futureOr() async {
-    var content = '''
-import 'dart:async';
-class C {
-  void call() {}
-}
-FutureOr f(C c) => c;
-''';
-    var expected = '''
-import 'dart:async';
-class C {
-  void call() {}
-}
-FutureOr f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_tearoff_inherited() async {
-    var content = '''
-class B {
-  void call() {}
-}
-class C extends B {}
-void Function() f(C c) => c;
-''';
-    var expected = '''
-class B {
-  void call() {}
-}
-class C extends B {}
-void Function() f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_tearoff_inherited_propagate_nullability() async {
-    var content = '''
-class B {
-  Map call() => {1: null};
-}
-class C extends B {}
-Map Function() f(C c) => c;
-''';
-    var expected = '''
-class B {
-  Map call() => {1: null};
-}
-class C extends B {}
-Map Function() f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_tearoff_propagate_nullability() async {
-    var content = '''
-class C {
-  Map call() => {1: null};
-}
-Map Function() f(C c) => c;
-''';
-    var expected = '''
-class C {
-  Map call() => {1: null};
-}
-Map Function() f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_call_tearoff_raw_function() async {
-    var content = '''
-class C {
-  void call() {}
-}
-Function f(C c) => c;
-''';
-    var expected = '''
-class C {
-  void call() {}
-}
-Function f(C c) => c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_cascade_on_nullable() async {
-    var content = '''
-class C {
-  int /*?*/ x;
-  void f() {
-    x..isEven;
-  }
-}
-''';
-    var expected = '''
-class C {
-  int? x;
-  void f() {
-    x!..isEven;
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_catch_simple() async {
-    var content = '''
-void f() {
-  try {} catch (ex, st) {}
-}
-''';
-    var expected = '''
-void f() {
-  try {} catch (ex, st) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_catch_simple_with_modifications() async {
-    var content = '''
-void f(String x, StackTrace y) {
-  try {} catch (ex, st) {
-    ex = x;
-    st = y;
-  }
-}
-main() {
-  f(null, null);
-}
-''';
-    var expected = '''
-void f(String? x, StackTrace? y) {
-  try {} catch (ex, st) {
-    ex = x;
-    st = y!;
-  }
-}
-main() {
-  f(null, null);
-}
-''';
-    // Note: using allowErrors=true because variables introduced by a catch
-    // clause are final
-    await _checkSingleFileChanges(content, expected, allowErrors: true);
-  }
-
-  Future test_catch_with_on() async {
-    var content = '''
-void f() {
-  try {} on String catch (ex, st) {}
-}
-''';
-    var expected = '''
-void f() {
-  try {} on String catch (ex, st) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_catch_with_on_with_modifications() async {
-    var content = '''
-void f(String x, StackTrace y) {
-  try {} on String catch (ex, st) {
-    ex = x;
-    st = y;
-  }
-}
-main() {
-  f(null, null);
-}
-''';
-    var expected = '''
-void f(String? x, StackTrace? y) {
-  try {} on String? catch (ex, st) {
-    ex = x;
-    st = y!;
-  }
-}
-main() {
-  f(null, null);
-}
-''';
-    // Note: using allowErrors=true because variables introduced by a catch
-    // clause are final
-    await _checkSingleFileChanges(content, expected, allowErrors: true);
-  }
-
-  Future test_class_alias_synthetic_constructor_with_parameters() async {
-    var content = '''
-void main() {
-  D d = D(null);
-}
-class C {
-  C(int i);
-}
-mixin M {}
-class D = C with M;
-''';
-    var expected = '''
-void main() {
-  D d = D(null);
-}
-class C {
-  C(int? i);
-}
-mixin M {}
-class D = C with M;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_class_alias_synthetic_constructor_with_parameters_and_subclass() async {
-    var content = '''
-void main() {
-  E e = E(null);
-}
-class C {
-  C(int i);
-}
-mixin M {}
-class D = C with M;
-class E extends D {
-  E(int i) : super(i);
-}
-''';
-    var expected = '''
-void main() {
-  E e = E(null);
-}
-class C {
-  C(int? i);
-}
-mixin M {}
-class D = C with M;
-class E extends D {
-  E(int? i) : super(i);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_class_type_param_bound_references_class() async {
-    var content = '''
-class Node> {
-  final List nodes = [];
-}
-class C extends Node {}
-main() {
-  var x = C();
-  x.nodes.add(x);
-}
-''';
-    var expected = '''
-class Node> {
-  final List nodes = [];
-}
-class C extends Node {}
-main() {
-  var x = C();
-  x.nodes.add(x);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_class_with_default_constructor() async {
-    var content = '''
-void main() => _f(Foo());
-_f(Foo f) {}
-class Foo {}
-''';
-    var expected = '''
-void main() => _f(Foo());
-_f(Foo f) {}
-class Foo {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_code_inside_switch_does_not_imply_non_null_intent() async {
-    var content = '''
-int _f(int i, int j) {
-  switch (i) {
-    case 0:
-      return j + 1;
-    default:
-      return 0;
-  }
-}
-int _g(int i, int j) {
-  if (i == 0) {
-    return _f(i, j);
-  } else {
-    return 0;
-  }
-}
-main() {
-  _g(0, null);
-}
-''';
-    var expected = '''
-int _f(int i, int? j) {
-  switch (i) {
-    case 0:
-      return j! + 1;
-    default:
-      return 0;
-  }
-}
-int _g(int i, int? j) {
-  if (i == 0) {
-    return _f(i, j);
-  } else {
-    return 0;
-  }
-}
-main() {
-  _g(0, null);
-}
-''';
-    // Note: prior to the fix for https://github.com/dart-lang/sdk/issues/41407,
-    // we would consider the use of `j` in `f` to establish non-null intent, so
-    // the null check would be erroneously placed in `g`'s call to `f`.
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future test_collection_literal_typed_list() async {
-    var content = '''
-void f(int/*?*/ x, int/*?*/ y) {
-  g([x, y]);
-}
-g(List/*!*/ z) {}
-''';
-    var expected = '''
-void f(int? x, int? y) {
-  g([x!, y!]);
-}
-g(List z) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_collection_literal_typed_map() async {
-    var content = '''
-void f(int/*?*/ x, int/*?*/ y) {
-  g({x: y});
-}
-g(Map/*!*/ z) {}
-''';
-    var expected = '''
-void f(int? x, int? y) {
-  g({x!: y!});
-}
-g(Map z) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_collection_literal_typed_set() async {
-    var content = '''
-void f(int/*?*/ x, int/*?*/ y) {
-  g({x, y});
-}
-g(Set/*!*/ z) {}
-''';
-    var expected = '''
-void f(int? x, int? y) {
-  g({x!, y!});
-}
-g(Set z) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_collection_literal_untyped_list() async {
-    var content = '''
-void f(int/*?*/ x, int/*?*/ y) {
-  g([x, y]);
-}
-g(List/*!*/ z) {}
-''';
-    var expected = '''
-void f(int? x, int? y) {
-  g([x!, y!]);
-}
-g(List z) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_collection_literal_untyped_map() async {
-    var content = '''
-void f(int/*?*/ x, int/*?*/ y) {
-  g({x: y});
-}
-g(Map/*!*/ z) {}
-''';
-    var expected = '''
-void f(int? x, int? y) {
-  g({x!: y!});
-}
-g(Map z) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_collection_literal_untyped_set() async {
-    var content = '''
-void f(int/*?*/ x, int/*?*/ y) {
-  g({x, y});
-}
-g(Set/*!*/ z) {}
-''';
-    var expected = '''
-void f(int? x, int? y) {
-  g({x!, y!});
-}
-g(Set z) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_comment_bang_implies_non_null_intent() async {
-    var content = '''
-void f(int/*!*/ i) {}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(int i) {}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_comment_question_implies_nullable() async {
-    var content = '''
-void _f() {
-  int/*?*/ i = 0;
-}
-''';
-    var expected = '''
-void _f() {
-  int? i = 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_conditional_assert_statement_does_not_imply_non_null_intent() async {
-    var content = '''
-void f(bool b, int i) {
-  if (b) return;
-  assert(i != null);
-}
-void g(bool b, int i) {
-  if (b) f(b, i);
-}
-main() {
-  g(true, null);
-}
-''';
-    var expected = '''
-void f(bool b, int? i) {
-  if (b) return;
-  assert(i != null);
-}
-void g(bool b, int? i) {
-  if (b) f(b, i);
-}
-main() {
-  g(true, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_conditional_dereference_does_not_imply_non_null_intent() async {
-    var content = '''
-void f(bool b, int i) {
-  if (b) i.abs();
-}
-void g(bool b, int i) {
-  if (b) f(b, i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(bool b, int? i) {
-  if (b) i!.abs();
-}
-void g(bool b, int? i) {
-  if (b) f(b, i);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_conditional_expression_futureOr() async {
-    var content = '''
-import 'dart:async';
-FutureOr f(bool b, FutureOr/*!*/ n) => b ? n : 0;
-''';
-    var expected = '''
-import 'dart:async';
-FutureOr f(bool b, FutureOr n) => b ? n : 0;
-''';
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future test_conditional_expression_guard_subexpression() async {
-    var content = '''
-void f(String s, int x, int/*?*/ n) {
-  s == null ? (x = n) : (x = s.length);
-}
-''';
-    var expected = '''
-void f(String? s, int? x, int? n) {
-  s == null ? (x = n) : (x = s.length);
-}
-''';
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future test_conditional_expression_guard_value_ifFalse() async {
-    var content = 'int f(String s, int/*?*/ n) => s != null ? s.length : n;';
-    var expected = 'int? f(String? s, int? n) => s != null ? s.length : n;';
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future test_conditional_expression_guard_value_ifTrue() async {
-    var content = 'int f(String s, int/*?*/ n) => s == null ? n : s.length;';
-    var expected = 'int? f(String? s, int? n) => s == null ? n : s.length;';
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future
-      test_conditional_non_null_usage_does_not_imply_non_null_intent() async {
-    var content = '''
-void _f(bool b, int i, int j) {
-  if (b) i.gcd(j);
-}
-void _g(bool b, int i, int j) {
-  if (b) _f(b, i, j);
-}
-main() {
-  _g(false, 0, null);
-}
-''';
-    var expected = '''
-void _f(bool b, int i, int? j) {
-  if (b) i.gcd(j!);
-}
-void _g(bool b, int i, int? j) {
-  if (b) _f(b, i, j);
-}
-main() {
-  _g(false, 0, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_conditional_usage_does_not_propagate_non_null_intent() async {
-    var content = '''
-void _f(int i) {
-  assert(i != null);
-}
-void _g(bool b, int i) {
-  if (b) _f(i);
-}
-void _h(bool b1, bool b2, int i) {
-  if (b1) _g(b2, i);
-}
-main() {
-  _h(true, false, null);
-}
-''';
-    var expected = '''
-void _f(int i) {
-  assert(i != null);
-}
-void _g(bool b, int? i) {
-  if (b) _f(i!);
-}
-void _h(bool b1, bool b2, int? i) {
-  if (b1) _g(b2, i);
-}
-main() {
-  _h(true, false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_conditionalExpression_typeParameter_bound() async {
-    var content = '''
-num _f1(bool b, num x, T y) => b ? x : y;
-num _f2(bool b, num x, T y) => b ? x : y;
-num _f3(bool b, num x, T y) => b ? x : y;
-num _f4(bool b, num x, T y) => b ? x : y;
-
-void main() {
-  int x1 = _f1(true, 0, null);
-  int x2 = _f2(true, 0, null);
-  int x3 = _f3(true, null, 0);
-  int x4 = _f4(true, 0, 0);
-}
-''';
-    var expected = '''
-num? _f1(bool b, num x, T y) => b ? x : y;
-num? _f2(bool b, num x, T? y) => b ? x : y;
-num? _f3(bool b, num? x, T y) => b ? x : y;
-num _f4(bool b, num x, T y) => b ? x : y;
-
-void main() {
-  int? x1 = _f1(true, 0, null) as int?;
-  int? x2 = _f2(true, 0, null) as int?;
-  int? x3 = _f3(true, null, 0) as int?;
-  int x4 = _f4(true, 0, 0) as int;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_constructor_field_formal_resolves_to_getter() async {
-    var content = '''
-class C {
-  int get i => 0;
-  C(this.i);
-}
-''';
-    // It doesn't matter what the migration produces; we just want to make sure
-    // there isn't a crash.
-    await _checkSingleFileChanges(content, anything, allowErrors: true);
-  }
-
-  Future test_constructor_field_formal_resolves_to_setter() async {
-    var content = '''
-class C {
-  set i(int value) {}
-  C(this.i);
-}
-''';
-    // It doesn't matter what the migration produces; we just want to make sure
-    // there isn't a crash.
-    await _checkSingleFileChanges(content, anything, allowErrors: true);
-  }
-
-  Future test_constructor_field_formal_unresolved() async {
-    var content = '''
-class C {
-  C(this.i);
-}
-''';
-    // It doesn't matter what the migration produces; we just want to make sure
-    // there isn't a crash.
-    await _checkSingleFileChanges(content, anything, allowErrors: true);
-  }
-
-  Future test_constructor_optional_param_factory() async {
-    var content = '''
-class C {
-  factory C([int x]) => C._();
-  C._([int x = 0]);
-}
-''';
-    var expected = '''
-class C {
-  factory C([int? x]) => C._();
-  C._([int x = 0]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_constructor_optional_param_factory_redirecting_named() async {
-    var content = '''
-class C {
-  factory C({int x}) = C._;
-  C._({int x = 0});
-}
-''';
-    var expected = '''
-class C {
-  factory C({int x}) = C._;
-  C._({int x = 0});
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_constructor_optional_param_factory_redirecting_unnamed() async {
-    var content = '''
-class C {
-  factory C([int x]) = C._;
-  C._([int x = 0]);
-}
-''';
-    var expected = '''
-class C {
-  factory C([int x]) = C._;
-  C._([int x = 0]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_constructor_optional_param_normal() async {
-    var content = '''
-class C {
-  C([int x]);
-}
-''';
-    var expected = '''
-class C {
-  C([int? x]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_constructor_optional_param_redirecting() async {
-    var content = '''
-class C {
-  C([int x]) : this._();
-  C._([int x = 0]);
-}
-''';
-    var expected = '''
-class C {
-  C([int? x]) : this._();
-  C._([int x = 0]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_constructorDeclaration_factory_non_null_return() async {
-    var content = '''
-class C {
-  C._();
-  factory C() {
-    C c = f();
-    return c;
-  }
-}
-C f() => null;
-''';
-    var expected = '''
-class C {
-  C._();
-  factory C() {
-    C c = f()!;
-    return c;
-  }
-}
-C? f() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_constructorDeclaration_factory_simple() async {
-    var content = '''
-class C {
-  C._();
-  factory C(int i) => C._();
-}
-main() {
-  C(null);
-}
-''';
-    var expected = '''
-class C {
-  C._();
-  factory C(int? i) => C._();
-}
-main() {
-  C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_constructorDeclaration_named() async {
-    var content = '''
-class C {
-  C.named(int i);
-}
-main() {
-  C.named(null);
-}
-''';
-    var expected = '''
-class C {
-  C.named(int? i);
-}
-main() {
-  C.named(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_constructorDeclaration_namedParameter() async {
-    var content = '''
-class C {
-  C({Key key});
-}
-class Key {}
-''';
-    var expected = '''
-class C {
-  C({Key? key});
-}
-class Key {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_convert_required() async {
-    addMetaPackage();
-    var content = '''
-import 'package:meta/meta.dart';
-void f({@required String s}) {}
-''';
-    var expected = '''
-import 'package:meta/meta.dart';
-void f({required String s}) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_custom_future() async {
-    var content = '''
-class CustomFuture implements Future {
-  @override
-  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
-}
-
-_f(CustomFuture> x) async => (await x).first;
-''';
-    var expected = '''
-class CustomFuture implements Future {
-  @override
-  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
-}
-
-_f(CustomFuture> x) async => (await x).first;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_assignment_field() async {
-    var content = '''
-class C {
-  int x = 0;
-}
-void f(C c) {
-  c.x = null;
-}
-''';
-    var expected = '''
-class C {
-  int? x = 0;
-}
-void f(C c) {
-  c.x = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_assignment_field_in_cascade() async {
-    var content = '''
-class C {
-  int x = 0;
-}
-void f(C c) {
-  c..x = null;
-}
-''';
-    var expected = '''
-class C {
-  int? x = 0;
-}
-void f(C c) {
-  c..x = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_assignment_local() async {
-    var content = '''
-void main() {
-  int i = 0;
-  i = null;
-}
-''';
-    var expected = '''
-void main() {
-  int? i = 0;
-  i = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_assignment_setter() async {
-    var content = '''
-class C {
-  void set s(int value) {}
-}
-void f(C c) {
-  c.s = null;
-}
-''';
-    var expected = '''
-class C {
-  void set s(int? value) {}
-}
-void f(C c) {
-  c.s = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_field_read() async {
-    var content = '''
-class C {
-  int/*?*/ f = 0;
-}
-int f(C c) => c.f;
-''';
-    var expected = '''
-class C {
-  int? f = 0;
-}
-int? f(C c) => c.f;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_function_return_type() async {
-    var content = '''
-int Function() _f(int Function() x) => x;
-int g() => null;
-main() {
-  _f(g);
-}
-''';
-    var expected = '''
-int? Function() _f(int? Function() x) => x;
-int? g() => null;
-main() {
-  _f(g);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_generic_contravariant_inward() async {
-    var content = '''
-class C {
-  void f(T t) {}
-}
-void g(C c, int i) {
-  c.f(i);
-}
-void test(C c) {
-  g(c, null);
-}
-''';
-
-    // Default behavior is to add nullability at the call site.  Rationale: this
-    // is correct in the common case where the generic parameter represents the
-    // type of an item in a container.  Also, if there are many callers that are
-    // largely independent, adding nullability to the callee would likely
-    // propagate to a field in the class, and thence (via return values of other
-    // methods) to most users of the class.  Whereas if we add nullability at
-    // the call site it's possible that other call sites won't need it.
-    var expected = '''
-class C {
-  void f(T t) {}
-}
-void g(C c, int? i) {
-  c.f(i);
-}
-void test(C c) {
-  g(c, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_generic_contravariant_inward_function() async {
-    var content = '''
-T f(T t) => t;
-int g(int x) => f(x);
-void h() {
-  g(null);
-}
-''';
-
-    // As with the generic class case (see
-    // [test_data_flow_generic_contravariant_inward_function]), we favor adding
-    // nullability at the call site, so that other uses of `f` don't necessarily
-    // see a nullable return value.
-    var expected = '''
-T f(T t) => t;
-int? g(int? x) => f(x);
-void h() {
-  g(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_data_flow_generic_contravariant_inward_using_core_class() async {
-    var content = '''
-void f(List x, int i) {
-  x.add(i);
-}
-void test(List x) {
-  f(x, null);
-}
-''';
-    var expected = '''
-void f(List x, int? i) {
-  x.add(i);
-}
-void test(List x) {
-  f(x, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_generic_covariant_outward() async {
-    var content = '''
-class C {
-  T getValue() => null;
-}
-int f(C x) => x.getValue();
-''';
-    var expected = '''
-class C {
-  T? getValue() => null;
-}
-int? f(C x) => x.getValue();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_generic_covariant_substituted() async {
-    var content = '''
-abstract class C {
-  T getValue();
-}
-int f(C x) => x.getValue();
-''';
-    var expected = '''
-abstract class C {
-  T getValue();
-}
-int? f(C x) => x.getValue();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_indexed_get_index_value() async {
-    var content = '''
-class C {
-  int operator[](int i) => 1;
-}
-int f(C c) => c[null];
-''';
-    var expected = '''
-class C {
-  int operator[](int? i) => 1;
-}
-int f(C c) => c[null];
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_indexed_get_value() async {
-    var content = '''
-class C {
-  int operator[](int i) => null;
-}
-int _f(C c) => c[0];
-''';
-    var expected = '''
-class C {
-  int? operator[](int? i) => null;
-}
-int? _f(C c) => c[0];
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): doesn't check anything, arguments are nullable by default.
-  Future test_data_flow_indexed_set_index_value() async {
-    var content = '''
-class C {
-  void operator[]=(int i, int j) {}
-}
-void _f(C c) {
-  c[null] = 0;
-}
-''';
-    var expected = '''
-class C {
-  void operator[]=(int? i, int? j) {}
-}
-void _f(C c) {
-  c[null] = 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): doesn't check anything, arguments are nullable by default.
-  Future test_data_flow_indexed_set_index_value_in_cascade() async {
-    var content = '''
-class C {
-  void operator[]=(int i, int j) {}
-}
-void _f(C c) {
-  c..[null] = 0;
-}
-''';
-    var expected = '''
-class C {
-  void operator[]=(int? i, int? j) {}
-}
-void _f(C c) {
-  c..[null] = 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): doesn't check anything, arguments are nullable by default.
-  Future test_data_flow_indexed_set_value() async {
-    var content = '''
-class C {
-  void operator[]=(int i, int j) {}
-}
-void _f(C c) {
-  c[0] = null;
-}
-''';
-    var expected = '''
-class C {
-  void operator[]=(int? i, int? j) {}
-}
-void _f(C c) {
-  c[0] = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_inward() async {
-    var content = '''
-int f(int i) => 0;
-int g(int i) => f(i);
-void test() {
-  g(null);
-}
-''';
-
-    var expected = '''
-int f(int? i) => 0;
-int g(int? i) => f(i);
-void test() {
-  g(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_inward_missing_type() async {
-    var content = '''
-int f(int i) => 0;
-int g(i) => f(i); // TODO(danrubel): suggest type
-void test() {
-  g(null);
-}
-''';
-
-    var expected = '''
-int f(int? i) => 0;
-int g(i) => f(i); // TODO(danrubel): suggest type
-void test() {
-  g(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_local_declaration() async {
-    var content = '''
-void f(int i) {
-  int j = i;
-}
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-void f(int? i) {
-  int? j = i;
-}
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_local_reference() async {
-    var content = '''
-void f(int i) {}
-void g(int i) {
-  int j = i;
-  f(i);
-}
-main() {
-  g(null);
-}
-''';
-    var expected = '''
-void f(int? i) {}
-void g(int? i) {
-  int? j = i;
-  f(i);
-}
-main() {
-  g(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_method_call_in_cascade() async {
-    var content = '''
-class C {
-  void m(int x) {}
-}
-void f(C c) {
-  c..m(null);
-}
-''';
-    var expected = '''
-class C {
-  void m(int? x) {}
-}
-void f(C c) {
-  c..m(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_outward() async {
-    var content = '''
-int _f(int i) => null;
-int _g(int i) => _f(i);
-''';
-
-    var expected = '''
-int? _f(int i) => null;
-int? _g(int i) => _f(i);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_data_flow_outward_missing_type() async {
-    var content = '''
-_f(int i) => null; // TODO(danrubel): suggest type
-int _g(int i) => _f(i);
-''';
-
-    var expected = '''
-_f(int i) => null; // TODO(danrubel): suggest type
-int? _g(int i) => _f(i);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_definitely_assigned_value() async {
-    var content = '''
-String f(bool b) {
-  String s;
-  if (b) {
-    s = 'true';
-  } else {
-    s = 'false';
-  }
-  return s;
-}
-''';
-    var expected = '''
-String f(bool b) {
-  String s;
-  if (b) {
-    s = 'true';
-  } else {
-    s = 'false';
-  }
-  return s;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): we don't discard anymore, remove?
-  Future test_discard_simple_condition_keep_else() async {
-    var content = '''
-int f(int i) {
-  if (i == null) {
-    return null;
-  } else {
-    return i + 1;
-  }
-}
-''';
-
-    var expected = '''
-int? f(int? i) {
-  if (i == null) {
-    return null;
-  } else {
-    return i + 1;
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  // TODO(yanok): we don't discard anymore, remove?
-  Future test_discard_simple_condition_keep_then() async {
-    var content = '''
-int f(int i) {
-  if (i != null) {
-    return i + 1;
-  } else {
-    return null;
-  }
-}
-''';
-
-    var expected = '''
-int? f(int? i) {
-  if (i != null) {
-    return i + 1;
-  } else {
-    return null;
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  Future test_do_not_add_question_to_null_type() async {
-    var content = '''
-Null f() => null;
-''';
-    var expected = '''
-Null f() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_do_not_propagate_non_null_intent_into_callback() async {
-    var content = '''
-void f(int/*!*/ Function(int) callback) {
-  callback(null);
-}
-int g(int x) => x;
-void test() {
-  f(g);
-}
-''';
-    // Even though `g` is passed to `f`'s `callback` parameter, non-null intent
-    // is not allowed to propagate backward from the return type of `callback`
-    // to the return type of `g`, because `g` might be used elsewhere in a
-    // context where it's important for its return type to be nullable.  So no
-    // null check is added to `g`, and instead a cast (which is guaranteed to
-    // fail) is added at the site of the call to `f`.
-    //
-    // Note: https://github.com/dart-lang/sdk/issues/40471 tracks the fact that
-    // we ought to alert the user to the presence of such casts.
-    var expected = '''
-void f(int Function(int?) callback) {
-  callback(null);
-}
-int? g(int? x) => x;
-void test() {
-  f(g as int Function(int?));
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_do_not_surround_named_expression() async {
-    var content = '''
-void f(int/*?*/ x, int/*?*/ y) {
-  g(named: [x, y]);
-}
-g({List/*!*/ named}) {}
-''';
-    var expected = '''
-void f(int? x, int? y) {
-  g(named: [x!, y!]);
-}
-g({required List named}) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_downcast_dynamic_function_to_functionType() async {
-    var content = '''
-void _f(Function a) {
-  int Function(String y) f1 = a;
-  Function b = null;
-  int Function(String y) f2 = b;
-}
-''';
-    // Don't assume any new nullabilities, but keep known nullabilities.
-    var expected = '''
-void _f(Function a) {
-  int Function(String y) f1 = a as int Function(String);
-  Function? b = null;
-  int Function(String y)? f2 = b as int Function(String)?;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_downcast_dynamic_to_functionType() async {
-    var content = '''
-void _f(dynamic a) {
-  int Function(String y) f1 = a;
-  dynamic b = null;
-  int Function(String y) f2 = b;
-}
-''';
-    // Don't assume any new nullabilities, but keep known nullabilities.
-    var expected = '''
-void _f(dynamic a) {
-  int Function(String y) f1 = a;
-  dynamic b = null;
-  int Function(String y)? f2 = b;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_downcast_dynamic_type_argument() async {
-    // This pattern is common and seems to have this as a best migration. It is
-    // less clear, but plausible, that this holds for other types of type
-    // parameter downcasts.
-    var content = '''
-List _f(List a) => a;
-void main() {
-  _f([null]);
-}
-''';
-
-    var expected = '''
-List _f(List a) => a as List;
-void main() {
-  _f([null]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @failingTest
-  Future test_downcast_not_widest_type_type_parameters() async {
-    // Fails because a hard assignment from List to List
-    // doesn't create a hard edge from 1 to 2. Perhaps this is correct. In this
-    // example it seems incorrect.
-    var content = '''
-void f(dynamic a) {
-  List hardToNonNullNonNull = a;
-  List hardToNullNonNull = a;
-  List hardToNonNullNull = a;
-  List/*!*/ nonNullNonNull;
-  List/*!*/ nullNonNull;
-  List/*?*/ nonNullNull;
-  nonNullNonNull = hardToNonNullNonNull
-  nonNullNull = hardToNonNullNull
-  nullNonNull = hardToNullNonNull
-}
-''';
-    var expected = '''
-void f(dynamic a) {
-  List hardToNonNullNonNull = a;
-  List hardToNullNonNull = a;
-  List? hardToNonNullNull = a;
-  List nonNullNonNull;
-  List nullNonNull;
-  List? nonNullNull;
-  nonNullNonNull = hardToNonNullNonNull
-  nonNullNull = hardToNonNullNull
-  nullNonNull = hardToNullNonNull
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_downcast_to_null() async {
-    // This probably doesn't arise too often for real-world code, since it is
-    // most likely a mistake.  Still, we want to make sure we don't crash and
-    // fail at compile-time instead.
-    var content = '''
-test() {
-  var x = List.filled(3, null);
-  x[0] = 1;
-}
-''';
-    var expected = '''
-test() {
-  var x = List.filled(3, null);
-  x[0] = 1;
-}
-''';
-    // Note: using allowErrors=true because passing `1` where `Null` is
-    // expected is an error.
-    await _checkSingleFileChanges(content, expected, allowErrors: true);
-  }
-
-  Future test_downcast_type_argument_preserve_nullability() async {
-    // There are no examples in front of us yet where anyone downcasts a type
-    // with a nullable type parameter. This is maybe correct, maybe not, and it
-    // unblocks us to find out which at a later point in time.
-    var content = '''
-List _f(Iterable a) => a;
-void main() {
-  _f([null]);
-}
-''';
-
-    var expected = '''
-List _f(Iterable a) => a as List;
-void main() {
-  _f([null]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @failingTest
-  Future test_downcast_widest_type_from_related_type_parameters() async {
-    var content = '''
-List f(Iterable a) => a;
-''';
-    var expected = '''
-List f(Iterable a) => a;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/39368')
-  Future test_downcast_widest_type_from_top_type_parameters() async {
-    var content = '''
-List f1(dynamic a) => a;
-List f2(Object b) => b;
-''';
-    // Note: even though the type `dynamic` permits `null`, the migration engine
-    // sees that there is no code path that could cause `f1` to be passed a null
-    // value, so it leaves its return type as non-nullable.
-    var expected = '''
-List f1(dynamic a) => a;
-List f2(Object b) => b;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @failingTest
-  Future
-      test_downcast_widest_type_from_unrelated_type_parameters() async {
-    var content = '''
-abstract class C implements List {}
-C f(List a) => a;
-''';
-    var expected = '''
-abstract class C implements List {}
-C f(List a) => a;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_dynamic_dispatch_to_object_method() async {
-    var content = '''
-String f(dynamic x) => x.toString();
-''';
-    var expected = '''
-String f(dynamic x) => x.toString();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_dynamic_method_call() async {
-    var content = '''
-class C {
-  int g(int i) => i;
-}
-int f(bool b, dynamic d) {
-  if (b) return 0;
-  return d.g(null);
-}
-main() {
-  f(true, null);
-  f(false, C());
-}
-''';
-    // TODO(yanok): this part is not tested anymore, since now g's argument
-    // is nullable by default.
-    // `d.g(null)` is a dynamic call, so we can't tell that it will target `C.g`
-    // at runtime.  So we can't figure out that we need to make g's argument and
-    // return types nullable.
-    //
-    // We do, however, make f's return type nullable, since there is no way of
-    // knowing whether a dynamic call will return `null`.
-    var expected = '''
-class C {
-  int? g(int? i) => i;
-}
-int? f(bool b, dynamic d) {
-  if (b) return 0;
-  return d.g(null);
-}
-main() {
-  f(true, null);
-  f(false, C());
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_dynamic_property_access() async {
-    var content = '''
-class C {
-  int get g => 0;
-}
-int f(bool b, dynamic d) {
-  if (b) return 0;
-  return d.g;
-}
-main() {
-  f(true, null);
-  f(false, C());
-}
-''';
-    var expected = '''
-class C {
-  int get g => 0;
-}
-int? f(bool b, dynamic d) {
-  if (b) return 0;
-  return d.g;
-}
-main() {
-  f(true, null);
-  f(false, C());
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_dynamic_toString() async {
-    var content = '''
-String f(dynamic x) => x.toString();
-''';
-    var expected = '''
-String f(dynamic x) => x.toString();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40174')
-  Future test_eliminate_dead_if_inside_for_element() async {
-    var content = '''
-List _f(List xs) => [for(var x in xs) if (x == null) 1];
-''';
-    var expected = '''
-List _f(List xs) => [];
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_enum() async {
-    var content = '''
-enum E {
-  value
-}
-
-E f() => E.value;
-int g() => f().index;
-
-void h() {
-  for(var value in E.values) {}
-  E.values.forEach((value) {});
-
-  f().toString();
-  f().runtimeType;
-  f().hashCode;
-  f().noSuchMethod(throw '');
-  f() == f();
-}
-''';
-    var expected = '''
-enum E {
-  value
-}
-
-E f() => E.value;
-int g() => f().index;
-
-void h() {
-  for(var value in E.values) {}
-  E.values.forEach((value) {});
-
-  f().toString();
-  f().runtimeType;
-  f().hashCode;
-  f().noSuchMethod(throw '');
-  f() == f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_exact_nullability_counterexample() async {
-    var content = '''
-void f(List x) {
-  x.add(1);
-}
-void g() {
-  f([null]);
-}
-void h(List x) {
-  f(x);
-}
-''';
-    // The `null` in `g` causes `f`'s `x` argument to have type `List`.
-    // Even though `f` calls a method that uses `List`'s type parameter
-    // contravariantly (the `add` method), that is not sufficient to cause exact
-    // nullability propagation, since value passed to `add` has a
-    // non-nullable type.  So nullability is *not* propagated back to `h`.
-    var expected = '''
-void f(List x) {
-  x.add(1);
-}
-void g() {
-  f([null]);
-}
-void h(List x) {
-  f(x);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_exact_nullability_doesnt_affect_function_args() async {
-    // Test attempting to create a bug from #40625. Currently passes, but if it
-    // breaks, that bug may need to be reopened.
-    var content = '''
-class C {
-  int Function(T) f;
-}
-void main(dynamic d) {
-  C c = d;
-  int Function(String) f1 = c.f; // should not have a nullable arg
-  c.f(null); // exact nullability induced here
-}
-''';
-    var expected = '''
-class C {
-  int Function(T)? f;
-}
-void main(dynamic d) {
-  C c = d;
-  int Function(String)? f1 = c.f; // should not have a nullable arg
-  c.f!(null); // exact nullability induced here
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_exact_nullability_doesnt_affect_function_returns() async {
-    // Test attempting to create a bug from #40625. Currently passes, but if it
-    // breaks, that bug may need to be reopened.
-    var content = '''
-class C {
-  T Function(String) f;
-}
-int Function(String) f1; // should not have a nullable return
-void main(dynamic d) {
-  C c = d;
-  c.f = f1;
-  c.f = (_) => null; // exact nullability induced here
-}
-''';
-    var expected = '''
-class C {
-  T Function(String)? f;
-}
-int Function(String)? f1; // should not have a nullable return
-void main(dynamic d) {
-  C c = d;
-  c.f = f1;
-  c.f = (_) => null; // exact nullability induced here
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_exact_nullability_doesnt_affect_typedef_args() async {
-    // Test attempting to create a bug from #40625. Currently passes, but if it
-    // breaks, that bug may need to be reopened.
-    var content = '''
-typedef F = int Function(T);
-F f1;
-
-void main() {
-  f1(null); // induce exact nullability
-  int Function(String) f2 = f1; // shouldn't have a nullable arg
-}
-''';
-    var expected = '''
-typedef F = int Function(T);
-F? f1;
-
-void main() {
-  f1!(null); // induce exact nullability
-  int Function(String)? f2 = f1; // shouldn't have a nullable arg
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_exact_nullability_doesnt_affect_typedef_returns() async {
-    // Test attempting to create a bug from #40625. Currently passes, but if it
-    // breaks, that bug may need to be reopened.
-    var content = '''
-typedef F = T Function(String);
-int Function(String) f1; // should not have a nullable return
-void main() {
-  F f2 = f1;
-  f2 = (_) => null; // exact nullability induced here
-}
-''';
-    var expected = '''
-typedef F = T Function(String);
-int Function(String)? f1; // should not have a nullable return
-void main() {
-  F? f2 = f1;
-  f2 = (_) => null; // exact nullability induced here
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/41409')
-  Future test_exact_nullability_in_nested_list() async {
-    var content = '''
-f(List y) {
-  var x = >[];
-  x.add(y);
-}
-''';
-    var expected = '''
-f(List y) {
-  var x = >[];
-  x.add(y);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_explicit_nullable_overrides_hard_edge() async {
-    var content = '''
-int f(int/*?*/ i) => i + 1;
-''';
-    var expected = '''
-int f(int? i) => i! + 1;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_expression_bang_hint() async {
-    var content = '''
-int f(int/*?*/ i) => i/*!*/;
-''';
-    var expected = '''
-int f(int? i) => i!;
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  Future test_expression_bang_hint_in_as() async {
-    var content = '''
-int f(num/*?*/ i) => i as int/*!*/;
-''';
-    var expected = '''
-int f(num? i) => i as int;
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/41788')
-  Future test_expression_bang_hint_in_as_wrapped() async {
-    var content = '''
-int f(num/*?*/ i) => (i as int)/*!*/;
-''';
-    var expected = '''
-int f(num? i) => (i as int?)!;
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  Future test_expression_bang_hint_unnecessary() async {
-    var content = '''
-int/*?*/ f(int/*?*/ i) => i/*!*/;
-''';
-    // The user requested a null check so we should add it even if it's not
-    // required to avoid compile errors.
-    var expected = '''
-int? f(int? i) => i!;
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  Future test_expression_bang_hint_unnecessary_literal() async {
-    var content = 'int/*?*/ f() => 1/*!*/;';
-    // The user requested a null check so we should add it even if it's not
-    // required to avoid compile errors.
-    var expected = 'int? f() => 1!;';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  Future test_expression_bang_hint_with_cast() async {
-    var content = 'int f(Object/*?*/ o) => o/*!*/;';
-    var expected = 'int f(Object? o) => o! as int;';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_expression_nullable_cast_then_checked() async {
-    var content = '''
-int/*!*/ f(num/*?*/ i) => (i as int);
-''';
-    var expected = '''
-int f(num? i) => (i as int);
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/41788')
-  Future test_expression_wrapped_with_null_check_and_null_intent() async {
-    var content = '''
-int/*!*/ f(int/*?*/ i) => (i)/*!*/;
-''';
-    var expected = '''
-int f(int? i) => i!;
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  Future test_extension_complex() async {
-    var content = '''
-import 'already_migrated.dart';
-class D extends C {}
-abstract class Foo {
-  D> get z;
-  List test() => z.x ?? [];
-}
-''';
-    var alreadyMigrated = '''
-// @dart=2.12
-extension E on C {
-  T? get x => y;
-}
-class C {
-  U? y;
-}
-''';
-    var expected = '''
-import 'already_migrated.dart';
-class D extends C {}
-abstract class Foo {
-  D> get z;
-  List test() => z.x ?? [];
-}
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/already_migrated.dart': alreadyMigrated
-    });
-  }
-
-  Future test_extension_extended_type_nullability_intent() async {
-    var content = '''
-extension E on C {
-  String foo() => this.bar();
-}
-
-class C {
-  String bar() => null;
-}
-
-void test(C c, bool b) {
-  if (b) {
-    c.foo();
-  }
-}
-
-main() {
-  test(null, false);
-}
-''';
-    // The call to `bar` from `foo` should be taken as a demonstration that the
-    // extension E is not intended to apply to nullable types, so the call to
-    // `foo` should be null checked.
-    var expected = '''
-extension E on C {
-  String? foo() => this.bar();
-}
-
-class C {
-  String? bar() => null;
-}
-
-void test(C? c, bool b) {
-  if (b) {
-    c!.foo();
-  }
-}
-
-main() {
-  test(null, false);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_null_check_non_nullable_binary() async {
-    var content = '''
-class C {}
-extension E on C/*!*/ {
-  void operator+(int other) {}
-}
-void f(C c, bool b) {
-  if (b) {
-    c + 0;
-  }
-}
-void g() => f(null, false);
-''';
-    var expected = '''
-class C {}
-extension E on C {
-  void operator+(int? other) {}
-}
-void f(C? c, bool b) {
-  if (b) {
-    c! + 0;
-  }
-}
-void g() => f(null, false);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_null_check_non_nullable_generic() async {
-    var content = '''
-class C {}
-extension E on T/*!*/ {
-  void m() {}
-}
-void f(C c, bool b) {
-  if (b) {
-    c.m();
-  }
-}
-void g() => f(null, false);
-''';
-    var expected = '''
-class C {}
-extension E on T {
-  void m() {}
-}
-void f(C? c, bool b) {
-  if (b) {
-    c!.m();
-  }
-}
-void g() => f(null, false);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_null_check_non_nullable_index() async {
-    var content = '''
-class C {}
-extension E on C/*!*/ {
-  void operator[](int index) {}
-}
-void f(C c, bool b) {
-  if (b) {
-    c[0];
-  }
-}
-void g() => f(null, false);
-''';
-    var expected = '''
-class C {}
-extension E on C {
-  void operator[](int? index) {}
-}
-void f(C? c, bool b) {
-  if (b) {
-    c![0];
-  }
-}
-void g() => f(null, false);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_null_check_non_nullable_method() async {
-    var content = '''
-class C {}
-extension E on C/*!*/ {
-  void m() {}
-}
-void f(C c, bool b) {
-  if (b) {
-    c.m();
-  }
-}
-void g() => f(null, false);
-''';
-    var expected = '''
-class C {}
-extension E on C {
-  void m() {}
-}
-void f(C? c, bool b) {
-  if (b) {
-    c!.m();
-  }
-}
-void g() => f(null, false);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_null_check_non_nullable_prefix() async {
-    var content = '''
-class C {}
-extension E on C/*!*/ {
-  void operator-() {}
-}
-void f(C c, bool b) {
-  if (b) {
-    -c;
-  }
-}
-void g() => f(null, false);
-''';
-    var expected = '''
-class C {}
-extension E on C {
-  void operator-() {}
-}
-void f(C? c, bool b) {
-  if (b) {
-    -c!;
-  }
-}
-void g() => f(null, false);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_null_check_nullable() async {
-    var content = '''
-class C {}
-extension E on C/*?*/ {
-  void m() {}
-}
-void f(C c, bool b) {
-  if (b) {
-    c.m();
-  }
-}
-void g() => f(null, false);
-''';
-    var expected = '''
-class C {}
-extension E on C? {
-  void m() {}
-}
-void f(C? c, bool b) {
-  if (b) {
-    c.m();
-  }
-}
-void g() => f(null, false);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_null_check_nullable_generic() async {
-    var content = '''
-class C {}
-extension E on T/*!*/ {
-  void m() {}
-}
-void f(C c, bool b) {
-  if (b) {
-    c.m();
-  }
-}
-void g() => f(null, false);
-''';
-    var expected = '''
-class C {}
-extension E on T {
-  void m() {}
-}
-void f(C? c, bool b) {
-  if (b) {
-    c.m();
-  }
-}
-void g() => f(null, false);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_null_check_target() async {
-    var content = '''
-extension E on int/*!*/ {
-  int get plusOne => this + 1;
-}
-int f(int/*?*/ x) => x.plusOne;
-''';
-    var expected = '''
-extension E on int {
-  int get plusOne => this + 1;
-}
-int f(int? x) => x!.plusOne;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_nullable_target() async {
-    var content = '''
-extension E on int {
-  int get one => 1;
-}
-int f(int/*?*/ x) => x.one;
-''';
-    var expected = '''
-extension E on int? {
-  int get one => 1;
-}
-int f(int? x) => x.one;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_nullableOnType_addsNullCheckToThis() async {
-    var content = '''
-extension E on String /*?*/ {
-  void m() => this.length;
-}
-''';
-    var expected = '''
-extension E on String? {
-  void m() => this!.length;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_nullableOnType_typeArgument() async {
-    var content = '''
-extension E on List {
-  void m() {}
-}
-void _f(List list) => list.m();
-void g() => _f([null]);
-''';
-    var expected = '''
-extension E on List {
-  void m() {}
-}
-void _f(List list) => list.m();
-void g() => _f([null]);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40023')
-  Future test_extension_nullableOnType_typeVariable() async {
-    var content = '''
-extension E on List {
-  void m() {}
-}
-void f(List list) => list.m();
-void g() => f([null]);
-''';
-    var expected = '''
-extension E on List {
-  void m() {}
-}
-void f(List list) => list.m();
-void g() => f([null]);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_nullableOnType_viaExplicitInvocation() async {
-    var content = '''
-class C {}
-extension E on C {
-  void m() {}
-}
-void f() => E(null).m();
-''';
-    var expected = '''
-class C {}
-extension E on C? {
-  void m() {}
-}
-void f() => E(null).m();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_nullableOnType_viaImplicitInvocation() async {
-    var content = '''
-class C {}
-extension E on C {
-  void m() {}
-}
-void f(C c) => c.m();
-void g() => f(null);
-''';
-    var expected = '''
-class C {}
-extension E on C? {
-  void m() {}
-}
-void f(C? c) => c.m();
-void g() => f(null);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_on_generic_type() async {
-    var content = '''
-class C {
-  final T value;
-  C(this.value);
-}
-extension E on Future> {
-  Future get asyncValue async => (await this).value;
-}
-''';
-    var expected = '''
-class C {
-  final T value;
-  C(this.value);
-}
-extension E on Future> {
-  Future get asyncValue async => (await this).value;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_on_type_param_implementation() async {
-    var content = '''
-abstract class C {
-  C _clone();
-}
-extension Cloner on T {
-  T clone() => _clone() as T;
-}
-''';
-    var expected = '''
-abstract class C {
-  C _clone();
-}
-extension Cloner on T {
-  T clone() => _clone() as T;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_on_type_param_usage() async {
-    var content = '''
-abstract class C {
-  C _clone();
-}
-extension Cloner on T {
-  T clone() => throw Exception();
-}
-C _f(C c) => c.clone();
-''';
-    var expected = '''
-abstract class C {
-  C _clone();
-}
-extension Cloner on T {
-  T clone() => throw Exception();
-}
-C _f(C c) => c.clone();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_on_type_substitution() async {
-    var content = '''
-extension E on T {
-  T get foo => this;
-}
-List _f(List x) => x.foo;
-''';
-    // To see that the return type of `f` must be `List`) into
-    // the extension's "on" type.
-    var expected = '''
-extension E on T {
-  T get foo => this;
-}
-List _f(List x) => x.foo;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_override() async {
-    var content = '''
-extension E on int {
-  int get plusOne => this + 1;
-}
-int _f(int x) => E(x).plusOne;
-''';
-    var expected = '''
-extension E on int {
-  int get plusOne => this + 1;
-}
-int _f(int x) => E(x).plusOne;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_override_null_check_target() async {
-    var content = '''
-extension E on int/*!*/ {
-  int get plusOne => this + 1;
-}
-int f(int/*?*/ x) => E(x).plusOne;
-''';
-    var expected = '''
-extension E on int {
-  int get plusOne => this + 1;
-}
-int f(int? x) => E(x!).plusOne;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_override_nullable_result_type() async {
-    var content = '''
-extension E on int {
-  int get nullValue => null;
-}
-int _f(int x) => E(x).nullValue;
-''';
-    var expected = '''
-extension E on int {
-  int? get nullValue => null;
-}
-int? _f(int x) => E(x).nullValue;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_override_nullable_target() async {
-    var content = '''
-extension E on int {
-  int get one => 1;
-}
-int f(int/*?*/ x) => E(x).one;
-''';
-    var expected = '''
-extension E on int? {
-  int get one => 1;
-}
-int f(int? x) => E(x).one;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_extension_use_can_imply_non_null_intent() async {
-    var content = '''
-extension E on T/*!*/ {
-  void foo() {}
-}
-f(int i) {
-  i.foo();
-}
-g(bool b, int/*?*/ j) {
-  if (b) {
-    f(j);
-  }
-}
-''';
-    // Since the extension declaration says `T extends Object/*!*/`, `i` will
-    // not be made nullable.
-    var expected = '''
-extension E on T {
-  void foo() {}
-}
-f(int i) {
-  i.foo();
-}
-g(bool b, int? j) {
-  if (b) {
-    f(j!);
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_external_constructor() async {
-    var content = '''
-class C {
-  external C(dynamic Function(dynamic) callback);
-  static Object g(Object Function(Object) callback) => C(callback);
-}
-''';
-    var expected = '''
-class C {
-  external C(dynamic Function(dynamic)? callback);
-  static Object g(Object Function(Object?)? callback) => C(callback);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_external_function() async {
-    var content = '''
-external dynamic f();
-Object g() => f();
-''';
-    var expected = '''
-external dynamic f();
-Object? g() => f();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_external_function_implicit_return() async {
-    var content = '''
-external f();
-Object g() => f();
-''';
-    var expected = '''
-external f();
-Object? g() => f();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_external_function_implicit_variance() async {
-    var content = '''
-external void f(callback(x));
-void g(Object Function(Object) callback) => f(callback);
-''';
-    var expected = '''
-external void f(callback(x)?);
-void g(Object Function(Object?)? callback) => f(callback);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_external_function_implicit_variance_complex() async {
-    var content = '''
-external void f(callback(x()));
-void g(Object Function(Object Function()) callback) => f(callback);
-''';
-    var expected = '''
-external void f(callback(x())?);
-void g(Object Function(Object? Function())? callback) => f(callback);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_external_function_variance() async {
-    var content = '''
-external void f(dynamic Function(dynamic) callback);
-void g(Object Function(Object) callback) => f(callback);
-''';
-    var expected = '''
-external void f(dynamic Function(dynamic)? callback);
-void g(Object Function(Object?)? callback) => f(callback);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_external_method() async {
-    var content = '''
-class C {
-  external dynamic f();
-  Object g() => f();
-}
-''';
-    var expected = '''
-class C {
-  external dynamic f();
-  Object? g() => f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_external_method_implicit() async {
-    var content = '''
-class C {
-  external f();
-  Object g() => f();
-}
-''';
-    var expected = '''
-class C {
-  external f();
-  Object? g() => f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_final_uninitialized_used() async {
-    var content = '''
-class C {
-  final String s;
-
-  f() {
-    g(s);
-  }
-}
-g(String /*!*/ s) {}
-''';
-    var expected = '''
-class C {
-  late final String s;
-
-  f() {
-    g(s);
-  }
-}
-g(String s) {}
-''';
-    // Note: using allowErrors=true because an uninitialized field is an error
-    await _checkSingleFileChanges(content, expected, allowErrors: true);
-  }
-
-  Future test_field_formal_param_typed() async {
-    var content = '''
-class C {
-  int i;
-  C(int this.i);
-}
-main() {
-  C(null);
-}
-''';
-    var expected = '''
-class C {
-  int? i;
-  C(int? this.i);
-}
-main() {
-  C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_formal_param_typed_non_nullable() async {
-    var content = '''
-class C {
-  int/*!*/ i;
-  C(int this.i);
-}
-void f(int i, bool b) {
-  if (b) {
-    C(i);
-  }
-}
-main() {
-  f(null, false);
-}
-''';
-    var expected = '''
-class C {
-  int i;
-  C(int this.i);
-}
-void f(int? i, bool b) {
-  if (b) {
-    C(i!);
-  }
-}
-main() {
-  f(null, false);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_formal_param_untyped() async {
-    var content = '''
-class C {
-  int i;
-  C(this.i);
-}
-main() {
-  C(null);
-}
-''';
-    var expected = '''
-class C {
-  int? i;
-  C(this.i);
-}
-main() {
-  C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_formal_parameters_do_not_promote() async {
-    var content = '''
-class A {}
-
-class B extends A {}
-
-class C extends A {}
-
-abstract class D {
-  final A x;
-  D(this.x) {
-    if (x is B) {
-      visitB(x);
-    } else {
-      visitC(x as C);
-    }
-  }
-
-  void visitB(B b);
-
-  void visitC(C c);
-}
-''';
-    var expected = '''
-class A {}
-
-class B extends A {}
-
-class C extends A {}
-
-abstract class D {
-  final A x;
-  D(this.x) {
-    if (x is B) {
-      visitB(x as B);
-    } else {
-      visitC(x as C);
-    }
-  }
-
-  void visitB(B? b);
-
-  void visitC(C? c);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_initialized_at_declaration_site() async {
-    var content = '''
-class C {
-  int i = 0;
-  C();
-}
-''';
-    var expected = '''
-class C {
-  int i = 0;
-  C();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_field_initialized_at_declaration_site_no_constructor() async {
-    var content = '''
-class C {
-  int i = 0;
-}
-''';
-    var expected = '''
-class C {
-  int i = 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_initialized_in_constructor() async {
-    var content = '''
-class C {
-  int i;
-  C() : i = 0;
-}
-''';
-    var expected = '''
-class C {
-  int i;
-  C() : i = 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_field_initialized_in_constructor_with_factories_and_redirects() async {
-    var content = '''
-class C {
-  int i;
-  C() : i = 0;
-  factory C.factoryConstructor() => C();
-  factory C.factoryRedirect() = D;
-  C.redirect() : this();
-}
-class D extends C {}
-''';
-    var expected = '''
-class C {
-  int i;
-  C() : i = 0;
-  factory C.factoryConstructor() => C();
-  factory C.factoryRedirect() = D;
-  C.redirect() : this();
-}
-class D extends C {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_initializer_simple() async {
-    var content = '''
-class C {
-  int f;
-  C(int i) : f = i;
-}
-main() {
-  C(null);
-}
-''';
-    var expected = '''
-class C {
-  int? f;
-  C(int? i) : f = i;
-}
-main() {
-  C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_initializer_typed_list_literal() async {
-    var content = '''
-class C {
-  List f;
-  C() : f = [null];
-}
-''';
-    var expected = '''
-class C {
-  List f;
-  C() : f = [null];
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_initializer_untyped_list_literal() async {
-    var content = '''
-class C {
-  List f;
-  C() : f = [null];
-}
-''';
-    var expected = '''
-class C {
-  List f;
-  C() : f = [null];
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_initializer_untyped_map_literal() async {
-    var content = '''
-class C {
-  Map f;
-  C() : f = {"foo": null};
-}
-''';
-    var expected = '''
-class C {
-  Map f;
-  C() : f = {"foo": null};
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_initializer_untyped_set_literal() async {
-    var content = '''
-class C {
-  Set f;
-  C() : f = {null};
-}
-''';
-    var expected = '''
-class C {
-  Set f;
-  C() : f = {null};
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_not_initialized() async {
-    var content = '''
-class C {
-  int i;
-  C();
-}
-''';
-    var expected = '''
-class C {
-  int? i;
-  C();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_not_initialized_no_constructor() async {
-    var content = '''
-class C {
-  int i;
-}
-''';
-    var expected = '''
-class C {
-  int? i;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_overrides_field_in_mixin() async {
-    var content = '''
-class C extends Object with M {
-  int x;
-}
-
-mixin M {
-  int x;
-}
-''';
-    var expected = '''
-class C extends Object with M {
-  int? x;
-}
-
-mixin M {
-  int? x;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_overrides_getter() async {
-    var content = '''
-abstract class C {
-  int get i;
-}
-class D implements C {
-  @override
-  final int i;
-  D._() : i = computeI();
-}
-int computeI() => null;
-''';
-    var expected = '''
-abstract class C {
-  int? get i;
-}
-class D implements C {
-  @override
-  final int? i;
-  D._() : i = computeI();
-}
-int? computeI() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_type_inferred() async {
-    var content = '''
-int f() => null;
-class C {
-  var x = 1;
-  void g() {
-    x = f();
-  }
-}
-''';
-    // The type of x is inferred as non-nullable from its initializer, but we
-    // try to assign a nullable value to it.  So an explicit type must be added.
-    var expected = '''
-int? f() => null;
-class C {
-  int? x = 1;
-  void g() {
-    x = f();
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_uninitialized_used() async {
-    var content = '''
-class C {
-  String s;
-
-  f() {
-    g(s);
-  }
-}
-g(String /*!*/ s) {}
-''';
-    var expected = '''
-class C {
-  late String s;
-
-  f() {
-    g(s);
-  }
-}
-g(String s) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_field_uninitialized_used_hint() async {
-    var content = '''
-class C {
-  String /*?*/ s;
-
-  f() {
-    g(s);
-  }
-}
-g(String /*!*/ s) {}
-''';
-    var expected = '''
-class C {
-  String? s;
-
-  f() {
-    g(s!);
-  }
-}
-g(String s) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_firstWhere_complex_target() async {
-    // See https://github.com/dart-lang/sdk/issues/43956
-    var content = '''
-Iterable allMatches(String str) => 'x'.allMatches(str);
-
-Match matchAsPrefix(String str, [int start = 0]) {
-  return allMatches(str)
-      .firstWhere((match) => match.start == start, orElse: () => null);
-}
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-Iterable allMatches(String str) => 'x'.allMatches(str);
-
-Match? matchAsPrefix(String str, [int start = 0]) {
-  return allMatches(str)
-      .firstWhereOrNull((match) => match.start == start);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_firstWhere_non_nullable() async {
-    var content = '''
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? firstEven(Iterable x)
-    => x.firstWhereOrNull((x) => x.isEven);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_firstWhere_non_nullable_with_cast() async {
-    var content = '''
-int firstNonZero(Iterable x)
-    => x.firstWhere((x) => x != 0, orElse: () => null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? firstNonZero(Iterable x)
-    => x.firstWhereOrNull((x) => x != 0) as int?;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_firstWhere_non_nullable_with_non_null_assertion() async {
-    var content = '''
-int/*!*/ firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int firstEven(Iterable x)
-    => x.firstWhereOrNull((x) => x.isEven)!;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_firstWhere_nullable() async {
-    var content = '''
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-f() => firstEven([null]);
-''';
-    var expected = '''
-int? firstEven(Iterable x)
-    => x.firstWhere((x) => x!.isEven, orElse: () => null);
-f() => firstEven([null]);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_firstWhere_nullable_with_cast() async {
-    var content = '''
-int firstNonZero(Iterable x)
-    => x.firstWhere((x) => x != 0, orElse: () => null);
-f() => firstNonZero([null]);
-''';
-    var expected = '''
-int? firstNonZero(Iterable x)
-    => x.firstWhere((x) => x != 0, orElse: () => null) as int?;
-f() => firstNonZero([null]);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_flow_analysis_complex() async {
-    var content = '''
-int f(int x) {
-  while (x == null) {
-    x = g(x);
-  }
-  return x;
-}
-int g(int x) => x == null ? 1 : null;
-main() {
-  f(null);
-}
-''';
-    // Flow analysis can tell that the loop only exits if x is non-null, so the
-    // return type of `f` can remain `int`, and no null check is needed.
-    var expected = '''
-int f(int? x) {
-  while (x == null) {
-    x = g(x);
-  }
-  return x;
-}
-int? g(int? x) => x == null ? 1 : null;
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_flow_analysis_simple() async {
-    var content = '''
-int f(int x) {
-  if (x == null) {
-    return 0;
-  } else {
-    return x;
-  }
-}
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-int f(int? x) {
-  if (x == null) {
-    return 0;
-  } else {
-    return x;
-  }
-}
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_for_each_basic() async {
-    var content = '''
-void f(List l) {
-  for (var x in l) {
-    g(x);
-  }
-}
-void g(int x) {}
-main() {
-  f([null]);
-}
-''';
-    var expected = '''
-void f(List l) {
-  for (var x in l) {
-    g(x);
-  }
-}
-void g(int? x) {}
-main() {
-  f([null]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_for_each_variable_initialized() async {
-    var content = '''
-int sum(List list) {
-  int total = 0;
-  for (var i in list) {
-    total = total + i;
-  }
-  return total;
-}
-''';
-    var expected = '''
-int sum(List list) {
-  int total = 0;
-  for (var i in list) {
-    total = total + i;
-  }
-  return total;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_expression() async {
-    var content = '''
-int f(int i) {
-  var g = (int j) => i;
-  return g(i);
-}
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-int? f(int? i) {
-  var g = (int? j) => i;
-  return g(i);
-}
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_expression_invocation() async {
-    var content = '''
-abstract class C {
-  void Function(int) f();
-  int/*?*/ Function() g();
-}
-int test(C c) {
-  c.f()(null);
-  return c.g()();
-}
-''';
-    var expected = '''
-abstract class C {
-  void Function(int?) f();
-  int? Function() g();
-}
-int? test(C c) {
-  c.f()(null);
-  return c.g()();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_expression_invocation_via_getter() async {
-    var content = '''
-abstract class C {
-  void Function(int) get f;
-  int/*?*/ Function() get g;
-}
-int test(C c) {
-  c.f(null);
-  return c.g();
-}
-''';
-    var expected = '''
-abstract class C {
-  void Function(int?) get f;
-  int? Function() get g;
-}
-int? test(C c) {
-  c.f(null);
-  return c.g();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_expression_never() async {
-    var content = '''
-typedef CB = int Function(Object o);
-abstract class C {
-  void m(CB cb);
-}
-void f(C c) {
-  c.m((_) => throw Exception());
-}
-''';
-    var expected = '''
-typedef CB = int Function(Object o);
-abstract class C {
-  void m(CB? cb);
-}
-void f(C c) {
-  c.m((_) => throw Exception());
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_expression_return() async {
-    var content = '''
-void test({String foo}) async {
-  var f = () {
-    return "hello";
-  };
-
-  foo.length;
-}
-''';
-    var expected = '''
-void test({required String foo}) async {
-  var f = () {
-    return "hello";
-  };
-
-  foo.length;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_typed_field_formal_param() async {
-    var content = '''
-class C {
-  void Function(int) f;
-  C(void this.f(int i));
-}
-main() {
-  C(null);
-}
-''';
-    var expected = '''
-class C {
-  void Function(int)? f;
-  C(void this.f(int i)?);
-}
-main() {
-  C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_typed_field_formal_param_accepts_hint() async {
-    var content = '''
-class C {
-  void Function(int) f;
-  C(void this.f(int i) /*?*/);
-}
-''';
-    var expected = '''
-class C {
-  void Function(int)? f;
-  C(void this.f(int i)?);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_typed_field_formal_param_inner_types() async {
-    var content = '''
-class C {
-  int Function(int) f;
-  C(int this.f(int i));
-}
-int g(int i) => i;
-int test(int i) => C(g).f(i);
-main() {
-  test(null);
-}
-''';
-    var expected = '''
-class C {
-  int? Function(int?) f;
-  C(int? this.f(int? i));
-}
-int? g(int? i) => i;
-int? test(int? i) => C(g).f(i);
-main() {
-  test(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_typed_formal_param() async {
-    var content = '''
-void f(g()) {}
-void main() {
-  f(null);
-}
-''';
-    var expected = '''
-void f(g()?) {}
-void main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_typed_formal_param_accepts_hint() async {
-    var content = '''
-void f(g() /*?*/) {}
-''';
-    var expected = '''
-void f(g()?) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_function_typed_formal_param_inner_types() async {
-    var content = '''
-int f(int callback(int i), int j) => callback(j);
-int g(int i) => i;
-int test(int i) => f(g, i);
-main() {
-  test(null);
-}
-''';
-    var expected = '''
-int? f(int? callback(int? i), int? j) => callback(j);
-int? g(int? i) => i;
-int? test(int? i) => f(g, i);
-main() {
-  test(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_future_nullability_mismatch() async {
-    var content = '''
-String foo;
-
-Future getNullableFoo() async {
-  return foo;
-}
-
-Future getFoo() {
-  return getNullableFoo();
-}
-''';
-    var expected = '''
-String? foo;
-
-Future getNullableFoo() async {
-  return foo;
-}
-
-Future getFoo() {
-  return getNullableFoo().then((value) => value!);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): the cast of `foi2` looks wrong, I think it should be `int?`
-  // instead, but `DOWN(int?, FutureOr)` is `int` according to the spec.
-  Future test_future_or_t_downcast_to_t() async {
-    var content = '''
-import 'dart:async';
-void _f(
-    FutureOr foi1,
-    FutureOr foi2,
-    FutureOr/*?*/ foi3,
-    FutureOr/*?*/ foi4
-) {
-  int i1 = foi1;
-  int i2 = foi2;
-  int i3 = foi3;
-  int i4 = foi4;
-}
-''';
-    var expected = '''
-import 'dart:async';
-void _f(
-    FutureOr foi1,
-    FutureOr foi2,
-    FutureOr? foi3,
-    FutureOr foi4
-) {
-  int i1 = foi1 as int;
-  int? i2 = foi2 as int;
-  int? i3 = foi3 as int?;
-  int? i4 = foi4 as int?;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_future_type_mismatch() async {
-    var content = '''
-Future> getNullableInts() async {
-  return [null];
-}
-
-Future> getInts() {
-  return getNullableInts();
-}
-''';
-    // TODO(paulberry): this is not a good migration.  Really we should produce
-    // `getNullableInts().then((value) => value.cast());`.
-    var expected = '''
-Future> getNullableInts() async {
-  return [null];
-}
-
-Future> getInts() {
-  return getNullableInts().then((value) => value as List);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_generic_bound() async {
-    var content = '''
-abstract class C {
-  void f();
-}
-void f(C s, C> i) {
-  s.f();
-  i.f>();
-}
-''';
-    var expected = '''
-abstract class C {
-  void f();
-}
-void f(C s, C> i) {
-  s.f();
-  i.f>();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_generic_exact_propagation() async {
-    var content = '''
-class C {
-  List values;
-  C() : values = [];
-  void add(T t) => values.add(t);
-  T operator[](int i) => values[i];
-}
-void f() {
-  C x = new C();
-  g(x);
-}
-void g(C y) {
-  y.add(null);
-}
-''';
-    var expected = '''
-class C {
-  List values;
-  C() : values = [];
-  void add(T t) => values.add(t);
-  T operator[](int i) => values[i];
-}
-void f() {
-  C x = new C();
-  g(x);
-}
-void g(C y) {
-  y.add(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_generic_exact_propagation_premigratedListClass() async {
-    var content = '''
-void f() {
-  List x = new List.empty();
-  g(x);
-}
-void g(List y) {
-  y.add(null);
-}
-''';
-    var expected = '''
-void f() {
-  List x = new List.empty();
-  g(x);
-}
-void g(List y) {
-  y.add(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_generic_function_type_syntax_inferred_dynamic_return() async {
-    var content = '''
-abstract class C {
-  Function() f();
-}
-Object g(C c) => c.f()();
-''';
-    // Note: even though the type `dynamic` permits `null`, the migration engine
-    // sees that there is no code path that could cause `g` to return a null
-    // value, so it leaves its return type as `Object`, and there is an implicit
-    // downcast.
-    var expected = '''
-abstract class C {
-  Function() f();
-}
-Object g(C c) => c.f()();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): this is the case I don't like. One would hope that usage
-  // in test would force comparison to be non-nullable.
-  Future
-      test_generic_typedef_respects_explicit_nullability_of_type_arg() async {
-    var content = '''
-class C {
-  final Comparator comparison;
-  C(int Function(int, int) comparison) : comparison = comparison;
-  void test() {
-    comparison(f(), f());
-  }
-}
-int f() => null;
-''';
-    var expected = '''
-class C {
-  final Comparator? comparison;
-  C(int Function(int, int)? comparison) : comparison = comparison;
-  void test() {
-    comparison!(f()!, f()!);
-  }
-}
-int? f() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_genericType_noTypeArguments() async {
-    var content = '''
-void _f(C c) {}
-class C {}
-''';
-    var expected = '''
-void _f(C c) {}
-class C {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/39404')
-  Future test_genericType_noTypeArguments_use_bound() async {
-    var content = '''
-abstract class C { // (1)
-  void put(T t);
-  T get();
-}
-Object f(C c) => c.get();            // (2)
-void g(C c) {                   // (3)
-  c.put(null);                       // (4)
-}
-''';
-    // (4) forces `...C...` at (3), which means (1) must be
-    // `...extends Object?`.  Therefore (2) is equivalent to
-    // `...f(C c)...`, so the return type of `f` is `Object?`.
-    var expected = '''
-abstract class C { // (1)
-  void put(T t);
-  T get();
-}
-Object? f(C c) => c.get();            // (2)
-void g(C c) {                   // (3)
-  c.put(null);                       // (4)
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_getter_implicit_returnType_overrides_implicit_getter() async {
-    var content = '''
-class A {
-  final String s = "x";
-}
-class C implements A {
-  get s => false ? "y" : null;
-}
-''';
-    var expected = '''
-class A {
-  final String? s = "x";
-}
-class C implements A {
-  get s => false ? "y" : null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_overrides_implicit_getter() async {
-    var content = '''
-class A {
-  final String s = "x";
-}
-class C implements A {
-  String get s => false ? "y" : null;
-}
-''';
-    var expected = '''
-class A {
-  final String? s = "x";
-}
-class C implements A {
-  String? get s => false ? "y" : null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_overrides_implicit_getter_with_generics() async {
-    var content = '''
-class A {
-  final T value;
-  A(this.value);
-}
-class C implements A {
-  String get value => false ? "y" : null;
-}
-''';
-    var expected = '''
-class A {
-  final T? value;
-  A(this.value);
-}
-class C implements A {
-  String? get value => false ? "y" : null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_getter_in_interface() async {
-    var content = '''
-class B {
-  int get x => null;
-}
-abstract class C implements B {
-  void set x(int value) {}
-}
-''';
-    var expected = '''
-class B {
-  int? get x => null;
-}
-abstract class C implements B {
-  void set x(int? value) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_getter_in_interface_field() async {
-    var content = '''
-class B {
-  final int x = null;
-}
-abstract class C implements B {
-  void set x(int value) {}
-}
-''';
-    var expected = '''
-class B {
-  final int? x = null;
-}
-abstract class C implements B {
-  void set x(int? value) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_getter_in_interfaces() async {
-    var content = '''
-class B1 {
-  int get x => null;
-}
-class B2 {
-  int get x => null;
-}
-abstract class C implements B1, B2 {
-  void set x(int value) {}
-}
-''';
-    var expected = '''
-class B1 {
-  int? get x => null;
-}
-class B2 {
-  int? get x => null;
-}
-abstract class C implements B1, B2 {
-  void set x(int? value) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_getter_in_superclass() async {
-    var content = '''
-class B {
-  int get x => null;
-}
-class C extends B {
-  void set x(int value) {}
-}
-''';
-    var expected = '''
-class B {
-  int? get x => null;
-}
-class C extends B {
-  void set x(int? value) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_getter_in_superclass_substituted() async {
-    var content = '''
-class B {
-  T get x => throw '';
-}
-class C extends B> {
-  void set x(List value) {}
-}
-''';
-    var expected = '''
-class B {
-  T get x => throw '';
-}
-class C extends B> {
-  void set x(List value) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_setter_in_interface() async {
-    var content = '''
-class B {
-  void set x(int value) {}
-}
-abstract class C implements B {
-  int get x => null;
-}
-''';
-    var expected = '''
-class B {
-  void set x(int? value) {}
-}
-abstract class C implements B {
-  int? get x => null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_setter_in_interface_field() async {
-    var content = '''
-class B {
-  int x;
-  B(this.x);
-}
-abstract class C implements B {
-  int get x => null;
-}
-''';
-    var expected = '''
-class B {
-  int? x;
-  B(this.x);
-}
-abstract class C implements B {
-  int? get x => null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_setter_in_interfaces() async {
-    var content = '''
-class B1 {
-  void set x(int value) {}
-}
-class B2 {
-  void set x(int value) {}
-}
-abstract class C implements B1, B2 {
-  int get x => null;
-}
-''';
-    var expected = '''
-class B1 {
-  void set x(int? value) {}
-}
-class B2 {
-  void set x(int? value) {}
-}
-abstract class C implements B1, B2 {
-  int? get x => null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_setter_in_superclass() async {
-    var content = '''
-class B {
-  void set x(int value) {}
-}
-class C extends B {
-  int get x => null;
-}
-''';
-    var expected = '''
-class B {
-  void set x(int? value) {}
-}
-class C extends B {
-  int? get x => null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_setter_in_superclass_substituted() async {
-    var content = '''
-class B {
-  void set x(T value) {}
-}
-class C extends B> {
-  List get x => [null];
-}
-''';
-    var expected = '''
-class B {
-  void set x(T value) {}
-}
-class C extends B> {
-  List get x => [null];
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_single_class() async {
-    var content = '''
-class C {
-  int get x => null;
-  void set x(int value) {}
-}
-''';
-    var expected = '''
-class C {
-  int? get x => null;
-  void set x(int? value) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_single_class_generic() async {
-    var content = '''
-class C {
-  T get x => null;
-  void set x(T value) {}
-}
-''';
-    var expected = '''
-class C {
-  T? get x => null;
-  void set x(T? value) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_static() async {
-    var content = '''
-class C {
-  static int get x => null;
-  static void set x(int value) {}
-}
-''';
-    var expected = '''
-class C {
-  static int? get x => null;
-  static void set x(int? value) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_setter_top_level() async {
-    var content = '''
-int get x => null;
-void set x(int value) {}
-''';
-    var expected = '''
-int? get x => null;
-void set x(int? value) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_getter_topLevel() async {
-    var content = '''
-int get g => 0;
-''';
-    var expected = '''
-int get g => 0;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_hint_contradicts_exact_nullability() async {
-    var content = '''
-void f(List x) {
-  x.add(null);
-}
-void g() {
-  f([]);
-}
-''';
-    // `f.x` needs to change to List to allow `null` to be added to the
-    // list.  Ordinarily this would be propagated back to the explicit list in
-    // `g`, but we don't override the hint `/*!*/`.
-    //
-    // TODO(paulberry): we should probably issue some sort of warning to the
-    // user instead.
-    var expected = '''
-void f(List x) {
-  x.add(null);
-}
-void g() {
-  f([]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_ifStatement_nullCheck_noElse() async {
-    var content = '''
-int f(int x) {
-  if (x == null) return 0;
-  return x;
-}
-''';
-    var expected = '''
-int f(int? x) {
-  if (x == null) return 0;
-  return x;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_implicit_parameter_type_override_does_not_union() async {
-    var content = '''
-abstract class A {
-  void f(int/*?*/ i);
-}
-abstract class B {
-  void f(int/*!*/ i);
-}
-class C implements A, B {
-  void f(i) {}
-}
-''';
-    // Even though the parameter type of C.f is implicit, its nullability
-    // shouldn't be unioned with that of A and B, because that would
-    // unnecessarily force B.f's parameter type to be nullable.
-    var expected = '''
-abstract class A {
-  void f(int? i);
-}
-abstract class B {
-  void f(int i);
-}
-class C implements A, B {
-  void f(i) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_implicit_return_type_override_does_not_union() async {
-    var content = '''
-abstract class A {
-  int/*?*/ f();
-}
-abstract class B {
-  int f();
-}
-class C implements A, B {
-  f() => 0;
-}
-''';
-    // Even though the return type of C.f is implicit, its nullability shouldn't
-    // be unioned with that of A and B, because that would unnecessarily force
-    // B.f's return type to be nullable.
-    var expected = '''
-abstract class A {
-  int? f();
-}
-abstract class B {
-  int f();
-}
-class C implements A, B {
-  f() => 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_implicit_tearoff_type_arguments() async {
-    var content = '''
-T f(T t) => t;
-int Function(int) g() => f;
-''';
-    var expected = '''
-T f(T t) => t;
-int Function(int) g() => f;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_implicit_type_parameter_bound_nullable() async {
-    var content = '''
-class C {
-  f(T t) {
-    Object o = t;
-  }
-}
-''';
-    var expected = '''
-class C {
-  f(T t) {
-    Object? o = t;
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_infer_late_with_cascaded_usage() async {
-    var content = '''
-class A {
-  B b;
-}
-class B {
-  void f() {}
-  void g() {}
-}
-foo(A a) {
-  a.b..f()..g();
-}
-bar(A a) {
-  a.b = B();
-}
-''';
-    var expected = '''
-class A {
-  late B b;
-}
-class B {
-  void f() {}
-  void g() {}
-}
-foo(A a) {
-  a.b..f()..g();
-}
-bar(A a) {
-  a.b = B();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/39376')
-  Future test_infer_required() async {
-    var content = '''
-void _f(bool b, {int x}) {
-  if (b) {
-    print(x + 1);
-  }
-}
-main() {
-  _f(true, x: 1);
-}
-''';
-    var expected = '''
-void _f(bool b, {required int x}) {
-  if (b) {
-    print(x + 1);
-  }
-}
-main() {
-  _f(true, x: 1);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_inferred_method_return_type_non_nullable() async {
-    var content = '''
-class B {
-  int f() => 1;
-}
-class C extends B {
-  f() => 1;
-}
-int g(C c) => c.f();
-''';
-    // B.f's return type is `int`.  Since C.f's return type is inferred from
-    // B.f's, it has a return type of `int` too.  Therefore g's return type
-    // must be `int`.
-    var expected = '''
-class B {
-  int f() => 1;
-}
-class C extends B {
-  f() => 1;
-}
-int g(C c) => c.f();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_insert_as_prefixed_type() async {
-    var content = '''
-import 'dart:async' as a;
-Future _f(Object o) => o;
-''';
-    var expected = '''
-import 'dart:async' as a;
-Future _f(Object o) => o as a.Future;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40871')
-  Future test_insert_type_with_prefix() async {
-    var content = '''
-import 'dart:async' as a;
-a.Future f(Object o) {
-  return o;
-}
-''';
-    var expected = '''
-import 'dart:async' as a;
-a.Future f(Object o) {
-  return o as a.Future;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/38469')
-  Future test_inserted_nodes_properly_wrapped() async {
-    addMetaPackage();
-    var content = '''
-class C {
-  C operator+(C other) => null;
-}
-void f(C x, C y) {
-  C z = x + y;
-  assert(z != null);
-}
-''';
-    var expected = '''
-class C {
-  C operator+(C other) => null;
-}
-void f(C x, C y) {
-  C z = (x + y)!;
-  assert(z != null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_instance_creation_generic() async {
-    var content = '''
-class C {
-  C(T t);
-}
-main() {
-  C c = C(null);
-}
-''';
-    var expected = '''
-class C {
-  C(T t);
-}
-main() {
-  C c = C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_instance_creation_generic_explicit_nonNullable() async {
-    var content = '''
-class C {
-  C(T/*!*/ t);
-}
-test(int/*?*/ n) {
-  C c = C(n);
-}
-''';
-    var expected = '''
-class C {
-  C(T t);
-}
-test(int? n) {
-  C c = C(n!);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_instance_creation_generic_explicit_nonNullableParam() async {
-    var content = '''
-class C {
-  C(T/*!*/ t);
-}
-main() {
-  C c = C(null);
-}
-''';
-    var expected = '''
-class C {
-  C(T t);
-}
-main() {
-  C c = C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_instance_creation_generic_implicit_nonNullable() async {
-    var content = '''
-class C {
-  C(T/*!*/ t);
-}
-test(int/*?*/ n) {
-  C c = C(n);
-}
-''';
-    var expected = '''
-class C {
-  C(T t);
-}
-test(int? n) {
-  C c = C(n!);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_instance_creation_generic_implicit_nonNullableParam() async {
-    var content = '''
-class C {
-  C(T/*!*/ t);
-}
-main() {
-  C c = C(null);
-}
-''';
-    var expected = '''
-class C {
-  C(T t);
-}
-main() {
-  C c = C(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_instanceCreation_noTypeArguments_noParameters() async {
-    var content = '''
-void main() {
-  C c = C();
-  c.length;
-}
-class C {
-  int get length => 0;
-}
-''';
-    var expected = '''
-void main() {
-  C c = C();
-  c.length;
-}
-class C {
-  int get length => 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_int_double_coercion() async {
-    var content = '''
-double f() => 0;
-''';
-    var expected = '''
-double f() => 0;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_is_promotion_implies_non_nullable() async {
-    var content = '''
-bool f(Object o) => o is int && o.isEven;
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-bool f(Object? o) => o is int && o.isEven;
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_is_promotion_implies_non_nullable_generic() async {
-    var content = '''
-int f(T o) => o is List ? o.length : 0;
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-int f(T o) => o is List ? o.length : 0;
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_isExpression_typeName_typeArguments() async {
-    var content = '''
-bool f(a) => a is List;
-''';
-    var expected = '''
-bool f(a) => a is List;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_isExpression_with_function_type() async {
-    var content = '''
-void _test(Function f) {
-  if (f is void Function()) {
-    f();
-  }
-}
-''';
-    var expected = '''
-void _test(Function f) {
-  if (f is void Function()) {
-    f();
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_issue_40181() async {
-    // This contrived example created an "exact nullable" type parameter bound
-    // which propagated back to *all* instantiations of that parameter.
-    var content = '''
-class B {
-  B([C t]);
-}
-
-abstract class C {
-  void f(T t);
-}
-
-class E {
-  final C _base;
-  E([C base]) : _base = base;
-  f(Object t) {
-    _base.f(t);
-  }
-}
-
-void main() {
-  E e = E();
-  e.f(null);
-}
-''';
-    var expected = '''
-class B {
-  B([C? t]);
-}
-
-abstract class C {
-  void f(T t);
-}
-
-class E {
-  final C? _base;
-  E([C? base]) : _base = base;
-  f(Object? t) {
-    _base!.f(t);
-  }
-}
-
-void main() {
-  E e = E();
-  e.f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_issue_41397() async {
-    var content = '''
-void repro(){
-  List l = [];
-  for(final dynamic e in l) {
-    final List a = (e['query'] as String).split('&');
-  }
-}
-''';
-    var expected = '''
-void repro(){
-  List l = [];
-  for(final dynamic e in l) {
-    final List a = (e['query'] as String).split('&');
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_lastWhere_non_nullable() async {
-    var content = '''
-int lastEven(Iterable x)
-    => x.lastWhere((x) => x.isEven, orElse: () => null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? lastEven(Iterable x)
-    => x.lastWhereOrNull((x) => x.isEven);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_lastWhere_nullable() async {
-    var content = '''
-int lastEven(Iterable x)
-    => x.lastWhere((x) => x.isEven, orElse: () => null);
-f() => lastEven([null]);
-''';
-    var expected = '''
-int? lastEven(Iterable x)
-    => x.lastWhere((x) => x!.isEven, orElse: () => null);
-f() => lastEven([null]);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_final_hint_instance_field_without_constructor() async {
-    var content = '''
-class C {
-  /*late final*/ int x;
-  f() {
-    x = 1;
-  }
-  int g() => x;
-}
-''';
-    var expected = '''
-class C {
-  late final int x;
-  f() {
-    x = 1;
-  }
-  int g() => x;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_final_hint_local_variable() async {
-    var content = '''
-int f(bool b1, bool b2) {
-  /*late final*/ int x;
-  if (b1) {
-    x = 1;
-  }
-  if (b2) {
-    return x;
-  }
-  return 0;
-}
-''';
-    var expected = '''
-int f(bool b1, bool b2) {
-  late final int x;
-  if (b1) {
-    x = 1;
-  }
-  if (b2) {
-    return x;
-  }
-  return 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_final_hint_top_level_var() async {
-    var content = '''
-/*late final*/ int x;
-f() {
-  x = 1;
-}
-int g() => x;
-''';
-    var expected = '''
-late final int x;
-f() {
-  x = 1;
-}
-int g() => x;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_hint_followed_by_underscore() async {
-    var content = '''
-class _C {}
-/*late*/ _C c;
-''';
-    var expected = '''
-class _C {}
-late _C c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_hint_instance_field_with_constructor() async {
-    var content = '''
-class C {
-  C();
-  /*late*/ int x;
-  f() {
-    x = 1;
-  }
-  int g() => x;
-}
-''';
-    var expected = '''
-class C {
-  C();
-  late int x;
-  f() {
-    x = 1;
-  }
-  int g() => x;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_hint_instance_field_without_constructor() async {
-    var content = '''
-class C {
-  /*late*/ int x;
-  f() {
-    x = 1;
-  }
-  int g() => x;
-}
-''';
-    var expected = '''
-class C {
-  late int x;
-  f() {
-    x = 1;
-  }
-  int g() => x;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_hint_local_variable() async {
-    var content = '''
-int f(bool b1, bool b2) {
-  /*late*/ int x;
-  if (b1) {
-    x = 1;
-  }
-  if (b2) {
-    return x;
-  }
-  return 0;
-}
-''';
-    var expected = '''
-int f(bool b1, bool b2) {
-  late int x;
-  if (b1) {
-    x = 1;
-  }
-  if (b2) {
-    return x;
-  }
-  return 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_hint_static_field() async {
-    var content = '''
-class C {
-  static /*late*/ int x;
-  f() {
-    x = 1;
-  }
-  int g() => x;
-}
-''';
-    var expected = '''
-class C {
-  static late int x;
-  f() {
-    x = 1;
-  }
-  int g() => x;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_late_hint_top_level_var() async {
-    var content = '''
-/*late*/ int x;
-f() {
-  x = 1;
-}
-int g() => x;
-''';
-    var expected = '''
-late int x;
-f() {
-  x = 1;
-}
-int g() => x;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_leave_downcast_from_dynamic_implicit() async {
-    var content = 'int _f(dynamic n) => n;';
-    var expected = 'int _f(dynamic n) => n;';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_libraryWithParts() async {
-    var root = '$projectPath/lib';
-    var path1 = convertPath('$root/lib.dart');
-    var file1 = '''
-part 'src/foo/part.dart';
-''';
-    var expected1 = '''
-part 'src/foo/part.dart';
-''';
-    var path2 = convertPath('$root/src/foo/part.dart');
-    var file2 = '''
-part of '../../lib.dart';
-class C {
-  static void m(C c) {}
-}
-''';
-    var expected2 = '''
-part of '../../lib.dart';
-class C {
-  static void m(C? c) {}
-}
-''';
-    await _checkMultipleFileChanges(
-        {path2: file2, path1: file1}, {path1: expected1, path2: expected2});
-  }
-
-  Future test_libraryWithParts_add_questions() async {
-    var root = '$projectPath/lib';
-    var path1 = convertPath('$root/lib.dart');
-    var file1 = '''
-part 'src/foo/part.dart';
-
-int f() => null;
-''';
-    var expected1 = '''
-part 'src/foo/part.dart';
-
-int? f() => null;
-''';
-    var path2 = convertPath('$root/src/foo/part.dart');
-    var file2 = '''
-part of '../../lib.dart';
-
-int g() => null;
-''';
-    var expected2 = '''
-part of '../../lib.dart';
-
-int? g() => null;
-''';
-    await _checkMultipleFileChanges(
-        {path2: file2, path1: file1}, {path1: expected1, path2: expected2});
-  }
-
-  Future test_list_conditional_element() async {
-    var content = '''
-void _bar(List l) {}
-
-void _test({String foo}) {
-    _bar([if (foo != null) foo]);
-}
-''';
-    var expected = '''
-void _bar(List l) {}
-
-void _test({String? foo}) {
-    _bar([if (foo != null) foo]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_literal_null_without_valid_migration() async {
-    var content = '''
-void f(int/*!*/ x) {}
-void g() {
-  f(null);
-}
-''';
-    var expected = '''
-void f(int x) {}
-void g() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_literals_maintain_nullability() async {
-    // See #40590. Without exact nullability, this would migrate to
-    // `List list = [1, 2]`. While the function of exact nullability
-    // may change, this case should continue to work.
-    var content = r'''
-void f() {
-  List list = [1, 2];
-  list.add(null);
-  Set set_ = {1, 2};
-  set_.add(null);
-  Map map = {1: 2};
-  map[null] = null;
-}
-''';
-    var expected = r'''
-void f() {
-  List list = [1, 2];
-  list.add(null);
-  Set set_ = {1, 2};
-  set_.add(null);
-  Map map = {1: 2};
-  map[null] = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_loadLibrary_call() async {
-    var testPath = convertPath('$testsPath/lib/test.dart');
-    var otherPath = convertPath('$testsPath/lib/other.dart');
-    var content = {
-      testPath: '''
-import 'other.dart' deferred as other;
-Future f() => other.loadLibrary();
-''',
-      otherPath: ''
-    };
-    var expected = {
-      testPath: '''
-import 'other.dart' deferred as other;
-Future f() => other.loadLibrary();
-''',
-      otherPath: ''
-    };
-    await _checkMultipleFileChanges(content, expected);
-  }
-
-  Future test_loadLibrary_tearOff() async {
-    var testPath = convertPath('$testsPath/lib/test.dart');
-    var otherPath = convertPath('$testsPath/lib/other.dart');
-    var content = {
-      testPath: '''
-import 'other.dart' deferred as other;
-Future Function() f() => other.loadLibrary;
-''',
-      otherPath: ''
-    };
-    var expected = {
-      testPath: '''
-import 'other.dart' deferred as other;
-Future Function() f() => other.loadLibrary;
-''',
-      otherPath: ''
-    };
-    await _checkMultipleFileChanges(content, expected);
-  }
-
-  Future test_local_function() async {
-    var content = '''
-int f(int i) {
-  int g(int j) => i;
-  return g(i);
-}
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-int? f(int? i) {
-  int? g(int? j) => i;
-  return g(i);
-}
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_local_function_doesnt_assign() async {
-    var content = '''
-int f() {
-  int i;
-  g(int j) {
-    i = 1;
-  };
-  ((int j) {
-    i = 1;
-  });
-  return i + 1;
-}
-''';
-    var expected = '''
-int f() {
-  late int i;
-  g(int j) {
-    i = 1;
-  };
-  ((int j) {
-    i = 1;
-  });
-  return i + 1;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_local_function_expression_inhibits_non_null_intent() async {
-    var content = '''
-void call(void Function() callback) {
-  callback();
-}
-test(int i, int j) {
-  call(() {
-    i = j;
-  });
-  print(i + 1);
-}
-main() {
-  test(null, 0);
-}
-''';
-    // `print(i + 1)` does *not* demonstrate non-null intent for `i` because it
-    // is write captured by the local function expression, so it's not
-    // guaranteed that a null value of `i` on entry to the function will lead to
-    // an exception.
-    var expected = '''
-void call(void Function() callback) {
-  callback();
-}
-test(int? i, int? j) {
-  call(() {
-    i = j;
-  });
-  print(i! + 1);
-}
-main() {
-  test(null, 0);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_local_function_inhibits_non_null_intent() async {
-    var content = '''
-void call(void Function() callback) {
-  callback();
-}
-test(int i, int j) {
-  void f() {
-    i = j;
-  }
-  call(f);
-  print(i + 1);
-}
-main() {
-  test(null, 0);
-}
-''';
-    // `print(i + 1)` does *not* demonstrate non-null intent for `i` because it
-    // is write captured by the local function expression, so it's not
-    // guaranteed that a null value of `i` on entry to the function will lead to
-    // an exception.
-    var expected = '''
-void call(void Function() callback) {
-  callback();
-}
-test(int? i, int? j) {
-  void f() {
-    i = j;
-  }
-  call(f);
-  print(i! + 1);
-}
-main() {
-  test(null, 0);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_local_function_return() async {
-    var content = '''
-void test({String foo}) async {
-  String f() {
-    return "hello";
-  }
-
-  foo.length;
-}
-''';
-    var expected = '''
-void test({required String foo}) async {
-  String f() {
-    return "hello";
-  }
-
-  foo.length;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_localVariable_type_inferred() async {
-    var content = '''
-int f() => null;
-void main() {
-  var x = 1;
-  x = f();
-}
-''';
-    // The type of x is inferred as non-nullable from its initializer, but we
-    // try to assign a nullable value to it.  So an explicit type must be added.
-    var expected = '''
-int? f() => null;
-void main() {
-  int? x = 1;
-  x = f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_localVariable_uninitialized_assigned_non_nullable() async {
-    var content = '''
-f() {
-  String s;
-  if (1 == 2) s = g();
-  h(s);
-}
-String /*!*/ g() => "Hello";
-h(String /*!*/ s) {}
-''';
-    var expected = '''
-f() {
-  late String s;
-  if (1 == 2) s = g();
-  h(s);
-}
-String g() => "Hello";
-h(String s) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_localVariable_uninitialized_used() async {
-    var content = '''
-f() {
-  String s;
-  if (1 == 2) s = "Hello";
-  g(s);
-}
-g(String /*!*/ s) {}
-''';
-    var expected = '''
-f() {
-  late String s;
-  if (1 == 2) s = "Hello";
-  g(s);
-}
-g(String s) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_localVariable_uninitialized_usedInComparison() async {
-    var content = '''
-f() {
-  String s;
-  if (s == null) {}
-}
-''';
-    var expected = '''
-f() {
-  String? s;
-  if (s == null) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_localVariable_uninitialized_usedInExpressionStatement() async {
-    var content = '''
-f() {
-  String s;
-  s;
-}
-''';
-    var expected = '''
-f() {
-  String? s;
-  s;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_localVariable_uninitialized_usedInForUpdaters() async {
-    var content = '''
-f() {
-  String s;
-  for (s;;) {}
-}
-''';
-    var expected = '''
-f() {
-  String? s;
-  for (s;;) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_localVariable_uninitialized_usedInForVariable() async {
-    var content = '''
-f() {
-  String s;
-  for (;; s) {}
-}
-''';
-    var expected = '''
-f() {
-  String? s;
-  for (;; s) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_loop_var_is_field() async {
-    var content = '''
-class C {
-  int x;
-  C(this.x);
-  f(List y) {
-    for (x in y) {}
-  }
-}
-''';
-    var expected = '''
-class C {
-  int? x;
-  C(this.x);
-  f(List y) {
-    for (x in y) {}
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_loop_var_is_inherited_field_with_substitution() async {
-    var content = '''
-class B {
-  T x;
-  B(this.x);
-}
-abstract class C implements B {
-  f(List y) {
-    for (x in y) {}
-  }
-}
-''';
-    var expected = '''
-class B {
-  T x;
-  B(this.x);
-}
-abstract class C implements B {
-  f(List y) {
-    for (x in y) {}
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_make_downcast_explicit() async {
-    var content = 'int f(num/*!*/ n) => n;';
-    var expected = 'int f(num n) => n as int;';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_many_type_variables() async {
-    try {
-      assert(false);
-    } catch (_) {
-      // When assertions are enabled, this test fails, so skip it.
-      // See https://github.com/dart-lang/sdk/issues/43945.
-      return;
-    }
-    var content = '''
-void test(C x, double Function(C) y) {
-  x.f(y);
-}
-class C {
-  U f(U Function(C) z) => throw 'foo';
-}
-''';
-    var expected = '''
-void test(C x, double Function(C)? y) {
-  x.f(y);
-}
-class C {
-  U f(U Function(C)? z) => throw 'foo';
-}
-''';
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future test_map_nullable_input() async {
-    var content = '''
-Iterable f(List x) => x.map((y) => g(y));
-int g(int x) => x + 1;
-main() {
-  f([null]);
-}
-''';
-    var expected = '''
-Iterable f(List x) => x.map((y) => g(y!));
-int g(int x) => x + 1;
-main() {
-  f([null]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_map_nullable_input_tearoff() async {
-    var content = '''
-Iterable f(List x) => x.map(g);
-int g(int x) => x + 1;
-main() {
-  f([null]);
-}
-''';
-    var expected = '''
-Iterable f(List x) => x.map(g);
-int g(int? x) => x! + 1;
-main() {
-  f([null]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_map_nullable_output() async {
-    var content = '''
-Iterable _f(List x) => x.map((y) => _g(y));
-int _g(int x) => null;
-main() {
-  _f([1]);
-}
-''';
-    var expected = '''
-Iterable _f(List x) => x.map((y) => _g(y));
-int? _g(int x) => null;
-main() {
-  _f([1]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_map_read_does_not_require_index_cast() async {
-    var content = '''
-int _f(Map m, Object o) => m[o];
-''';
-    var expected = '''
-int? _f(Map m, Object o) => m[o];
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_map_write_requires_index_cast() async {
-    var content = '''
-void _f(Map m, Object o, int i) => m[o] = i;
-''';
-    var expected = '''
-void _f(Map m, Object o, int i) => m[o as String] = i;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_methodInvocation_extension_invocation() async {
-    var content = '''
-extension on bool {
-  void f() {}
-}
-bool g(T x) => true;
-void main() {
-  g(null).f();
-}
-''';
-    var expected = '''
-extension on bool {
-  void f() {}
-}
-bool g(T x) => true;
-void main() {
-  g(null).f();
-}
-''';
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future test_methodInvocation_typeArguments_explicit() async {
-    var content = '''
-T f(T t) => t;
-void g() {
-  int x = f(null);
-}
-''';
-    var expected = '''
-T f(T t) => t;
-void g() {
-  int? x = f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_methodInvocation_typeArguments_explicit_nonNullable() async {
-    var content = '''
-T f(T/*!*/ t) => t;
-void g(int/*?*/ n) {
-  int x = f(n);
-}
-''';
-    var expected = '''
-T f(T t) => t;
-void g(int? n) {
-  int x = f(n!);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_methodInvocation_typeArguments_explicit_nonNullableParam() async {
-    var content = '''
-T f(T/*!*/ t) => t;
-void g() {
-  int x = f(null);
-}
-''';
-    var expected = '''
-T f(T t) => t;
-void g() {
-  int? x = f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_methodInvocation_typeArguments_inferred() async {
-    var content = '''
-T f(T t) => t;
-void g() {
-  int x = f(null);
-}
-''';
-    var expected = '''
-T f(T t) => t;
-void g() {
-  int? x = f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_methodInvocation_typeArguments_inferred_nonNullable() async {
-    var content = '''
-T f(T/*!*/ t) => t;
-void g(int/*?*/ n) {
-  int x = f(n);
-}
-''';
-    var expected = '''
-T f(T t) => t;
-void g(int? n) {
-  int x = f(n!);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_methodInvocation_typeArguments_inferred_nonNullableParam() async {
-    var content = '''
-T f(T/*!*/ t) => t;
-void g() {
-  int x = f(null);
-}
-''';
-    var expected = '''
-T f(T t) => t;
-void g() {
-  int? x = f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_migrate_reference_to_never() async {
-    var content = '''
-import 'dart:io';
-int f() =>
-  exit(1); // this returns `Never` which used to cause a crash.
-''';
-    var expected = '''
-import 'dart:io';
-int f() =>
-  exit(1); // this returns `Never` which used to cause a crash.
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_migratedMethod_namedParameter() async {
-    var content = '''
-void f(Iterable a) {
-  a.toList(growable: false);
-}
-''';
-    var expected = '''
-void f(Iterable a) {
-  a.toList(growable: false);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_multiDeclaration_innerUsage() async {
-    var content = '''
-void test() {
-  // here non-null is OK.
-  int i1 = 0, i2 = i1.gcd(2);
-  // here non-null is not OK.
-  int i3 = 0, i4 = i3.gcd(2), i5 = null;
-}
-''';
-    var expected = '''
-void test() {
-  // here non-null is OK.
-  int i1 = 0, i2 = i1.gcd(2);
-  // here non-null is not OK.
-  int? i3 = 0, i4 = i3.gcd(2), i5 = null;
-}
-''';
-
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_multiDeclaration_softEdges() async {
-    var content = '''
-int _nullable(int i1, int i2) {
-  int i3 = i1, i4 = i2;
-  return i3;
-}
-int _nonNull(int i1, int i2) {
-  int i3 = i1, i4 = i2;
-  return i3;
-}
-int _both(int i1, int i2) {
-  int i3 = i1, i4 = i2;
-  return i3;
-}
-void main() {
-  _nullable(null, null);
-  _nonNull(0, 1);
-  _both(0, null);
-}
-''';
-    var expected = '''
-int? _nullable(int? i1, int? i2) {
-  int? i3 = i1, i4 = i2;
-  return i3;
-}
-int _nonNull(int i1, int i2) {
-  int i3 = i1, i4 = i2;
-  return i3;
-}
-int? _both(int i1, int? i2) {
-  int? i3 = i1, i4 = i2;
-  return i3;
-}
-void main() {
-  _nullable(null, null);
-  _nonNull(0, 1);
-  _both(0, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_add_required() async {
-    var content = '''
-void f({String s}) {
-  assert(s != null);
-}
-''';
-    var expected = '''
-void f({required String s}) {
-  assert(s != null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_add_required_function_typed() async {
-    var content = '''
-void f({void g(int i)}) {
-  assert(g != null);
-}
-''';
-    var expected = '''
-void f({required void g(int i)}) {
-  assert(g != null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_no_default_unused() async {
-    var content = '''
-void f({String s}) {}
-main() {
-  f();
-}
-''';
-    var expected = '''
-void f({String? s}) {}
-main() {
-  f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_no_default_unused_propagate() async {
-    var content = '''
-void f(String s) {}
-void g({String s}) {
-  f(s);
-}
-main() {
-  g();
-}
-''';
-    var expected = '''
-void f(String? s) {}
-void g({String? s}) {
-  f(s);
-}
-main() {
-  g();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_no_default_unused_required() async {
-    // The `@required` annotation overrides the assumption of nullability.
-    // The call at `f()` is presumed to be in error.
-    addMetaPackage();
-    var content = '''
-import 'package:meta/meta.dart';
-void f({@required String s}) {}
-main() {
-  f();
-}
-''';
-    var expected = '''
-import 'package:meta/meta.dart';
-void f({required String s}) {}
-main() {
-  f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_no_default_used_non_null() async {
-    var content = '''
-void f({String s}) {}
-main() {
-  f(s: 'x');
-}
-''';
-    var expected = '''
-void f({String? s}) {}
-main() {
-  f(s: 'x');
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_no_default_used_non_null_propagate() async {
-    var content = '''
-void f(String s) {}
-void g({String s}) {
-  f(s);
-}
-main() {
-  g(s: 'x');
-}
-''';
-    var expected = '''
-void f(String? s) {}
-void g({String? s}) {
-  f(s);
-}
-main() {
-  g(s: 'x');
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_no_default_used_null_option2() async {
-    var content = '''
-void f({String s}) {}
-main() {
-  f(s: null);
-}
-''';
-    var expected = '''
-void f({String? s}) {}
-main() {
-  f(s: null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_no_default_used_null_required() async {
-    // Explicitly passing `null` forces the parameter to be nullable even though
-    // it is required.
-    addMetaPackage();
-    var content = '''
-import 'package:meta/meta.dart';
-void f({@required String s}) {}
-main() {
-  f(s: null);
-}
-''';
-    var expected = '''
-import 'package:meta/meta.dart';
-void f({required String? s}) {}
-main() {
-  f(s: null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_named_parameter_with_non_null_default_unused_option2() async {
-    var content = '''
-void f({String s: 'foo'}) {}
-main() {
-  f();
-}
-''';
-    var expected = '''
-void f({String s: 'foo'}) {}
-main() {
-  f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_named_parameter_with_non_null_default_used_non_null_option2() async {
-    var content = '''
-void f({String s: 'foo'}) {}
-main() {
-  f(s: 'bar');
-}
-''';
-    var expected = '''
-void f({String s: 'foo'}) {}
-main() {
-  f(s: 'bar');
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_named_parameter_with_non_null_default_used_null_option2() async {
-    var content = '''
-void f({String s: 'foo'}) {}
-main() {
-  f(s: null);
-}
-''';
-    var expected = '''
-void f({String? s: 'foo'}) {}
-main() {
-  f(s: null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_named_parameter_with_null_default_unused_option2() async {
-    var content = '''
-void f({String s: null}) {}
-main() {
-  f();
-}
-''';
-    var expected = '''
-void f({String? s: null}) {}
-main() {
-  f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_non_null_assertion() async {
-    var content = '''
-int _f(int i, [int j]) {
-  if (i == 0) return i;
-  return i + j;
-}
-''';
-
-    var expected = '''
-int _f(int i, [int? j]) {
-  if (i == 0) return i;
-  return i + j!;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_non_null_intent_field_formal_assert() async {
-    var content = '''
-class C {
-  int i;
-  C(this.i) {
-    assert(i != null);
-  }
-}
-f(int j, bool b) {
-  if (b) {
-    C(j);
-  }
-}
-g() {
-  f(null, false);
-}
-''';
-    var expected = '''
-class C {
-  int i;
-  C(this.i) {
-    assert(i != null);
-  }
-}
-f(int? j, bool b) {
-  if (b) {
-    C(j!);
-  }
-}
-g() {
-  f(null, false);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_non_null_intent_field_formal_use() async {
-    var content = '''
-class C {
-  int i;
-  C(this.i) {
-    f(i);
-  }
-}
-f(int j) {
-  assert(j != null);
-}
-g(int k, bool b) {
-  if (b) {
-    C(k);
-  }
-}
-h() {
-  g(null, false);
-}
-''';
-    var expected = '''
-class C {
-  int i;
-  C(this.i) {
-    f(i);
-  }
-}
-f(int j) {
-  assert(j != null);
-}
-g(int? k, bool b) {
-  if (b) {
-    C(k!);
-  }
-}
-h() {
-  g(null, false);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_non_null_intent_propagated_through_substitution_nodes() async {
-    var content = '''
-abstract class C {
-  void f(List x, int y) {
-    x.add(y);
-  }
-  int/*?*/ g();
-  void test() {
-    f([], g());
-  }
-}
-''';
-    var expected = '''
-abstract class C {
-  void f(List x, int y) {
-    x.add(y);
-  }
-  int? g();
-  void test() {
-    f([], g()!);
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_non_nullable_hint_comment_overrides_uncheckable_edge() async {
-    var content = '''
-Iterable f(List x) => x.map(g);
-int g(int/*!*/ x) => x + 1;
-main() {
-  f([null]);
-}
-''';
-    // TODO(paulberry): we should do something to flag the fact that g can't be
-    // safely passed to f.
-    var expected = '''
-Iterable f(List x) => x.map(g as int Function(int?));
-int g(int x) => x + 1;
-main() {
-  f([null]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_not_definitely_assigned_value() async {
-    var content = '''
-String f(bool b) {
-  String s;
-  if (b) {
-    s = 'true';
-  }
-  return s;
-}
-''';
-    var expected = '''
-String? f(bool b) {
-  String? s;
-  if (b) {
-    s = 'true';
-  }
-  return s;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_call_followed_by_if_null() async {
-    var content = '''
-typedef MapGetter = Map Function();
-void _f(Map m) {}
-void _g(MapGetter/*?*/ mapGetter) {
-  _f(mapGetter?.call() ?? {});
-}
-''';
-    var expected = '''
-typedef MapGetter = Map Function();
-void _f(Map m) {}
-void _g(MapGetter? mapGetter) {
-  _f(mapGetter?.call() ?? {});
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_call_on_closure_param_not_nullable() async {
-    // The null-aware access on `i` is *not* considered a strong enough signal
-    // that `i` is meant to be nullable, because the migration tool can see all
-    // callers of the closure, so it can tell whether it needs to be nullable or
-    // not.
-    //
-    // (Note: this is not strictly true, because the closure could be called
-    // from elsewhere.  But it's a heuristic that seems to be usually right in
-    // the cases we've found so far.)
-    var content = '''
-main() {
-  var x = (int i) => i?.abs();
-}
-''';
-    var expected = '''
-main() {
-  var x = (int i) => i.abs();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_call_on_local_param_not_nullable() async {
-    // The null-aware access on `i` is *not* considered a strong enough signal
-    // that `i` is meant to be nullable, because the migration tool can see all
-    // callers of `f`, so it can tell whether it needs to be nullable or not.
-    //
-    // (Note: this is not strictly true, because the local function could be
-    // torn off and called from elsewhere.  But it's a heuristic that seems to
-    // be usually right in the cases we've found so far.)
-    var content = '''
-main() {
-  int f(int i) => i?.abs();
-}
-''';
-    var expected = '''
-main() {
-  int f(int i) => i.abs();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_call_on_migrated_get() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D get g;
-}
-abstract class D {
-  int f2();
-}
-''';
-    // Since `.g` is a non-nullable getter in an already-migrated class, the
-    // `?.` can safely be replaced with `.`.  We can safely make this change
-    // even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C c) => c.g?.f2();
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C c) => c.g.f2();
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_call_on_migrated_get_null_shorting() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D get g;
-}
-abstract class D {
-  int f2();
-}
-''';
-    // Since `.g` is a non-nullable getter in an already-migrated class, the
-    // `?.` can safely be replaced with `.`.  We can safely make this change
-    // even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C/*?*/ c) => c?.g?.f2();
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C? c) => c?.g.f2();
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_call_on_migrated_method() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D f();
-}
-abstract class D {
-  int f2();
-}
-''';
-    // Since `.f()` is a method with a non-nullable return type in an
-    // already-migrated class, the `?.` can safely be replaced with `.`.  We can
-    // safely make this change even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C c) => c.f()?.f2();
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C c) => c.f().f2();
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_call_on_migrated_method_null_shorting() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D f();
-}
-abstract class D {
-  int f2();
-}
-''';
-    // Since `.f()` is a method with a non-nullable return type in an
-    // already-migrated class, the `?.` can safely be replaced with `.`.  We can
-    // safely make this change even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C/*?*/ c) => c?.f()?.f2();
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C? c) => c?.f().f2();
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_call_on_nullable_get() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D? get g;
-}
-abstract class D {
-  int f2();
-}
-''';
-    // Since `.g` is a nullable getter in an already-migrated class, we don't
-    // replace `?.` with `.`.
-    var content = '''
-import 'migrated.dart';
-f(C c) => c.g?.f2();
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C c) => c.g?.f2();
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput});
-  }
-
-  Future test_null_aware_call_on_nullable_method() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D? f();
-}
-abstract class D {
-  int f2();
-}
-''';
-    // Since `.f()` is a method with a nullable return type in an
-    // already-migrated class, we don't replace `?.` with `.`.
-    var content = '''
-import 'migrated.dart';
-f(C c) => c.f()?.f2();
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C c) => c.f()?.f2();
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput});
-  }
-
-  Future test_null_aware_call_on_private_param_not_nullable() async {
-    // The null-aware access on `i` is *not* considered a strong enough signal
-    // that `i` is meant to be nullable, because the migration tool can see all
-    // callers of `_f`, so it can tell whether it needs to be nullable or not.
-    var content = 'int _f(int i) => i?.abs();';
-    var expected = 'int _f(int i) => i.abs();';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_call_on_public_param_implies_nullable() async {
-    // The null-aware access on `i` is considered a strong signal that `i` is
-    // meant to be nullable.
-    var content = 'int f(int i) => i?.abs();';
-    var expected = 'int? f(int? i) => i?.abs();';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_null_aware_call_on_public_param_overridable_by_hint() async {
-    // The null-aware access on `i` is considered a strong signal that `i` is
-    // meant to be nullable, but an explicit `/*!*/` is a stronger signal.
-    var content = 'int f(int/*!*/ i) => i?.abs();';
-    var expected = 'int f(int i) => i.abs();';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_null_aware_call_on_public_param_overridable_by_intent() async {
-    // The null-aware access on `i` is considered a strong signal that `i` is
-    // meant to be nullable, but non-null intent is a stronger signal.
-    var content = '''
-int f(int i) {
-  print(i + 1);
-  return i?.abs();
-}
-''';
-    var expected = '''
-int f(int i) {
-  print(i + 1);
-  return i.abs();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_call_on_unmigrated_get() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class D {
-  int f2();
-}
-''';
-    // Since `.g` is unmigrated, we don't replace `?.` with `.` in "warn on weak
-    // code" mode.
-    var content = '''
-import 'migrated.dart';
-abstract class C {
-  D get g;
-}
-f(C c) => c.g?.f2();
-''';
-    var expected = '''
-import 'migrated.dart';
-abstract class C {
-  D get g;
-}
-f(C c) => c.g?.f2();
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_call_on_unmigrated_method() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class D {
-  int f2();
-}
-''';
-    // Since `.f()` is unmigrated, we don't replace `?.` with `.` in "warn on
-    // weak code" mode.
-    var content = '''
-import 'migrated.dart';
-abstract class C {
-  D f();
-}
-f(C c) => c.f()?.f2();
-''';
-    var expected = '''
-import 'migrated.dart';
-abstract class C {
-  D f();
-}
-f(C c) => c.f()?.f2();
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_call_tearoff() async {
-    // Kind of a weird use case because `f?.call` is equivalent to `f`, but
-    // let's make sure we analyze it correctly.
-    var content =
-        'int Function(int) g(int/*?*/ Function(int)/*?*/ f) => f?.call;';
-    var expected = 'int? Function(int)? g(int? Function(int)? f) => f?.call;';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_get_on_closure_param_not_nullable() async {
-    // The null-aware access on `i` is *not* considered a strong enough signal
-    // that `i` is meant to be nullable, because the migration tool can see all
-    // callers of the closure, so it can tell whether it needs to be nullable or
-    // not.
-    //
-    // (Note: this is not strictly true, because the closure could be called
-    // from elsewhere.  But it's a heuristic that seems to be usually right in
-    // the cases we've found so far.)
-    var content = '''
-main() {
-  var x = (int i) => i?.isEven;
-}
-''';
-    var expected = '''
-main() {
-  var x = (int i) => i.isEven;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_get_on_local_param_not_nullable() async {
-    // The null-aware access on `i` is *not* considered a strong enough signal
-    // that `i` is meant to be nullable, because the migration tool can see all
-    // callers of `f`, so it can tell whether it needs to be nullable or not.
-    //
-    // (Note: this is not strictly true, because the local function could be
-    // torn off and called from elsewhere.  But it's a heuristic that seems to
-    // be usually right in the cases we've found so far.)
-    var content = '''
-main() {
-  bool f(int i) => i?.isEven;
-}
-''';
-    var expected = '''
-main() {
-  bool f(int i) => i.isEven;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_get_on_migrated_get() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D get g;
-}
-abstract class D {
-  int get g2;
-}
-''';
-    // Since `.g` is a non-nullable getter in an already-migrated class, the
-    // `?.` can safely be replaced with `.`.  We can safely make this change
-    // even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C c) => c.g?.g2;
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C c) => c.g.g2;
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_get_on_migrated_get_null_shorting() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D get g;
-}
-abstract class D {
-  int get g2;
-}
-''';
-    // Since `.g` is a non-nullable getter in an already-migrated class, the
-    // `?.` can safely be replaced with `.`.  We can safely make this change
-    // even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C/*?*/ c) => c?.g?.g2;
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C? c) => c?.g.g2;
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_get_on_migrated_method() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D f();
-}
-abstract class D {
-  int get g2;
-}
-''';
-    // Since `.f()` is a method with a non-nullable return type in an
-    // already-migrated class, the `?.` can safely be replaced with `.`.  We can
-    // safely make this change even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C c) => c.f()?.g2;
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C c) => c.f().g2;
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_get_on_migrated_method_null_shorting() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D f();
-}
-abstract class D {
-  int get g2;
-}
-''';
-    // Since `.f()` is a method with a non-nullable return type in an
-    // already-migrated class, the `?.` can safely be replaced with `.`.  We can
-    // safely make this change even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C/*?*/ c) => c?.f()?.g2;
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C? c) => c?.f().g2;
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_get_on_private_param_not_nullable() async {
-    // The null-aware access on `i` is *not* considered a strong enough signal
-    // that `i` is meant to be nullable, because the migration tool can see all
-    // callers of `_f`, so it can tell whether it needs to be nullable or not.
-    var content = 'bool _f(int i) => i?.isEven;';
-    var expected = 'bool _f(int i) => i.isEven;';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_get_on_public_param_implies_nullable() async {
-    // The null-aware access on `i` is considered a strong signal that `i` is
-    // meant to be nullable.
-    var content = 'bool f(int i) => i?.isEven;';
-    var expected = 'bool? f(int? i) => i?.isEven;';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_get_on_public_param_overridable_by_hint() async {
-    // The null-aware access on `i` is considered a strong signal that `i` is
-    // meant to be nullable, but an explicit `/*!*/` is a stronger signal.
-    var content = 'bool f(int/*!*/ i) => i?.isEven;';
-    var expected = 'bool f(int i) => i.isEven;';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_null_aware_get_on_public_param_overridable_by_intent() async {
-    // The null-aware access on `i` is considered a strong signal that `i` is
-    // meant to be nullable, but non-null intent is a stronger signal.
-    var content = '''
-bool f(int i) {
-  print(i + 1);
-  return i?.isEven;
-}
-''';
-    var expected = '''
-bool f(int i) {
-  print(i + 1);
-  return i.isEven;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_getter_invocation() async {
-    var content = '''
-bool f(int i) => i?.isEven;
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-bool? f(int? i) => i?.isEven;
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_method_invocation() async {
-    var content = '''
-int f(int i) => i?.abs();
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-int? f(int? i) => i?.abs();
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_set_on_closure_param_not_nullable() async {
-    // The null-aware access on `c` is *not* considered a strong enough signal
-    // that `c` is meant to be nullable, because the migration tool can see all
-    // callers of the closure, so it can tell whether it needs to be nullable or
-    // not.
-    //
-    // (Note: this is not strictly true, because the closure could be called
-    // from elsewhere.  But it's a heuristic that seems to be usually right in
-    // the cases we've found so far.)
-    var content = '''
-class C {
-  int i = 0;
-}
-main() {
-  var x = (C c) { c?.i = 0; };
-}
-''';
-    var expected = '''
-class C {
-  int i = 0;
-}
-main() {
-  var x = (C c) { c.i = 0; };
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_set_on_local_param_not_nullable() async {
-    // The null-aware access on `c` is *not* considered a strong enough signal
-    // that `c` is meant to be nullable, because the migration tool can see all
-    // callers of `f`, so it can tell whether it needs to be nullable or not.
-    //
-    // (Note: this is not strictly true, because the local function could be
-    // torn off and called from elsewhere.  But it's a heuristic that seems to
-    // be usually right in the cases we've found so far.)
-    var content = '''
-class C {
-  int i = 0;
-}
-main() {
-  void f(C c) { c?.i = 0; }
-}
-''';
-    var expected = '''
-class C {
-  int i = 0;
-}
-main() {
-  void f(C c) { c.i = 0; }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_set_on_migrated_get() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D get g;
-}
-abstract class D {
-  set s(int i);
-}
-''';
-    // Since `.g` is a non-nullable getter in an already-migrated class, the
-    // `?.` can safely be replaced with `.`.  We can safely make this change
-    // even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C c) => c.g?.s = 0;
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C c) => c.g.s = 0;
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_set_on_migrated_get_null_shorting() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D get g;
-}
-abstract class D {
-  set s(int i);
-}
-''';
-    // Since `.g` is a non-nullable getter in an already-migrated class, the
-    // `?.` can safely be replaced with `.`.  We can safely make this change
-    // even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C/*?*/ c) => c?.g?.s = 0;
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C? c) => c?.g.s = 0;
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_set_on_migrated_method() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D f();
-}
-abstract class D {
-  set s(int i);
-}
-''';
-    // Since `.f()` is a method with a non-nullable return type in an
-    // already-migrated class, the `?.` can safely be replaced with `.`.  We can
-    // safely make this change even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C c) => c.f()?.s = 0;
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C c) => c.f().s = 0;
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_set_on_migrated_method_null_shorting() async {
-    var migratedInput = '''
-// @dart=2.12
-abstract class C {
-  D f();
-}
-abstract class D {
-  set s(int i);
-}
-''';
-    // Since `.f()` is a method with a non-nullable return type in an
-    // already-migrated class, the `?.` can safely be replaced with `.`.  We can
-    // safely make this change even if we are in "warn on weak code" mode.
-    var content = '''
-import 'migrated.dart';
-f(C/*?*/ c) => c?.f()?.s = 0;
-''';
-    var expected = '''
-import 'migrated.dart';
-f(C? c) => c?.f().s = 0;
-''';
-    await _checkSingleFileChanges(content, expected,
-        migratedInput: {'$projectPath/lib/migrated.dart': migratedInput},
-        warnOnWeakCode: true);
-  }
-
-  Future test_null_aware_set_on_private_param_not_nullable() async {
-    // The null-aware access on `c` is *not* considered a strong enough signal
-    // that `c` is meant to be nullable, because the migration tool can see all
-    // callers of `_f`, so it can tell whether it needs to be nullable or not.
-    var content = '''
-class C {
-  int i = 0;
-}
-void _f(C c) { c?.i = 0; }
-''';
-    var expected = '''
-class C {
-  int i = 0;
-}
-void _f(C c) { c.i = 0; }
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_set_on_public_param_implies_nullable() async {
-    // The null-aware access on `c` is considered a strong signal that `c` is
-    // meant to be nullable.
-    var content = '''
-class C {
-  int i = 0;
-}
-void f(C c) { c?.i = 0; }
-''';
-    var expected = '''
-class C {
-  int i = 0;
-}
-void f(C? c) { c?.i = 0; }
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_set_on_public_param_overridable_by_hint() async {
-    // The null-aware access on `c` is considered a strong signal that `c` is
-    // meant to be nullable, but an explicit `/*!*/` is a stronger signal.
-    var content = '''
-class C {
-  int i = 0;
-}
-void f(C/*!*/ c) { c?.i = 0; }
-''';
-    var expected = '''
-class C {
-  int i = 0;
-}
-void f(C c) { c.i = 0; }
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_null_aware_set_on_public_param_overridable_by_intent() async {
-    // The null-aware access on `c` is considered a strong signal that `c` is
-    // meant to be nullable, but non-null intent is a stronger signal.
-    var content = '''
-class C {
-  int i = 0;
-}
-void f(C c) {
-  print(c.i);
-  c?.i = 0;
-}
-''';
-    var expected = '''
-class C {
-  int i = 0;
-}
-void f(C c) {
-  print(c.i);
-  c.i = 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_setter_invocation_null_target() async {
-    var content = '''
-class C {
-  void set x(int value) {}
-}
-int f(C c) => c?.x = 1;
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-class C {
-  void set x(int value) {}
-}
-int? f(C? c) => c?.x = 1;
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_aware_setter_invocation_null_value() async {
-    var content = '''
-class C {
-  void set x(int value) {}
-}
-int f(C c) => c?.x = 1;
-main() {
-  f(null);
-}
-''';
-    var expected = '''
-class C {
-  void set x(int value) {}
-}
-int? f(C? c) => c?.x = 1;
-main() {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_check_in_cascade_target() async {
-    var content = '''
-class _C {
-  f() {}
-}
-_C g(int/*!*/ i) => _C();
-test(int/*?*/ j) {
-  g(j)..f();
-}
-''';
-    var expected = '''
-class _C {
-  f() {}
-}
-_C g(int i) => _C();
-test(int? j) {
-  g(j!)..f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_check_type_parameter_type_with_nullable_bound() async {
-    var content = '''
-abstract class C/*?*/> {
-  void f(T iter) {
-    for(var i in iter) {}
-  }
-}
-''';
-    var expected = '''
-abstract class C?> {
-  void f(T iter) {
-    for(var i in iter!) {}
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_in_conditional_expression() async {
-    var content = '''
-void f() {
-  List x = false ? [] : null;
-}
-''';
-    var expected = '''
-void f() {
-  List? x = false ? [] : null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_null_typed_expression_wiithout_valid_migration() async {
-    var content = '''
-void f(int/*!*/ x) {}
-void g() {
-  f(h());
-}
-Null h() => null;
-''';
-    var expected = '''
-void f(int x) {}
-void g() {
-  f(h());
-}
-Null h() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_nullable_use_of_typedef() async {
-    var content = '''
-typedef F = int Function(T);
-F f = null;
-void main() {
-  f('foo');
-}
-''';
-    var expected = '''
-typedef F = int Function(T);
-F? f = null;
-void main() {
-  f!('foo');
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_nullTestOnGenericType_explicitBound() async {
-    var content = '''
-void f(T x, T y) {
-  if (x == null) return;
-  if (y == null) return;
-}
-g() => f(1, null);
-''';
-    var expected = '''
-void f(T? x, T? y) {
-  if (x == null) return;
-  if (y == null) return;
-}
-g() => f(1, null);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_nullTestOnGenericType_implicitBound() async {
-    var content = '''
-void f(T x, T y) {
-  if (x == null) return;
-  if (y == null) return;
-}
-g() => f(1, null);
-''';
-    var expected = '''
-void f(T? x, T? y) {
-  if (x == null) return;
-  if (y == null) return;
-}
-g() => f(1, null);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_nullTestOnGenericType_nonNullableBound() async {
-    var content = '''
-void f(T x, T y) {
-  if (x == null) return;
-  if (y == null) return;
-}
-''';
-    var expected = '''
-void f(T? x, T? y) {
-  if (x == null) return;
-  if (y == null) return;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_nullTestOnGenericType_nullableBound() async {
-    var content = '''
-void f(T x, T y) {
-  if (x == null) return;
-  if (y == null) return;
-}
-g() => f(1, null);
-''';
-    var expected = '''
-void f(T? x, T? y) {
-  if (x == null) return;
-  if (y == null) return;
-}
-g() => f(1, null);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_operator_eq_with_inferred_parameter_type() async {
-    var content = '''
-class C {
-  operator==(Object other) {
-    return other is C;
-  }
-}
-''';
-    var expected = '''
-class C {
-  operator==(Object other) {
-    return other is C;
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_override_object_from_type_parameter() async {
-    var content = '''
-class C {
-  f(T t) {}
-}
-class D extends C {
-  @override
-  f(Object t) {}
-}
-''';
-    var expected = '''
-class C {
-  f(T t) {}
-}
-class D extends C {
-  @override
-  f(Object? t) {}
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_override_parameter_type_non_nullable() async {
-    var content = '''
-abstract class Base {
-  void f(int i);
-}
-class Derived extends Base {
-  void f(int i) {
-    i + 1;
-  }
-}
-void _g(int i, bool b, Base base) {
-  if (b) {
-    base.f(i);
-  }
-}
-void _h(Base base) {
-  _g(null, false, base);
-}
-''';
-    var expected = '''
-abstract class Base {
-  void f(int? i);
-}
-class Derived extends Base {
-  void f(int? i) {
-    i! + 1;
-  }
-}
-void _g(int? i, bool b, Base base) {
-  if (b) {
-    base.f(i);
-  }
-}
-void _h(Base base) {
-  _g(null, false, base);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_override_parameter_type_nullable() async {
-    var content = '''
-abstract class Base {
-  void f(int i);
-}
-class Derived extends Base {
-  void f(int i) {}
-}
-void _g(int i, Base base) {
-  base.f(null);
-}
-''';
-    var expected = '''
-abstract class Base {
-  void f(int? i);
-}
-class Derived extends Base {
-  void f(int? i) {}
-}
-void _g(int i, Base base) {
-  base.f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_override_parameter_type_unknown() async {
-    var content = '''
-abstract class Base {
-  void f(int/*!*/ i, int/*!*/ j);
-}
-class Derived extends Base {
-  void f(int i, int j) {
-    i + 1;
-  }
-}
-''';
-    var expected = '''
-abstract class Base {
-  void f(int i, int j);
-}
-class Derived extends Base {
-  void f(int i, int j) {
-    i + 1;
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_override_return_type_non_nullable() async {
-    var content = '''
-abstract class Base {
-  int/*!*/ f();
-}
-class Derived extends Base {
-  int f() => g();
-}
-int g() => null;
-''';
-    var expected = '''
-abstract class Base {
-  int f();
-}
-class Derived extends Base {
-  int f() => g()!;
-}
-int? g() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_override_return_type_nullable() async {
-    var content = '''
-abstract class Base {
-  int f();
-}
-class Derived extends Base {
-  int f() => null;
-}
-''';
-    var expected = '''
-abstract class Base {
-  int? f();
-}
-class Derived extends Base {
-  int? f() => null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_override_return_type_nullable_substitution_complex() async {
-    var content = '''
-abstract class Base {
-  T f();
-}
-class Derived extends Base> {
-  List f() => [null];
-}
-''';
-    var expected = '''
-abstract class Base {
-  T f();
-}
-class Derived extends Base> {
-  List f() => [null];
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_override_return_type_nullable_substitution_simple() async {
-    var content = '''
-abstract class Base {
-  T f();
-}
-class Derived extends Base {
-  int f() => null;
-}
-''';
-    var expected = '''
-abstract class Base {
-  T f();
-}
-class Derived extends Base {
-  int? f() => null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_parameter_genericFunctionType() async {
-    var content = '''
-int _f(int x, int Function(int i) g) {
-  return g(x);
-}
-''';
-    var expected = '''
-int _f(int x, int Function(int i) g) {
-  return g(x);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): cfg is no longer altered here, remove?
-  Future test_postdominating_usage_after_cfg_altered() async {
-    // By altering the control-flow graph, we can create new postdominators,
-    // which are not recognized as such. This is not a problem as we only do
-    // hard edges on a best-effort basis, and this case would be a lot of
-    // additional complexity.
-    var content = '''
-int f(int a, int b, int c) {
-  if (a != null) {
-    b.toDouble();
-  } else {
-    return null;
-  }
-  c.toDouble;
-}
-
-void main() {
-  f(1, null, null);
-}
-''';
-    var expected = '''
-int? f(int? a, int? b, int? c) {
-  if (a != null) {
-    b!.toDouble();
-  } else {
-    return null;
-  }
-  c!.toDouble;
-}
-
-void main() {
-  f(1, null, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected, removeViaComments: true);
-  }
-
-  Future test_prefix_minus() async {
-    var content = '''
-class C {
-  D operator-() => null;
-}
-class D {}
-D test(C c) => -c;
-''';
-    var expected = '''
-class C {
-  D? operator-() => null;
-}
-class D {}
-D? test(C c) => -c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_prefix_minus_substitute() async {
-    var content = '''
-abstract class C {
-  D operator-();
-}
-class D {}
-D test(C c) => -c;
-''';
-    var expected = '''
-abstract class C {
-  D operator-();
-}
-class D {}
-D test(C c) => -c;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_prefixes() async {
-    var root = '$projectPath/lib';
-    var path1 = convertPath('$root/file1.dart');
-    var file1 = '''
-import 'file2.dart';
-int x;
-int f() => null;
-''';
-    var expected1 = '''
-import 'file2.dart';
-int? x;
-int? f() => null;
-''';
-    var path2 = convertPath('$root/file2.dart');
-    var file2 = '''
-import 'file1.dart' as f1;
-void main() {
-  f1.x = f1.f();
-}
-''';
-    var expected2 = '''
-import 'file1.dart' as f1;
-void main() {
-  f1.x = f1.f();
-}
-''';
-    await _checkMultipleFileChanges(
-        {path1: file1, path2: file2}, {path1: expected1, path2: expected2});
-  }
-
-  Future test_prefixExpression_bang() async {
-    var content = '''
-bool f(bool b) => !b;
-void g(bool b1, bool b2) {
-  if (b1) {
-    f(b2);
-  }
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-bool f(bool b) => !b;
-void g(bool b1, bool? b2) {
-  if (b1) {
-    f(b2!);
-  }
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_promotion_conditional_variableRead() async {
-    var content = '''
-_f({int i}) {
-  i = i == null ? 0 : i;
-  _g(i);
-}
-
-_g(int j) {}
-''';
-    var expected = '''
-_f({int? i}) {
-  i = i == null ? 0 : i;
-  _g(i);
-}
-
-_g(int j) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_promotion_ifNull_variableRead() async {
-    var content = '''
-_f({int i}) {
-  i ??= 3;
-  _g(i);
-}
-
-_g(int j) {}
-''';
-    var expected = '''
-_f({int? i}) {
-  i ??= 3;
-  _g(i);
-}
-
-_g(int j) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_promotion_ifNull_variableRead_alreadyPromoted() async {
-    var content = '''
-_f({num i}) {
-  if (i is int /*?*/) {
-    i ??= 3;
-    _g(i);
-  }
-}
-
-_g(int j) {}
-''';
-    var expected = '''
-_f({num? i}) {
-  if (i is int?) {
-    i ??= 3;
-    _g(i);
-  }
-}
-
-_g(int j) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_promotion_ifNull_variableRead_subType() async {
-    var content = '''
-_f({num i}) {
-  i ??= 3;
-  _g(i);
-}
-
-_g(int j) {}
-''';
-    var expected = '''
-_f({num? i}) {
-  i ??= 3;
-  _g(i as int);
-}
-
-_g(int j) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_promotion_preserves_complex_types() async {
-    var content = '''
-int/*!*/ f(List/*?*/ x) {
-  x ??= [0];
-  return x[0];
-}
-''';
-    // `x ??= [0]` promotes x from List? to List.  Since there is
-    // still a `?` on the `int`, `x[0]` must be null checked.
-    var expected = '''
-int f(List? x) {
-  x ??= [0];
-  return x[0]!;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_propagate_non_null_intent_into_function_literal() async {
-    var content = '''
-void f(int/*!*/ Function(int) callback) {
-  callback(null);
-}
-void test() {
-  f((int x) => x);
-}
-''';
-    // Since the function literal `(int x) => x` is created right here at the
-    // point where it's passed to `f`'s `callback` parameter, non-null intent is
-    // allowed to propagate backward from the return type of `callback` to the
-    // return type of the function literal.  As a result, the reference to `x`
-    // in the function literal is null checked.
-    var expected = '''
-void f(int Function(int?) callback) {
-  callback(null);
-}
-void test() {
-  f((int? x) => x!);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_property_access_on_cascade_result() async {
-    var content = '''
-int f(List l) {
-  l..first.isEven
-   ..firstWhere((_) => true).isEven
-   ..[0].isEven;
-}
-
-void g() {
-  f([null]);
-}
-''';
-    var expected = '''
-int f(List l) {
-  l..first!.isEven
-   ..firstWhere((_) => true)!.isEven
-   ..[0]!.isEven;
-}
-
-void g() {
-  f([null]);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_quiver_checkNotNull_field_formal_initializer() async {
-    addQuiverPackage();
-    var content = '''
-import 'package:quiver/check.dart';
-class C {
-  final int i;
-  C(this.i) {
-    checkNotNull(i);
-  }
-}
-void f(bool b, int i) {
-  if (b) new C(i);
-}
-main() {
-  f(false, null);
-}
-''';
-    // Note: since the reference to `i` in `checkNotNull(i)` refers to the field
-    // rather than the formal parameter, this isn't considered sufficient to
-    // mark the field as non-nullable (even though that's the clear intention
-    // in this case).  Changing the behavior to match user intent would require
-    // more development work; for now we just want to make sure we provide a
-    // fairly reasonable migration without crashing.
-    var expected = '''
-import 'package:quiver/check.dart';
-class C {
-  final int? i;
-  C(this.i) {
-    checkNotNull(i);
-  }
-}
-void f(bool b, int? i) {
-  if (b) new C(i);
-}
-main() {
-  f(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_quiver_checkNotNull_implies_non_null_intent() async {
-    addQuiverPackage();
-    var content = '''
-import 'package:quiver/check.dart';
-void f(int i) {
-  checkNotNull(i);
-}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-import 'package:quiver/check.dart';
-void f(int i) {
-  checkNotNull(i);
-}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_redirecting_constructor_factory() async {
-    var content = '''
-class C {
-  factory C(int i, int j) = D;
-}
-class D implements C {
-  D(int i, int j);
-}
-main() {
-  C(null, 1);
-}
-''';
-    var expected = '''
-class C {
-  factory C(int? i, int? j) = D;
-}
-class D implements C {
-  D(int? i, int? j);
-}
-main() {
-  C(null, 1);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_redirecting_constructor_ordinary() async {
-    var content = '''
-class C {
-  C(int i, int j) : this.named(j, i);
-  C.named(int j, int i);
-}
-main() {
-  C(null, 1);
-}
-''';
-    var expected = '''
-class C {
-  C(int? i, int? j) : this.named(j, i);
-  C.named(int? j, int? i);
-}
-main() {
-  C(null, 1);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_redirecting_constructor_ordinary_to_unnamed() async {
-    var content = '''
-class C {
-  C.named(int i, int j) : this(j, i);
-  C(int j, int i);
-}
-main() {
-  C.named(null, 1);
-}
-''';
-    var expected = '''
-class C {
-  C.named(int? i, int? j) : this(j, i);
-  C(int? j, int? i);
-}
-main() {
-  C.named(null, 1);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_reference_to_mixin_getter() async {
-    var content = '''
-mixin M {
-  Object f() => this.x;
-
-  Object get x => null;
-}
-''';
-    var expected = '''
-mixin M {
-  Object? f() => this.x;
-
-  Object? get x => null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_regression_40551() async {
-    var content = '''
-class B { // bound should not be made nullable
-  void f(T t) { // parameter should not be made nullable
-    // Create an edge from the bound to some type
-    List x = [t];
-    // and make that type exact nullable
-    x[0] = null;
-  }
-}
-''';
-    var expected = '''
-class B { // bound should not be made nullable
-  void f(T t) { // parameter should not be made nullable
-    // Create an edge from the bound to some type
-    List x = [t];
-    // and make that type exact nullable
-    x[0] = null;
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_regression_40552() async {
-    var content = '''
-void _f(Object o) { // parameter should not be made nullable
-  // Create an edge from the bound to some type
-  List x = [o];
-  // and make that type exact nullable
-  x[0] = null;
-}
-''';
-    var expected = '''
-void _f(Object o) { // parameter should not be made nullable
-  // Create an edge from the bound to some type
-  List x = [o];
-  // and make that type exact nullable
-  x[0] = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_regression_42374() async {
-    var content = '''
-class C {
-  R m(dynamic x) {
-    assert(x is R);
-    return x as R;
-  }
-}
-
-void main() {
-  C().m(null/*!*/);
-}
-''';
-    var expected = '''
-class C {
-  R m(dynamic x) {
-    assert(x is R);
-    return x as R;
-  }
-}
-
-void main() {
-  C().m(null!);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_remove_question_from_question_dot() async {
-    var content = '_f(int/*!*/ i) => i?.isEven;';
-    var expected = '_f(int i) => i.isEven;';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_remove_question_from_question_dot_and_add_bang() async {
-    var content = '''
-class C {
-  int/*?*/ i;
-}
-int/*!*/ f(C/*!*/ c) => c?.i;
-''';
-    var expected = '''
-class C {
-  int? i;
-}
-int f(C c) => c.i!;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_remove_question_from_question_dot_method() async {
-    var content = '_f(int/*!*/ i) => i?.abs();';
-    var expected = '_f(int i) => i.abs();';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_remove_question_from_question_dot_shortcut() async {
-    var content = '''
-class C {
-  int/*!*/ i;
-}
-bool/*?*/ f(C/*?*/ c) => c?.i?.isEven;
-''';
-    var expected = '''
-class C {
-  int i;
-}
-bool? f(C? c) => c?.i.isEven;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): element is not removed anymore, remove test?
-  Future test_removed_if_element_doesnt_introduce_nullability() async {
-    // Failing because we don't yet remove the dead list element
-    // `if (x == null) recover()`.
-    var content = '''
-f(int x) {
-  [if (x == null) recover(), 0];
-}
-int recover() {
-  assert(false);
-  return null;
-}
-''';
-    var expected = '''
-f(int? x) {
-  [if (x == null) recover(), 0];
-}
-int? recover() {
-  assert(false);
-  return null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_requiredness_does_not_propagate_between_field_formal_params() async {
-    addMetaPackage();
-    var content = '''
-import 'package:meta/meta.dart';
-class C {
-  final bool x;
-  C.one({this.x});
-  C.two({@required this.x}) : assert(x != null);
-}
-test() => C.one();
-''';
-    var expected = '''
-import 'package:meta/meta.dart';
-class C {
-  final bool? x;
-  C.one({this.x});
-  C.two({required bool this.x}) : assert(x != null);
-}
-test() => C.one();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_return_future_or_null_from_async_method() async {
-    var content = '''
-import 'dart:async';
-Future f() async => g();
-FutureOr g() => null;
-''';
-    var expected = '''
-import 'dart:async';
-Future f() async => g();
-FutureOr g() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_setter_overrides_implicit_setter() async {
-    var content = '''
-class A {
-  String s = "x";
-}
-class C implements A {
-  String get s => "x";
-  void set s(String value) {}
-}
-f() => A().s = null;
-''';
-    var expected = '''
-class A {
-  String? s = "x";
-}
-class C implements A {
-  String get s => "x";
-  void set s(String? value) {}
-}
-f() => A().s = null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_single_file_multiple_changes() async {
-    var content = '''
-int f() => null;
-int g() => null;
-''';
-    var expected = '''
-int? f() => null;
-int? g() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_single_file_single_change() async {
-    var content = '''
-int f() => null;
-''';
-    var expected = '''
-int? f() => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_singleWhere_non_nullable() async {
-    var content = '''
-int singleEven(Iterable x)
-    => x.singleWhere((x) => x.isEven, orElse: () => null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? singleEven(Iterable x)
-    => x.singleWhereOrNull((x) => x.isEven);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_singleWhere_nullable() async {
-    var content = '''
-int singleEven(Iterable x)
-    => x.singleWhere((x) => x.isEven, orElse: () => null);
-f() => singleEven([null]);
-''';
-    var expected = '''
-int? singleEven(Iterable x)
-    => x.singleWhere((x) => x!.isEven, orElse: () => null);
-f() => singleEven([null]);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40728')
-  Future test_soft_edge_for_assigned_variable() async {
-    var content = '''
-void f(int i) {
-  print(i + 1);
-  i = null;
-  print(i);
-}
-main() {
-  f(0);
-}
-''';
-    var expected = '''
-void f(int? i) {
-  print(i! + 1);
-  i = null;
-  print(i);
-}
-main() {
-  f(0);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_tearoff_parameter_matching_named() async {
-    var content = '''
-void f(int x, void Function({int x}) callback) {
-  callback(x: x);
-}
-void g({int x}) {
-  assert(x != null);
-}
-void h() {
-  f(null, g);
-}
-''';
-    // Normally the assertion in g would cause g's `x` argument to be
-    // non-nullable (and thus required).  However, since g is torn off and
-    // passed to f, which requires a callback that accepts null, g's `x`
-    // argument is nullable (and thus not required).
-    var expected = '''
-void f(int? x, void Function({int? x}) callback) {
-  callback(x: x);
-}
-void g({int? x}) {
-  assert(x != null);
-}
-void h() {
-  f(null, g);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_testVariable_assignedInjectorGet() async {
-    addAngularPackage();
-    addTestCorePackage();
-    var content = '''
-import 'package:angular/angular.dart';
-import 'package:test/test.dart';
-void main() {
-  int i;
-  setUp(() {
-    var injector = Injector();
-    i = injector.get(int);
-  });
-  test('a', () {
-    i.isEven;
-  });
-}
-''';
-    var expected = '''
-import 'package:angular/angular.dart';
-import 'package:test/test.dart';
-void main() {
-  late int i;
-  setUp(() {
-    var injector = Injector();
-    i = injector.get(int);
-  });
-  test('a', () {
-    i.isEven;
-  });
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_testVariable_assignedInjectorGet_inDeclaration() async {
-    addAngularPackage();
-    addTestCorePackage();
-    var content = '''
-import 'package:angular/angular.dart';
-import 'package:test/test.dart';
-void main() {
-  setUp(() {
-    var injector = Injector();
-    int i = injector.get(int);
-    i.isEven;
-  });
-}
-''';
-    var expected = '''
-import 'package:angular/angular.dart';
-import 'package:test/test.dart';
-void main() {
-  setUp(() {
-    var injector = Injector();
-    int i = injector.get(int);
-    i.isEven;
-  });
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_testVariable_assignedInjectorGet_nullableUse() async {
-    addAngularPackage();
-    addTestCorePackage();
-    var content = '''
-import 'package:angular/angular.dart';
-import 'package:test/test.dart';
-void f(int /*?*/ i) {}
-void main() {
-  int i;
-  setUp(() {
-    var injector = Injector();
-    i = injector.get(int);
-  });
-  test('a', () {
-    f(i);
-  });
-}
-''';
-    var expected = '''
-import 'package:angular/angular.dart';
-import 'package:test/test.dart';
-void f(int? i) {}
-void main() {
-  late int i;
-  setUp(() {
-    var injector = Injector();
-    i = injector.get(int);
-  });
-  test('a', () {
-    f(i);
-  });
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_testVariable_assignedInjectorGet_outsideSetup() async {
-    addAngularPackage();
-    addTestCorePackage();
-    var content = '''
-import 'package:angular/angular.dart';
-void main() {
-  int i;
-  var injector = Injector();
-  i = injector.get(int);
-  i.isEven;
-}
-''';
-    var expected = '''
-import 'package:angular/angular.dart';
-void main() {
-  int? i;
-  var injector = Injector();
-  i = injector.get(int);
-  i!.isEven;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_testVariable_assignedNullableValue() async {
-    addTestCorePackage();
-    var content = '''
-import 'package:test/test.dart';
-void main() {
-  int i;
-  setUp(() {
-    i = null;
-  });
-  test('a', () {
-    i.isEven;
-  });
-}
-''';
-    var expected = '''
-import 'package:test/test.dart';
-void main() {
-  int? i;
-  setUp(() {
-    i = null;
-  });
-  test('a', () {
-    i!.isEven;
-  });
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_testVariable_downstreamAllNonNull() async {
-    addTestCorePackage();
-    var content = '''
-import 'package:test/test.dart';
-void main() {
-  int i;
-  setUp(() {
-    i = 1;
-  });
-  test('a', () {
-    i.isEven;
-  });
-}
-''';
-    var expected = '''
-import 'package:test/test.dart';
-void main() {
-  late int i;
-  setUp(() {
-    i = 1;
-  });
-  test('a', () {
-    i.isEven;
-  });
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_testVariable_hasInitializer() async {
-    addTestCorePackage();
-    var content = '''
-import 'package:test/test.dart';
-void main() {
-  int i = 1;
-  setUp(() {
-    i = 1;
-  });
-}
-''';
-    var expected = '''
-import 'package:test/test.dart';
-void main() {
-  int i = 1;
-  setUp(() {
-    i = 1;
-  });
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_testVariable_usedAsNullable() async {
-    addTestCorePackage();
-    var content = '''
-import 'package:test/test.dart';
-void main() {
-  int i;
-  setUp(() {
-    i = 1;
-  });
-  f(int /*?*/ i) {}
-  test('a', () {
-    f(i);
-  });
-}
-''';
-    var expected = '''
-import 'package:test/test.dart';
-void main() {
-  late int i;
-  setUp(() {
-    i = 1;
-  });
-  f(int? i) {}
-  test('a', () {
-    f(i);
-  });
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_this_inside_extension() async {
-    var content = '''
-class C {
-  T field;
-  C(this.field);
-}
-extension on C {
-  f() {
-    this.field = null;
-  }
-}
-extension on C> {
-  f() {
-    this.field = [null];
-  }
-}
-''';
-    var expected = '''
-class C {
-  T field;
-  C(this.field);
-}
-extension on C {
-  f() {
-    this.field = null;
-  }
-}
-extension on C> {
-  f() {
-    this.field = [null];
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future test_topLevelFunction_parameterType_implicit_dynamic() async {
-    var content = '''
-Object _f(x) => x;
-''';
-    // Note: even though the type `dynamic` permits `null`, the migration engine
-    // sees that there is no code path that passes a null value to `f`, so it
-    // leaves its return type as `Object`, and there is an implicit downcast.
-    var expected = '''
-Object _f(x) => x;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/39369')
-  Future test_topLevelFunction_returnType_implicit_dynamic() async {
-    var content = '''
-f() {}
-Object g() => f();
-''';
-    var expected = '''
-f() {}
-Object? g() => f();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_topLevelVariable_type_inferred() async {
-    var content = '''
-int f() => null;
-var x = 1;
-void main() {
-  x = f();
-}
-''';
-    // The type of x is inferred as non-nullable from its initializer, but we
-    // try to assign a nullable value to it.  So an explicit type must be added.
-    var expected = '''
-int? f() => null;
-int? x = 1;
-void main() {
-  x = f();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_topLevelVariable_uninitialized_used() async {
-    var content = '''
-String s;
-f() {
-  g(s);
-}
-g(String /*!*/ s) {}
-''';
-    var expected = '''
-late String s;
-f() {
-  g(s);
-}
-g(String s) {}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_two_files() async {
-    var root = '$projectPath/lib';
-    var path1 = convertPath('$root/file1.dart');
-    var file1 = '''
-import 'file2.dart';
-int f() => null;
-int h() => g();
-''';
-    var expected1 = '''
-import 'file2.dart';
-int? f() => null;
-int? h() => g();
-''';
-    var path2 = convertPath('$root/file2.dart');
-    var file2 = '''
-import 'file1.dart';
-int g() => f();
-''';
-    var expected2 = '''
-import 'file1.dart';
-int? g() => f();
-''';
-    await _checkMultipleFileChanges(
-        {path1: file1, path2: file2}, {path1: expected1, path2: expected2});
-  }
-
-  Future test_type_argument_flows_to_bound() async {
-    // The inference of C forces class C to be declared as
-    // C.
-    var content = '''
-abstract class C {
-  void m(T t);
-}
-abstract class D {
-  void m(T t);
-}
-_f(C c, D d) {
-  c.m(null);
-}
-''';
-    var expected = '''
-abstract class C {
-  void m(T t);
-}
-abstract class D {
-  void m(T t);
-}
-_f(C c, D d) {
-  c.m(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_complex() async {
-    var content = '''
-typedef F = Function(R);
-
-class C {
-  F _f;
-
-  C(this._f) {
-    f(null);
-  }
-
-  f(Object o) {
-    _f(o as T);
-  }
-}
-''';
-    var expected = '''
-typedef F = Function(R);
-
-class C {
-  F _f;
-
-  C(this._f) {
-    f(null);
-  }
-
-  f(Object? o) {
-    _f(o as T?);
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_migrated_lhs_parameters() async {
-    var content = '''
-import 'migrated_typedef.dart';
-void main(F f) {
-  f(null);
-}
-''';
-    var expected = '''
-import 'migrated_typedef.dart';
-void main(F f) {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/migrated_typedef.dart': '''
-// @dart=2.12
-typedef F = Function(R);
-'''
-    });
-  }
-
-  Future test_typedef_assign_null_migrated_lhs_rhs_parameters() async {
-    var content = '''
-import 'migrated_typedef.dart';
-void f1(F f) {
-  f(null, null);
-}
-void f2(F f) {
-  f(0, null);
-}
-void f3(F f) {
-  f(null, 1);
-}
-void f4(F f) {
-  f(0, 1);
-}
-''';
-    var expected = '''
-import 'migrated_typedef.dart';
-void f1(F f) {
-  f(null, null);
-}
-void f2(F f) {
-  f(0, null);
-}
-void f3(F f) {
-  f(null, 1);
-}
-void f4(F f) {
-  f(0, 1);
-}
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/migrated_typedef.dart': '''
-// @dart=2.12
-typedef F = Function(T, R);
-'''
-    });
-  }
-
-  Future test_typedef_assign_null_migrated_rhs_parameters() async {
-    var content = '''
-import 'migrated_typedef.dart';
-void main(F f) {
-  f(null);
-}
-''';
-    var expected = '''
-import 'migrated_typedef.dart';
-void main(F f) {
-  f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected, migratedInput: {
-      '$projectPath/lib/migrated_typedef.dart': '''
-// @dart=2.12
-typedef F = Function(R);
-'''
-    });
-  }
-
-  Future test_typedef_assign_null_parameter() async {
-    var content = '''
-typedef F = Function(int);
-
-F/*!*/ _f;
-
-f() {
-  _f(null);
-}
-''';
-    var expected = '''
-typedef F = Function(int?);
-
-late F _f;
-
-f() {
-  _f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_return() async {
-    var content = '''
-typedef F = int Function();
-
-F _f = () => null;
-''';
-    var expected = '''
-typedef F = int? Function();
-
-F _f = () => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-//  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40388')
-// TODO(yanok): the test stopped failing since we don't emit casts for
-// unrelated types anymore, but the issue mentioned still exists.
-  Future test_typedef_assign_null_return_type_formal() async {
-    var content = '''
-typedef F = T Function();
-
-F _f = () => null;
-''';
-    var expected = '''
-typedef F = T? Function();
-
-F _f = () => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_return_type_parameter() async {
-    var content = '''
-typedef F = T Function();
-
-F _f = () => null;
-''';
-    var expected = '''
-typedef F = T Function();
-
-F _f = () => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_type_formal() async {
-    var content = '''
-typedef F = Function(T);
-
-F/*!*/ _f;
-
-f() {
-  _f(null);
-}
-''';
-    var expected = '''
-typedef F = Function(T);
-
-late F _f;
-
-f() {
-  _f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_type_formal_with_parameter() async {
-    var content = '''
-typedef F = Function(T);
-
-F/*!*/ _f;
-
-f() {
-  _f(null);
-}
-''';
-    var expected = '''
-typedef F = Function(T);
-
-late F _f;
-
-f() {
-  _f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_type_parameter() async {
-    var content = '''
-typedef F = Function(T);
-
-F/*!*/ _f;
-
-f() {
-  _f(null);
-}
-''';
-    var expected = '''
-typedef F = Function(T);
-
-late F _f;
-
-f() {
-  _f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_type_parameter_non_null() async {
-    var content = '''
-typedef F = Function(T);
-
-F/*!*/ _f;
-
-f() {
-  _f(null);
-}
-''';
-    var expected = '''
-typedef F = Function(T);
-
-late F _f;
-
-f() {
-  _f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_assign_null_type_return_value_nested() async {
-    var content = '''
-typedef F = T Function();
-
-F> f = () => () => null;
-''';
-    var expected = '''
-typedef F = T Function();
-
-F> f = () => () => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_old_assign_null_parameter() async {
-    var content = '''
-typedef F(int x);
-
-F/*!*/ _f;
-
-f() {
-  _f(null);
-}
-''';
-    var expected = '''
-typedef F(int? x);
-
-late F _f;
-
-f() {
-  _f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_old_assign_null_return() async {
-    var content = '''
-typedef int F();
-
-F _f = () => null;
-''';
-    var expected = '''
-typedef int? F();
-
-F _f = () => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_old_assign_null_return_type_parameter() async {
-    var content = '''
-typedef T F();
-
-F _f = () => null;
-''';
-    var expected = '''
-typedef T F();
-
-F _f = () => null;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_old_assign_null_type_parameter() async {
-    var content = '''
-typedef F(T t);
-
-F/*!*/ _f;
-
-f() {
-  _f(null);
-}
-''';
-    var expected = '''
-typedef F(T t);
-
-late F _f;
-
-f() {
-  _f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_typedef_old_assign_null_type_parameter_non_null() async {
-    var content = '''
-typedef F(T t);
-
-F/*!*/ _f;
-
-f() {
-  _f(null);
-}
-''';
-    var expected = '''
-typedef F(T t);
-
-late F _f;
-
-f() {
-  _f(null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_assert_is_statement_implies_non_null_intent() async {
-    var content = '''
-void f(Object i) {
-  assert(i is int);
-}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(Object i) {
-  assert(i is int);
-}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_assert_statement_implies_non_null_intent() async {
-    var content = '''
-void f(int i) {
-  assert(i != null);
-}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(int i) {
-  assert(i != null);
-}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_binary_expression_implies_non_null_intent() async {
-    var content = '''
-void f(int i) {
-  i + 1;
-}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(int i) {
-  i + 1;
-}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_cascaded_indexed_set_implies_non_null_intent() async {
-    var content = '''
-class C {
-  operator[]=(int i, int j) {}
-}
-void _f(C c) {
-  c..[1] = 2;
-}
-void _g(bool b, C c) {
-  if (b) _f(c);
-}
-main() {
-  _g(false, null);
-}
-''';
-    var expected = '''
-class C {
-  operator[]=(int? i, int? j) {}
-}
-void _f(C c) {
-  c..[1] = 2;
-}
-void _g(bool b, C? c) {
-  if (b) _f(c!);
-}
-main() {
-  _g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_cascaded_method_call_implies_non_null_intent() async {
-    var content = '''
-void f(int i) {
-  i..abs();
-}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(int i) {
-  i..abs();
-}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_cascaded_property_set_implies_non_null_intent() async {
-    var content = '''
-class C {
-  int x = 0;
-}
-void f(C c) {
-  c..x = 1;
-}
-void g(bool b, C c) {
-  if (b) f(c);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-class C {
-  int x = 0;
-}
-void f(C c) {
-  c..x = 1;
-}
-void g(bool b, C? c) {
-  if (b) f(c!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_unconditional_method_call_implies_non_null_intent() async {
-    var content = '''
-void f(int i) {
-  i.abs();
-}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(int i) {
-  i.abs();
-}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_method_call_implies_non_null_intent_after_conditions() async {
-    var content = '''
-void g(bool b, int i1, int i2) {
-  int i3 = i1;
-  if (b) {
-    b;
-  }
-  i3.toDouble();
-  int i4 = i2;
-  if (b) {
-    b;
-    return;
-  }
-  i4.toDouble();
-}
-test(int/*?*/ n) {
-  g(false, n, null);
-}
-''';
-    var expected = '''
-void g(bool b, int i1, int? i2) {
-  int i3 = i1;
-  if (b) {
-    b;
-  }
-  i3.toDouble();
-  int? i4 = i2;
-  if (b) {
-    b;
-    return;
-  }
-  i4!.toDouble();
-}
-test(int? n) {
-  g(false, n!, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_method_call_implies_non_null_intent_in_condition() async {
-    var content = '''
-void g(bool b, int _i) {
-  if (b) {
-    int i = _i;
-    i.toDouble();
-  }
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void g(bool b, int? _i) {
-  if (b) {
-    int i = _i!;
-    i.toDouble();
-  }
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_non_null_usage_implies_non_null_intent() async {
-    var content = '''
-void _f(int i, int j) {
-  i.gcd(j);
-}
-void _g(bool b, int i, int j) {
-  if (b) _f(i, j);
-}
-main() {
-  _g(false, 0, null);
-}
-''';
-    var expected = '''
-void _f(int i, int j) {
-  i.gcd(j);
-}
-void _g(bool b, int i, int? j) {
-  if (b) _f(i, j!);
-}
-main() {
-  _g(false, 0, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_property_access_implies_non_null_intent() async {
-    var content = '''
-void f(int i) {
-  i.isEven;
-}
-void g(bool b, int i) {
-  if (b) f(i);
-}
-main() {
-  g(false, null);
-}
-''';
-    var expected = '''
-void f(int i) {
-  i.isEven;
-}
-void g(bool b, int? i) {
-  if (b) f(i!);
-}
-main() {
-  g(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_unconditional_usage_propagates_non_null_intent() async {
-    var content = '''
-void f(int i) {
-  assert(i != null);
-}
-void g(int i) {
-  f(i);
-}
-void h(bool b, int i) {
-  if (b) g(i);
-}
-main() {
-  h(false, null);
-}
-''';
-    var expected = '''
-void f(int i) {
-  assert(i != null);
-}
-void g(int i) {
-  f(i);
-}
-void h(bool b, int? i) {
-  if (b) g(i!);
-}
-main() {
-  h(false, null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_use_of_field_formal_param_does_not_create_hard_edge() async {
-    var content = '''
-class C {
-  int i;
-  int j;
-  C.one(this.i) : j = i + 1;
-  C.two() : i = null, j = 0;
-}
-''';
-    var expected = '''
-class C {
-  int? i;
-  int j;
-  C.one(int this.i) : j = i + 1;
-  C.two() : i = null, j = 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future
-      test_unconditional_use_of_field_formal_param_does_not_create_hard_edge_generic() async {
-    var content = '''
-class C {
-  List i;
-  int j;
-  C.one(this.i) : j = i.length;
-  C.two() : i = null, j = 0;
-}
-''';
-    var expected = '''
-class C {
-  List? i;
-  int j;
-  C.one(List this.i) : j = i.length;
-  C.two() : i = null, j = 0;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_uninitialized_instance_field_is_nullable() async {
-    var content = '''
-class C {
-  int i;
-  f() {
-    print(i == null);
-  }
-}
-''';
-    var expected = '''
-class C {
-  int? i;
-  f() {
-    print(i == null);
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_uninitialized_static_field_is_nullable() async {
-    var content = '''
-class C {
-  static int i;
-  f() {
-    print(i == null);
-  }
-}
-''';
-    var expected = '''
-class C {
-  static int? i;
-  f() {
-    print(i == null);
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_uninitialized_toplevel_var_is_nullable() async {
-    var content = '''
-int i;
-f() {
-  print(i == null);
-}
-''';
-    var expected = '''
-int? i;
-f() {
-  print(i == null);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_unnecessary_cast_remove() async {
-    var content = '''
-_f(Object x) {
-  if (x is! int) return;
-  print((x as int) + 1);
-}
-''';
-    var expected = '''
-_f(Object x) {
-  if (x is! int) return;
-  print(x + 1);
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/44012')
-  Future test_use_import_prefix_when_adding_re_exported_type() async {
-    addPackageFile('http', 'http.dart', '''
-export 'src/base_client.dart';
-export 'src/client.dart';
-''');
-    addPackageFile('http', 'src/base_client.dart', '''
-import 'client.dart';
-abstract class BaseClient implements Client {}
-''');
-    addPackageFile('http', 'src/client.dart', '''
-abstract class Client {}
-''');
-    var content = '''
-import 'package:http/http.dart' as http;
-http.BaseClient downcast(http.Client x) => x;
-''';
-    var expected = '''
-import 'package:http/http.dart' as http;
-http.BaseClient downcast(http.Client x) => x as http.BaseClient;
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_var_with_different_types() async {
-    // Based on https://github.com/dart-lang/sdk/issues/47669
-    var content = '''
-class C {
-  T m() => throw 'foo';
-}
-f(bool b, List> cs) {
-  var x = !b,
-      y = cs.first,
-      z = y.m();
-}
-''';
-    var expected = '''
-class C {
-  T m() => throw 'foo';
-}
-f(bool b, List> cs) {
-  var x = !b,
-      y = cs.first,
-      z = y.m();
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_var_with_different_types_becoming_explicit() async {
-    // When types need to be added to some variables in a declaration but not
-    // others, we handle it by introducing `as` casts.
-    var content = '''
-_f(int i, String s) {
-  var x = i, y = s;
-  x = null;
-}
-''';
-    var expected = '''
-_f(int i, String s) {
-  var x = i as int?, y = s;
-  x = null;
-}
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  // TODO(yanok): does it still make sense?
-  Future test_weak_if_visit_weak_subexpression() async {
-    var content = '''
-int f(int x, int/*?*/ y) {
-  if (x == null) {
-    print(y.toDouble());
-  } else {
-    print(y.toDouble());
-  }
-}
-''';
-    var expected = '''
-int f(int? x, int? y) {
-  if (x == null) {
-    print(y!.toDouble());
-  } else {
-    print(y!.toDouble());
-  }
-}
-''';
-    await _checkSingleFileChanges(content, expected, warnOnWeakCode: true);
-  }
-
-  Future test_whereNotNull() async {
-    var content = '''
-Iterable f(Iterable it) => it.where((s) => s != null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableNullableExtension;
-
-Iterable f(Iterable it) => it.whereNotNull();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_whereNotNull_and_firstWhereOrNull() async {
-    var content = '''
-Iterable f(Iterable it) => it.where((s) => s != null);
-int g(Iterable it) => it.firstWhere((i) => i != 0, orElse: () => null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableExtension, IterableNullableExtension;
-
-Iterable f(Iterable it) => it.whereNotNull();
-int? g(Iterable it) => it.firstWhereOrNull((i) => i != 0);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_whereNotNull_complexType() async {
-    var content = '''
-Iterable> f(Iterable/*?*/> it)
-    => it.where((m) => m != null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableNullableExtension;
-
-Iterable> f(Iterable?> it)
-    => it.whereNotNull();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_whereNotNull_iterable_dynamic() async {
-    var content = '''
-f(Iterable it) => it.where((s) => s != null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableNullableExtension;
-
-f(Iterable it) => it.whereNotNull();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/49103')
-  Future test_whereNotNull_iterable_U() async {
-    var content = '''
-f(Iterable it) => it.where((s) => s != null);
-''';
-    // whereNotNull cannot be used in this case, because its signature is:
-    //
-    //   extension IterableNullableExtension on Iterable {
-    //     Iterable whereNotNull() => ...;
-    //   }
-    //
-    // When the type system tries to solve for a substitution T=... that makes
-    // the extension apply, it gets T=U, but that doesn't work because U is not
-    // a subtype of Object.
-    //
-    // So the migration tool shouldn't change the `where` to `whereNotNull`.
-    var expected = '''
-f(Iterable it) => it.where((s) => s != null);
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_whereNotNull_iterable_U_extends_object() async {
-    var content = '''
-f(Iterable it) => it.where((s) => s != null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableNullableExtension;
-
-f(Iterable it) => it.whereNotNull();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-
-  Future test_whereNotNull_noContext() async {
-    var content = '''
-f(Iterable it) => it.where((s) => s != null);
-''';
-    var expected = '''
-import 'package:collection/collection.dart' show IterableNullableExtension;
-
-f(Iterable it) => it.whereNotNull();
-''';
-    await _checkSingleFileChanges(content, expected);
-  }
-}
-
-@reflectiveTest
-class _ProvisionalApiTestPermissive extends _ProvisionalApiTestBase
-    with _ProvisionalApiTestCases {
-  @override
-  bool get _usePermissiveMode => true;
-}
-
-/// Tests of the provisional API, where the driver is reset between calls to
-/// `prepareInput` and `processInput`, ensuring that the migration algorithm
-/// sees different AST and element objects during different phases.
-@reflectiveTest
-class _ProvisionalApiTestWithReset extends _ProvisionalApiTestBase
-    with _ProvisionalApiTestCases {
-  @override
-  bool get _usePermissiveMode => false;
-
-  @override
-  void _betweenStages() {
-    driver!.clearLibraryContext();
-  }
-}
diff --git a/pkg/nnbd_migration/test/api_test_base.dart b/pkg/nnbd_migration/test/api_test_base.dart
deleted file mode 100644
index 61e59a080c69..000000000000
--- a/pkg/nnbd_migration/test/api_test_base.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer_plugin/protocol/protocol_common.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:test/test.dart';
-
-class TestMigrationListener implements NullabilityMigrationListener {
-  final edits = >{};
-
-  List details = [];
-
-  @override
-  void addEdit(Source source, SourceEdit edit) {
-    (edits[source] ??= []).add(edit);
-  }
-
-  @override
-  void addSuggestion(String descriptions, Location location) {}
-
-  @override
-  void reportException(
-      Source? source, AstNode? node, Object exception, StackTrace stackTrace) {
-    fail('Exception reported: $exception\n$stackTrace');
-  }
-}
diff --git a/pkg/nnbd_migration/test/decorated_class_hierarchy_test.dart b/pkg/nnbd_migration/test/decorated_class_hierarchy_test.dart
deleted file mode 100644
index 15a4dcd63060..000000000000
--- a/pkg/nnbd_migration/test/decorated_class_hierarchy_test.dart
+++ /dev/null
@@ -1,182 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:nnbd_migration/src/decorated_class_hierarchy.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'migration_visitor_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(DecoratedClassHierarchyTest);
-  });
-}
-
-@reflectiveTest
-class DecoratedClassHierarchyTest extends MigrationVisitorTestBase {
-  late DecoratedClassHierarchy _hierarchy;
-
-  @override
-  Future analyze(String code) async {
-    var unit = await super.analyze(code);
-    _hierarchy = DecoratedClassHierarchy(variables, graph);
-    return unit;
-  }
-
-  Future test_asInstanceOf_complex() async {
-    await analyze('''
-class Base {}
-class Derived extends Base> {}
-Derived x;
-''');
-    var decoratedType = decoratedTypeAnnotation('Derived');
-    var asInstanceOfBase =
-        _hierarchy.asInstanceOf(decoratedType, findElement.class_('Base'));
-    _assertType(asInstanceOfBase.type!, 'Base>');
-    expect(asInstanceOfBase.node, same(decoratedType.node));
-    var listOfUType = decoratedTypeAnnotation('List');
-    expect(asInstanceOfBase.typeArguments[0]!.node, same(listOfUType.node));
-    var substitution = asInstanceOfBase.typeArguments[0]!.typeArguments[0]!.node
-        as NullabilityNodeForSubstitution;
-    expect(substitution.innerNode, same(decoratedType.typeArguments[0]!.node));
-    expect(substitution.outerNode, same(listOfUType.typeArguments[0]!.node));
-  }
-
-  Future test_getDecoratedSupertype_complex() async {
-    await analyze('''
-class Base {}
-class Intermediate extends Base> {}
-class Derived extends Intermediate> {}
-''');
-    var decoratedSupertype = _hierarchy.getDecoratedSupertype(
-        findElement.class_('Derived'), findElement.class_('Base'));
-    var listRef = decoratedTypeAnnotation('List');
-    var uRef = decoratedTypeAnnotation('U>>');
-    var mapRef = decoratedTypeAnnotation('Map');
-    var intRef = decoratedTypeAnnotation('int');
-    var vRef = decoratedTypeAnnotation('V>>');
-    _assertType(decoratedSupertype.type!, 'Base>>');
-    expect(decoratedSupertype.node, same(never));
-    var baseArgs = decoratedSupertype.typeArguments;
-    expect(baseArgs, hasLength(1));
-    _assertType(baseArgs[0]!.type!, 'List>');
-    expect(baseArgs[0]!.node, same(listRef.node));
-    var listArgs = baseArgs[0]!.typeArguments;
-    expect(listArgs, hasLength(1));
-    _assertType(listArgs[0]!.type!, 'Map');
-    var mapNode = listArgs[0]!.node as NullabilityNodeForSubstitution;
-    expect(mapNode.innerNode, same(mapRef.node));
-    expect(mapNode.outerNode, same(uRef.node));
-    var mapArgs = listArgs[0]!.typeArguments;
-    expect(mapArgs, hasLength(2));
-    _assertType(mapArgs[0]!.type!, 'int');
-    expect(mapArgs[0]!.node, same(intRef.node));
-    _assertType(mapArgs[1]!.type!, 'V');
-    expect(mapArgs[1]!.node, same(vRef.node));
-  }
-
-  Future test_getDecoratedSupertype_extends_simple() async {
-    await analyze('''
-class Base {}
-class Derived extends Base {}
-''');
-    var decoratedSupertype = _hierarchy.getDecoratedSupertype(
-        findElement.class_('Derived'), findElement.class_('Base'));
-    var vRef = decoratedTypeAnnotation('V, W> {');
-    var wRef = decoratedTypeAnnotation('W> {');
-    _assertType(decoratedSupertype.type!, 'Base');
-    expect(decoratedSupertype.node, same(never));
-    expect(decoratedSupertype.typeArguments, hasLength(2));
-    _assertType(decoratedSupertype.typeArguments[0]!.type!, 'V');
-    expect(decoratedSupertype.typeArguments[0]!.node, same(vRef.node));
-    _assertType(decoratedSupertype.typeArguments[1]!.type!, 'W');
-    expect(decoratedSupertype.typeArguments[1]!.node, same(wRef.node));
-  }
-
-  Future test_getDecoratedSupertype_implements_simple() async {
-    await analyze('''
-class Base {}
-class Derived implements Base {}
-''');
-    var decoratedSupertype = _hierarchy.getDecoratedSupertype(
-        findElement.class_('Derived'), findElement.class_('Base'));
-    var vRef = decoratedTypeAnnotation('V, W> {');
-    var wRef = decoratedTypeAnnotation('W> {');
-    _assertType(decoratedSupertype.type!, 'Base');
-    expect(decoratedSupertype.node, same(never));
-    expect(decoratedSupertype.typeArguments, hasLength(2));
-    _assertType(decoratedSupertype.typeArguments[0]!.type!, 'V');
-    expect(decoratedSupertype.typeArguments[0]!.node, same(vRef.node));
-    _assertType(decoratedSupertype.typeArguments[1]!.type!, 'W');
-    expect(decoratedSupertype.typeArguments[1]!.node, same(wRef.node));
-  }
-
-  Future test_getDecoratedSupertype_not_generic() async {
-    await analyze('''
-class Base {}
-class Derived extends Base {}
-''');
-    var decoratedSupertype = _hierarchy.getDecoratedSupertype(
-        findElement.class_('Derived'), findElement.class_('Base'));
-    _assertType(decoratedSupertype.type!, 'Base');
-    expect(decoratedSupertype.node, same(never));
-    expect(decoratedSupertype.typeArguments, isEmpty);
-  }
-
-  Future test_getDecoratedSupertype_on_simple() async {
-    await analyze('''
-class Base {}
-mixin Derived on Base {}
-''');
-    var decoratedSupertype = _hierarchy.getDecoratedSupertype(
-        findElement.mixin('Derived'), findElement.class_('Base'));
-    var vRef = decoratedTypeAnnotation('V, W> {');
-    var wRef = decoratedTypeAnnotation('W> {');
-    _assertType(decoratedSupertype.type!, 'Base');
-    expect(decoratedSupertype.node, same(never));
-    expect(decoratedSupertype.typeArguments, hasLength(2));
-    _assertType(decoratedSupertype.typeArguments[0]!.type!, 'V');
-    expect(decoratedSupertype.typeArguments[0]!.node, same(vRef.node));
-    _assertType(decoratedSupertype.typeArguments[1]!.type!, 'W');
-    expect(decoratedSupertype.typeArguments[1]!.node, same(wRef.node));
-  }
-
-  Future test_getDecoratedSupertype_unrelated_type() async {
-    await analyze('''
-class A {}
-class B {}
-''');
-    expect(
-        () => _hierarchy.getDecoratedSupertype(
-            findElement.class_('A'), findElement.class_('B')),
-        throwsA(TypeMatcher()));
-  }
-
-  Future test_getDecoratedSupertype_with_simple() async {
-    await analyze('''
-class Base {}
-class Derived extends Object with Base {}
-''');
-    var decoratedSupertype = _hierarchy.getDecoratedSupertype(
-        findElement.class_('Derived'), findElement.class_('Base'));
-    var vRef = decoratedTypeAnnotation('V, W> {');
-    var wRef = decoratedTypeAnnotation('W> {');
-    _assertType(decoratedSupertype.type!, 'Base');
-    expect(decoratedSupertype.node, same(never));
-    expect(decoratedSupertype.typeArguments, hasLength(2));
-    _assertType(decoratedSupertype.typeArguments[0]!.type!, 'V');
-    expect(decoratedSupertype.typeArguments[0]!.node, same(vRef.node));
-    _assertType(decoratedSupertype.typeArguments[1]!.type!, 'W');
-    expect(decoratedSupertype.typeArguments[1]!.node, same(wRef.node));
-  }
-
-  void _assertType(DartType type, String expected) {
-    var typeStr = type.getDisplayString(withNullability: false);
-    expect(typeStr, expected);
-  }
-}
diff --git a/pkg/nnbd_migration/test/decorated_type_test.dart b/pkg/nnbd_migration/test/decorated_type_test.dart
deleted file mode 100644
index c98109201aa1..000000000000
--- a/pkg/nnbd_migration/test/decorated_type_test.dart
+++ /dev/null
@@ -1,636 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:analyzer/src/generated/element_type_provider.dart';
-import 'package:analyzer/src/generated/testing/test_type_provider.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:nnbd_migration/src/variables.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'migration_visitor_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(DecoratedTypeTest);
-  });
-}
-
-@reflectiveTest
-class DecoratedTypeTest extends Object
-    with DecoratedTypeTester
-    implements DecoratedTypeTesterBase {
-  final NullabilityGraph graph;
-
-  final TypeProvider typeProvider;
-
-  final Variables _variables;
-
-  final _ElementTypeProvider _elementTypeProvider;
-
-  @override
-  final decoratedTypeParameterBounds = DecoratedTypeParameterBounds();
-
-  // ignore: unreachable_from_main
-  factory DecoratedTypeTest() {
-    var typeProvider = TestTypeProvider();
-    var graph = NullabilityGraph();
-    var variables = Variables(graph, typeProvider);
-    return DecoratedTypeTest._(graph, typeProvider, variables);
-  }
-
-  DecoratedTypeTest._(this.graph, this.typeProvider, this._variables)
-      : _elementTypeProvider = _ElementTypeProvider(_variables);
-
-  NullabilityNode get always => graph.always;
-
-  void assertDartType(DartType type, String expected) {
-    // Note: by default DartType.getDisplayString doesn't print nullability
-    // suffixes, so we have to override that behavior in order to make sure the
-    // nullability suffixes are correct.
-    expect(type.getDisplayString(withNullability: true), expected);
-  }
-
-  void setUp() {
-    DecoratedTypeParameterBounds.current = decoratedTypeParameterBounds;
-    ElementTypeProvider.current = _elementTypeProvider;
-  }
-
-  void tearDown() {
-    DecoratedTypeParameterBounds.current = null;
-    ElementTypeProvider.current = const ElementTypeProvider();
-  }
-
-  void test_equal_dynamic_and_void() {
-    expect(dynamic_ == dynamic_, isTrue);
-    expect(dynamic_ == void_, isFalse);
-    expect(void_ == dynamic_, isFalse);
-    expect(void_ == void_, isTrue);
-  }
-
-  void test_equal_functionType_different_nodes() {
-    var returnType = int_();
-    expect(
-        function(returnType, node: newNode()) ==
-            function(returnType, node: newNode()),
-        isFalse);
-  }
-
-  void test_equal_functionType_named_different_names() {
-    var node = newNode();
-    var argType = int_();
-    expect(
-        function(dynamic_, named: {'x': argType}, node: node) ==
-            function(dynamic_, named: {'y': argType}, node: node),
-        isFalse);
-  }
-
-  void test_equal_functionType_named_different_types() {
-    var node = newNode();
-    expect(
-        function(dynamic_, named: {'x': int_()}, node: node) ==
-            function(dynamic_, named: {'x': int_()}, node: node),
-        isFalse);
-  }
-
-  void test_equal_functionType_named_extra() {
-    var node = newNode();
-    var argType = int_();
-    var t1 = function(dynamic_, named: {'x': argType}, node: node);
-    var t2 = function(dynamic_, node: node);
-    expect(t1 == t2, isFalse);
-    expect(t2 == t1, isFalse);
-  }
-
-  void test_equal_functionType_named_same() {
-    var node = newNode();
-    var argType = int_();
-    expect(
-        function(dynamic_, named: {'x': argType}, node: node) ==
-            function(dynamic_, named: {'x': argType}, node: node),
-        isTrue);
-  }
-
-  void test_equal_functionType_positional_different() {
-    var node = newNode();
-    expect(
-        function(dynamic_, positional: [int_()], node: node) ==
-            function(dynamic_, positional: [int_()], node: node),
-        isFalse);
-  }
-
-  void test_equal_functionType_positional_same() {
-    var node = newNode();
-    var argType = int_();
-    expect(
-        function(dynamic_, positional: [argType], node: node) ==
-            function(dynamic_, positional: [argType], node: node),
-        isTrue);
-  }
-
-  void test_equal_functionType_required_different() {
-    var node = newNode();
-    expect(
-        function(dynamic_, required: [int_()], node: node) ==
-            function(dynamic_, required: [int_()], node: node),
-        isFalse);
-  }
-
-  void test_equal_functionType_required_same() {
-    var node = newNode();
-    var argType = int_();
-    expect(
-        function(dynamic_, required: [argType], node: node) ==
-            function(dynamic_, required: [argType], node: node),
-        isTrue);
-  }
-
-  void test_equal_functionType_required_vs_positional() {
-    var node = newNode();
-    var argType = int_();
-    expect(
-        function(dynamic_, required: [argType], node: node) ==
-            function(dynamic_, positional: [argType], node: node),
-        isFalse);
-  }
-
-  void test_equal_functionType_return_different() {
-    var node = newNode();
-    expect(
-        function(int_(), node: node) == function(int_(), node: node), isFalse);
-  }
-
-  void test_equal_functionType_return_same() {
-    var node = newNode();
-    var returnType = int_();
-    expect(function(returnType, node: node) == function(returnType, node: node),
-        isTrue);
-  }
-
-  void test_equal_functionType_typeFormals_different_bounds() {
-    var n1 = newNode();
-    var n2 = newNode();
-    var t = typeParameter('T', object());
-    var u = typeParameter('U', int_());
-    expect(
-        function(typeParameterType(t, node: n1), typeFormals: [t], node: n2) ==
-            function(typeParameterType(u, node: n1),
-                typeFormals: [u], node: n2),
-        isFalse);
-  }
-
-  void
-      test_equal_functionType_typeFormals_equivalent_bounds_after_substitution() {
-    var n1 = newNode();
-    var n2 = newNode();
-    var n3 = newNode();
-    var n4 = newNode();
-    var bound = object();
-    var t = typeParameter('T', bound);
-    var u = typeParameter('U', typeParameterType(t, node: n1));
-    var v = typeParameter('V', bound);
-    var w = typeParameter('W', typeParameterType(v, node: n1));
-    expect(
-        function(void_,
-                typeFormals: [t, u],
-                required: [
-                  typeParameterType(t, node: n2),
-                  typeParameterType(u, node: n3)
-                ],
-                node: n4) ==
-            function(void_,
-                typeFormals: [v, w],
-                required: [
-                  typeParameterType(v, node: n2),
-                  typeParameterType(w, node: n3)
-                ],
-                node: n4),
-        isTrue);
-  }
-
-  void test_equal_functionType_typeFormals_same_bounds_named() {
-    var n1 = newNode();
-    var n2 = newNode();
-    var bound = object();
-    var t = typeParameter('T', bound);
-    var u = typeParameter('U', bound);
-    expect(
-        function(void_,
-                typeFormals: [t],
-                named: {'x': typeParameterType(t, node: n1)},
-                node: n2) ==
-            function(void_,
-                typeFormals: [u],
-                named: {'x': typeParameterType(u, node: n1)},
-                node: n2),
-        isTrue);
-  }
-
-  void test_equal_functionType_typeFormals_same_bounds_positional() {
-    var n1 = newNode();
-    var n2 = newNode();
-    var bound = object();
-    var t = typeParameter('T', bound);
-    var u = typeParameter('U', bound);
-    expect(
-        function(void_,
-                typeFormals: [t],
-                positional: [typeParameterType(t, node: n1)],
-                node: n2) ==
-            function(void_,
-                typeFormals: [u],
-                positional: [typeParameterType(u, node: n1)],
-                node: n2),
-        isTrue);
-  }
-
-  void test_equal_functionType_typeFormals_same_bounds_required() {
-    var n1 = newNode();
-    var n2 = newNode();
-    var bound = object();
-    var t = typeParameter('T', bound);
-    var u = typeParameter('U', bound);
-    expect(
-        function(void_,
-                typeFormals: [t],
-                required: [typeParameterType(t, node: n1)],
-                node: n2) ==
-            function(void_,
-                typeFormals: [u],
-                required: [typeParameterType(u, node: n1)],
-                node: n2),
-        isTrue);
-  }
-
-  void test_equal_functionType_typeFormals_same_bounds_return() {
-    var n1 = newNode();
-    var n2 = newNode();
-    var bound = object();
-    var t = typeParameter('T', bound);
-    var u = typeParameter('U', bound);
-    expect(
-        function(typeParameterType(t, node: n1), typeFormals: [t], node: n2) ==
-            function(typeParameterType(u, node: n1),
-                typeFormals: [u], node: n2),
-        isTrue);
-  }
-
-  void test_equal_functionType_typeFormals_same_parameters() {
-    var n1 = newNode();
-    var n2 = newNode();
-    var t = typeParameter('T', object());
-    expect(
-        function(typeParameterType(t, node: n1), typeFormals: [t], node: n2) ==
-            function(typeParameterType(t, node: n1),
-                typeFormals: [t], node: n2),
-        isTrue);
-  }
-
-  void test_equal_interfaceType_different_args() {
-    var node = newNode();
-    expect(list(int_(), node: node) == list(int_(), node: node), isFalse);
-  }
-
-  void test_equal_interfaceType_different_classes() {
-    var node = newNode();
-    expect(int_(node: node) == object(node: node), isFalse);
-  }
-
-  void test_equal_interfaceType_different_nodes() {
-    expect(int_() == int_(), isFalse);
-  }
-
-  void test_equal_interfaceType_same() {
-    var node = newNode();
-    expect(int_(node: node) == int_(node: node), isTrue);
-  }
-
-  void test_equal_interfaceType_same_generic() {
-    var argType = int_();
-    var node = newNode();
-    expect(list(argType, node: node) == list(argType, node: node), isTrue);
-  }
-
-  void test_toFinalType_bottom_non_nullable() {
-    var type =
-        _variables.toFinalType(DecoratedType(NeverTypeImpl.instance, never));
-    assertDartType(type, 'Never');
-  }
-
-  void test_toFinalType_bottom_nullable() {
-    var type =
-        _variables.toFinalType(DecoratedType(NeverTypeImpl.instance, always));
-    assertDartType(type, 'Null');
-  }
-
-  void test_toFinalType_dynamic() {
-    var type = _variables.toFinalType(dynamic_);
-    assertDartType(type, 'dynamic');
-  }
-
-  void test_toFinalType_function_generic_bound_dynamic() {
-    var t = typeParameter('T', dynamic_);
-    var type = _variables.toFinalType(
-        function(dynamic_, typeFormals: [t], node: never)) as FunctionType;
-    assertDartType(type, 'dynamic Function()');
-    assertDartType(
-        _elementTypeProvider.getTypeParameterBound(type.typeFormals[0])!,
-        'dynamic');
-  }
-
-  void test_toFinalType_function_generic_bound_num_question() {
-    var t = typeParameter('T', num_(node: always));
-    var type = _variables.toFinalType(
-        function(dynamic_, typeFormals: [t], node: never)) as FunctionType;
-    assertDartType(type, 'dynamic Function()');
-    assertDartType(
-        _elementTypeProvider.getTypeParameterBound(type.typeFormals[0])!,
-        'num?');
-  }
-
-  void test_toFinalType_function_generic_bound_object_question() {
-    var t = typeParameter('T', object(node: always));
-    var type = _variables.toFinalType(
-        function(dynamic_, typeFormals: [t], node: never)) as FunctionType;
-    assertDartType(type, 'dynamic Function()');
-    assertDartType(
-        _elementTypeProvider.getTypeParameterBound(type.typeFormals[0])!,
-        'Object?');
-  }
-
-  void test_toFinalType_function_generic_substitute_bounds() {
-    var u = typeParameter('U', object(node: never));
-    var t = typeParameter(
-        'T', list(typeParameterType(u, node: never), node: never));
-    var v = typeParameter(
-        'V', list(typeParameterType(u, node: never), node: never));
-    var type = _variables.toFinalType(
-            function(dynamic_, typeFormals: [t, u, v], node: never))
-        as FunctionType;
-    assertDartType(
-        type,
-        'dynamic Function, U extends Object, '
-        'V extends List>()');
-    expect(type.typeFormals[0], same(t));
-    expect(type.typeFormals[1], same(u));
-    expect(type.typeFormals[2], same(v));
-    expect(
-        ((type.typeFormals[0].bound as InterfaceType).typeArguments[0]
-                as TypeParameterType)
-            .element,
-        same(type.typeFormals[1]));
-    expect(
-        ((type.typeFormals[2].bound as InterfaceType).typeArguments[0]
-                as TypeParameterType)
-            .element,
-        same(type.typeFormals[1]));
-  }
-
-  void test_toFinalType_function_generic_substitute_named() {
-    var t = typeParameter('T', object(node: never));
-    var type = _variables.toFinalType(function(dynamic_,
-        typeFormals: [t],
-        named: {'x': list(typeParameterType(t, node: never), node: never)},
-        node: never)) as FunctionType;
-    assertDartType(type, 'dynamic Function({List x})');
-    expect(type.typeFormals[0], same(t));
-    expect(
-        ((type.parameters[0].type as InterfaceType).typeArguments[0]
-                as TypeParameterType)
-            .element,
-        same(type.typeFormals[0]));
-  }
-
-  void test_toFinalType_function_generic_substitute_optional() {
-    var t = typeParameter('T', object(node: never));
-    var type = _variables.toFinalType(function(dynamic_,
-        typeFormals: [t],
-        positional: [list(typeParameterType(t, node: never), node: never)],
-        node: never)) as FunctionType;
-    assertDartType(type, 'dynamic Function([List])');
-    expect(type.typeFormals[0], same(t));
-    expect(
-        ((type.parameters[0].type as InterfaceType).typeArguments[0]
-                as TypeParameterType)
-            .element,
-        same(type.typeFormals[0]));
-  }
-
-  void test_toFinalType_function_generic_substitute_required() {
-    var t = typeParameter('T', object());
-    var type = _variables.toFinalType(function(dynamic_,
-        typeFormals: [t],
-        required: [list(typeParameterType(t, node: never), node: never)],
-        node: never)) as FunctionType;
-    assertDartType(type, 'dynamic Function(List)');
-    expect(type.typeFormals[0], same(t));
-    expect(
-        ((type.parameters[0].type as InterfaceType).typeArguments[0]
-                as TypeParameterType)
-            .element,
-        same(type.typeFormals[0]));
-  }
-
-  void test_toFinalType_function_generic_substitute_return_type() {
-    var t = typeParameter('T', object(node: never));
-    var type = _variables.toFinalType(function(
-        list(typeParameterType(t, node: never), node: never),
-        typeFormals: [t],
-        node: never)) as FunctionType;
-    assertDartType(type, 'List Function()');
-    expect(type.typeFormals[0], same(t));
-    expect(
-        ((type.returnType as InterfaceType).typeArguments[0]
-                as TypeParameterType)
-            .element,
-        same(type.typeFormals[0]));
-  }
-
-  void test_toFinalType_function_named_parameter_non_nullable() {
-    var xType = int_(node: never);
-    var type = _variables
-        .toFinalType(function(dynamic_, named: {'x': xType}, node: never));
-    assertDartType(type, 'dynamic Function({int x})');
-  }
-
-  void test_toFinalType_function_named_parameter_nullable() {
-    var xType = int_(node: always);
-    var type = _variables
-        .toFinalType(function(dynamic_, named: {'x': xType}, node: never));
-    assertDartType(type, 'dynamic Function({int? x})');
-  }
-
-  void test_toFinalType_function_non_nullable() {
-    var type = _variables.toFinalType(function(dynamic_, node: never));
-    assertDartType(type, 'dynamic Function()');
-  }
-
-  void test_toFinalType_function_nullable() {
-    var type = _variables.toFinalType(function(dynamic_, node: always));
-    assertDartType(type, 'dynamic Function()?');
-  }
-
-  void test_toFinalType_function_optional_parameter_non_nullable() {
-    var argType = int_(node: never);
-    var type = _variables
-        .toFinalType(function(dynamic_, positional: [argType], node: never));
-    assertDartType(type, 'dynamic Function([int])');
-  }
-
-  void test_toFinalType_function_optional_parameter_nullable() {
-    var argType = int_(node: always);
-    var type = _variables
-        .toFinalType(function(dynamic_, positional: [argType], node: never));
-    assertDartType(type, 'dynamic Function([int?])');
-  }
-
-  void test_toFinalType_function_required_parameter_non_nullable() {
-    var argType = int_(node: never);
-    var type = _variables
-        .toFinalType(function(dynamic_, required: [argType], node: never));
-    assertDartType(type, 'dynamic Function(int)');
-  }
-
-  void test_toFinalType_function_required_parameter_nullable() {
-    var argType = int_(node: always);
-    var type = _variables
-        .toFinalType(function(dynamic_, required: [argType], node: never));
-    assertDartType(type, 'dynamic Function(int?)');
-  }
-
-  void test_toFinalType_function_return_type_non_nullable() {
-    var returnType = int_(node: never);
-    var type = _variables.toFinalType(function(returnType, node: never));
-    assertDartType(type, 'int Function()');
-  }
-
-  void test_toFinalType_function_return_type_nullable() {
-    var returnType = int_(node: always);
-    var type = _variables.toFinalType(function(returnType, node: never));
-    assertDartType(type, 'int? Function()');
-  }
-
-  void test_toFinalType_interface_non_nullable() {
-    var type = _variables.toFinalType(int_(node: never));
-    assertDartType(type, 'int');
-  }
-
-  void test_toFinalType_interface_nullable() {
-    var type = _variables.toFinalType(int_(node: always));
-    assertDartType(type, 'int?');
-  }
-
-  void test_toFinalType_interface_type_argument_non_nullable() {
-    var argType = int_(node: never);
-    var type = _variables.toFinalType(list(argType, node: never));
-    assertDartType(type, 'List');
-  }
-
-  void test_toFinalType_interface_type_argument_nullable() {
-    var argType = int_(node: always);
-    var type = _variables.toFinalType(list(argType, node: never));
-    assertDartType(type, 'List');
-  }
-
-  void test_toFinalType_null_non_nullable() {
-    // We never change explicit `Null` types to `Never`, even if we can't find
-    // any reason they need to be nullable.
-    var type = _variables.toFinalType(DecoratedType(null_.type, never));
-    assertDartType(type, 'Null');
-  }
-
-  void test_toFinalType_null_nullable() {
-    var type = _variables.toFinalType(DecoratedType(null_.type, always));
-    assertDartType(type, 'Null');
-  }
-
-  void test_toFinalType_typeParameter_non_nullable() {
-    var t = typeParameter('T', object(node: never));
-    var type = _variables.toFinalType(typeParameterType(t, node: never));
-    expect(type, TypeMatcher());
-    assertDartType(type, 'T');
-  }
-
-  void test_toFinalType_typeParameter_nullable() {
-    var t = typeParameter('T', object(node: never));
-    var type = _variables.toFinalType(typeParameterType(t, node: always));
-    expect(type, TypeMatcher());
-    assertDartType(type, 'T?');
-  }
-
-  void test_toFinalType_void() {
-    var type = _variables.toFinalType(void_);
-    assertDartType(type, 'void');
-  }
-
-  void test_toString_bottom() {
-    var node = newNode();
-    var decoratedType = DecoratedType(NeverTypeImpl.instance, node);
-    expect(decoratedType.toString(), 'Never?($node)');
-  }
-
-  void test_toString_interface_type_argument() {
-    var argType = int_();
-    var decoratedType = list(argType, node: always);
-    expect(decoratedType.toString(), 'List<$argType>?');
-  }
-
-  void test_toString_named_parameter() {
-    var xType = int_();
-    var decoratedType = function(dynamic_, named: {'x': xType}, node: always);
-    expect(decoratedType.toString(), 'dynamic Function({x: $xType})?');
-  }
-
-  void test_toString_normal_and_named_parameter() {
-    var xType = int_();
-    var yType = int_();
-    var decoratedType = function(dynamic_,
-        required: [xType], named: {'y': yType}, node: always);
-    expect(decoratedType.toString(), 'dynamic Function($xType, {y: $yType})?');
-  }
-
-  void test_toString_normal_and_optional_parameter() {
-    var xType = int_();
-    var yType = int_();
-    var decoratedType = function(dynamic_,
-        required: [xType], positional: [yType], node: always);
-    expect(decoratedType.toString(), 'dynamic Function($xType, [$yType])?');
-  }
-
-  void test_toString_normal_parameter() {
-    var xType = int_();
-    var decoratedType = function(dynamic_, required: [xType], node: always);
-    expect(decoratedType.toString(), 'dynamic Function($xType)?');
-  }
-
-  void test_toString_optional_parameter() {
-    var xType = int_();
-    var decoratedType = function(dynamic_, positional: [xType], node: always);
-    expect(decoratedType.toString(), 'dynamic Function([$xType])?');
-  }
-}
-
-class _ElementTypeProvider extends ElementTypeProvider {
-  final Variables variables;
-
-  _ElementTypeProvider(this.variables);
-
-  void freshTypeParameterCreated(TypeParameterElement newTypeParameter,
-      TypeParameterElement oldTypeParameter) {
-    DecoratedTypeParameterBounds.current!.put(newTypeParameter,
-        DecoratedTypeParameterBounds.current!.get(oldTypeParameter));
-  }
-
-  DartType? getTypeParameterBound(TypeParameterElement element) {
-    var decoratedType = variables.decoratedTypeParameterBound(element,
-        allowNullUnparentedBounds: true);
-    if (decoratedType == null) return element.bound;
-    return variables.toFinalType(decoratedType);
-  }
-}
diff --git a/pkg/nnbd_migration/test/edge_builder_flow_analysis_test.dart b/pkg/nnbd_migration/test/edge_builder_flow_analysis_test.dart
deleted file mode 100644
index 2516cd95d0e3..000000000000
--- a/pkg/nnbd_migration/test/edge_builder_flow_analysis_test.dart
+++ /dev/null
@@ -1,1588 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'migration_visitor_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(EdgeBuilderFlowAnalysisTest);
-  });
-}
-
-@reflectiveTest
-class EdgeBuilderFlowAnalysisTest extends EdgeBuilderTestBase {
-  Future test_as() async {
-    await analyze('''
-void f(num n) {
-  h(n);
-  n as int;
-  g(n);
-}
-void g(int i) {}
-void h(num m) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var nNode = decoratedTypeAnnotation('num n').node;
-    var mNode = decoratedTypeAnnotation('num m').node;
-    // No edge from n to i because n is known to be non-nullable at the site of
-    // the call to g
-    assertNoEdge(nNode, iNode);
-    // But there is an edge from n to m.
-    assertEdge(nNode, mNode, hard: true);
-  }
-
-  Future test_assert_initializer_condition_promotes_to_message() async {
-    await analyze('''
-class C {
-  C(int i)
-      : assert(i == null, g(i)) {
-    h(i);
-  }
-}
-String g(int j) => 'foo';
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to j because i is known to be non-nullable at the site of
-    // the call to g
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to k.
-    assertEdge(iNode, kNode, hard: true);
-  }
-
-  Future test_assert_initializer_does_not_promote_beyond_assert() async {
-    await analyze('''
-class C {
-  C(int i)
-      : assert(i != null) {
-    g(i);
-    if (i == null) return;
-    h(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // There is an edge from i to j because i not promoted by the assert.
-    assertEdge(iNode, jNode, hard: true);
-    // But there is no edge from i to k.
-    assertNoEdge(iNode, kNode);
-  }
-
-  Future test_assert_statement_condition_promotes_to_message() async {
-    await analyze('''
-void f(int i) {
-  assert(i == null, g(i));
-  h(i);
-}
-String g(int j) => 'foo';
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to j because i is known to be non-nullable at the site of
-    // the call to g
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to k.
-    assertEdge(iNode, kNode, hard: true);
-  }
-
-  Future test_assert_statement_does_not_promote_beyond_assert() async {
-    await analyze('''
-void f(int i) {
-  assert(i != null);
-  g(i);
-  if (i == null) return;
-  h(i);
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // There is an edge from i to j because i not promoted by the assert.
-    assertEdge(iNode, jNode, hard: true);
-    // But there is no edge from i to k.
-    assertNoEdge(iNode, kNode);
-  }
-
-  Future test_assignmentExpression() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i != null) {
-    g(i);
-    i = j;
-    h(i);
-  }
-}
-void g(int k) {}
-void h(int l) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    var lNode = decoratedTypeAnnotation('int l').node;
-    // No edge from i to k because i's type is promoted to non-nullable
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to l, because it is after the assignment
-    assertEdge(iNode, lNode, hard: false);
-    // And there is an edge from j to i, because a null value of j would lead to
-    // a null value for i.
-    assertEdge(jNode, iNode, hard: false);
-  }
-
-  Future test_assignmentExpression_lhs_before_rhs() async {
-    await analyze('''
-void f(int i, List l) {
-  if (i != null) {
-    l[i = g(i)] = h(i);
-  }
-}
-int g(int j) => 1;
-int h(int k) => 1;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    var gReturnNode = decoratedTypeAnnotation('int g').node;
-    // No edge from i to j, because i's type is promoted before the call to g.
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to k, because the call to h happens after the
-    // assignment.
-    assertEdge(iNode, kNode, hard: false);
-    // And there is an edge from g's return type to i, due to the assignment.
-    assertEdge(gReturnNode, iNode, hard: false);
-  }
-
-  Future test_assignmentExpression_null_aware() async {
-    await analyze('''
-void f(bool b, int i, int j) {
-  if (b) {
-    j ??= i is int ? i : throw 'foo';
-    g(i);
-    j = i is int ? i : throw 'foo';
-    h(i);
-  }
-}
-void g(int k) {}
-void h(int l) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    var lNode = decoratedTypeAnnotation('int l').node;
-    // No edge from i to l because i's type is promoted to non-nullable
-    assertNoEdge(iNode, lNode);
-    // But there is an edge from i to k, because the RHS of the `??=` is not
-    // guaranteed to execute
-    assertEdge(iNode, kNode, hard: false);
-  }
-
-  Future test_assignmentExpression_write_after_rhs() async {
-    await analyze('''
-void f(int i) {
-  if (i != null) {
-    i = g(i);
-    h(i);
-  }
-}
-int g(int j) => 1;
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    var gReturnNode = decoratedTypeAnnotation('int g').node;
-    // No edge from i to j because i's type is promoted before the call to g.
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to k, because the call to h happens after the
-    // assignment.
-    assertEdge(iNode, kNode, hard: false);
-    // And there is an edge from g's return type to i, due to the assignment.
-    assertEdge(gReturnNode, iNode, hard: false);
-  }
-
-  Future test_binaryExpression_ampersandAmpersand_left() async {
-    await analyze('''
-bool f(int i) => i != null && i.isEven;
-bool g(int j) => j.isEven;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: true);
-  }
-
-  Future test_binaryExpression_ampersandAmpersand_right() async {
-    await analyze('''
-void f(bool b, int i, int j) {
-  if (b && i != null) {
-    print(i.isEven);
-    print(j.isEven);
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_binaryExpression_barBar_left() async {
-    await analyze('''
-bool f(int i) => i == null || i.isEven;
-bool g(int j) => j.isEven;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: true);
-  }
-
-  Future test_binaryExpression_barBar_right() async {
-    await analyze('''
-void f(bool b, int i, int j) {
-  if (b || i == null) {} else {
-    print(i.isEven);
-    print(j.isEven);
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_booleanLiteral_false() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i != null || false) {} else return;
-  if (j != null || true) {} else return;
-  i.isEven;
-  j.isEven;
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never i is known to be non-nullable at the site of
-    // the call to i.isEven
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_booleanLiteral_true() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null && true) return;
-  if (j == null && false) return;
-  i.isEven;
-  j.isEven;
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never i is known to be non-nullable at the site of
-    // the call to i.isEven
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_break_labeled() async {
-    await analyze('''
-void f(int i) {
-  L: while(true) {
-    while (b()) {
-      if (i != null) break L;
-    }
-    g(i);
-  }
-  h(i);
-}
-bool b() => true;
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_break_unlabeled() async {
-    await analyze('''
-void f(int i) {
-  while (true) {
-    if (i != null) break;
-    g(i);
-  }
-  h(i);
-}
-bool b() => true;
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future
-      test_catch_cancels_promotions_based_on_assignments_in_body() async {
-    await analyze('''
-void f(int i) {
-  if (i == null) return;
-  try {
-    g(i);
-    i = null;
-    if (i == null) return;
-    g(i);
-  } catch (_) {
-    h(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to j because i is promoted at the time of both calls to g.
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to k, because there is no guarantee that i is
-    // promoted at all times during the execution of the try block.
-    assertEdge(iNode, kNode, hard: false);
-  }
-
-  Future test_catch_falls_through_to_after_try() async {
-    await analyze('''
-void f(int i) {
-  try {
-    g(i);
-    return;
-  } catch (_) {
-    if (i == null) return;
-  }
-  h(i);
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i's type is promoted to non-nullable
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j.
-    assertEdge(iNode, jNode, hard: true);
-  }
-
-  Future test_catch_resets_to_state_before_try() async {
-    await analyze('''
-void f(int i) {
-  try {
-    if (i == null) return;
-    g(i);
-  } catch (_) {
-    h(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to j because i's type is promoted to non-nullable
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to k, since we assume an exception might
-    // occur at any time during the body of the try.
-    assertEdge(iNode, kNode, hard: false);
-  }
-
-  Future test_conditionalExpression() async {
-    await analyze('''
-int f(int i, int l) => i == null ? g(l) : h(i);
-int g(int j) => 1;
-int h(int k) => 1;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    var lNode = decoratedTypeAnnotation('int l').node;
-    // No edge from i to k because i is known to be non-nullable at the site of
-    // the call to h()
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from l to j
-    assertEdge(lNode, jNode, hard: false, guards: [iNode]);
-  }
-
-  Future test_conditionalExpression_propagates_promotions() async {
-    await analyze('''
-void f(bool b, int i, int j, int k) {
-  if (b ? (i != null && j != null) : (i != null && k != null)) {
-    i.isEven;
-    j.isEven;
-    k.isEven;
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there are edges from j and k to never.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-    assertEdge(kNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_constructorDeclaration_assert() async {
-    await analyze('''
-class C {
-  C(int i, int j) : assert(i == null || i.isEven, j.isEven);
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: true);
-  }
-
-  Future test_constructorDeclaration_initializer() async {
-    await analyze('''
-class C {
-  bool b1;
-  bool b2;
-  C(int i, int j) : b1 = i == null || i.isEven, b2 = j.isEven;
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: true);
-  }
-
-  Future test_constructorDeclaration_redirection() async {
-    await analyze('''
-class C {
-  C(bool b1, bool b2);
-  C.redirect(int i, int j) : this(i == null || i.isEven, j.isEven);
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: true);
-  }
-
-  Future test_continue_labeled() async {
-    await analyze('''
-void f(int i) {
-  L: do {
-    do {
-      if (i != null) continue L;
-    } while (g(i));
-    break;
-  } while (h(i));
-}
-bool g(int j) => true;
-bool h(int k) => true;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_continue_unlabeled() async {
-    await analyze('''
-void f(int i) {
-  do {
-    if (i != null) continue;
-    h(i);
-    break;
-  } while (g(i));
-}
-bool g(int j) => true;
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to j because i is promoted at the time of the call to g.
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to h.
-    assertEdge(iNode, kNode, hard: false);
-  }
-
-  Future test_do_break_target() async {
-    await analyze('''
-void f(int i) {
-  L: do {
-    do {
-      if (i != null) break L;
-      if (b()) break;
-    } while (true);
-    g(i);
-  } while (true);
-  h(i);
-}
-bool b() => true;
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_do_cancels_promotions_for_assignments_in_body() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  if (j == null) return;
-  do {
-    i.isEven;
-    j.isEven;
-    j = null;
-  } while (true);
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_do_cancels_promotions_for_assignments_in_condition() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  if (j == null) return;
-  do {} while (i.isEven && j.isEven && g(j = null));
-}
-bool g(int k) => true;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_do_continue_target() async {
-    await analyze('''
-void f(int i) {
-  L: do {
-    do {
-      if (i != null) continue L;
-      g(i);
-    } while (true);
-  } while (h(i));
-}
-void g(int j) {}
-bool h(int k) => true;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_field_initializer() async {
-    await analyze('''
-bool b1 = true;
-bool b2 = true;
-class C {
-  bool b = b1 || b2;
-}
-''');
-    // No assertions; we just want to verify that the presence of `||` inside a
-    // field doesn't cause flow analysis to crash.
-  }
-
-  Future test_finally_promotions_are_preserved() async {
-    await analyze('''
-void f(int i) {
-  try {
-    g(i);
-  } finally {
-    if (i == null) return;
-  }
-  h(i);
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i's type is promoted to non-nullable in the
-    // finally block.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j.
-    assertEdge(iNode, jNode, hard: true);
-  }
-
-  Future test_finally_temporarily_resets_to_state_before_try() async {
-    await analyze('''
-void f(int i) {
-  try {
-    if (i == null) return;
-    g(i);
-  } finally {
-    h(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to j because i's type is promoted to non-nullable in the
-    // try-block.
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to k, since we assume an exception might
-    // occur at any time during the body of the try.
-    assertEdge(iNode, kNode, hard: false);
-  }
-
-  Future test_for_break_target() async {
-    await analyze('''
-void f(int i) {
-  L: for (;;) {
-    for (;;) {
-      if (i != null) break L;
-      if (b()) break;
-    }
-    g(i);
-  }
-  h(i);
-}
-bool b() => true;
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_for_cancels_promotions_for_assignments_in_body() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  if (j == null) return;
-  for (;;) {
-    i.isEven;
-    j.isEven;
-    j = null;
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_for_cancels_promotions_for_assignments_in_updaters() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  if (j == null) return;
-  for (;; j = null) {
-    i.isEven;
-    j.isEven;
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future
-      test_for_collection_cancels_promotions_for_assignments_in_body() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  if (j == null) return;
-  [for (;;) [i.isEven, j.isEven, (j = null)]];
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future
-      test_for_collection_cancels_promotions_for_assignments_in_updaters() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  if (j == null) return;
-  [for (;; j = null) [i.isEven, j.isEven]];
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future
-      test_for_collection_preserves_promotions_for_assignments_in_initializer() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  [for(var v = h(i.isEven && j.isEven && g(i = null));;) null];
-}
-bool g(int k) => true;
-int h(bool b) => 0;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because it is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_for_continue_target() async {
-    await analyze('''
-void f(int i) {
-  L: for (; b(); h(i)) {
-    for (; b(); g(i)) {
-      if (i != null) continue L;
-    }
-    return;
-  }
-}
-bool b() => true;
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_for_each_assigns_to_declared_var() async {
-    await analyze('''
-void f(Iterable x) {
-  for (int i in x) {
-    g(i);
-  }
-}
-void g(int j) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    // No edge from never to i because it is assigned before it is used.
-    assertNoEdge(never, iNode);
-  }
-
-  Future test_for_each_assigns_to_identifier() async {
-    await analyze('''
-void f(Iterable x) {
-  int i;
-  for (i in x) {
-    g(i);
-  }
-}
-void g(int j) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    // No edge from never to i because it is assigned before it is used.
-    assertNoEdge(never, iNode);
-  }
-
-  Future
-      test_for_each_cancels_promotions_for_assignments_in_body() async {
-    await analyze('''
-void f(int i, int j, Iterable x) {
-  if (i == null) return;
-  if (j == null) return;
-  for (var v in x) {
-    i.isEven;
-    j.isEven;
-    j = null;
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_for_each_collection_assigns_to_declared_var() async {
-    await analyze('''
-void f(Iterable x) {
-  [for (int i in x) g(i)];
-}
-void g(int j) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    // No edge from never to i because it is assigned before it is used.
-    assertNoEdge(never, iNode);
-  }
-
-  Future test_for_each_collection_assigns_to_identifier() async {
-    await analyze('''
-void f(Iterable x) {
-  int i;
-  [for (i in x) g(i)];
-}
-void g(int j) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    // No edge from never to i because it is assigned before it is used.
-    assertNoEdge(never, iNode);
-  }
-
-  Future
-      test_for_each_collection_cancels_promotions_for_assignments_in_body() async {
-    await analyze('''
-void f(int i, int j, Iterable x) {
-  if (i == null) return;
-  if (j == null) return;
-  [for (var v in x) [i.isEven, j.isEven, (j = null)]];
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future
-      test_for_each_collection_preserves_promotions_for_assignments_in_iterable() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  [for(var v in h(i.isEven && j.isEven && g(i = null))) null];
-}
-bool g(int k) => true;
-Iterable h(bool b) => [];
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because it is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future
-      test_for_each_preserves_promotions_for_assignments_in_iterable() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  for(var v in h(i.isEven && j.isEven && g(i = null))) {}
-}
-bool g(int k) => true;
-Iterable h(bool b) => [];
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because it is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future
-      test_for_preserves_promotions_for_assignments_in_initializer() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  for(var v = h(i.isEven && j.isEven && g(i = null));;) {}
-}
-bool g(int k) => true;
-int h(bool b) => 0;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because it is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_function_withFormals() async {
-    await analyze('''
-void f(Function() f) {
-  if (f == null) return;
-  f();
-}
-''');
-    var fNode = decoratedGenericFunctionTypeAnnotation('Function() f').node;
-    // No edge to never because it had been promoted before invoked.
-    assertNoEdge(fNode, graph.never);
-  }
-
-  Future test_functionDeclaration() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  print(i.isEven);
-  print(j.isEven);
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_functionDeclaration_expression_body() async {
-    await analyze('''
-bool f(int i) => i == null || i.isEven;
-bool g(int j) => j.isEven;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: true);
-  }
-
-  Future
-      test_functionDeclaration_resets_unconditional_control_flow() async {
-    await analyze('''
-void _f(bool b, int i, int j) {
-  assert(i != null);
-  if (b) return;
-  assert(j != null);
-}
-void _g(int k) {
-  assert(k != null);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int j').node, never);
-    assertEdge(always, decoratedTypeAnnotation('int j').node, hard: false);
-    assertEdge(decoratedTypeAnnotation('int k').node, never, hard: true);
-  }
-
-  Future test_functionExpression_parameters() async {
-    await analyze('''
-void f() {
-  var g = (int i, int j) {
-    if (i == null) return;
-    print(i.isEven);
-    print(j.isEven);
-  };
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_if() async {
-    await analyze('''
-void f(int i) {
-  if (i == null) {
-    g(i);
-  } else {
-    h(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is known to be non-nullable at the site of
-    // the call to h()
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j
-    assertEdge(iNode, jNode, hard: false, guards: [iNode]);
-  }
-
-  Future test_if_without_else() async {
-    await analyze('''
-void f(int i) {
-  if (i == null) {
-    g(i);
-    return;
-  }
-  h(i);
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is known to be non-nullable at the site of
-    // the call to h()
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j
-    assertEdge(iNode, jNode, hard: false, guards: [iNode]);
-  }
-
-  Future test_ifNull() async {
-    await analyze('''
-void f(int i, int x) {
-  x ?? (i == null ? throw 'foo' : g(i));
-  h(i);
-}
-int g(int j) => 0;
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to j because i's type is promoted to non-nullable
-    assertNoEdge(iNode, jNode);
-    // But there is an edge from i to k, because the RHS of the `??` isn't
-    // guaranteed to execute.
-    assertEdge(iNode, kNode, hard: true);
-  }
-
-  Future test_is() async {
-    await analyze('''
-void f(num n) {
-  if (n is int) {
-    g(n);
-  }
-  h(n);
-}
-void g(int i) {}
-void h(num m) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var nNode = decoratedTypeAnnotation('num n').node;
-    var mNode = decoratedTypeAnnotation('num m').node;
-    // No edge from n to i because n is known to be non-nullable at the site of
-    // the call to g
-    assertNoEdge(nNode, iNode);
-    // But there is an edge from n to m.
-    assertEdge(nNode, mNode, hard: true);
-  }
-
-  Future test_is_not() async {
-    await analyze('''
-void f(num n) {
-  if (n is! int) {} else {
-    g(n);
-  }
-  h(n);
-}
-void g(int i) {}
-void h(num m) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var nNode = decoratedTypeAnnotation('num n').node;
-    var mNode = decoratedTypeAnnotation('num m').node;
-    // No edge from n to i because n is known to be non-nullable at the site of
-    // the call to g
-    assertNoEdge(nNode, iNode);
-    // But there is an edge from n to m.
-    assertEdge(nNode, mNode, hard: true);
-  }
-
-  Future test_local_function_parameters() async {
-    await analyze('''
-void f() {
-  void g(int i, int j) {
-    if (i == null) return;
-    print(i.isEven);
-    print(j.isEven);
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_not() async {
-    await analyze('''
-void f(int i) {
-  if (!(i == null)) {
-    h(i);
-  } else {
-    g(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is known to be non-nullable at the site of
-    // the call to h()
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_not_null_then_promote() async {
-    await analyze('''
-void f(dynamic n) {
-  if (n == null) {
-    return;
-  } else if (n is List) {
-    n.length; // Ensure this doesn't crash during method lookup.
-    g(n); // Test this is wired correctly in graph.
-  }
-}
-void g(List j) {}
-''');
-    var nNode = decoratedTypeAnnotation('dynamic n').node;
-    var jNode = decoratedTypeAnnotation('List j').node;
-    var jParamNode = decoratedTypeAnnotation('int> j').node;
-    var intParamNode = decoratedTypeAnnotation('int>)').node;
-    // No edge from n to g because i is known to be non-nullable at the site of
-    // the call to g()
-    assertNoEdge(nNode, jNode);
-    // But there is an edge from nonNull(List) to j
-    assertEdge(inSet(neverClosure), jNode, hard: false);
-    assertEdge(intParamNode, jParamNode, hard: false, checkable: false);
-  }
-
-  Future test_postfixDecrement() async {
-    await analyze('''
-void f(C c1) {
-  if (c1 != null) {
-    g(c1);
-    c1--;
-    h(c1);
-  }
-}
-void g(C c2) {}
-void h(C c3) {}
-class C {
-  C operator-(int i) => this;
-}
-''');
-    var c1Node = decoratedTypeAnnotation('C c1').node;
-    var c2Node = decoratedTypeAnnotation('C c2').node;
-    var c3Node = decoratedTypeAnnotation('C c3').node;
-    // No edge from c1 to c2 because c1's type is promoted to non-nullable
-    assertNoEdge(c1Node, c2Node);
-    // But there is an edge from c1 to c3, because the decrement un-does the
-    // promotion.
-    assertEdge(c1Node, c3Node, hard: false);
-  }
-
-  Future test_postfixIncrement() async {
-    await analyze('''
-void f(C c1) {
-  if (c1 != null) {
-    g(c1);
-    c1++;
-    h(c1);
-  }
-}
-void g(C c2) {}
-void h(C c3) {}
-class C {
-  C operator+(int i) => this;
-}
-''');
-    var c1Node = decoratedTypeAnnotation('C c1').node;
-    var c2Node = decoratedTypeAnnotation('C c2').node;
-    var c3Node = decoratedTypeAnnotation('C c3').node;
-    // No edge from c1 to c2 because c1's type is promoted to non-nullable
-    assertNoEdge(c1Node, c2Node);
-    // But there is an edge from c1 to c3, because the increment un-does the
-    // promotion.
-    assertEdge(c1Node, c3Node, hard: false);
-  }
-
-  Future test_prefixDecrement() async {
-    await analyze('''
-void f(C c1) {
-  if (c1 != null) {
-    g(c1);
-    --c1;
-    h(c1);
-  }
-}
-void g(C c2) {}
-void h(C c3) {}
-class C {
-  C operator-(int i) => this;
-}
-''');
-    var c1Node = decoratedTypeAnnotation('C c1').node;
-    var c2Node = decoratedTypeAnnotation('C c2').node;
-    var c3Node = decoratedTypeAnnotation('C c3').node;
-    // No edge from c1 to c2 because c1's type is promoted to non-nullable
-    assertNoEdge(c1Node, c2Node);
-    // But there is an edge from c1 to c3, because the decrement un-does the
-    // promotion.
-    assertEdge(c1Node, c3Node, hard: false);
-  }
-
-  Future test_prefixIncrement() async {
-    await analyze('''
-void f(C c1) {
-  if (c1 != null) {
-    g(c1);
-    ++c1;
-    h(c1);
-  }
-}
-void g(C c2) {}
-void h(C c3) {}
-class C {
-  C operator+(int i) => this;
-}
-''');
-    var c1Node = decoratedTypeAnnotation('C c1').node;
-    var c2Node = decoratedTypeAnnotation('C c2').node;
-    var c3Node = decoratedTypeAnnotation('C c3').node;
-    // No edge from c1 to c2 because c1's type is promoted to non-nullable
-    assertNoEdge(c1Node, c2Node);
-    // But there is an edge from c1 to c3, because the increment un-does the
-    // promotion.
-    assertEdge(c1Node, c3Node, hard: false);
-  }
-
-  Future test_rethrow() async {
-    await analyze('''
-void f(int i, int j) {
-  try {
-    g();
-  } catch (_) {
-    if (i == null) rethrow;
-    print(i.isEven);
-    print(j.isEven);
-  }
-}
-void g() {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_return() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  print(i.isEven);
-  print(j.isEven);
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_switch_break_target() async {
-    await analyze('''
-void f(int i, int x, int y) {
-  L: switch (x) {
-    default:
-      switch (y) {
-        default:
-          if (i != null) break L;
-          if (b()) break;
-          return;
-      }
-      g(i);
-      return;
-  }
-  h(i);
-}
-bool b() => true;
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_switch_cancels_promotions_for_labeled_cases() async {
-    await analyze('''
-void f(int i, int x, bool b) {
-  if (i == null) return;
-  switch (x) {
-    L:
-    case 1:
-      g(i);
-      break;
-    case 2:
-      h(i);
-      i = null;
-      if (b) continue L;
-      break;
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i's type is promoted to non-nullable at the
-    // time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_switch_default() async {
-    await analyze('''
-void f(int i, int j, int x, int y) {
-  if (i == null) {
-    switch (x) {
-      default: return;
-    }
-  }
-  if (j == null) {
-    switch (y) {
-      case 0: return;
-    }
-  }
-  i.isEven;
-  j.isEven;
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because the switch statement is guaranteed to
-    // complete by returning, so i is promoted to non-nullable.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never, because the switch statement is not
-    // guaranteed to complete by returning, so j is not promoted.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_throw() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) throw 'foo';
-  print(i.isEven);
-  print(j.isEven);
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to `never` because i's type is promoted to non-nullable
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to `never`.
-    assertEdge(jNode, inSet(pointsToNever), hard: true);
-  }
-
-  Future test_topLevelVar_initializer() async {
-    await analyze('''
-bool b1 = true;
-bool b2 = true;
-bool b3 = b1 || b2;
-''');
-    // No assertions; we just want to verify that the presence of `||` inside a
-    // top level variable doesn't cause flow analysis to crash.
-  }
-
-  Future test_try_falls_through_to_after_try() async {
-    await analyze('''
-void f(int i) {
-  try {
-    g(i);
-    if (i == null) return;
-  } catch (_) {
-    return;
-  }
-  h(i);
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i's type is promoted to non-nullable
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j.
-    assertEdge(iNode, jNode, hard: true);
-  }
-
-  Future test_while_break_target() async {
-    await analyze('''
-void f(int i) {
-  L: while (true) {
-    while (true) {
-      if (i != null) break L;
-      if (b()) break;
-    }
-    g(i);
-  }
-  h(i);
-}
-bool b() => true;
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is promoted at the time of the call to h.
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j, because i is not promoted at the time
-    // of the call to g.
-    assertEdge(iNode, jNode, hard: false);
-  }
-
-  Future test_while_cancels_promotions_for_assignments_in_body() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  if (j == null) return;
-  while (true) {
-    i.isEven;
-    j.isEven;
-    j = null;
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future
-      test_while_cancels_promotions_for_assignments_in_condition() async {
-    await analyze('''
-void f(int i, int j) {
-  if (i == null) return;
-  if (j == null) return;
-  while (i.isEven && j.isEven && g(j = null)) {}
-}
-bool g(int k) => true;
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never because its promotion was cancelled.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-
-  Future test_while_promotes() async {
-    await analyze('''
-void f(int i, int j) {
-  while (i != null) {
-    i.isEven;
-    j.isEven;
-  }
-}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    // No edge from i to never because i is promoted.
-    assertNoEdge(iNode, inSet(pointsToNever));
-    // But there is an edge from j to never.
-    assertEdge(jNode, inSet(pointsToNever), hard: false);
-  }
-}
diff --git a/pkg/nnbd_migration/test/edge_builder_test.dart b/pkg/nnbd_migration/test/edge_builder_test.dart
deleted file mode 100644
index 85d5bf403337..000000000000
--- a/pkg/nnbd_migration/test/edge_builder_test.dart
+++ /dev/null
@@ -1,8356 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/analysis/features.dart';
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/nullability_suffix.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/dart/element/type_system.dart';
-import 'package:analyzer/source/line_info.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer/src/dart/analysis/experiments.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:analyzer/src/dart/element/type_provider.dart';
-import 'package:analyzer/src/dart/element/type_system.dart' show TypeSystemImpl;
-import 'package:analyzer/src/error/codes.g.dart';
-import 'package:analyzer/src/generated/testing/test_type_provider.dart';
-import 'package:nnbd_migration/fix_reason_target.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/src/decorated_class_hierarchy.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/edge_builder.dart';
-import 'package:nnbd_migration/src/edge_origin.dart';
-import 'package:nnbd_migration/src/expression_checks.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:pub_semver/pub_semver.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'migration_visitor_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(AssignmentCheckerTest);
-    defineReflectiveTests(EdgeBuilderTest);
-  });
-}
-
-@reflectiveTest
-class AssignmentCheckerTest extends Object
-    with EdgeTester, DecoratedTypeTester {
-  static const EdgeOrigin origin = _TestEdgeOrigin();
-
-  LibraryElementImpl? _myLibrary;
-
-  ClassElement? _myListOfListClass;
-
-  late DecoratedType _myListOfListSupertype;
-
-  @override
-  final TypeProvider typeProvider;
-
-  @override
-  final NullabilityGraphForTesting graph;
-
-  @override
-  final decoratedTypeParameterBounds = DecoratedTypeParameterBounds();
-
-  final AssignmentCheckerForTesting checker;
-
-  // ignore: unreachable_from_main
-  factory AssignmentCheckerTest() {
-    var typeProvider = TestTypeProvider().asLegacy;
-    _setCoreLibrariesTypeSystem(typeProvider);
-
-    var graph = NullabilityGraphForTesting();
-    var decoratedClassHierarchy = _DecoratedClassHierarchyForTesting();
-    var checker = AssignmentCheckerForTesting(
-        TypeSystemImpl(
-          isNonNullableByDefault: false,
-          strictCasts: false,
-          strictInference: false,
-          typeProvider: typeProvider,
-        ),
-        typeProvider,
-        graph,
-        decoratedClassHierarchy);
-    var assignmentCheckerTest =
-        AssignmentCheckerTest._(typeProvider, graph, checker);
-    decoratedClassHierarchy.assignmentCheckerTest = assignmentCheckerTest;
-    return assignmentCheckerTest;
-  }
-
-  AssignmentCheckerTest._(this.typeProvider, this.graph, this.checker);
-
-  void assign(DecoratedType source, DecoratedType destination,
-      {bool hard = false}) {
-    checker.checkAssignment(origin,
-        source: source, destination: destination, hard: hard);
-  }
-
-  DecoratedType myListOfList(DecoratedType elementType) {
-    _initMyLibrary();
-    if (_myListOfListClass == null) {
-      var t = typeParameter('T', object());
-      _myListOfListSupertype = list(list(typeParameterType(t)));
-      _myListOfListClass = ClassElementImpl('MyListOfList', 0)
-        ..enclosingElement = _myLibrary!.definingCompilationUnit
-        ..typeParameters = [t]
-        ..supertype = _myListOfListSupertype.type as InterfaceType?;
-    }
-    return DecoratedType(
-      InterfaceTypeImpl(
-        element: _myListOfListClass!,
-        typeArguments: [elementType.type!],
-        nullabilitySuffix: NullabilitySuffix.star,
-      ),
-      newNode(),
-      typeArguments: [elementType],
-    );
-  }
-
-  void test_bottom_to_generic() {
-    var t = list(object());
-    assign(bottom, t);
-    assertEdge(never, t.node, hard: false);
-    assertNoEdge(anyNode, t.typeArguments[0]!.node);
-  }
-
-  void test_bottom_to_simple() {
-    var t = object();
-    assign(bottom, t);
-    assertEdge(never, t.node, hard: false);
-  }
-
-  void test_complex_to_typeParam() {
-    var bound = list(object());
-    var t1 = list(object());
-    var t2 = typeParameterType(typeParameter('T', bound));
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(t1.node, bound.node, hard: false);
-    // TODO(40622): Should this be a checkable edge?
-    assertEdge(t1.typeArguments[0]!.node, bound.typeArguments[0]!.node,
-        hard: false, checkable: false);
-  }
-
-  void test_dynamic_to_dynamic() {
-    assign(dynamic_, dynamic_);
-    // Note: no assertions to do; just need to make sure there wasn't a crash.
-  }
-
-  void test_dynamic_to_void() {
-    assign(dynamic_, void_);
-    // Note: no assertions to do; just need to make sure there wasn't a crash.
-  }
-
-  void test_function_type_named_parameter() {
-    var t1 = function(dynamic_, named: {'x': object()});
-    var t2 = function(dynamic_, named: {'x': object()});
-    assign(t1, t2, hard: true);
-    // Note: t1 and t2 are swapped due to contravariance.
-    assertEdge(t2.namedParameters!['x']!.node, t1.namedParameters!['x']!.node,
-        hard: false, checkable: false);
-  }
-
-  void test_function_type_named_to_no_parameter() {
-    var t1 = function(dynamic_, named: {'x': object()});
-    var t2 = function(dynamic_);
-    assign(t1, t2);
-    // Note: no assertions to do; just need to make sure there wasn't a crash.
-  }
-
-  void test_function_type_positional_parameter() {
-    var t1 = function(dynamic_, positional: [object()]);
-    var t2 = function(dynamic_, positional: [object()]);
-    assign(t1, t2, hard: true);
-    // Note: t1 and t2 are swapped due to contravariance.
-    assertEdge(
-        t2.positionalParameters![0].node, t1.positionalParameters![0].node,
-        hard: false, checkable: false);
-  }
-
-  void test_function_type_positional_to_no_parameter() {
-    var t1 = function(dynamic_, positional: [object()]);
-    var t2 = function(dynamic_);
-    assign(t1, t2);
-    // Note: no assertions to do; just need to make sure there wasn't a crash.
-  }
-
-  void test_function_type_positional_to_required_parameter() {
-    var t1 = function(dynamic_, positional: [object()]);
-    var t2 = function(dynamic_, required: [object()]);
-    assign(t1, t2, hard: true);
-    // Note: t1 and t2 are swapped due to contravariance.
-    assertEdge(
-        t2.positionalParameters![0].node, t1.positionalParameters![0].node,
-        hard: false, checkable: false);
-  }
-
-  void test_function_type_required_parameter() {
-    var t1 = function(dynamic_, required: [object()]);
-    var t2 = function(dynamic_, required: [object()]);
-    assign(t1, t2);
-    // Note: t1 and t2 are swapped due to contravariance.
-    assertEdge(
-        t2.positionalParameters![0].node, t1.positionalParameters![0].node,
-        hard: false, checkable: false);
-  }
-
-  void test_function_type_return_type() {
-    var t1 = function(object());
-    var t2 = function(object());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.returnType!.node, t2.returnType!.node,
-        hard: false, checkable: false);
-  }
-
-  void test_function_void_to_function_object() {
-    // This is not an ideal pattern, but void is assignable to Object in certain
-    // cases such as those with compound types here. We must support it.
-    var t1 = function(void_);
-    var t2 = function(object());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.returnType!.node, t2.returnType!.node,
-        hard: false, checkable: false);
-  }
-
-  void test_future_int_to_future_or_int() {
-    var t1 = future(int_());
-    var t2 = futureOr(int_());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(t1.typeArguments[0]!.node, t2.typeArguments[0]!.node,
-        hard: true, checkable: false);
-  }
-
-  void test_future_or_int_to_future_int() {
-    var t1 = futureOr(int_());
-    var t2 = future(int_());
-    assign(t1, t2, hard: true);
-    // FutureOr? is nullable, so Future? should be.
-    assertEdge(t1.node, t2.node, hard: true);
-    // FutureOr is nullable, so Future? should be.
-    assertEdge(t1.typeArguments[0]!.node, t2.node, hard: true);
-    // FutureOr may hold a Future, so carry that forward.
-    assertEdge(t1.typeArguments[0]!.node, t2.typeArguments[0]!.node,
-        hard: false);
-    // FutureOr? does not accept a Future, so don't draw this.
-    assertNoEdge(t1.node, t2.typeArguments[0]!.node);
-  }
-
-  void test_future_or_int_to_int() {
-    var t1 = futureOr(int_());
-    var t2 = int_();
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(t1.typeArguments[0]!.node, t2.node, hard: false);
-  }
-
-  void test_future_or_list_object_to_list_int() {
-    var t1 = futureOr(list(object()));
-    var t2 = list(int_());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(t1.typeArguments[0]!.node, t2.node, hard: false);
-    assertEdge(
-        t1.typeArguments[0]!.typeArguments[0]!.node, t2.typeArguments[0]!.node,
-        hard: false);
-  }
-
-  void test_future_or_object_to_future_or_int() {
-    var t1 = futureOr(object());
-    var t2 = futureOr(int_());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(t1.typeArguments[0]!.node, t2.typeArguments[0]!.node,
-        hard: false);
-  }
-
-  void test_future_or_to_future_or() {
-    var t1 = futureOr(int_());
-    var t2 = futureOr(int_());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(t1.typeArguments[0]!.node, t2.typeArguments[0]!.node,
-        hard: false);
-  }
-
-  void test_generic_to_dynamic() {
-    var t = list(object());
-    assign(t, dynamic_);
-    assertEdge(t.node, always, hard: false);
-    assertNoEdge(t.typeArguments[0]!.node, anyNode);
-  }
-
-  void test_generic_to_generic_downcast() {
-    var t1 = list(list(object()));
-    var t2 = myListOfList(object());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    // Let A, B, and C be nullability nodes such that:
-    // - t2 is MyListOfList
-    var a = t2.typeArguments[0]!.node;
-    // - t1 is List>
-    var b = t1.typeArguments[0]!.typeArguments[0]!.node;
-    // - the supertype of MyListOfList is List>
-    var c = _myListOfListSupertype.typeArguments[0]!.typeArguments[0]!.node;
-    // Then there should be an edge from b to substitute(a, c)
-    assertEdge(b, substitutionNode(a, c), hard: false);
-  }
-
-  void test_generic_to_generic_downcast_of_type_parameter() {
-    var t = typeParameterType(typeParameter('T', object()));
-    var t1 = iterable(t);
-    var t2 = list(t);
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    var a = t1.typeArguments[0]!.node;
-    var b = t2.typeArguments[0]!.node;
-    assertEdge(a, b, hard: false);
-  }
-
-  void test_generic_to_generic_downcast_same_element() {
-    var t1 = list(object());
-    var t2 = list(int_());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(t1.typeArguments[0]!.node, t2.typeArguments[0]!.node,
-        hard: false);
-  }
-
-  void test_generic_to_generic_same_element() {
-    var t1 = list(object());
-    var t2 = list(object());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(t1.typeArguments[0]!.node, t2.typeArguments[0]!.node,
-        hard: true, checkable: false);
-  }
-
-  void test_generic_to_generic_upcast() {
-    var t1 = myListOfList(object());
-    var t2 = list(list(object()));
-    assign(t1, t2);
-    assertEdge(t1.node, t2.node, hard: false);
-    // Let A, B, and C be nullability nodes such that:
-    // - t1 is MyListOfList
-    var a = t1.typeArguments[0]!.node;
-    // - t2 is List>
-    var b = t2.typeArguments[0]!.typeArguments[0]!.node;
-    // - the supertype of MyListOfList is List>
-    var c = _myListOfListSupertype.typeArguments[0]!.typeArguments[0]!.node;
-    // Then there should be an edge from substitute(a, c) to b.
-    assertEdge(substitutionNode(a, c), b, hard: false, checkable: false);
-  }
-
-  void test_generic_to_object() {
-    var t1 = list(object());
-    var t2 = object();
-    assign(t1, t2);
-    assertEdge(t1.node, t2.node, hard: false);
-    assertNoEdge(t1.typeArguments[0]!.node, anyNode);
-  }
-
-  void test_generic_to_void() {
-    var t = list(object());
-    assign(t, void_);
-    assertEdge(t.node, always, hard: false);
-    assertNoEdge(t.typeArguments[0]!.node, anyNode);
-  }
-
-  void test_int_to_future_or_int() {
-    var t1 = int_();
-    var t2 = futureOr(int_());
-    assign(t1, t2, hard: true);
-    // Note: given code like:
-    //   int x = null;
-    //   FutureOr y = x;
-    // There are two possible migrations for `FutureOr`: we could change it
-    // to either `FutureOr` or `FutureOr?`.  We choose to do
-    // `FutureOr?` because it is a narrower type, so it is less likely to
-    // cause a proliferation of nullable types in the user's program.
-    assertEdge(t1.node, t2.node, hard: true);
-    assertNoEdge(t1.node, t2.typeArguments[0]!.node);
-  }
-
-  void test_iterable_object_to_list_void() {
-    assign(iterable(object()), list(void_));
-    // Note: no assertions to do; just need to make sure there wasn't a crash.
-  }
-
-  void test_null_to_generic() {
-    var t = list(object());
-    assign(null_, t);
-    assertEdge(always, t.node, hard: false);
-    assertNoEdge(anyNode, t.typeArguments[0]!.node);
-  }
-
-  void test_null_to_simple() {
-    var t = object();
-    assign(null_, t);
-    assertEdge(always, t.node, hard: false);
-  }
-
-  void test_object_to_void() {
-    assign(object(), void_);
-    // Note: no assertions to do; just need to make sure there wasn't a crash.
-  }
-
-  void test_simple_to_dynamic() {
-    var t = object();
-    assign(t, dynamic_);
-    assertEdge(t.node, always, hard: false);
-  }
-
-  void test_simple_to_simple() {
-    var t1 = object();
-    var t2 = object();
-    assign(t1, t2);
-    assertEdge(t1.node, t2.node, hard: false);
-  }
-
-  void test_simple_to_simple_hard() {
-    var t1 = object();
-    var t2 = object();
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-  }
-
-  void test_simple_to_void() {
-    var t = object();
-    assign(t, void_);
-    assertEdge(t.node, always, hard: false);
-  }
-
-  void test_typeParam_to_complex() {
-    var bound = list(object());
-    var t1 = typeParameterType(typeParameter('T', bound));
-    var t2 = list(object());
-    assign(t1, t2, hard: true);
-    assertEdge(t1.node, t2.node, hard: true);
-    assertEdge(bound.node, t2.node, hard: false);
-    // TODO(40622): Should this be a checkable edge?
-    assertEdge(bound.typeArguments[0]!.node, t2.typeArguments[0]!.node,
-        hard: false, checkable: false);
-  }
-
-  void test_typeParam_to_object() {
-    var t1 = typeParameterType(typeParameter('T', object()));
-    var t2 = object();
-    assign(t1, t2);
-    assertEdge(t1.node, t2.node, hard: false);
-  }
-
-  void test_typeParam_to_typeParam() {
-    var t = typeParameter('T', object());
-    var t1 = typeParameterType(t);
-    var t2 = typeParameterType(t);
-    assign(t1, t2);
-    assertEdge(t1.node, t2.node, hard: false);
-  }
-
-  @override
-  TypeParameterElement typeParameter(String name, DecoratedType bound) {
-    var t = super.typeParameter(name, bound);
-    checker.bounds[t] = bound;
-    return t;
-  }
-
-  void _initMyLibrary() {
-    if (_myLibrary != null) {
-      return;
-    }
-
-    var coreLibrary = typeProvider.boolElement.library as LibraryElementImpl;
-    var analysisContext = coreLibrary.context;
-    var analysisSession = coreLibrary.session;
-    var typeSystem = coreLibrary.typeSystem;
-
-    var uriStr = 'package:test/test.dart';
-    var uri = Uri.parse(uriStr);
-    var source = _MockSource(uri);
-
-    var definingUnit = CompilationUnitElementImpl(
-      source: source,
-      librarySource: source,
-      lineInfo: LineInfo([0]),
-    );
-
-    _myLibrary = LibraryElementImpl(
-      analysisContext,
-      analysisSession,
-      uriStr,
-      -1,
-      0,
-      FeatureSet.fromEnableFlags2(
-        sdkLanguageVersion: Version.parse('2.10.0'),
-        flags: [EnableString.non_nullable],
-      ),
-    )
-      ..definingCompilationUnit = definingUnit
-      ..typeProvider = coreLibrary.typeProvider
-      ..typeSystem = typeSystem;
-  }
-
-  static void _setCoreLibrariesTypeSystem(TypeProviderImpl typeProvider) {
-    var typeSystem = TypeSystemImpl(
-      isNonNullableByDefault: false,
-      strictCasts: false,
-      strictInference: false,
-      typeProvider: typeProvider,
-    );
-    _setLibraryTypeSystem(
-      typeProvider.objectElement.library,
-      typeProvider,
-      typeSystem,
-    );
-    _setLibraryTypeSystem(
-      typeProvider.futureElement.library,
-      typeProvider,
-      typeSystem,
-    );
-  }
-
-  static void _setLibraryTypeSystem(
-    LibraryElement libraryElement,
-    TypeProvider typeProvider,
-    TypeSystem typeSystem,
-  ) {
-    var libraryElementImpl = libraryElement as LibraryElementImpl;
-    libraryElementImpl.typeProvider = typeProvider as TypeProviderImpl;
-    libraryElementImpl.typeSystem = typeSystem as TypeSystemImpl;
-  }
-}
-
-@reflectiveTest
-class EdgeBuilderTest extends EdgeBuilderTestBase {
-  void assertGLB(
-      NullabilityNode? node, NullabilityNode? left, NullabilityNode? right) {
-    expect(node, isNot(TypeMatcher()));
-    assertEdge(left, node, hard: false, guards: [right]);
-    assertEdge(node, left, hard: false);
-    assertEdge(node, right, hard: false);
-  }
-
-  void assertLUB(NullabilityNode node, Object? left, Object? right) {
-    var conditionalNode = node as NullabilityNodeForLUB;
-    var leftMatcher = NodeMatcher(left);
-    var rightMatcher = NodeMatcher(right);
-    expect(leftMatcher.matches(conditionalNode.left), true);
-    expect(rightMatcher.matches(conditionalNode.right), true);
-  }
-
-  /// Checks that there are no nullability nodes upstream from [node] that could
-  /// cause it to become nullable.
-  void assertNoUpstreamNullability(NullabilityNode? node) {
-    // Store `neverClosure` in a local variable so that we avoid the
-    // computational expense of recomputing it each time through the loop below.
-    var neverClosure = this.neverClosure;
-
-    // Any node with a hard edge to never (or never itself) won't become
-    // nullable, even if it has nodes upstream from it.
-    if (neverClosure.contains(node)) return;
-
-    // Otherwise, make sure that every node directly upstream from this node
-    // has a hard edge to never.
-    for (var edge in getEdges(anyNode, node)) {
-      expect(neverClosure, contains(edge.sourceNode));
-    }
-  }
-
-  /// Verifies that a null check will occur when the given edge is unsatisfied.
-  ///
-  /// [expressionChecks] is the object tracking whether or not a null check is
-  /// needed.
-  void assertNullCheck(
-      ExpressionChecksOrigin expressionChecks, NullabilityEdge expectedEdge) {
-    expect(expressionChecks.checks.edges.values, contains(expectedEdge));
-  }
-
-  /// Gets the [ExpressionChecks] associated with the expression whose text
-  /// representation is [text], or `null` if the expression has no
-  /// [ExpressionChecks] associated with it.
-  ExpressionChecksOrigin? checkExpression(String text) {
-    return variables.checkExpression(findNode.expression(text));
-  }
-
-  /// Gets the [DecoratedType] associated with the expression whose text
-  /// representation is [text], or `null` if the expression has no
-  /// [DecoratedType] associated with it.
-  DecoratedType? decoratedExpressionType(String text) {
-    return variables.decoratedExpressionType(findNode.expression(text));
-  }
-
-  bool hasNullCheckHint(Expression expression) =>
-      variables.getNullCheckHint(testSource, expression) != null;
-
-  Future test_already_migrated_field() async {
-    await analyze('''
-double f() => double.nan;
-''');
-    var nanElement = typeProvider.doubleElement.getField('nan')!;
-    assertEdge(variables.decoratedElementType(nanElement).node,
-        decoratedTypeAnnotation('double f').node,
-        hard: false);
-  }
-
-  Future test_ArgumentError_checkNotNull_not_postDominating() async {
-    await analyze('''
-void f(bool b, int i, int j) {
-  ArgumentError.checkNotNull(j);
-  if (b) return;
-  ArgumentError.checkNotNull(i);
-}
-''');
-
-    // Asserts after ifs don't demonstrate non-null intent.
-    assertNoEdge(decoratedTypeAnnotation('int i').node, never);
-    // But asserts before ifs do
-    assertEdge(decoratedTypeAnnotation('int j').node, never, hard: true);
-  }
-
-  Future test_ArgumentError_checkNotNull_postDominating() async {
-    await analyze('''
-void f(int i) {
-  ArgumentError.checkNotNull(i);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-  }
-
-  Future test_ArgumentError_checkNotNull_prefixed() async {
-    await analyze('''
-import 'dart:core' as core;
-void f(core.int i) {
-  core.ArgumentError.checkNotNull(i);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-  }
-
-  Future test_as_dynamic() async {
-    await analyze('''
-void f(Object o) {
-  (o as dynamic).gcd(1);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('Object o').node,
-        decoratedTypeAnnotation('dynamic').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('dynamic').node, never, hard: true);
-  }
-
-  Future test_as_int() async {
-    await analyze('''
-void f(Object o) {
-  (o as int).gcd(1);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('Object o').node,
-        decoratedTypeAnnotation('int').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int').node, never, hard: true);
-    expect(
-        variables.wasUnnecessaryCast(testSource, findNode.as_('o as')), false);
-  }
-
-  Future test_as_int_null_ok() async {
-    await analyze('''
-void f(Object o) {
-  (o as int)?.gcd(1);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('Object o').node,
-        decoratedTypeAnnotation('int').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int').node, never);
-  }
-
-  Future test_as_int_unnecessary() async {
-    verifyNoTestUnitErrors = false;
-    await analyze('''
-void f(int i) {
-  (i as int).gcd(1);
-}
-''');
-    expect(testAnalysisResult.errors.single.errorCode,
-        WarningCode.UNNECESSARY_CAST);
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int)').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int)').node, never, hard: true);
-    expect(
-        variables.wasUnnecessaryCast(testSource, findNode.as_('i as')), true);
-  }
-
-  Future test_as_side_cast() async {
-    await analyze('''
-class A {}
-class B {}
-class C implements A, B {}
-B f(A a) {
-  // possible via f(C());
-  return a as B;
-}
-''');
-    assertEdge(
-        decoratedTypeAnnotation('A a').node, decoratedTypeAnnotation('B;').node,
-        hard: true);
-  }
-
-  Future test_as_side_cast_generics() async {
-    await analyze('''
-class A {}
-class B {}
-class C implements A, B {}
-B f(A a) {
-  // possible via f(C());
-  return a as B;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('A a').node,
-        decoratedTypeAnnotation('B;').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('bool>;').node,
-        decoratedTypeAnnotation('bool> f').node,
-        hard: true, checkable: false);
-    assertNoEdge(anyNode, decoratedTypeAnnotation('bool>;').node);
-    assertNoEdge(anyNode, decoratedTypeAnnotation('int> a').node);
-    // int> a should be connected to the bound of T in A, but nothing else.
-    expect(
-        decoratedTypeAnnotation('int> a').node.downstreamEdges, hasLength(1));
-  }
-
-  Future test_assert_demonstrates_non_null_intent() async {
-    await analyze('''
-void f(int i) {
-  assert(i != null);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-  }
-
-  Future test_assert_initializer_demonstrates_non_null_intent() async {
-    await analyze('''
-class C {
-  C(int i)
-    : assert(i != null);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-  }
-
-  Future test_assert_is_demonstrates_non_null_intent() async {
-    // Note, this could also be handled via improved flow analysis rather than a
-    // hard edge.
-    await analyze('''
-void f(dynamic i) {
-  assert(i is int);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('dynamic i').node, never, hard: true);
-  }
-
-  Future test_assign_bound_to_type_parameter() async {
-    await analyze('''
-class C> {
-  T f(List x) => x;
-}
-''');
-    var boundType = decoratedTypeAnnotation('List>');
-    var parameterType = decoratedTypeAnnotation('List x');
-    var tType = decoratedTypeAnnotation('T f');
-    assertEdge(parameterType.node, tType.node, hard: true);
-    assertEdge(parameterType.node, boundType.node, hard: false);
-    // TODO(mfairhurst): Confirm we want this edge.
-    // TODO(40622): Should this be a checkable edge?
-    assertEdge(
-        parameterType.typeArguments[0]!.node, boundType.typeArguments[0]!.node,
-        hard: false, checkable: false);
-  }
-
-  Future test_assign_dynamic_to_other_type() async {
-    await analyze('''
-int f(dynamic d) => d;
-''');
-    // There is no explicit null check necessary, since `dynamic` is
-    // downcastable to any type, nullable or not.
-    expect(checkExpression('d;'), isNull);
-    // But we still create an edge, to make sure that the possibility of `null`
-    // propagates to callees.
-    assertEdge(decoratedTypeAnnotation('dynamic').node,
-        decoratedTypeAnnotation('int').node,
-        hard: true);
-  }
-
-  Future test_assign_function_type_to_function_interface_type() async {
-    await analyze('''
-Function f(void Function() x) => x;
-''');
-    assertEdge(decoratedGenericFunctionTypeAnnotation('void Function()').node,
-        decoratedTypeAnnotation('Function f').node,
-        hard: true);
-  }
-
-  Future test_assign_future_to_futureOr_complex() async {
-    await analyze('''
-import 'dart:async';
-FutureOr> f(Future> x) => x;
-''');
-    // If `x` is `Future>`, then the only way to migrate is to make
-    // the return type `FutureOr>`.
-    assertEdge(decoratedTypeAnnotation('int>> x').node,
-        decoratedTypeAnnotation('int>> f').node,
-        hard: true, checkable: false);
-    assertNoEdge(decoratedTypeAnnotation('int>> x').node,
-        decoratedTypeAnnotation('List> f').node);
-    assertNoEdge(decoratedTypeAnnotation('int>> x').node,
-        decoratedTypeAnnotation('FutureOr> f').node);
-  }
-
-  Future test_assign_future_to_futureOr_simple() async {
-    await analyze('''
-import 'dart:async';
-FutureOr f(Future x) => x;
-''');
-    // If `x` is nullable, then there are two migrations possible: we could make
-    // the return type `FutureOr` or we could make it `FutureOr?`.
-    // We choose `FutureOr?` because it's strictly more conservative (it's
-    // a subtype of `FutureOr`).
-    assertEdge(decoratedTypeAnnotation('Future x').node,
-        decoratedTypeAnnotation('FutureOr').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('Future x').node,
-        decoratedTypeAnnotation('int> f').node);
-    // If `x` is `Future`, then the only way to migrate is to make the
-    // return type `FutureOr`.
-
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int> x').node, inSet(pointsToNever)),
-        decoratedTypeAnnotation('int> f').node,
-        hard: true,
-        checkable: false);
-    assertNoEdge(decoratedTypeAnnotation('int> x').node,
-        decoratedTypeAnnotation('FutureOr').node);
-  }
-
-  Future test_assign_non_future_to_futureOr_complex() async {
-    await analyze('''
-import 'dart:async';
-FutureOr> f(List x) => x;
-''');
-    // If `x` is `List`, then the only way to migrate is to make the
-    // return type `FutureOr>`.
-    assertEdge(decoratedTypeAnnotation('int> x').node,
-        decoratedTypeAnnotation('int>> f').node,
-        hard: false, checkable: false);
-    assertNoEdge(decoratedTypeAnnotation('int> x').node,
-        decoratedTypeAnnotation('List> f').node);
-    assertNoEdge(decoratedTypeAnnotation('int> x').node,
-        decoratedTypeAnnotation('FutureOr> f').node);
-  }
-
-  Future test_assign_non_future_to_futureOr_simple() async {
-    await analyze('''
-import 'dart:async';
-FutureOr f(int x) => x;
-''');
-    // If `x` is nullable, then there are two migrations possible: we could make
-    // the return type `FutureOr` or we could make it `FutureOr?`.
-    // We choose `FutureOr?` because it's strictly more conservative (it's
-    // a subtype of `FutureOr`).
-    assertEdge(decoratedTypeAnnotation('int x').node,
-        decoratedTypeAnnotation('FutureOr').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int x').node,
-        decoratedTypeAnnotation('int>').node);
-  }
-
-  Future test_assign_null_to_generic_type() async {
-    await analyze('''
-main() {
-  List x = null;
-}
-''');
-    // TODO(paulberry): edge should be hard.
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('List').node,
-        hard: false);
-  }
-
-  Future test_assign_to_bound_as() async {
-    // TODO(mfairhurst): support downcast to type params with bounds
-    await analyze('''
-class C {}
-void f(Object o) {
-  o as C;
-}
-''');
-    // For now, edge to `anyNode`, because the true bound is inferred.
-    assertEdge(decoratedTypeAnnotation('int').node, anyNode, hard: true);
-  }
-
-  Future test_assign_to_bound_class_alias() async {
-    await analyze('''
-class C {}
-class D {}
-mixin M {}
-class F = C with M implements D;
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object/*1*/').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('num').node,
-        decoratedTypeAnnotation('Object/*2*/').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('String').node,
-        decoratedTypeAnnotation('Object/*3*/').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_class_extends() async {
-    await analyze('''
-class A {}
-class C extends A {}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_class_implements() async {
-    await analyze('''
-class A {}
-class C implements A {}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_class_with() async {
-    await analyze('''
-class A {}
-class C extends Object with A {}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object>').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_extension_extended_type() async {
-    await analyze('''
-class C {}
-extension E on C {}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object>').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_field_formal_typed() async {
-    await analyze('''
-class C {}
-class D {
-  dynamic i;
-  D(C this.i);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_field_formal_typed_function() async {
-    await analyze('''
-class C {}
-class D {
-  dynamic i;
-  D(this.i(C name));
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_for() async {
-    await analyze('''
-class C {}
-void main() {
-  for (C c = null ;;) {}
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object>').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_for_element() async {
-    await analyze('''
-class C {}
-void main() {
-  [for (C c = null ;;) c];
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object>').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_for_in() async {
-    await analyze('''
-class C {}
-void main() {
-  for (C c in []) {}
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object>').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_for_in_element() async {
-    await analyze('''
-class C {}
-void main() {
-  [for (C c in []) c];
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object>').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_function_invocation_type_argument() async {
-    await analyze('''
-void f() {}
-void main() {
-  (f)();
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_in_return_type() async {
-    await analyze('''
-class C {}
-C f() => null;
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_in_type_argument() async {
-    await analyze('''
-class C {}
-C> f() => null;
-''');
-    assertEdge(decoratedTypeAnnotation('C').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_instance_creation() async {
-    await analyze('''
-class C {}
-void main() {
-  C();
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_list_literal() async {
-    await analyze('''
-class C {}
-void main() {
-  >[];
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_local_variable() async {
-    await analyze('''
-class C {}
-main() {
-  C c = null;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_map_literal() async {
-    await analyze('''
-class C {}
-void main() {
-  , C>{};
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('String').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_method_bound() async {
-    await analyze('''
-class C {}
-class D {
-  f>() {}
-}
-''');
-  }
-
-  Future test_assign_to_bound_method_call_type_argument() async {
-    await analyze('''
-void f() {}
-void main() {
-  f();
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_mixin_implements() async {
-    await analyze('''
-class A {}
-mixin C implements A {}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_mixin_on() async {
-    await analyze('''
-class A {}
-mixin C on A {}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_mixin_type_parameter_bound() async {
-    await analyze('''
-class C {}
-mixin M> {}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_redirecting_constructor_argument() async {
-    await analyze('''
-class A {}
-class C {
-  factory C() = D>;
-}
-class D implements C {}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_set_literal() async {
-    await analyze('''
-class C {}
-void main() {
-  >{};
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_assign_to_bound_within_bound() async {
-    await analyze('''
-class A {}
-class B> {}
-  ''');
-    var aBound = decoratedTypeAnnotation('Object').node;
-    var aBoundInt = decoratedTypeAnnotation('int').node;
-    assertEdge(aBoundInt, aBound, hard: true);
-  }
-
-  Future test_assign_to_bound_within_bound_method() async {
-    await analyze('''
-class C {}
-void f>() {}
-''');
-    var cBound = decoratedTypeAnnotation('Object').node;
-    var fcInt = decoratedTypeAnnotation('int').node;
-    assertEdge(fcInt, cBound, hard: true);
-  }
-
-  Future test_assign_type_parameter_to_bound() async {
-    await analyze('''
-class C> {
-  List f(T x) => x;
-}
-''');
-    var boundType = decoratedTypeAnnotation('List>');
-    var returnType = decoratedTypeAnnotation('List f');
-    var tType = decoratedTypeAnnotation('T x');
-    assertEdge(tType.node, returnType.node, hard: true);
-    assertEdge(boundType.node, returnType.node, hard: false);
-    // TODO(40622): Should this be a checkable edge?
-    assertEdge(
-        boundType.typeArguments[0]!.node, returnType.typeArguments[0]!.node,
-        hard: false, checkable: false);
-  }
-
-  Future test_assign_upcast_generic() async {
-    await analyze('''
-void f(Iterable x) {}
-void g(List x) {
-  f(x);
-}
-''');
-
-    var iterableInt = decoratedTypeAnnotation('Iterable');
-    var listInt = decoratedTypeAnnotation('List');
-    assertEdge(listInt.node, iterableInt.node, hard: true);
-    assertEdge(
-        substitutionNode(listInt.typeArguments[0]!.node, inSet(pointsToNever)),
-        iterableInt.typeArguments[0]!.node,
-        hard: true,
-        checkable: false);
-  }
-
-  Future test_assignment_code_reference() async {
-    await analyze('''
-void f(int i) {
-  int j = i;
-}
-''');
-    var edge = assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int j').node,
-        hard: true);
-    var codeReference = edge.codeReference!;
-    expect(codeReference, isNotNull);
-    expect(codeReference.path, contains('test.dart'));
-    expect(codeReference.line, 2);
-    expect(codeReference.column, 11);
-  }
-
-  Future test_assignmentExpression_compound_dynamic() async {
-    await analyze('''
-void f(dynamic x, int y) {
-  x += y;
-}
-''');
-    // No assertions; just making sure this doesn't crash.
-  }
-
-  Future test_assignmentExpression_compound_simple() async {
-    var code = '''
-abstract class C {
-  C operator+(C x);
-}
-C f(C y, C z) => (y += z);
-''';
-    await analyze(code);
-    var targetEdge = assertEdge(
-        decoratedTypeAnnotation('C y').node, inSet(pointsToNever),
-        hard: true);
-    expect(
-        (graph.getEdgeOrigin(targetEdge) as CompoundAssignmentOrigin)
-            .node!
-            .operator
-            .offset,
-        code.indexOf('+='));
-    assertNullCheck(
-        checkExpression('z);')!,
-        assertEdge(decoratedTypeAnnotation('C z').node,
-            decoratedTypeAnnotation('C x').node,
-            hard: true));
-    var operatorReturnEdge = assertEdge(
-        decoratedTypeAnnotation('C operator').node,
-        decoratedTypeAnnotation('C y').node,
-        hard: false);
-    expect(
-        (graph.getEdgeOrigin(operatorReturnEdge) as CompoundAssignmentOrigin)
-            .node!
-            .operator
-            .offset,
-        code.indexOf('+='));
-    var fReturnEdge = assertEdge(decoratedTypeAnnotation('C operator').node,
-        decoratedTypeAnnotation('C f').node,
-        hard: false);
-    assertNullCheck(checkExpression('(y += z)')!, fReturnEdge);
-  }
-
-  Future test_assignmentExpression_compound_withSubstitution() async {
-    // Failing due to a side-cast from incorrectly instantiating the operator.
-    var code = '''
-abstract class C {
-  C operator+(C x);
-}
-C f(C y, C z) => (y += z);
-''';
-    await analyze(code);
-    var targetEdge = assertEdge(
-        decoratedTypeAnnotation('C y').node, inSet(pointsToNever),
-        hard: true);
-    expect(
-        (graph.getEdgeOrigin(targetEdge) as CompoundAssignmentOrigin)
-            .node!
-            .operator
-            .offset,
-        code.indexOf('+='));
-    assertNullCheck(
-        checkExpression('z);')!,
-        assertEdge(decoratedTypeAnnotation('C z').node,
-            decoratedTypeAnnotation('C x').node,
-            hard: true));
-    var operatorReturnEdge = assertEdge(
-        decoratedTypeAnnotation('C operator').node,
-        decoratedTypeAnnotation('C y').node,
-        hard: false);
-    expect(
-        (graph.getEdgeOrigin(operatorReturnEdge) as CompoundAssignmentOrigin)
-            .node!
-            .operator
-            .offset,
-        code.indexOf('+='));
-    var fReturnEdge = assertEdge(decoratedTypeAnnotation('C operator').node,
-        decoratedTypeAnnotation('C f').node,
-        hard: false);
-    assertNullCheck(checkExpression('(y += z)')!, fReturnEdge);
-  }
-
-  Future test_assignmentExpression_field() async {
-    await analyze('''
-class C {
-  int x = 0;
-}
-void f(C c, int i) {
-  c.x = i;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_assignmentExpression_field_cascaded() async {
-    await analyze('''
-class C {
-  int x = 0;
-}
-void f(C c, int i) {
-  c..x = i;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_assignmentExpression_field_target_check() async {
-    await analyze('''
-class C {
-  int x = 0;
-}
-void f(C c, int i) {
-  c.x = i;
-}
-''');
-    assertNullCheck(checkExpression('c.x')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_assignmentExpression_field_target_check_cascaded() async {
-    await analyze('''
-class C {
-  int x = 0;
-}
-void f(C c, int i) {
-  c..x = i;
-}
-''');
-    assertNullCheck(checkExpression('c..x')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_assignmentExpression_indexExpression_index() async {
-    await analyze('''
-class C {
-  void operator[]=(int a, int b) {}
-}
-void f(C c, int i, int j) {
-  c[i] = j;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int a').node,
-        hard: true);
-  }
-
-  Future test_assignmentExpression_indexExpression_return_value() async {
-    await analyze('''
-class C {
-  void operator[]=(int a, int b) {}
-}
-int f(C c, int i, int j) => c[i] = j;
-''');
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_assignmentExpression_indexExpression_target_check() async {
-    await analyze('''
-class C {
-  void operator[]=(int a, int b) {}
-}
-void f(C c, int i, int j) {
-  c[i] = j;
-}
-''');
-    assertNullCheck(checkExpression('c[')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_assignmentExpression_indexExpression_value() async {
-    await analyze('''
-class C {
-  void operator[]=(int a, int b) {}
-}
-void f(C c, int i, int j) {
-  c[i] = j;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int b').node,
-        hard: true);
-  }
-
-  Future
-      test_assignmentExpression_nullAware_complex_contravariant() async {
-    await analyze('''
-void Function(int) f(void Function(int) x, void Function(int) y) => x ??= y;
-''');
-    var xNullable =
-        decoratedGenericFunctionTypeAnnotation('void Function(int) x').node;
-    var xParamNullable = decoratedTypeAnnotation('int) x').node;
-    var yParamNullable = decoratedTypeAnnotation('int) y').node;
-    var returnParamNullable = decoratedTypeAnnotation('int) f').node;
-    assertEdge(xParamNullable, yParamNullable,
-        hard: false, checkable: false, guards: [xNullable]);
-    assertEdge(returnParamNullable, xParamNullable,
-        hard: false, checkable: false);
-  }
-
-  Future test_assignmentExpression_nullAware_complex_covariant() async {
-    await analyze('''
-List f(List x, List y) => x ??= y;
-''');
-    var xNullable = decoratedTypeAnnotation('List x').node;
-    var yNullable = decoratedTypeAnnotation('List y').node;
-    var xElementNullable = decoratedTypeAnnotation('int> x').node;
-    var yElementNullable = decoratedTypeAnnotation('int> y').node;
-    var returnElementNullable = decoratedTypeAnnotation('int> f').node;
-    assertEdge(yNullable, xNullable, hard: false, guards: [xNullable]);
-    assertEdge(yElementNullable, xElementNullable,
-        hard: false, checkable: false, guards: [xNullable]);
-    assertEdge(xElementNullable, returnElementNullable,
-        hard: false, checkable: false);
-  }
-
-  Future test_assignmentExpression_nullAware_simple() async {
-    await analyze('''
-int f(int x, int y) => (x ??= y);
-''');
-    var yNullable = decoratedTypeAnnotation('int y').node;
-    var xNullable = decoratedTypeAnnotation('int x').node;
-    var returnNullable = decoratedTypeAnnotation('int f').node;
-    var glbNode = decoratedExpressionType('(x ??= y)')!.node;
-    assertEdge(yNullable, xNullable, hard: false, guards: [xNullable]);
-    assertEdge(yNullable, glbNode, hard: false, guards: [xNullable]);
-    assertEdge(glbNode, xNullable, hard: false);
-    assertEdge(glbNode, yNullable, hard: false);
-    assertEdge(glbNode, returnNullable, hard: false);
-  }
-
-  Future test_assignmentExpression_operands() async {
-    await analyze('''
-void f(int i, int j) {
-  i = j;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int i').node,
-        hard: true);
-  }
-
-  Future test_assignmentExpression_return_value() async {
-    await analyze('''
-void f(int i, int j) {
-  g(i = j);
-}
-void g(int k) {}
-''');
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int k').node,
-        hard: false);
-  }
-
-  Future test_assignmentExpression_setter() async {
-    await analyze('''
-class C {
-  void set s(int value) {}
-}
-void f(C c, int i) {
-  c.s = i;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int value').node,
-        hard: true);
-  }
-
-  Future test_assignmentExpression_setter_null_aware() async {
-    await analyze('''
-class C {
-  void set s(int value) {}
-}
-int f(C c, int i) => (c?.s = i);
-''');
-    var lubNode =
-        decoratedExpressionType('(c?.s = i)')!.node as NullabilityNodeForLUB;
-    expect(lubNode.left, same(decoratedTypeAnnotation('C c').node));
-    expect(lubNode.right, same(decoratedTypeAnnotation('int i').node));
-    assertEdge(lubNode, decoratedTypeAnnotation('int f').node, hard: false);
-  }
-
-  Future test_assignmentExpression_setter_target_check() async {
-    await analyze('''
-class C {
-  void set s(int value) {}
-}
-void f(C c, int i) {
-  c.s = i;
-}
-''');
-    assertNullCheck(checkExpression('c.s')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  @failingTest
-  Future test_awaitExpression_future_nonNullable() async {
-    await analyze('''
-Future f() async {
-  int x = await g();
-}
-Future g() async => 3;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int').node);
-  }
-
-  @failingTest
-  Future test_awaitExpression_future_nullable() async {
-    await analyze('''
-Future f() async {
-  int x = await g();
-}
-Future g() async => null;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_awaitExpression_nonFuture() async {
-    await analyze('''
-Future f() async {
-  int x = await 3;
-}
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_binaryExpression_ampersand_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i & j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_ampersandAmpersand() async {
-    await analyze('''
-bool f(bool i, bool j) => i && j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool i').node);
-  }
-
-  Future test_binaryExpression_bar_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i | j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_barBar() async {
-    await analyze('''
-bool f(bool i, bool j) => i || j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool i').node);
-  }
-
-  Future test_binaryExpression_caret_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i ^ j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_equal() async {
-    await analyze('''
-bool f(int i, int j) => i == j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool f').node);
-  }
-
-  Future test_binaryExpression_equal_null() async {
-    await analyze('''
-void f(int i) {
-  if (i == null) {
-    g(i);
-  } else {
-    h(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is known to be non-nullable at the site of
-    // the call to h()
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j
-    assertEdge(iNode, jNode, hard: false, guards: [iNode]);
-  }
-
-  Future test_binaryExpression_equal_null_null() async {
-    await analyze('''
-void f(int i) {
-  if (null == null) {
-    g(i);
-  }
-}
-void g(int j) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    assertEdge(iNode, jNode,
-        hard: false,
-        guards: TypeMatcher>()
-            .having((g) => g.single, 'single value', isIn(alwaysPlus)));
-  }
-
-  Future test_binaryExpression_equal_null_yoda_condition() async {
-    await analyze('''
-void f(int i) {
-  if (null == i) {
-    g(i);
-  } else {
-    h(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is known to be non-nullable at the site of
-    // the call to h()
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j
-    assertEdge(iNode, jNode, hard: false, guards: [iNode]);
-  }
-
-  Future test_binaryExpression_gt_result_not_null() async {
-    await analyze('''
-bool f(int i, int j) => i > j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool f').node);
-  }
-
-  Future test_binaryExpression_gtEq_result_not_null() async {
-    await analyze('''
-bool f(int i, int j) => i >= j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool f').node);
-  }
-
-  Future test_binaryExpression_gtGt_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i >> j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_left_dynamic() async {
-    await analyze('''
-Object f(dynamic x, int y) => x + g(y);
-int g(int z) => z;
-''');
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int z').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int g').node, anyNode);
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('Object f').node,
-        hard: false);
-  }
-
-  Future test_binaryExpression_lt_result_not_null() async {
-    await analyze('''
-bool f(int i, int j) => i < j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool f').node);
-  }
-
-  Future test_binaryExpression_ltEq_result_not_null() async {
-    await analyze('''
-bool f(int i, int j) => i <= j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool f').node);
-  }
-
-  Future test_binaryExpression_ltLt_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i << j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_minus_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i - j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_notEqual() async {
-    await analyze('''
-bool f(int i, int j) => i != j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool f').node);
-  }
-
-  Future test_binaryExpression_notEqual_null() async {
-    await analyze('''
-void f(int i) {
-  if (i != null) {
-    h(i);
-  } else {
-    g(i);
-  }
-}
-void g(int j) {}
-void h(int k) {}
-''');
-    var iNode = decoratedTypeAnnotation('int i').node;
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var kNode = decoratedTypeAnnotation('int k').node;
-    // No edge from i to k because i is known to be non-nullable at the site of
-    // the call to h()
-    assertNoEdge(iNode, kNode);
-    // But there is an edge from i to j
-    assertEdge(iNode, jNode, hard: false, guards: [iNode]);
-  }
-
-  Future test_binaryExpression_percent_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i % j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_plus_left_check() async {
-    await analyze('''
-int f(int i, int j) => i + j;
-''');
-
-    assertNullCheck(checkExpression('i +')!,
-        assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true));
-  }
-
-  Future test_binaryExpression_plus_left_check_custom() async {
-    await analyze('''
-class Int {
-  Int operator+(Int other) => this;
-}
-Int f(Int i, Int j) => i + j;
-''');
-
-    assertNullCheck(checkExpression('i +')!,
-        assertEdge(decoratedTypeAnnotation('Int i').node, never, hard: true));
-  }
-
-  Future test_binaryExpression_plus_result_custom() async {
-    await analyze('''
-class Int {
-  Int operator+(Int other) => this;
-}
-Int f(Int i, Int j) => (i + j);
-''');
-
-    assertNullCheck(
-        checkExpression('(i + j)')!,
-        assertEdge(decoratedTypeAnnotation('Int operator+').node,
-            decoratedTypeAnnotation('Int f').node,
-            hard: false));
-  }
-
-  Future test_binaryExpression_plus_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i + j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_plus_right_check() async {
-    await analyze('''
-int f(int i, int j) => i + j;
-''');
-
-    assertNullCheck(
-        checkExpression('j;')!,
-        assertEdge(decoratedTypeAnnotation('int j').node, inSet(pointsToNever),
-            hard: true));
-  }
-
-  Future test_binaryExpression_plus_right_check_custom() async {
-    await analyze('''
-class Int {
-  Int operator+(Int other) => this;
-}
-Int f(Int i, Int j) => i + j/*check*/;
-''');
-
-    assertNullCheck(
-        checkExpression('j/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('Int j').node,
-            decoratedTypeAnnotation('Int other').node,
-            hard: true));
-  }
-
-  Future test_binaryExpression_plus_substituted() async {
-    await analyze('''
-class _C {
-  T operator+(U u) => throw 'foo';
-}
-Object _f(_C c, String s) => c + s;
-''');
-    assertEdge(
-        decoratedTypeAnnotation('String s').node,
-        substitutionNode(decoratedTypeAnnotation('String>').node,
-            decoratedTypeAnnotation('U u').node),
-        hard: true);
-    assertEdge(
-        substitutionNode(decoratedTypeAnnotation('int,').node,
-            decoratedTypeAnnotation('T operator').node),
-        decoratedTypeAnnotation('Object _f').node,
-        hard: false);
-  }
-
-  Future test_binaryExpression_questionQuestion() async {
-    await analyze('''
-int f(int i, int j) => i ?? j;
-''');
-
-    var left = decoratedTypeAnnotation('int i').node;
-    var right = decoratedTypeAnnotation('int j').node;
-    var expression = decoratedExpressionType('??')!.node;
-    assertEdge(right, expression, guards: [left], hard: false);
-    expect(expression.displayName, '?? operator (test.dart:1:24)');
-  }
-
-  Future
-      test_binaryExpression_questionQuestion_genericReturnType() async {
-    await analyze('''
-class C {
-  C operator +(C c) => this;
-}
-C f(C i, C j) => i ?? j;
-''');
-  }
-
-  Future test_binaryExpression_right_dynamic() async {
-    await analyze('''
-class C {
-  C operator+(C other) => other;
-}
-C f(C x, dynamic y) => x + y;
-''');
-    assertNullCheck(checkExpression('x +')!,
-        assertEdge(decoratedTypeAnnotation('C x').node, never, hard: true));
-    assertEdge(decoratedTypeAnnotation('C operator').node,
-        decoratedTypeAnnotation('C f').node,
-        hard: false);
-  }
-
-  Future test_binaryExpression_slash_result_not_null() async {
-    await analyze('''
-double f(int i, int j) => i / j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('double f').node);
-  }
-
-  Future test_binaryExpression_star_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i * j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_binaryExpression_tildeSlash_result_not_null() async {
-    await analyze('''
-int f(int i, int j) => i ~/ j;
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int f').node);
-  }
-
-  Future test_boolLiteral() async {
-    await analyze('''
-bool f() {
-  return true;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool').node);
-  }
-
-  Future test_cascadeExpression() async {
-    await analyze('''
-class C {
-  int x = 0;
-}
-C f(C c, int i) => c..x = i;
-''');
-    assertEdge(decoratedTypeAnnotation('C c').node,
-        decoratedTypeAnnotation('C f').node,
-        hard: false);
-  }
-
-  Future test_cast_type_used_as_non_nullable() async {
-    await analyze('''
-void f(int/*!*/ i) {}
-void g(num/*?*/ j) {
-  f(j as int);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int)').node,
-        decoratedTypeAnnotation('int/*!*/').node,
-        hard: true);
-  }
-
-  Future test_catch_clause() async {
-    await analyze('''
-foo() => 1;
-main() {
-  try { foo(); } on Exception catch (e) { print(e); }
-}
-''');
-    // No assertions; just checking that it doesn't crash.
-  }
-
-  Future test_catch_clause_no_type() async {
-    await analyze('''
-foo() => 1;
-main() {
-  try { foo(); } catch (e) { print(e); }
-}
-''');
-    // No assertions; just checking that it doesn't crash.
-  }
-
-  Future
-      test_class_alias_synthetic_constructor_with_parameters_complex() async {
-    await analyze('''
-class MyList {}
-class C {
-  C(MyList/*1*/ x);
-}
-mixin M {}
-class D = C with M;
-D f(MyList/*2*/ x) => D(x);
-''');
-    var syntheticConstructor = findElement.unnamedConstructor('D');
-    var constructorType = variables.decoratedElementType(syntheticConstructor);
-    var constructorParameterType = constructorType.positionalParameters![0];
-    assertEdge(decoratedTypeAnnotation('MyList/*2*/').node,
-        constructorParameterType.node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int>/*2*/').node,
-        constructorParameterType.typeArguments[0]!.node,
-        hard: true, checkable: false);
-    assertUnion(constructorParameterType.node,
-        decoratedTypeAnnotation('MyList/*1*/').node);
-    assertUnion(constructorParameterType.typeArguments[0]!.node,
-        decoratedTypeAnnotation('int>/*1*/').node);
-  }
-
-  Future
-      test_class_alias_synthetic_constructor_with_parameters_generic() async {
-    await analyze('''
-class C {
-  C(T t);
-}
-mixin M {}
-class D = C with M;
-''');
-    var syntheticConstructor = findElement.unnamedConstructor('D');
-    var constructorType = variables.decoratedElementType(syntheticConstructor);
-    var constructorParameterType = constructorType.positionalParameters![0];
-    assertUnion(
-        constructorParameterType.node, decoratedTypeAnnotation('T t').node);
-  }
-
-  Future
-      test_class_alias_synthetic_constructor_with_parameters_named() async {
-    await analyze('''
-class C {
-  C({int/*1*/ i});
-}
-mixin M {}
-class D = C with M;
-D f(int/*2*/ i) => D(i: i);
-''');
-    var syntheticConstructor = findElement.unnamedConstructor('D');
-    var constructorType = variables.decoratedElementType(syntheticConstructor);
-    var constructorParameterType = constructorType.namedParameters!['i']!;
-    assertEdge(
-        decoratedTypeAnnotation('int/*2*/').node, constructorParameterType.node,
-        hard: true);
-    assertUnion(constructorParameterType.node,
-        decoratedTypeAnnotation('int/*1*/').node);
-  }
-
-  Future
-      test_class_alias_synthetic_constructor_with_parameters_optional() async {
-    await analyze('''
-class C {
-  C([int/*1*/ i]);
-}
-mixin M {}
-class D = C with M;
-D f(int/*2*/ i) => D(i);
-''');
-    var syntheticConstructor = findElement.unnamedConstructor('D');
-    var constructorType = variables.decoratedElementType(syntheticConstructor);
-    var constructorParameterType = constructorType.positionalParameters![0];
-    assertEdge(
-        decoratedTypeAnnotation('int/*2*/').node, constructorParameterType.node,
-        hard: true);
-    assertUnion(constructorParameterType.node,
-        decoratedTypeAnnotation('int/*1*/').node);
-  }
-
-  Future
-      test_class_alias_synthetic_constructor_with_parameters_required() async {
-    await analyze('''
-class C {
-  C(int/*1*/ i);
-}
-mixin M {}
-class D = C with M;
-D f(int/*2*/ i) => D(i);
-''');
-    var syntheticConstructor = findElement.unnamedConstructor('D');
-    var constructorType = variables.decoratedElementType(syntheticConstructor);
-    var constructorParameterType = constructorType.positionalParameters![0];
-    assertEdge(
-        decoratedTypeAnnotation('int/*2*/').node, constructorParameterType.node,
-        hard: true);
-    assertUnion(constructorParameterType.node,
-        decoratedTypeAnnotation('int/*1*/').node);
-  }
-
-  Future test_class_metadata() async {
-    await analyze('''
-@deprecated
-class C {}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_conditionalExpression_condition_check() async {
-    await analyze('''
-int f(bool b, int i, int j) {
-  return (b ? i : j);
-}
-''');
-
-    var nullable_b = decoratedTypeAnnotation('bool b').node;
-    var check_b = checkExpression('b ?')!;
-    assertNullCheck(check_b, assertEdge(nullable_b, never, hard: true));
-  }
-
-  Future test_conditionalExpression_false_guard() async {
-    await analyze('int f(int x, int y, int z) => x != null ? null : y = z;');
-    var guard = decoratedTypeAnnotation('int x').node;
-    assertEdge(decoratedTypeAnnotation('int z').node,
-        decoratedTypeAnnotation('int y').node,
-        hard: false, guards: [guard]);
-    var conditionalDiscard =
-        variables.conditionalDiscard(findNode.conditionalExpression('!='))!;
-    expect(conditionalDiscard, isNotNull);
-    expect(conditionalDiscard.trueGuard, isNull);
-    expect(conditionalDiscard.falseGuard, same(guard));
-  }
-
-  Future test_conditionalExpression_functionTyped_namedParameter() async {
-    await analyze('''
-void f(bool b, void Function({int p}) x, void Function({int p}) y) {
-  (b ? x : y);
-}
-''');
-    var xType =
-        decoratedGenericFunctionTypeAnnotation('void Function({int p}) x');
-    var yType =
-        decoratedGenericFunctionTypeAnnotation('void Function({int p}) y');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, xType.node, yType.node);
-    assertGLB(resultType.namedParameters!['p']!.node,
-        xType.namedParameters!['p']!.node, yType.namedParameters!['p']!.node);
-  }
-
-  Future
-      test_conditionalExpression_functionTyped_normalParameter() async {
-    await analyze('''
-void f(bool b, void Function(int) x, void Function(int) y) {
-  (b ? x : y);
-}
-''');
-    var xType = decoratedGenericFunctionTypeAnnotation('void Function(int) x');
-    var yType = decoratedGenericFunctionTypeAnnotation('void Function(int) y');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, xType.node, yType.node);
-    assertGLB(
-        resultType.positionalParameters![0].node,
-        xType.positionalParameters![0].node,
-        yType.positionalParameters![0].node);
-  }
-
-  Future
-      test_conditionalExpression_functionTyped_normalParameters() async {
-    await analyze('''
-void f(bool b, void Function(int, int) x, void Function(int, int) y) {
-  (b ? x : y);
-}
-''');
-    var xType =
-        decoratedGenericFunctionTypeAnnotation('void Function(int, int) x');
-    var yType =
-        decoratedGenericFunctionTypeAnnotation('void Function(int, int) y');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, xType.node, yType.node);
-    assertGLB(
-        resultType.positionalParameters![0].node,
-        xType.positionalParameters![0].node,
-        yType.positionalParameters![0].node);
-    assertGLB(
-        resultType.positionalParameters![1].node,
-        xType.positionalParameters![1].node,
-        yType.positionalParameters![1].node);
-  }
-
-  Future
-      test_conditionalExpression_functionTyped_optionalParameter() async {
-    await analyze('''
-void f(bool b, void Function([int]) x, void Function([int]) y) {
-  (b ? x : y);
-}
-''');
-    var xType =
-        decoratedGenericFunctionTypeAnnotation('void Function([int]) x');
-    var yType =
-        decoratedGenericFunctionTypeAnnotation('void Function([int]) y');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, xType.node, yType.node);
-    assertGLB(
-        resultType.positionalParameters![0].node,
-        xType.positionalParameters![0].node,
-        yType.positionalParameters![0].node);
-  }
-
-  Future test_conditionalExpression_functionTyped_returnType() async {
-    await analyze('''
-void f(bool b, int Function() x, int Function() y) {
-  (b ? x : y);
-}
-''');
-    var xType = decoratedGenericFunctionTypeAnnotation('int Function() x');
-    var yType = decoratedGenericFunctionTypeAnnotation('int Function() y');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, xType.node, yType.node);
-    assertLUB(resultType.returnType!.node, xType.returnType!.node,
-        yType.returnType!.node);
-  }
-
-  Future
-      test_conditionalExpression_functionTyped_returnType_void() async {
-    await analyze('''
-void f(bool b, void Function() x, void Function() y) {
-  (b ? x : y);
-}
-''');
-    var xType = decoratedGenericFunctionTypeAnnotation('void Function() x');
-    var yType = decoratedGenericFunctionTypeAnnotation('void Function() y');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, xType.node, yType.node);
-    expect(resultType.returnType!.node.isImmutable, false);
-  }
-
-  Future test_conditionalExpression_general() async {
-    await analyze('''
-int f(bool b, int i, int j) {
-  return (b ? i : j);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_j = decoratedTypeAnnotation('int j').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, nullable_i, nullable_j);
-    var nullable_return = decoratedTypeAnnotation('int f').node;
-    assertNullCheck(checkExpression('(b ? i : j)')!,
-        assertEdge(nullable_conditional, nullable_return, hard: false));
-  }
-
-  Future test_conditionalExpression_generic() async {
-    await analyze('''
-void f(bool b, Map x, Map y) {
-  (b ? x : y);
-}
-''');
-    var xType = decoratedTypeAnnotation('Map x');
-    var yType = decoratedTypeAnnotation('Map y');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, xType.node, yType.node);
-    assertLUB(resultType.typeArguments[0]!.node, xType.typeArguments[0]!.node,
-        yType.typeArguments[0]!.node);
-    assertLUB(resultType.typeArguments[1]!.node, xType.typeArguments[1]!.node,
-        yType.typeArguments[1]!.node);
-  }
-
-  Future test_conditionalExpression_generic_lub() async {
-    await analyze('''
-class A {}
-class B extends A {}
-class C extends A {}
-A f(bool b, B x, C y) {
-  return (b ? x : y);
-}
-''');
-    var bType = decoratedTypeAnnotation('B x');
-    var cType = decoratedTypeAnnotation('C y');
-    var bInA = decoratedTypeAnnotation('T/*b*/');
-    var cInA = decoratedTypeAnnotation('T/*c*/');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, bType.node, cType.node);
-    assertLUB(
-        resultType.typeArguments[0]!.node,
-        substitutionNode(bType.typeArguments[0]!.node, bInA.node),
-        substitutionNode(cType.typeArguments[0]!.node, cInA.node));
-  }
-
-  Future test_conditionalExpression_generic_lub_leftSubtype() async {
-    await analyze('''
-class A {}
-class B extends A {}
-A f(bool b, B x, A y) {
-  return (b ? x : y);
-}
-''');
-    var aType = decoratedTypeAnnotation('A y');
-    var bType = decoratedTypeAnnotation('B x');
-    var bInA = decoratedTypeAnnotation('T/*b*/');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, bType.node, aType.node);
-    assertLUB(
-        resultType.typeArguments[0]!.node,
-        substitutionNode(bType.typeArguments[0]!.node, bInA.node),
-        aType.typeArguments[0]!.node);
-  }
-
-  Future test_conditionalExpression_generic_lub_rightSubtype() async {
-    await analyze('''
-class A {}
-class B extends A {}
-A f(bool b, A x, B y) {
-  return (b ? x : y);
-}
-''');
-    var aType = decoratedTypeAnnotation('A x');
-    var bType = decoratedTypeAnnotation('B y');
-    var bInA = decoratedTypeAnnotation('T/*b*/');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, aType.node, bType.node);
-    assertLUB(resultType.typeArguments[0]!.node, aType.typeArguments[0]!.node,
-        substitutionNode(bType.typeArguments[0]!.node, bInA.node));
-  }
-
-  Future test_conditionalExpression_generic_typeParameter_bound() async {
-    await analyze('''
-List f>(bool b, List x, T y) {
-  return (b ? x : y);
-}
-''');
-    var aType = decoratedTypeAnnotation('List x');
-    var bType = decoratedTypeAnnotation('T y');
-    var bBound = decoratedTypeAnnotation('List>');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(
-        resultType.node, aType.node, substitutionNode(bBound.node, bType.node));
-    assertLUB(resultType.typeArguments[0]!.node, aType.typeArguments[0]!.node,
-        bBound.typeArguments[0]!.node);
-  }
-
-  Future test_conditionalExpression_left_never() async {
-    await analyze('''
-List f(bool b, List i) {
-  return (b ? (throw i) : i);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('List i').node;
-    var nullable_conditional =
-        decoratedExpressionType('(b ?')!.node as NullabilityNodeForLUB;
-    var nullable_throw = nullable_conditional.left;
-    assertNoUpstreamNullability(nullable_throw);
-    assertLUB(nullable_conditional, nullable_throw, nullable_i);
-  }
-
-  Future test_conditionalExpression_left_non_null() async {
-    await analyze('''
-int f(bool b, int i) {
-  return (b ? (throw i) : i);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_conditional =
-        decoratedExpressionType('(b ?')!.node as NullabilityNodeForLUB;
-    var nullable_throw = nullable_conditional.left;
-    assertNoUpstreamNullability(nullable_throw);
-    assertLUB(nullable_conditional, nullable_throw, nullable_i);
-  }
-
-  Future test_conditionalExpression_left_null() async {
-    await analyze('''
-int f(bool b, int i) {
-  return (b ? null : i);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, inSet(alwaysPlus), nullable_i);
-  }
-
-  Future test_conditionalExpression_left_null_right_function() async {
-    await analyze('''
-bool Function(int) g(bool b, bool Function(int) f) {
-  return (b ? null : f);
-}
-''');
-
-    var nullable_i =
-        decoratedGenericFunctionTypeAnnotation('bool Function(int) f').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, inSet(alwaysPlus), nullable_i);
-  }
-
-  Future
-      test_conditionalExpression_left_null_right_parameterType() async {
-    await analyze('''
-T g(bool b, T t) {
-  return (b ? null : t);
-}
-''');
-
-    var nullable_t = decoratedTypeAnnotation('T t').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, inSet(alwaysPlus), nullable_t);
-  }
-
-  Future test_conditionalExpression_left_null_right_typeArgs() async {
-    await analyze('''
-List f(bool b, List l) {
-  return (b ? null : l);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('List l').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, inSet(alwaysPlus), nullable_i);
-  }
-
-  Future test_conditionalExpression_nullTyped_nullParameter() async {
-    await analyze('''
-void f(bool b, void Function(Null p) x, void Function(List p) y) {
-  (b ? x : y);
-}
-''');
-    var xType =
-        decoratedGenericFunctionTypeAnnotation('void Function(Null p) x');
-    var yType =
-        decoratedGenericFunctionTypeAnnotation('void Function(List p) y');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, xType.node, yType.node);
-    assertGLB(
-        resultType.positionalParameters![0].node,
-        xType.positionalParameters![0].node,
-        yType.positionalParameters![0].node);
-  }
-
-  Future test_conditionalExpression_parameterType() async {
-    await analyze('''
-T g(bool b, T x, T y) {
-  return (b ? x : y);
-}
-''');
-
-    var nullable_x = decoratedTypeAnnotation('T x').node;
-    var nullable_y = decoratedTypeAnnotation('T y').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, nullable_x, nullable_y);
-  }
-
-  Future test_conditionalExpression_right_never() async {
-    await analyze('''
-List f(bool b, List i) {
-  return (b ? i : (throw i));
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('List i').node;
-    var nullable_conditional =
-        decoratedExpressionType('(b ?')!.node as NullabilityNodeForLUB;
-    var nullable_throw = nullable_conditional.right;
-    assertNoUpstreamNullability(nullable_throw);
-    assertLUB(nullable_conditional, nullable_i, nullable_throw);
-  }
-
-  Future test_conditionalExpression_right_non_null() async {
-    await analyze('''
-int f(bool b, int i) {
-  return (b ? i : (throw i));
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_conditional =
-        decoratedExpressionType('(b ?')!.node as NullabilityNodeForLUB;
-    var nullable_throw = nullable_conditional.right;
-    assertNoUpstreamNullability(nullable_throw);
-    assertLUB(nullable_conditional, nullable_i, nullable_throw);
-  }
-
-  Future test_conditionalExpression_right_null() async {
-    await analyze('''
-int f(bool b, int i) {
-  return (b ? i : null);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, nullable_i, inSet(alwaysPlus));
-  }
-
-  Future test_conditionalExpression_right_null_left_function() async {
-    await analyze('''
-bool Function(int) g(bool b, bool Function(int) f) {
-  return (b ? f : null);
-}
-''');
-
-    var nullable_i =
-        decoratedGenericFunctionTypeAnnotation('bool Function(int) f').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, nullable_i, inSet(alwaysPlus));
-  }
-
-  Future test_conditionalExpression_right_null_left_typeArgs() async {
-    await analyze('''
-List f(bool b, List l) {
-  return (b ? l : null);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('List l').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, nullable_i, inSet(alwaysPlus));
-  }
-
-  Future
-      test_conditionalExpression_right_null_left_typeParameter() async {
-    await analyze('''
-T f(bool b, T t) {
-  return (b ? t : null);
-}
-''');
-
-    var nullable_t = decoratedTypeAnnotation('T t').node;
-    var nullable_conditional = decoratedExpressionType('(b ?')!.node;
-    assertLUB(nullable_conditional, nullable_t, inSet(alwaysPlus));
-  }
-
-  Future test_conditionalExpression_true_guard() async {
-    await analyze('int f(int x, int y, int z) => x == null ? y = z : null;');
-    var guard = decoratedTypeAnnotation('int x').node;
-    assertEdge(decoratedTypeAnnotation('int z').node,
-        decoratedTypeAnnotation('int y').node,
-        hard: false, guards: [guard]);
-    var conditionalDiscard =
-        variables.conditionalDiscard(findNode.conditionalExpression('=='))!;
-    expect(conditionalDiscard, isNotNull);
-    expect(conditionalDiscard.trueGuard, same(guard));
-    expect(conditionalDiscard.falseGuard, isNull);
-  }
-
-  Future test_conditionalExpression_typeParameter_bound() async {
-    await analyze('''
-num f(bool b, num x, T y) {
-  return (b ? x : y);
-}
-''');
-    var aType = decoratedTypeAnnotation('num x');
-    var bType = decoratedTypeAnnotation('T y');
-    var bBound = decoratedTypeAnnotation('num>');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(
-        resultType.node, aType.node, substitutionNode(bBound.node, bType.node));
-  }
-
-  Future test_conditionalExpression_typeParameter_bound_bound() async {
-    await analyze('''
-num f(bool b, num x, T y) {
-  return (b ? x : y);
-}
-''');
-    var aType = decoratedTypeAnnotation('num x');
-    var bType = decoratedTypeAnnotation('T y');
-    var bBound = decoratedTypeAnnotation('R,');
-    var bBoundBound = decoratedTypeAnnotation('num>');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(
-        resultType.node,
-        aType.node,
-        substitutionNode(
-            bBoundBound.node, substitutionNode(bBound.node, bType.node)));
-  }
-
-  Future test_conditionalExpression_typeParameter_dynamic() async {
-    // "dynamic" can short circuit LUB, incorrectly we may lose nullabilities.
-    await analyze('''
-dynamic f(bool b, dynamic x, T y) {
-  return (b ? x : y);
-}
-''');
-    var aType = decoratedTypeAnnotation('dynamic x');
-    var bType = decoratedTypeAnnotation('T y');
-    var bBound = decoratedTypeAnnotation('num>');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(
-        resultType.node, aType.node, substitutionNode(bBound.node, bType.node));
-  }
-
-  Future test_conditionalExpression_typeParameters_bound() async {
-    await analyze('''
-num f(bool b, R x, T y) {
-  return (b ? x : y);
-}
-''');
-    var aType = decoratedTypeAnnotation('R x');
-    var bType = decoratedTypeAnnotation('T y');
-    var aBound = decoratedTypeAnnotation('num>');
-    var bBound = decoratedTypeAnnotation('num,');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(resultType.node, substitutionNode(aBound.node, aType.node),
-        substitutionNode(bBound.node, bType.node));
-  }
-
-  Future
-      test_conditionalExpression_typeParameters_bound_left_to_right() async {
-    await analyze('''
-R f(bool b, R x, T y) {
-  return (b ? x : y);
-}
-''');
-    var aType = decoratedTypeAnnotation('R x');
-    var bType = decoratedTypeAnnotation('T y');
-    var bBound = decoratedTypeAnnotation('R,');
-    var resultType = decoratedExpressionType('(b ?')!;
-    assertLUB(
-        resultType.node, aType.node, substitutionNode(bBound.node, bType.node));
-  }
-
-  Future test_constructor_default_parameter_value_bool() async {
-    await analyze('''
-class C {
-  C([bool b = true]);
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool b').node);
-  }
-
-  Future test_constructor_named() async {
-    await analyze('''
-class C {
-  C.named();
-}
-''');
-    // No assertions; just need to make sure that the test doesn't cause an
-    // exception to be thrown.
-  }
-
-  Future test_constructor_superInitializer() async {
-    await analyze('''
-class C {
-  C.named(int i);
-}
-class D extends C {
-  D(int j) : super.named(j);
-}
-''');
-
-    var namedConstructor = findElement.constructor('named', of: 'C');
-    var constructorType = variables.decoratedElementType(namedConstructor);
-    var constructorParameterType = constructorType.positionalParameters![0];
-    assertEdge(
-        decoratedTypeAnnotation('int j').node, constructorParameterType.node,
-        hard: true);
-  }
-
-  Future test_constructor_superInitializer_withTypeArgument() async {
-    await analyze('''
-class C {
-  C.named(T/*1*/ i);
-}
-class D extends C {
-  D(int/*3*/ j) : super.named(j);
-}
-''');
-
-    var nullable_t1 = decoratedTypeAnnotation('T/*1*/').node;
-    var nullable_int2 = decoratedTypeAnnotation('int/*2*/').node;
-    var nullable_int3 = decoratedTypeAnnotation('int/*3*/').node;
-    assertEdge(nullable_int3, substitutionNode(nullable_int2, nullable_t1),
-        hard: true);
-  }
-
-  Future test_constructor_superInitializer_withTypeVariable() async {
-    await analyze('''
-class C {
-  C.named(T/*1*/ i);
-}
-class D extends C {
-  D(U/*3*/ j) : super.named(j);
-}
-''');
-
-    var nullable_t1 = decoratedTypeAnnotation('T/*1*/').node;
-    var nullable_u2 = decoratedTypeAnnotation('U/*2*/').node;
-    var nullable_u3 = decoratedTypeAnnotation('U/*3*/').node;
-    assertEdge(nullable_u3, substitutionNode(nullable_u2, nullable_t1),
-        hard: true);
-  }
-
-  Future test_constructorDeclaration_returnType_generic() async {
-    await analyze('''
-class C {
-  C();
-}
-''');
-    var constructor = findElement.unnamedConstructor('C');
-    var constructorDecoratedType = variables.decoratedElementType(constructor);
-    _assertType(constructorDecoratedType.type!, 'C Function()');
-    expect(constructorDecoratedType.node, same(never));
-    expect(constructorDecoratedType.typeFormals, isEmpty);
-    expect(constructorDecoratedType.returnType!.node, same(never));
-    _assertType(constructorDecoratedType.returnType!.type!, 'C');
-    var typeArguments = constructorDecoratedType.returnType!.typeArguments;
-    expect(typeArguments, hasLength(2));
-    _assertType(typeArguments[0]!.type!, 'T');
-    expect(typeArguments[0]!.node, same(never));
-    _assertType(typeArguments[1]!.type!, 'U');
-    expect(typeArguments[1]!.node, same(never));
-  }
-
-  Future test_constructorDeclaration_returnType_generic_implicit() async {
-    await analyze('''
-class C {}
-''');
-    var constructor = findElement.unnamedConstructor('C');
-    var constructorDecoratedType = variables.decoratedElementType(constructor);
-    _assertType(constructorDecoratedType.type!, 'C Function()');
-    expect(constructorDecoratedType.node, same(never));
-    expect(constructorDecoratedType.typeFormals, isEmpty);
-    expect(constructorDecoratedType.returnType!.node, same(never));
-    _assertType(constructorDecoratedType.returnType!.type!, 'C');
-    var typeArguments = constructorDecoratedType.returnType!.typeArguments;
-    expect(typeArguments, hasLength(2));
-    _assertType(typeArguments[0]!.type!, 'T');
-    expect(typeArguments[0]!.node, same(never));
-    _assertType(typeArguments[1]!.type!, 'U');
-    expect(typeArguments[1]!.node, same(never));
-  }
-
-  Future test_constructorDeclaration_returnType_simple() async {
-    await analyze('''
-class C {
-  C();
-}
-''');
-    var constructorDecoratedType =
-        variables.decoratedElementType(findElement.unnamedConstructor('C'));
-    _assertType(constructorDecoratedType.type!, 'C Function()');
-    expect(constructorDecoratedType.node, same(never));
-    expect(constructorDecoratedType.typeFormals, isEmpty);
-    expect(constructorDecoratedType.returnType!.node, same(never));
-    expect(constructorDecoratedType.returnType!.typeArguments, isEmpty);
-  }
-
-  Future test_constructorDeclaration_returnType_simple_implicit() async {
-    await analyze('''
-class C {}
-''');
-    var constructorDecoratedType =
-        variables.decoratedElementType(findElement.unnamedConstructor('C'));
-    _assertType(constructorDecoratedType.type!, 'C Function()');
-    expect(constructorDecoratedType.node, same(never));
-    expect(constructorDecoratedType.typeFormals, isEmpty);
-    expect(constructorDecoratedType.returnType!.node, same(never));
-    expect(constructorDecoratedType.returnType!.typeArguments, isEmpty);
-  }
-
-  Future test_constructorFieldInitializer_generic() async {
-    await analyze('''
-class C {
-  C(T/*1*/ x) : f = x;
-  T/*2*/ f;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('T/*1*/').node,
-        decoratedTypeAnnotation('T/*2*/').node,
-        hard: true);
-  }
-
-  Future test_constructorFieldInitializer_simple() async {
-    await analyze('''
-class C {
-  C(int/*1*/ i) : f = i;
-  int/*2*/ f;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int/*1*/').node,
-        decoratedTypeAnnotation('int/*2*/').node,
-        hard: true);
-  }
-
-  Future test_constructorFieldInitializer_via_this() async {
-    await analyze('''
-class C {
-  C(int/*1*/ i) : this.f = i;
-  int/*2*/ f;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int/*1*/').node,
-        decoratedTypeAnnotation('int/*2*/').node,
-        hard: true);
-  }
-
-  Future test_do_while_condition() async {
-    await analyze('''
-void f(bool b) {
-  do {} while (b);
-}
-''');
-
-    assertNullCheck(checkExpression('b);')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-  }
-
-  Future test_doubleLiteral() async {
-    await analyze('''
-double f() {
-  return 1.0;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('double').node);
-  }
-
-  Future test_dummyNode_fromEqualityComparison_left() async {
-    await analyze('''
-f() {
-  int i;
-  if (i == 7) {}
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    assertDummyEdge(nullable_i);
-  }
-
-  Future test_dummyNode_fromEqualityComparison_right() async {
-    await analyze('''
-f() {
-  int i;
-  if (7 == i) {}
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    assertDummyEdge(nullable_i);
-  }
-
-  Future test_dummyNode_fromExpressionStatement() async {
-    await analyze('''
-f() {
-  int i;
-  i;
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    assertDummyEdge(nullable_i);
-  }
-
-  Future test_dummyNode_fromForLoopUpdaters() async {
-    await analyze('''
-f() {
-  int i;
-  int j;
-  for (;; i, j) {}
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_j = decoratedTypeAnnotation('int j').node;
-    assertDummyEdge(nullable_i);
-    assertDummyEdge(nullable_j);
-  }
-
-  Future test_dummyNode_fromForLoopVariables() async {
-    await analyze('''
-f() {
-  int i;
-  for (i;;) {}
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    assertDummyEdge(nullable_i);
-  }
-
-  Future test_edgeOrigin_call_from_function() async {
-    await analyze('''
-void f(int i) {}
-void g(int j) {
-  f(j);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int i').node,
-        hard: true,
-        codeReference:
-            matchCodeRef(offset: findNode.simple('j);').offset, function: 'g'));
-  }
-
-  Future test_edgeOrigin_call_from_method() async {
-    await analyze('''
-class C {
-  void f(int i) {}
-  void g(int j) {
-    f(j);
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int i').node,
-        hard: true,
-        codeReference: matchCodeRef(
-            offset: findNode.simple('j);').offset, function: 'C.g'));
-  }
-
-  Future test_export_metadata() async {
-    await analyze('''
-@deprecated
-export 'dart:async';
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_extension_metadata() async {
-    await analyze('''
-@deprecated
-extension E on String {}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_extension_on_class_with_generic_type_arguments() async {
-    await analyze('''
-class C {}
-void f(C x) {}
-extension E on C {
-  g() => f(this);
-}
-''');
-    // No assertions yet. This test crashes. When it stops crashing, consider
-    // adding assertion(s).
-  }
-
-  Future test_extension_on_function_type() async {
-    await analyze('''
-extension CurryFunction on R Function(S, T) {
-  /// Curry a binary function with its first argument.
-  R Function(T) curry(S first) => (T second) => this(first, second);
-}
-''');
-    // No assertions yet. This test crashes. When it stops crashing, consider
-    // adding assertion(s).
-  }
-
-  Future test_extension_this_non_null_intent_explicit_direct() async {
-    await analyze('''
-extension on int {
-  f() => g(this);
-}
-void g(int i) {}
-''');
-    assertEdge(decoratedTypeAnnotation('int {').node,
-        decoratedTypeAnnotation('int i').node,
-        hard: true);
-  }
-
-  Future test_extension_this_non_null_intent_explicit_method() async {
-    await analyze('''
-extension on int {
-  f() => this.abs();
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node, never, hard: true);
-  }
-
-  Future
-      test_extension_this_non_null_intent_explicit_property_get() async {
-    await analyze('''
-extension on int {
-  f() => this.isEven;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node, never, hard: true);
-  }
-
-  Future
-      test_extension_this_non_null_intent_explicit_property_set() async {
-    await analyze('''
-class C {
-  int x;
-}
-extension on C /*reference*/ {
-  f() {
-    this.x = 0;
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C /*reference*/').node, never,
-        hard: true);
-  }
-
-  Future test_extension_this_non_null_intent_implicit_method() async {
-    await analyze('''
-extension on int {
-  f() => abs();
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node, never, hard: true);
-  }
-
-  Future test_extension_this_non_null_intent_implicit_property() async {
-    await analyze('''
-extension on int {
-  f() => isEven;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int').node, never, hard: true);
-  }
-
-  Future
-      test_extension_this_non_null_intent_implicit_property_set() async {
-    await analyze('''
-class C {
-  int x;
-}
-extension on C /*reference*/ {
-  f() {
-    x = 0;
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C /*reference*/').node, never,
-        hard: true);
-  }
-
-  Future test_field_final_does_not_override_setter() async {
-    await analyze('''
-abstract class A {
-  void set i(int value);
-}
-abstract class C implements A {
-  final int i;
-  C(this.i);
-}
-''');
-    var baseNode = decoratedTypeAnnotation('int value').node;
-    var derivedNode = decoratedTypeAnnotation('int i').node;
-    assertNoEdge(derivedNode, baseNode);
-    assertNoEdge(baseNode, derivedNode);
-  }
-
-  Future test_field_initialized_in_constructor() async {
-    await analyze('''
-class C {
-  int i;
-  C() : i = 0;
-}
-''');
-    // There is no edge from always to the type of i, because it is initialized
-    // in the constructor.
-    assertNoEdge(always, decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_field_metadata() async {
-    await analyze('''
-class A {
-  const A();
-}
-class C {
-  @A()
-  int f;
-}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_field_overrides_field() async {
-    await analyze('''
-abstract class A {
-  int i; // A
-}
-class C implements A {
-  int i; // C
-}
-''');
-    var baseNode = decoratedTypeAnnotation('int i; // A').node;
-    var derivedNode = decoratedTypeAnnotation('int i; // C').node;
-    assertEdge(baseNode, derivedNode, hard: true);
-    assertEdge(derivedNode, baseNode, hard: true);
-  }
-
-  Future test_field_overrides_field_final() async {
-    await analyze('''
-abstract class A {
-  final int i; // A
-  A(this.i);
-}
-class C implements A {
-  int i; // C
-}
-''');
-    var baseNode = decoratedTypeAnnotation('int i; // A').node;
-    var derivedNode = decoratedTypeAnnotation('int i; // C').node;
-    assertEdge(derivedNode, baseNode, hard: true);
-    assertNoEdge(baseNode, derivedNode);
-  }
-
-  Future test_field_overrides_getter() async {
-    await analyze('''
-abstract class A {
-  int get i;
-}
-class C implements A {
-  int i;
-}
-''');
-    var baseNode = decoratedTypeAnnotation('int get i').node;
-    var derivedNode = decoratedTypeAnnotation('int i').node;
-    assertEdge(derivedNode, baseNode, hard: true);
-    assertNoEdge(baseNode, derivedNode);
-  }
-
-  Future test_field_overrides_setter() async {
-    await analyze('''
-abstract class A {
-  void set i(int value);
-}
-class C implements A {
-  int i;
-}
-''');
-    var baseNode = decoratedTypeAnnotation('int value').node;
-    var derivedNode = decoratedTypeAnnotation('int i').node;
-    assertEdge(baseNode, derivedNode, hard: true);
-    assertNoEdge(derivedNode, baseNode);
-  }
-
-  Future test_field_static_implicitInitializer() async {
-    await analyze('''
-class C {
-  static int i;
-}
-''');
-    assertEdge(always, decoratedTypeAnnotation('int').node, hard: false);
-  }
-
-  Future test_field_type_inferred() async {
-    await analyze('''
-int f() => 1;
-class C {
-  var x = f();
-}
-''');
-    var xType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    assertEdge(decoratedTypeAnnotation('int').node, xType.node, hard: false);
-  }
-
-  Future test_fieldFormalParameter_function_typed() async {
-    await analyze('''
-class C {
-  int Function(int, {int j}) f;
-  C(int this.f(int i, {int j}));
-}
-''');
-    var ctorParamType = variables
-        .decoratedElementType(findElement.unnamedConstructor('C'))
-        .positionalParameters![0];
-    var fieldType = variables.decoratedElementType(findElement.field('f'));
-    assertEdge(ctorParamType.node, fieldType.node, hard: true);
-    assertEdge(ctorParamType.returnType!.node, fieldType.returnType!.node,
-        hard: false, checkable: false);
-    assertEdge(fieldType.positionalParameters![0].node,
-        ctorParamType.positionalParameters![0].node,
-        hard: false, checkable: false);
-    assertEdge(fieldType.namedParameters!['j']!.node,
-        ctorParamType.namedParameters!['j']!.node,
-        hard: false, checkable: false);
-  }
-
-  Future test_fieldFormalParameter_typed() async {
-    await analyze('''
-class C {
-  int i;
-  C(int this.i);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int this').node,
-        decoratedTypeAnnotation('int i').node,
-        hard: true);
-  }
-
-  Future test_fieldFormalParameter_untyped() async {
-    await analyze('''
-class C {
-  int i;
-  C.named(this.i);
-}
-''');
-    var decoratedConstructorParamType =
-        decoratedConstructorDeclaration('named').positionalParameters![0];
-    assertEdge(decoratedConstructorParamType.node,
-        decoratedTypeAnnotation('int i').node,
-        hard: true);
-  }
-
-  Future test_firstWhere_edges() async {
-    await analyze('''
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''');
-
-    // Normally there would be an edge from the return type of `() => null` to
-    // a substitution node that pointed to the type argument to the type of `x`,
-    // and another substitution node would point from this to the return type of
-    // `firstEven`.  However, since we may replace `firstWhere` with
-    // `firstWhereOrNull` in order to avoid having to make `x`'s type argument
-    // nullable, we need a synthetic edge to ensure that the return type of
-    // `firstEven` is nullable.
-    var closureReturnType = decoratedExpressionType('() => null')!.returnType!;
-    var firstWhereReturnType = variables
-        .decoratedExpressionType(findNode.methodInvocation('firstWhere'))!;
-    assertEdge(closureReturnType.node, firstWhereReturnType.node, hard: false);
-
-    // There should also be an edge from a substitution node to the return type
-    // of `firstWhere`, to account for the normal data flow (when the element is
-    // found).
-    var typeParameterType = decoratedTypeAnnotation('int>');
-    var firstWhereType = variables.decoratedElementType(findNode
-        .methodInvocation('firstWhere')
-        .methodName
-        .staticElement!
-        .declaration!);
-    assertEdge(
-        substitutionNode(
-            typeParameterType.node, firstWhereType.returnType!.node),
-        firstWhereReturnType.node,
-        hard: false);
-  }
-
-  Future test_for_each_element_with_declaration() async {
-    await analyze('''
-void f(List l) {
-  [for (int i in l) 0];
-}
-''');
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int> l').node, inSet(pointsToNever)),
-        decoratedTypeAnnotation('int i').node,
-        hard: false);
-  }
-
-  Future test_for_each_element_with_declaration_implicit_type() async {
-    await analyze('''
-void f(List l) {
-  [for (var i in l) _g(i)];
-}
-int _g(int j) => 0;
-''');
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var iMatcher = anyNode;
-    assertEdge(iMatcher, jNode, hard: false);
-    var iNode = iMatcher.matchingNode;
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int> l').node, inSet(pointsToNever)),
-        iNode,
-        hard: false);
-  }
-
-  Future test_for_each_element_with_identifier() async {
-    await analyze('''
-void f(List l) {
-  int x;
-  [for (x in l) 0];
-}
-''');
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int> l').node, inSet(pointsToNever)),
-        decoratedTypeAnnotation('int x').node,
-        hard: false);
-  }
-
-  Future test_for_each_on_type_parameter_type() async {
-    await analyze('''
-void f>(T l) {
-  for (int i in l) {}
-}
-''');
-    // TODO(mfairhurst): fix this: https://github.com/dart-lang/sdk/issues/39852
-    //assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(decoratedTypeAnnotation('T l').node, never, hard: true);
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int>').node, inSet(pointsToNever)),
-        decoratedTypeAnnotation('int i').node,
-        hard: false);
-  }
-
-  Future test_for_each_on_type_parameter_type_bound_bound() async {
-    await analyze('''
-void f>(T l) {
-  for (int i in l) {}
-}
-''');
-    // TODO(mfairhurst): fix this: https://github.com/dart-lang/sdk/issues/39852
-    //assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(decoratedTypeAnnotation('T l').node, never, hard: true);
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int>').node, inSet(pointsToNever)),
-        decoratedTypeAnnotation('int i').node,
-        hard: false);
-  }
-
-  Future test_for_each_with_declaration() async {
-    await analyze('''
-void f(List l) {
-  for (int i in l) {}
-}
-''');
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int> l').node, inSet(pointsToNever)),
-        decoratedTypeAnnotation('int i').node,
-        hard: false);
-  }
-
-  Future test_for_each_with_declaration_implicit_type() async {
-    await analyze('''
-void f(List l) {
-  for (var i in l) {
-    _g(i);
-  }
-}
-void _g(int j) {}
-''');
-    var jNode = decoratedTypeAnnotation('int j').node;
-    var iMatcher = anyNode;
-    assertEdge(iMatcher, jNode, hard: false);
-    var iNode = iMatcher.matchingNode;
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int> l').node, inSet(pointsToNever)),
-        iNode,
-        hard: false);
-  }
-
-  Future test_for_each_with_identifier() async {
-    await analyze('''
-void f(List l) {
-  int x;
-  for (x in l) {}
-}
-''');
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(
-        substitutionNode(
-            decoratedTypeAnnotation('int> l').node, inSet(pointsToNever)),
-        decoratedTypeAnnotation('int x').node,
-        hard: false);
-  }
-
-  Future test_for_element_list() async {
-    await analyze('''
-void f(List ints) {
-  [for(int i in ints) i];
-}
-''');
-
-    assertNullCheck(
-        checkExpression('ints) i')!,
-        assertEdge(decoratedTypeAnnotation('List ints').node, never,
-            hard: true));
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int>[').node,
-        hard: false);
-  }
-
-  Future test_for_element_map() async {
-    await analyze('''
-void f(List strs, List ints) {
-  {
-    for (String s in strs)
-      for (int i in ints)
-        s: i,
-  };
-}
-''');
-
-    assertNullCheck(
-        checkExpression('strs)\n')!,
-        assertEdge(decoratedTypeAnnotation('List strs').node, never,
-            hard: true));
-    assertNullCheck(
-        checkExpression('ints)\n')!,
-        assertEdge(decoratedTypeAnnotation('List ints').node, never,
-            hard: false));
-
-    var keyTypeNode = decoratedTypeAnnotation('String, int>{').node;
-    var valueTypeNode = decoratedTypeAnnotation('int>{').node;
-    assertEdge(decoratedTypeAnnotation('String s').node, keyTypeNode,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('int i').node, valueTypeNode,
-        hard: false);
-  }
-
-  Future test_for_element_set() async {
-    await analyze('''
-void f(List ints) {
-  {for(int i in ints) i};
-}
-''');
-
-    assertNullCheck(
-        checkExpression('ints) i')!,
-        assertEdge(decoratedTypeAnnotation('List ints').node, never,
-            hard: true));
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int>{').node,
-        hard: false);
-  }
-
-  Future test_for_with_declaration() async {
-    await analyze('''
-main() {
-  for (int i in [1, 2, 3]) { print(i); }
-}
-''');
-    // No assertions; just checking that it doesn't crash.
-  }
-
-  Future test_for_with_var() async {
-    await analyze('''
-main() {
-  for (var i in [1, 2, 3]) { print(i); }
-}
-''');
-    // No assertions; just checking that it doesn't crash.
-  }
-
-  Future test_forStatement_empty() async {
-    await analyze('''
-
-void test() {
-  for (; ; ) {
-    return;
-  }
-}
-''');
-  }
-
-  Future test_function_assignment() async {
-    await analyze('''
-class C {
-  void f1(String message) {}
-  void f2(String message) {}
-}
-foo(C c, bool flag) {
-  Function(String message) out = flag ? c.f1 : c.f2;
-  out('hello');
-}
-bar() {
-  foo(C(), true);
-  foo(C(), false);
-}
-''');
-    var type = decoratedTypeAnnotation('Function(String message)');
-    expect(type.returnType, isNotNull);
-  }
-
-  Future test_function_metadata() async {
-    await analyze('''
-@deprecated
-void f() {}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_functionDeclaration_expression_body() async {
-    await analyze('''
-int/*1*/ f(int/*2*/ i) => i/*3*/;
-''');
-
-    assertNullCheck(
-        checkExpression('i/*3*/')!,
-        assertEdge(decoratedTypeAnnotation('int/*2*/').node,
-            decoratedTypeAnnotation('int/*1*/').node,
-            hard: true));
-  }
-
-  Future
-      test_functionDeclaration_parameter_named_default_listConst() async {
-    await analyze('''
-void f({List i = const []}) {}
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('List').node);
-    assertEdge(decoratedTypeAnnotation('int/*2*/').node,
-        decoratedTypeAnnotation('int/*1*/').node,
-        hard: true, checkable: false);
-  }
-
-  Future
-      test_functionDeclaration_parameter_named_default_notNull() async {
-    await analyze('''
-void f({int i = 1}) {}
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_functionDeclaration_parameter_named_default_null() async {
-    await analyze('''
-void f({int i = null}) {}
-''');
-
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int').node,
-        hard: false);
-  }
-
-  Future test_functionDeclaration_parameter_named_no_default() async {
-    await analyze('''
-void f({int i}) {}
-''');
-
-    assertEdge(always, decoratedTypeAnnotation('int').node, hard: false);
-  }
-
-  Future
-      test_functionDeclaration_parameter_named_no_default_required() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-void f({@required int i}) {}
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int').node);
-  }
-
-  Future
-      test_functionDeclaration_parameter_named_no_default_required_hint() async {
-    await analyze('''
-void f({/*required*/ int i}) {}
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int').node);
-  }
-
-  Future
-      test_functionDeclaration_parameter_positionalOptional_default_notNull() async {
-    await analyze('''
-void f([int i = 1]) {}
-''');
-
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int').node);
-  }
-
-  Future
-      test_functionDeclaration_parameter_positionalOptional_default_null() async {
-    await analyze('''
-void f([int i = null]) {}
-''');
-
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int').node,
-        hard: false);
-  }
-
-  Future
-      test_functionDeclaration_parameter_positionalOptional_no_default() async {
-    await analyze('''
-void f([int i]) {}
-''');
-
-    assertEdge(always, decoratedTypeAnnotation('int').node, hard: false);
-  }
-
-  Future test_functionExpressionInvocation_bangHint() async {
-    await analyze('''
-int f1(int Function() g1) => g1();
-int f2(int Function() g2) => g2()/*!*/;
-''');
-    assertEdge(decoratedTypeAnnotation('int Function() g1').node,
-        decoratedTypeAnnotation('int f1').node,
-        hard: false);
-    assertNoEdge(decoratedTypeAnnotation('int Function() g2').node,
-        decoratedTypeAnnotation('int f2').node);
-    expect(hasNullCheckHint(findNode.functionExpressionInvocation('g2()')),
-        isTrue);
-  }
-
-  Future test_functionExpressionInvocation_parameterType() async {
-    await analyze('''
-abstract class C {
-  void Function(int) f();
-}
-void g(C c, int i) {
-  c.f()(i);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int)').node,
-        hard: true);
-  }
-
-  Future test_functionExpressionInvocation_returnType() async {
-    await analyze('''
-abstract class C {
-  int Function() f();
-}
-int g(C c) => c.f()();
-''');
-    assertEdge(decoratedTypeAnnotation('int Function').node,
-        decoratedTypeAnnotation('int g').node,
-        hard: false);
-  }
-
-  Future test_functionInvocation_parameter_fromLocalParameter() async {
-    await analyze('''
-void f(int/*1*/ i) {}
-void test(int/*2*/ i) {
-  f(i/*3*/);
-}
-''');
-
-    var int_1 = decoratedTypeAnnotation('int/*1*/');
-    var int_2 = decoratedTypeAnnotation('int/*2*/');
-    var i_3 = checkExpression('i/*3*/')!;
-    assertNullCheck(i_3, assertEdge(int_2.node, int_1.node, hard: true));
-    assertEdge(int_2.node, int_1.node, hard: true);
-  }
-
-  Future test_functionInvocation_parameter_functionTyped() async {
-    await analyze('''
-void _f(void g()) {}
-void test() {
-  _f(null);
-}
-''');
-
-    var parameter = variables.decoratedElementType(
-        findNode.functionTypedFormalParameter('void g()').declaredElement!);
-    assertNullCheck(checkExpression('null')!,
-        assertEdge(inSet(alwaysPlus), parameter.node, hard: false));
-  }
-
-  Future
-      test_functionInvocation_parameter_functionTyped_named_missing() async {
-    await analyze('''
-void f({void g()}) {}
-void h() {
-  f();
-}
-''');
-    var parameter = variables.decoratedElementType(
-        findNode.functionTypedFormalParameter('void g()').declaredElement!);
-    expect(getEdges(always, parameter.node), isNotEmpty);
-  }
-
-  Future test_functionInvocation_parameter_named() async {
-    await analyze('''
-void f({int i = 0}) {}
-void g(int j) {
-  f(i: j/*check*/);
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_j = decoratedTypeAnnotation('int j').node;
-    assertNullCheck(checkExpression('j/*check*/')!,
-        assertEdge(nullable_j, nullable_i, hard: true));
-  }
-
-  Future test_functionInvocation_parameter_named_missing() async {
-    await analyze('''
-void f({int i}) {}
-void g() {
-  f();
-}
-''');
-    var optional_i = decoratedTypeAnnotation('int i').node;
-    expect(getEdges(always, optional_i), isNotEmpty);
-  }
-
-  Future
-      test_functionInvocation_parameter_named_missing_required() async {
-    addMetaPackage();
-    verifyNoTestUnitErrors = false;
-    await analyze('''
-import 'package:meta/meta.dart';
-void f({@required int i}) {}
-void g() {
-  f();
-}
-''');
-    // The call at `f()` is presumed to be in error; no constraint is recorded.
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    assertNoUpstreamNullability(nullable_i);
-  }
-
-  Future
-      test_functionInvocation_parameter_named_missing_required_hint() async {
-    verifyNoTestUnitErrors = false;
-    await analyze('''
-void f({/*required*/ int i}) {}
-void g() {
-  f();
-}
-''');
-    // The call at `f()` is presumed to be in error; no constraint is recorded.
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    assertNoUpstreamNullability(nullable_i);
-  }
-
-  Future test_functionInvocation_parameter_null() async {
-    await analyze('''
-void _f(int i) {}
-void test() {
-  _f(null);
-}
-''');
-
-    assertNullCheck(
-        checkExpression('null')!,
-        assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int').node,
-            hard: false));
-  }
-
-  Future test_functionInvocation_return() async {
-    await analyze('''
-int/*1*/ f() => 0;
-int/*2*/ g() {
-  return (f());
-}
-''');
-
-    assertNullCheck(
-        checkExpression('(f())')!,
-        assertEdge(decoratedTypeAnnotation('int/*1*/').node,
-            decoratedTypeAnnotation('int/*2*/').node,
-            hard: false));
-  }
-
-  Future test_functionInvocation_typeParameter_inferred() async {
-    await analyze('''
-T h(T t) => t;
-T Function(T) get f => h;
-void g() {
-  int y;
-  int x = f(y);
-}
-''');
-    var int_y = decoratedTypeAnnotation('int y').node;
-    var int_x = decoratedTypeAnnotation('int x').node;
-    var t_ret = decoratedTypeAnnotation('T Function').node;
-    var t_param = decoratedTypeAnnotation('T)').node;
-
-    assertEdge(substitutionNode(anyNode, t_ret), int_x, hard: false);
-    assertEdge(int_y, substitutionNode(anyNode, t_param), hard: true);
-  }
-
-  Future test_functionTypeAlias_inExpression() async {
-    await analyze('''
-typedef bool _P(T value);
-bool f(Object x) => x is _P;
-''');
-    // No assertions here; just don't crash. This test can be repurposed for
-    // a more specific test with assertions.
-  }
-
-  Future test_genericMethodInvocation() async {
-    await analyze('''
-class Base {
-  T foo(T x) => x;
-}
-class Derived extends Base {}
-int bar(Derived d, int i) => d.foo(i);
-''');
-    var implicitTypeArgumentMatcher = anyNode;
-    assertEdge(
-        decoratedTypeAnnotation('int i').node,
-        substitutionNode(
-            implicitTypeArgumentMatcher, decoratedTypeAnnotation('T x').node),
-        hard: true);
-    var implicitTypeArgumentNullability =
-        implicitTypeArgumentMatcher.matchingNode;
-    assertEdge(
-        substitutionNode(implicitTypeArgumentNullability,
-            decoratedTypeAnnotation('T foo').node),
-        decoratedTypeAnnotation('int bar').node,
-        hard: false);
-  }
-
-  Future test_genericMethodInvocation_withBoundSubstitution() async {
-    await analyze('''
-class Base {
-  U foo(U x) => x;
-}
-class Derived extends Base> {}
-bar(Derived d, List x) => d.foo(x);
-''');
-    // Don't bother checking any edges; the assertions in the DecoratedType
-    // constructor verify that we've substituted the bound correctly.
-  }
-
-  Future
-      test_genericMethodInvocation_withBoundSubstitution_noFreshParameters() async {
-    await analyze('''
-class Base {
-  U foo(U x) => x;
-}
-class Derived extends Base {}
-int bar(Derived d, int i) => d.foo(i);
-''');
-    var implicitTypeArgumentMatcher = anyNode;
-    assertEdge(
-        decoratedTypeAnnotation('int i').node,
-        substitutionNode(
-            implicitTypeArgumentMatcher, decoratedTypeAnnotation('U x').node),
-        hard: true);
-    var implicitTypeArgumentNullability =
-        implicitTypeArgumentMatcher.matchingNode;
-    assertEdge(
-        substitutionNode(implicitTypeArgumentNullability,
-            decoratedTypeAnnotation('U foo').node),
-        decoratedTypeAnnotation('int bar').node,
-        hard: false);
-  }
-
-  Future test_genericMethodInvocation_withSubstitution() async {
-    await analyze('''
-class Base {
-  U foo(U x, T y) => x;
-}
-class Derived extends Base> {}
-int bar(Derived d, int i, List j) => d.foo(i, j);
-''');
-    assertEdge(
-        decoratedTypeAnnotation('String> j').node,
-        substitutionNode(decoratedTypeAnnotation('String> d').node,
-            decoratedTypeAnnotation('V>>').node),
-        hard: true,
-        checkable: false);
-    assertEdge(
-        decoratedTypeAnnotation('List j').node,
-        substitutionNode(decoratedTypeAnnotation('List>').node,
-            decoratedTypeAnnotation('T y').node),
-        hard: true);
-    var implicitTypeArgumentMatcher = anyNode;
-    assertEdge(
-        decoratedTypeAnnotation('int i').node,
-        substitutionNode(
-            implicitTypeArgumentMatcher, decoratedTypeAnnotation('U x').node),
-        hard: true);
-    var implicitTypeArgumentNullability =
-        implicitTypeArgumentMatcher.matchingNode;
-    assertEdge(
-        substitutionNode(implicitTypeArgumentNullability,
-            decoratedTypeAnnotation('U foo').node),
-        decoratedTypeAnnotation('int bar').node,
-        hard: false);
-  }
-
-  Future test_genericTypeAlias_inExpression() async {
-    await analyze('''
-typedef _P = bool Function(T value);
-bool f(Object x) => x is _P;
-''');
-    // No assertions here; just don't crash. This test can be repurposed for
-    // a more specific test with assertions.
-  }
-
-  Future test_getter_overrides_implicit_getter() async {
-    await analyze('''
-class A {
-  final String/*1*/ s = "x";
-}
-class C implements A {
-  String/*2*/ get s => false ? "y" : null;
-}
-''');
-    var string1 = decoratedTypeAnnotation('String/*1*/');
-    var string2 = decoratedTypeAnnotation('String/*2*/');
-    assertEdge(string2.node, string1.node, hard: true);
-  }
-
-  Future test_if_condition() async {
-    await analyze('''
-void f(bool b) {
-  if (b) {}
-}
-''');
-
-    assertNullCheck(checkExpression('b) {}')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-  }
-
-  Future test_if_conditional_control_flow_after() async {
-    await analyze('''
-void f(bool b, int i, int j) {
-  assert(j != null);
-  if (b) return;
-  assert(i != null);
-}
-''');
-
-    // Asserts after ifs don't demonstrate non-null intent.
-    assertNoEdge(decoratedTypeAnnotation('int i').node, never);
-    // But asserts before ifs do
-    assertEdge(decoratedTypeAnnotation('int j').node, never, hard: true);
-  }
-
-  Future
-      test_if_conditional_control_flow_after_normal_completion() async {
-    await analyze('''
-void f(bool b1, bool b2, int i, int j) {
-  if (b1) {}
-  assert(j != null);
-  if (b2) return;
-  assert(i != null);
-}
-''');
-
-    // Asserts after `if (...) return` s don't demonstrate non-null intent.
-    assertNoEdge(decoratedTypeAnnotation('int i').node, never);
-    // But asserts after `if (...) {}` do, since both branches of the `if`
-    // complete normally, so the assertion is unconditionally reachable.
-    assertEdge(decoratedTypeAnnotation('int j').node, never, hard: true);
-  }
-
-  Future test_if_conditional_control_flow_within() async {
-    await analyze('''
-void f(bool b, int i, int j) {
-  assert(j != null);
-  if (b) {
-    assert(i != null);
-  } else {
-    assert(i != null);
-  }
-}
-''');
-
-    // Asserts inside ifs don't demonstrate non-null intent.
-    assertNoEdge(decoratedTypeAnnotation('int i').node, never);
-    // But asserts outside ifs do.
-    assertEdge(decoratedTypeAnnotation('int j').node, never, hard: true);
-  }
-
-  Future test_if_element_guard_equals_null() async {
-    await analyze('''
-dynamic f(int i, int j, int k) {
-  [if (i == null) j/*check*/ else k/*check*/];
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_j = decoratedTypeAnnotation('int j').node;
-    var nullable_k = decoratedTypeAnnotation('int k').node;
-    var nullable_itemType = decoratedTypeAnnotation('int>[').node;
-    assertNullCheck(
-        checkExpression('j/*check*/')!,
-        assertEdge(nullable_j, nullable_itemType,
-            guards: [nullable_i], hard: false));
-    assertNullCheck(checkExpression('k/*check*/')!,
-        assertEdge(nullable_k, nullable_itemType, hard: false));
-    var discard = elementDiscard('if (i == null)')!;
-    expect(discard.trueGuard, same(nullable_i));
-    expect(discard.falseGuard, null);
-    expect(discard.pureCondition, true);
-  }
-
-  Future test_if_element_list() async {
-    await analyze('''
-void f(bool b) {
-  int i1 = null;
-  int i2 = null;
-  [if (b) i1 else i2];
-}
-''');
-
-    assertNullCheck(checkExpression('b) i1')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-    assertEdge(decoratedTypeAnnotation('int i1').node,
-        decoratedTypeAnnotation('int>[').node,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('int i2').node,
-        decoratedTypeAnnotation('int>[').node,
-        hard: false);
-  }
-
-  Future test_if_element_map() async {
-    await analyze('''
-void f(bool b) {
-  int i1 = null;
-  int i2 = null;
-  String s1 = null;
-  String s2 = null;
-  {if (b) s1: i1 else s2: i2};
-}
-''');
-
-    assertNullCheck(checkExpression('b) s1')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-
-    var keyTypeNode = decoratedTypeAnnotation('String, int>{').node;
-    var valueTypeNode = decoratedTypeAnnotation('int>{').node;
-    assertEdge(decoratedTypeAnnotation('String s1').node, keyTypeNode,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('String s2').node, keyTypeNode,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('int i1').node, valueTypeNode,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('int i2').node, valueTypeNode,
-        hard: false);
-  }
-
-  Future test_if_element_nested() async {
-    await analyze('''
-void f(bool b1, bool b2) {
-  int i1 = null;
-  int i2 = null;
-  int i3 = null;
-  [if (b1) if (b2) i1 else i2 else i3];
-}
-''');
-
-    assertNullCheck(checkExpression('b1)')!,
-        assertEdge(decoratedTypeAnnotation('bool b1').node, never, hard: true));
-    assertNullCheck(
-        checkExpression('b2) i1')!,
-        assertEdge(decoratedTypeAnnotation('bool b2').node, never,
-            hard: false));
-    assertEdge(decoratedTypeAnnotation('int i1').node,
-        decoratedTypeAnnotation('int>[').node,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('int i2').node,
-        decoratedTypeAnnotation('int>[').node,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('int i3').node,
-        decoratedTypeAnnotation('int>[').node,
-        hard: false);
-  }
-
-  Future test_if_element_set() async {
-    await analyze('''
-void f(bool b) {
-  int i1 = null;
-  int i2 = null;
-  {if (b) i1 else i2};
-}
-''');
-
-    assertNullCheck(checkExpression('b) i1')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-    assertEdge(decoratedTypeAnnotation('int i1').node,
-        decoratedTypeAnnotation('int>{').node,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('int i2').node,
-        decoratedTypeAnnotation('int>{').node,
-        hard: false);
-  }
-
-  Future test_if_guard_equals_null() async {
-    await analyze('''
-int f(int i, int j, int k) {
-  if (i == null) {
-    return j/*check*/;
-  } else {
-    return k/*check*/;
-  }
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_j = decoratedTypeAnnotation('int j').node;
-    var nullable_k = decoratedTypeAnnotation('int k').node;
-    var nullable_return = decoratedTypeAnnotation('int f').node;
-    assertNullCheck(
-        checkExpression('j/*check*/')!,
-        assertEdge(nullable_j, nullable_return,
-            guards: [nullable_i], hard: false));
-    assertNullCheck(checkExpression('k/*check*/')!,
-        assertEdge(nullable_k, nullable_return, hard: false));
-    var discard = statementDiscard('if (i == null)')!;
-    expect(discard.trueGuard, same(nullable_i));
-    expect(discard.falseGuard, null);
-    expect(discard.pureCondition, true);
-  }
-
-  Future test_if_simple() async {
-    await analyze('''
-int f(bool b, int i, int j) {
-  if (b) {
-    return i/*check*/;
-  } else {
-    return j/*check*/;
-  }
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_j = decoratedTypeAnnotation('int j').node;
-    var nullable_return = decoratedTypeAnnotation('int f').node;
-    assertNullCheck(checkExpression('i/*check*/')!,
-        assertEdge(nullable_i, nullable_return, hard: false));
-    assertNullCheck(checkExpression('j/*check*/')!,
-        assertEdge(nullable_j, nullable_return, hard: false));
-  }
-
-  Future test_if_without_else() async {
-    await analyze('''
-int f(bool b, int i) {
-  if (b) {
-    return i/*check*/;
-  }
-  return 0;
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_return = decoratedTypeAnnotation('int f').node;
-    assertNullCheck(checkExpression('i/*check*/')!,
-        assertEdge(nullable_i, nullable_return, hard: false));
-  }
-
-  Future test_import_metadata() async {
-    await analyze('''
-@deprecated
-import 'dart:async';
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_indexExpression_bangHint() async {
-    await analyze('''
-abstract class C {
-  int operator[](int index);
-}
-int f1(C c) => c[0];
-int f2(C c) => c[0]/*!*/;
-''');
-    assertEdge(decoratedTypeAnnotation('int operator').node,
-        decoratedTypeAnnotation('int f1').node,
-        hard: false);
-    assertNoEdge(decoratedTypeAnnotation('int operator').node,
-        decoratedTypeAnnotation('int f2').node);
-    expect(hasNullCheckHint(findNode.index('c[0]/*!*/')), isTrue);
-  }
-
-  Future test_indexExpression_dynamic() async {
-    await analyze('''
-int f(dynamic d, int i) {
-  return d[i];
-}
-''');
-    // We assume that the index expression might evaluate to anything, including
-    // `null`.
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_indexExpression_index() async {
-    await analyze('''
-class C {
-  int operator[](int i) => 1;
-}
-int f(C c, int j) => c[j];
-''');
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int i').node,
-        hard: true);
-  }
-
-  Future test_indexExpression_index_cascaded() async {
-    await analyze('''
-class C {
-  int operator[](int i) => 1;
-}
-C f(C c, int j) => c..[j];
-''');
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int i').node,
-        hard: true);
-  }
-
-  Future test_indexExpression_return_type() async {
-    await analyze('''
-class C {
-  int operator[](int i) => 1;
-}
-int f(C c) => c[0];
-''');
-    assertEdge(decoratedTypeAnnotation('int operator').node,
-        decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_indexExpression_target_check() async {
-    await analyze('''
-class C {
-  int operator[](int i) => 1;
-}
-int f(C c) => c[0];
-''');
-    assertNullCheck(checkExpression('c[')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_indexExpression_target_check_cascaded() async {
-    await analyze('''
-class C {
-  int operator[](int i) => 1;
-}
-C f(C c) => c..[0];
-''');
-    assertNullCheck(checkExpression('c..[')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future
-      test_indexExpression_target_demonstrates_non_null_intent() async {
-    await analyze('''
-class C {
-  int operator[](int i) => 1;
-}
-int f(C c) => c[0];
-''');
-    assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true);
-  }
-
-  Future
-      test_indexExpression_target_demonstrates_non_null_intent_cascaded() async {
-    await analyze('''
-class C {
-  int operator[](int i) => 1;
-}
-C f(C c) => c..[0];
-''');
-    assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true);
-  }
-
-  Future test_instanceCreation_generic() async {
-    await analyze('''
-class C {}
-C f() => C();
-''');
-    assertEdge(decoratedTypeAnnotation('int>(').node,
-        decoratedTypeAnnotation('int> f').node,
-        hard: false, checkable: false);
-  }
-
-  Future test_instanceCreation_generic_bound() async {
-    await analyze('''
-class C {}
-C f() => C();
-''');
-    assertEdge(decoratedTypeAnnotation('int>(').node,
-        decoratedTypeAnnotation('int> f').node,
-        hard: false, checkable: false);
-    assertEdge(decoratedTypeAnnotation('int>(').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true);
-  }
-
-  Future test_instanceCreation_generic_dynamic() async {
-    await analyze('''
-class C {}
-C f() => C();
-''');
-    assertEdge(decoratedTypeAnnotation('dynamic').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: false, checkable: false);
-  }
-
-  Future test_instanceCreation_generic_inferredParameterType() async {
-    await analyze('''
-class C {
-  C(List x);
-}
-C f(List x) => C(x);
-''');
-    var edge = assertEdge(anyNode, decoratedTypeAnnotation('int> f').node,
-        hard: false, checkable: false);
-    var inferredTypeArgument = edge.sourceNode;
-    assertEdge(
-        decoratedTypeAnnotation('int> x').node,
-        substitutionNode(
-            inferredTypeArgument, decoratedTypeAnnotation('T> x').node),
-        hard: true,
-        checkable: false);
-  }
-
-  Future test_instanceCreation_generic_parameter() async {
-    await analyze('''
-class C {
-  C(T t);
-}
-f(int i) => C(i/*check*/);
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_c_t = decoratedTypeAnnotation('C').typeArguments[0]!.node;
-    var nullable_t = decoratedTypeAnnotation('T t').node;
-    var check_i = checkExpression('i/*check*/')!;
-    var nullable_c_t_or_nullable_t = check_i.checks.edges[FixReasonTarget.root]!
-        .destinationNode as NullabilityNodeForSubstitution;
-    expect(nullable_c_t_or_nullable_t.innerNode, same(nullable_c_t));
-    expect(nullable_c_t_or_nullable_t.outerNode, same(nullable_t));
-    assertNullCheck(check_i,
-        assertEdge(nullable_i, nullable_c_t_or_nullable_t, hard: true));
-  }
-
-  Future test_instanceCreation_generic_parameter_named() async {
-    await analyze('''
-class C {
-  C({T t});
-}
-f(int i) => C(t: i/*check*/);
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_c_t = decoratedTypeAnnotation('C').typeArguments[0]!.node;
-    var nullable_t = decoratedTypeAnnotation('T t').node;
-    var check_i = checkExpression('i/*check*/')!;
-    var nullable_c_t_or_nullable_t = check_i.checks.edges[FixReasonTarget.root]!
-        .destinationNode as NullabilityNodeForSubstitution;
-    expect(nullable_c_t_or_nullable_t.innerNode, same(nullable_c_t));
-    expect(nullable_c_t_or_nullable_t.outerNode, same(nullable_t));
-    assertNullCheck(check_i,
-        assertEdge(nullable_i, nullable_c_t_or_nullable_t, hard: true));
-  }
-
-  Future test_instanceCreation_implicit_type_params_names() async {
-    await analyze('''
-class C {}
-void main() {
-  C x = C();
-}
-''');
-    var edge0 = assertEdge(
-        anyNode, decoratedTypeAnnotation('C').node,
-        hard: false);
-    expect(edge0.sourceNode!.displayName, 'constructed type (test.dart:3:25)');
-    var edge1 = assertEdge(anyNode, decoratedTypeAnnotation('Object,').node,
-        hard: false, checkable: false);
-    expect(edge1.sourceNode!.displayName,
-        'type argument 0 of constructed type (test.dart:3:25)');
-    var edge2 = assertEdge(anyNode, decoratedTypeAnnotation('Object>').node,
-        hard: false, checkable: false);
-    expect(edge2.sourceNode!.displayName,
-        'type argument 1 of constructed type (test.dart:3:25)');
-  }
-
-  Future test_instanceCreation_parameter_named_optional() async {
-    await analyze('''
-class C {
-  C({int x = 0});
-}
-void f(int y) {
-  C(x: y);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_instanceCreation_parameter_positional_optional() async {
-    await analyze('''
-class C {
-  C([int x]);
-}
-void f(int y) {
-  C(y);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_instanceCreation_parameter_positional_required() async {
-    await analyze('''
-class C {
-  C(int x);
-}
-void f(int y) {
-  C(y);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_integerLiteral() async {
-    await analyze('''
-int f() {
-  return 0;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_invocation_arguments() async {
-    await analyze('''
-int f(Function g, int i, int j) => g(h(i), named: h(j));
-int h(int x) => 0;
-''');
-    // Make sure the appropriate edges get created for the calls to h().
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_invocation_arguments_parenthesized() async {
-    await analyze('''
-int f(Function g, int i, int j) => (g)(h(i), named: h(j));
-int h(int x) => 0;
-''');
-    // Make sure the appropriate edges get created for the calls to h().
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_invocation_dynamic() async {
-    await analyze('''
-int f(dynamic g) => g();
-''');
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_invocation_dynamic_parenthesized() async {
-    await analyze('''
-int f(dynamic g) => (g)();
-''');
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_invocation_function() async {
-    await analyze('''
-int f(Function g) => g();
-''');
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int f').node,
-        hard: false);
-    assertNullCheck(
-        checkExpression('g(')!,
-        assertEdge(decoratedTypeAnnotation('Function g').node, never,
-            hard: true));
-  }
-
-  Future test_invocation_function_parenthesized() async {
-    await analyze('''
-int f(Function g) => (g)();
-''');
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int f').node,
-        hard: false);
-    assertNullCheck(
-        checkExpression('g)(')!,
-        assertEdge(decoratedTypeAnnotation('Function g').node, never,
-            hard: true));
-  }
-
-  Future test_invocation_type_arguments() async {
-    await analyze('''
-int f(Function g) => g>();
-class C {}
-''');
-    // Make sure the appropriate edge gets created for the instantiation of C.
-    assertEdge(decoratedTypeAnnotation('int>').node,
-        decoratedTypeAnnotation('num>').node,
-        hard: true);
-  }
-
-  Future test_invocation_type_arguments_parenthesized() async {
-    await analyze('''
-int f(Function g) => (g)>();
-class C {}
-''');
-    // Make sure the appropriate edge gets created for the instantiation of C.
-    assertEdge(decoratedTypeAnnotation('int>').node,
-        decoratedTypeAnnotation('num>').node,
-        hard: true);
-  }
-
-  @failingTest
-  Future test_isExpression_directlyRelatedTypeParameter() async {
-    await analyze('''
-bool f(List list) => list is List
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool').node);
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: false);
-    assertEdge(decoratedTypeAnnotation('num').node,
-        decoratedTypeAnnotation('int').node,
-        hard: false);
-  }
-
-  Future test_isExpression_genericFunctionType() async {
-    await analyze('''
-bool f(a) => a is int Function(String);
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool').node);
-  }
-
-  @failingTest
-  Future test_isExpression_indirectlyRelatedTypeParameter() async {
-    await analyze('''
-bool f(Iterable iter) => iter is List
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool').node);
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: false);
-    assertEdge(decoratedTypeAnnotation('num').node,
-        decoratedTypeAnnotation('int').node,
-        hard: false);
-  }
-
-  Future test_isExpression_typeName_noTypeArguments() async {
-    await analyze('''
-bool f(a) => a is String;
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool').node);
-    assertEdge(decoratedTypeAnnotation('String').node, never, hard: true);
-  }
-
-  Future test_isExpression_typeName_typeArguments() async {
-    await analyze('''
-bool f(a) => a is List;
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('bool').node);
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertNoEdge(always, decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_library_metadata() async {
-    await analyze('''
-@deprecated
-library foo;
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_libraryDirective() async {
-    await analyze('''
-library foo;
-''');
-    // Passes if no exceptions are thrown.
-  }
-
-  @FailingTest(reason: 'Default list constructor has been removed.')
-  Future test_list_constructor_length() async {
-    await analyze('''
-void main() {
-  List list = List(10);
-}
-''');
-    final variableParam = decoratedTypeAnnotation('int/*1*/');
-    final filledParam = decoratedTypeAnnotation('int/*2*/');
-
-    assertEdge(filledParam.node, variableParam.node,
-        hard: false, checkable: false);
-    assertEdge(always, filledParam.node, hard: false);
-  }
-
-  @FailingTest(reason: 'Default list constructor has been removed.')
-  Future test_list_constructor_length_implicitParam() async {
-    await analyze('''
-void main() {
-  List list = List(10);
-}
-''');
-    final variableParam = decoratedTypeAnnotation('int/*1*/');
-
-    assertEdge(inSet(alwaysPlus), variableParam.node,
-        hard: false, checkable: false);
-  }
-
-  Future test_listLiteral_noTypeArgument_noNullableElements() async {
-    await analyze('''
-List f() {
-  return ['a', 'b'];
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('List').node);
-    final returnTypeNode = decoratedTypeAnnotation('String').node;
-    final returnTypeEdges = getEdges(anyNode, returnTypeNode);
-
-    expect(returnTypeEdges.length, 1);
-    final returnTypeEdge = returnTypeEdges.single;
-
-    final listArgType = returnTypeEdge.sourceNode!;
-    assertNoUpstreamNullability(listArgType);
-    expect(listArgType.displayName, 'list element type (test.dart:2:10)');
-  }
-
-  Future test_listLiteral_noTypeArgument_nullableElement() async {
-    await analyze('''
-List f() {
-  return ['a', null, 'c'];
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('List').node);
-    final returnTypeNode = decoratedTypeAnnotation('String').node;
-    final returnTypeEdges = getEdges(anyNode, returnTypeNode);
-
-    expect(returnTypeEdges.length, 1);
-    final returnTypeEdge = returnTypeEdges.single;
-
-    final listArgType = returnTypeEdge.sourceNode;
-    assertEdge(inSet(alwaysPlus), listArgType, hard: false);
-  }
-
-  Future test_listLiteral_typeArgument_noNullableElements() async {
-    await analyze('''
-List f() {
-  return ['a', 'b'];
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('List').node);
-    var typeArgForLiteral = decoratedTypeAnnotation('String>[').node;
-    var typeArgForReturnType = decoratedTypeAnnotation('String> ').node;
-    assertNoUpstreamNullability(typeArgForLiteral);
-    assertEdge(typeArgForLiteral, typeArgForReturnType,
-        hard: true, checkable: false);
-  }
-
-  Future test_listLiteral_typeArgument_nullableElement() async {
-    await analyze('''
-List f() {
-  return ['a', null, 'c'];
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('List').node);
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('String>[').node,
-        hard: false);
-  }
-
-  Future test_localVariable_type_inferred() async {
-    await analyze('''
-int f() => 1;
-main() {
-  var x = f();
-}
-''');
-    var xType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    assertEdge(decoratedTypeAnnotation('int').node, xType.node, hard: false);
-  }
-
-  Future test_localVariable_unused() async {
-    await analyze('''
-main() {
-  int i;
-}
-''');
-    // There is no edge from always to the type of `i`, because `i` is never
-    // used, so it's ok that it's not initialized.
-    assertNoEdge(always, decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_method_parameterType_inferred() async {
-    await analyze('''
-class B {
-  void f/*B*/(int x) {}
-}
-class C extends B {
-  void f/*C*/(x) {}
-}
-''');
-    var bReturnType = decoratedMethodType('f/*B*/').positionalParameters![0];
-    var cReturnType = decoratedMethodType('f/*C*/').positionalParameters![0];
-    assertEdge(bReturnType.node, cReturnType.node, hard: true);
-  }
-
-  Future test_method_parameterType_inferred_named() async {
-    await analyze('''
-class B {
-  void f/*B*/({int x = 0}) {}
-}
-class C extends B {
-  void f/*C*/({x = 0}) {}
-}
-''');
-    var bReturnType = decoratedMethodType('f/*B*/').namedParameters!['x']!;
-    var cReturnType = decoratedMethodType('f/*C*/').namedParameters!['x']!;
-    assertEdge(bReturnType.node, cReturnType.node, hard: true);
-  }
-
-  Future test_method_returnType_inferred() async {
-    await analyze('''
-class B {
-  int f/*B*/() => 1;
-}
-class C extends B {
-  f/*C*/() => 1;
-}
-''');
-    var bReturnType = decoratedMethodType('f/*B*/').returnType!;
-    var cReturnType = decoratedMethodType('f/*C*/').returnType!;
-    assertEdge(cReturnType.node, bReturnType.node, hard: true);
-  }
-
-  Future
-      test_methodDeclaration_doesntAffect_unconditional_control_flow() async {
-    await analyze('''
-class C {
-  void f(bool b, int i, int j) {
-    assert(i != null);
-    if (b) {}
-    assert(j != null);
-  }
-  void g(int k) {
-    assert(k != null);
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-    assertEdge(decoratedTypeAnnotation('int j').node, never, hard: true);
-    assertEdge(decoratedTypeAnnotation('int k').node, never, hard: true);
-  }
-
-  Future
-      test_methodDeclaration_resets_unconditional_control_flow() async {
-    await analyze('''
-class C {
-  void _f(bool b, int i, int j) {
-    assert(i != null);
-    if (b) return;
-    assert(j != null);
-  }
-  void _g(int k) {
-    assert(k != null);
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int j').node, never);
-    assertEdge(always, decoratedTypeAnnotation('int j').node, hard: false);
-    assertEdge(decoratedTypeAnnotation('int k').node, never, hard: true);
-  }
-
-  Future test_methodInvocation_bangHint() async {
-    await analyze('''
-abstract class C {
-  int m1();
-  int m2();
-}
-int f1(C c) => c.m1();
-int f2(C c) => c.m2()/*!*/;
-''');
-    assertEdge(decoratedTypeAnnotation('int m1').node,
-        decoratedTypeAnnotation('int f1').node,
-        hard: false);
-    assertNoEdge(decoratedTypeAnnotation('int m2').node,
-        decoratedTypeAnnotation('int f2').node);
-    expect(hasNullCheckHint(findNode.methodInvocation('c.m2')), isTrue);
-  }
-
-  Future test_methodInvocation_call_functionTyped() async {
-    await analyze('''
-void f(void Function(int x) callback, int y) => callback.call(y);
-''');
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_methodInvocation_call_interfaceTyped() async {
-    // Make sure that we don't try to treat all methods called `call` as though
-    // the underlying type is a function type.
-    await analyze('''
-abstract class C {
-  void call(int x);
-}
-void f(C c, int y) => c.call(y);
-''');
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_methodInvocation_dynamic() async {
-    await analyze('''
-class C {
-  int g(int i) => i;
-}
-int f(dynamic d, int j) {
-  return d.g(j);
-}
-''');
-    // The call `d.g(j)` is dynamic, so we can't tell what method it resolves
-    // to.  There's no reason to assume it resolves to `C.g`.
-    assertNoEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int i').node);
-    assertNoEdge(decoratedTypeAnnotation('int g').node,
-        decoratedTypeAnnotation('int f').node);
-    // We do, however, assume that it might return anything, including `null`.
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_methodInvocation_dynamic_arguments() async {
-    await analyze('''
-int f(dynamic d, int i, int j) {
-  return d.g(h(i), named: h(j));
-}
-int h(int x) => 0;
-''');
-    // Make sure the appropriate edges get created for the calls to h().
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int j').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_methodInvocation_dynamic_type_arguments() async {
-    await analyze('''
-int f(dynamic d, int i, int j) {
-  return d.g>();
-}
-class C {}
-''');
-    // Make sure the appropriate edge gets created for the instantiation of C.
-    assertEdge(decoratedTypeAnnotation('int>').node,
-        decoratedTypeAnnotation('num>').node,
-        hard: true);
-  }
-
-  Future test_methodInvocation_extension_conflict() async {
-    await analyze('''
-class C {
-  void f(int w) {}
-}
-extension E on C {
-  void f(int x) {}
-  void g(int y) {
-    this.f(y);
-  }
-  void h(int z) {
-    f(z);
-  }
-}
-''');
-    // `this.f(y)` refers to [C.f], not [E.f].
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int w').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node);
-
-    // `f(z)` refers to [E.f], not [C.f].
-    assertEdge(decoratedTypeAnnotation('int z').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int z').node,
-        decoratedTypeAnnotation('int w').node);
-  }
-
-  Future test_methodInvocation_extension_explicitThis() async {
-    await analyze('''
-class C {
-  void f(int x) {}
-}
-extension E on C {
-  void g(int y) {
-    this.f(y);
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_methodInvocation_extension_implicitThis() async {
-    await analyze('''
-class C {
-  void f(int x) {}
-}
-extension E on C {
-  void g(int y) {
-    f(y);
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_methodInvocation_extension_nullTarget() async {
-    await analyze('''
-class C {}
-extension on C /*1*/ {
-  void m() {}
-}
-void f() {
-  C c = null;
-  c.m();
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C c').node,
-        decoratedTypeAnnotation('C /*1*/').node,
-        hard: true);
-  }
-
-  Future test_methodInvocation_extension_unnamed() async {
-    await analyze('''
-class C {
-  void f(int x) {}
-}
-extension on C {
-  void g(int y) {
-    f(y);
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-  }
-
-  Future test_methodInvocation_generic_onResultOfImplicitSuper() async {
-    await analyze('''
-class Base {
-  Base noop() => this;
-}
-
-class Sub extends Base {
-  void implicitSuper() => noop().noop();
-}
-''');
-    // Don't bother checking any edges; the assertions in the DecoratedType
-    // constructor verify that we've substituted the bound correctly.
-  }
-
-  Future test_methodInvocation_implicitSuper_generic() async {
-    await analyze('''
-class Base {
-  Base f(T1 x) => this;
-}
-
-class Sub extends Base {
-  void g() => f(null);
-}
-''');
-    assertEdge(
-        inSet(alwaysPlus),
-        substitutionNode(
-          substitutionNode(
-            anyNode, // non-null for `this`.
-            decoratedTypeAnnotation('T2> {').node,
-          ),
-          decoratedTypeAnnotation('T1 x').node,
-        ),
-        hard: false);
-  }
-
-  Future test_methodInvocation_implicitSuper_tearOff() async {
-    await analyze('''
-class Base {
-  Base f(T1 x) => this;
-}
-
-class Sub extends Base {
-  void g() => (f)(null);
-}
-''');
-    assertEdge(
-        inSet(alwaysPlus),
-        substitutionNode(
-          substitutionNode(
-            anyNode, // non-null for `this`.
-            decoratedTypeAnnotation('T2> {').node,
-          ),
-          decoratedTypeAnnotation('T1 x').node,
-        ),
-        hard: false);
-  }
-
-  Future test_methodInvocation_mixin_super() async {
-    await analyze('''
-class C {
-  void f(int x) {}
-}
-mixin D on C {
-  void g(int y) {
-    super.f(y);
-  }
-  @override
-  void f(int z) {
-  }
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int z').node);
-  }
-
-  Future test_methodInvocation_object_method() async {
-    await analyze('''
-String f(int i) => i.toString();
-''');
-    // No edge from i to `never` because it is safe to call `toString` on
-    // `null`.
-    assertNoEdge(decoratedTypeAnnotation('int').node, never);
-  }
-
-  Future
-      test_methodInvocation_object_method_on_non_interface_type() async {
-    await analyze('''
-String f(void Function() g) => g.toString();
-''');
-    var toStringReturnType = variables
-        .decoratedElementType(
-            typeProvider.objectType.element.getMethod('toString')!)
-        .returnType!;
-    assertEdge(
-        toStringReturnType.node, decoratedTypeAnnotation('String f').node,
-        hard: false);
-  }
-
-  Future test_methodInvocation_parameter_contravariant() async {
-    await analyze('''
-class C {
-  void f(T t) {}
-}
-void g(C c, int i) {
-  c.f(i/*check*/);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_c_t = decoratedTypeAnnotation('C').typeArguments[0]!.node;
-    var nullable_t = decoratedTypeAnnotation('T t').node;
-    var check_i = checkExpression('i/*check*/')!;
-    var nullable_c_t_or_nullable_t = check_i.checks.edges[FixReasonTarget.root]!
-        .destinationNode as NullabilityNodeForSubstitution;
-    expect(nullable_c_t_or_nullable_t.innerNode, same(nullable_c_t));
-    expect(nullable_c_t_or_nullable_t.outerNode, same(nullable_t));
-    assertNullCheck(check_i,
-        assertEdge(nullable_i, nullable_c_t_or_nullable_t, hard: true));
-  }
-
-  Future
-      test_methodInvocation_parameter_contravariant_from_migrated_class() async {
-    await analyze('''
-void f(List x, int i) {
-  x.add(i/*check*/);
-}
-''');
-
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_list_t =
-        decoratedTypeAnnotation('List').typeArguments[0]!.node;
-    var addMethod =
-        findNode.methodInvocation('x.add').methodName.staticElement!;
-    var nullable_t = variables
-        .decoratedElementType(addMethod.declaration!)
-        .positionalParameters![0]
-        .node;
-    assertEdge(nullable_t, never, hard: true, checkable: false);
-    var check_i = checkExpression('i/*check*/')!;
-    var nullable_list_t_or_nullable_t = check_i
-        .checks
-        .edges[FixReasonTarget.root]!
-        .destinationNode as NullabilityNodeForSubstitution;
-    expect(nullable_list_t_or_nullable_t.innerNode, same(nullable_list_t));
-    expect(nullable_list_t_or_nullable_t.outerNode, same(nullable_t));
-    assertNullCheck(check_i,
-        assertEdge(nullable_i, nullable_list_t_or_nullable_t, hard: true));
-  }
-
-  Future test_methodInvocation_parameter_contravariant_function() async {
-    await analyze('''
-void f(T t) {}
-void g(int i) {
-  f(i/*check*/);
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_f_t = decoratedTypeAnnotation('int>').node;
-    var nullable_t = decoratedTypeAnnotation('T t').node;
-    var check_i = checkExpression('i/*check*/')!;
-    var nullable_f_t_or_nullable_t = check_i.checks.edges[FixReasonTarget.root]!
-        .destinationNode as NullabilityNodeForSubstitution;
-    expect(nullable_f_t_or_nullable_t.innerNode, same(nullable_f_t));
-    expect(nullable_f_t_or_nullable_t.outerNode, same(nullable_t));
-    assertNullCheck(check_i,
-        assertEdge(nullable_i, nullable_f_t_or_nullable_t, hard: true));
-  }
-
-  Future test_methodInvocation_parameter_generic() async {
-    await analyze('''
-class C {}
-void f(C/*2*/ c) {}
-void g(C/*4*/ c) {
-  f(c/*check*/);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int/*3*/').node,
-        decoratedTypeAnnotation('int/*1*/').node,
-        hard: true, checkable: false);
-    assertNullCheck(
-        checkExpression('c/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('C/*4*/').node,
-            decoratedTypeAnnotation('C/*2*/').node,
-            hard: true));
-  }
-
-  Future test_methodInvocation_parameter_named() async {
-    await analyze('''
-class C {
-  void f({int i = 0}) {}
-}
-void g(C c, int j) {
-  c.f(i: j/*check*/);
-}
-''');
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_j = decoratedTypeAnnotation('int j').node;
-    assertNullCheck(checkExpression('j/*check*/')!,
-        assertEdge(nullable_j, nullable_i, hard: true));
-  }
-
-  Future test_methodInvocation_parameter_named_differentPackage() async {
-    addPackageFile('foo', 'c.dart', '''
-class C {
-  void f({int i}) {}
-}
-''');
-    await analyze('''
-import "package:foo/c.dart";
-void g(C c, int j) {
-  c.f(i: j/*check*/);
-}
-''');
-    var nullable_j = decoratedTypeAnnotation('int j');
-    assertNullCheck(checkExpression('j/*check*/')!,
-        assertEdge(nullable_j.node, inSet(pointsToNever), hard: true));
-  }
-
-  Future test_methodInvocation_promoted_in_new_flow_analysis() async {
-    await analyze('''
-class C {
-  void f(T t) {}
-}
-void g(C c, int i) {
-  if (c is! C) {
-    return;
-  }
-
-  c.f(i/*check*/);
-}
-''');
-
-    // Mostly here to check DecoratedType's assertions, but here are some edge
-    // checks anyways.
-    var nullable_i = decoratedTypeAnnotation('int i').node;
-    var nullable_t = decoratedTypeAnnotation('T t').node;
-    assertEdge(nullable_i, substitutionNode(anyNode, nullable_t), hard: false);
-  }
-
-  Future test_methodInvocation_resolves_to_getter() async {
-    await analyze('''
-abstract class C {
-  int/*1*/ Function(int/*2*/ i) get f;
-}
-int/*3*/ g(C c, int/*4*/ i) => c.f(i);
-''');
-    assertEdge(decoratedTypeAnnotation('int/*4*/').node,
-        decoratedTypeAnnotation('int/*2*/').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int/*1*/').node,
-        decoratedTypeAnnotation('int/*3*/').node,
-        hard: false);
-  }
-
-  Future test_methodInvocation_return_type() async {
-    await analyze('''
-class C {
-  bool m() => true;
-}
-bool f(C c) => c.m();
-''');
-    assertEdge(decoratedTypeAnnotation('bool m').node,
-        decoratedTypeAnnotation('bool f').node,
-        hard: false);
-  }
-
-  Future test_methodInvocation_return_type_generic_function() async {
-    await analyze('''
-T f(T t) => t;
-int g() => (f(1));
-''');
-    var check_i = checkExpression('(f(1))')!;
-    var t_bound = decoratedTypeAnnotation('Object').node;
-    var nullable_f_t = decoratedTypeAnnotation('int>').node;
-    var nullable_f_t_or_nullable_t = check_i.checks.edges[FixReasonTarget.root]!
-        .sourceNode as NullabilityNodeForSubstitution;
-    var nullable_t = decoratedTypeAnnotation('T f').node;
-    expect(nullable_f_t_or_nullable_t.innerNode, same(nullable_f_t));
-    expect(nullable_f_t_or_nullable_t.outerNode, same(nullable_t));
-    var nullable_return = decoratedTypeAnnotation('int g').node;
-    assertNullCheck(check_i,
-        assertEdge(nullable_f_t_or_nullable_t, nullable_return, hard: false));
-    assertEdge(nullable_f_t, t_bound, hard: true);
-  }
-
-  Future test_methodInvocation_return_type_null_aware() async {
-    await analyze('''
-class C {
-  bool m() => true;
-}
-bool f(C c) => (c?.m());
-''');
-    var lubNode =
-        decoratedExpressionType('(c?.m())')!.node as NullabilityNodeForLUB;
-    expect(lubNode.left, same(decoratedTypeAnnotation('C c').node));
-    expect(lubNode.right, same(decoratedTypeAnnotation('bool m').node));
-    assertEdge(lubNode, decoratedTypeAnnotation('bool f').node, hard: false);
-  }
-
-  Future test_methodInvocation_static_on_generic_class() async {
-    await analyze('''
-class C {
-  static int f(int x) => 0;
-}
-int g(int y) => C.f(y);
-''');
-    assertEdge(decoratedTypeAnnotation('int y').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int f').node,
-        decoratedTypeAnnotation('int g').node,
-        hard: false);
-  }
-
-  Future test_methodInvocation_target_check() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(C c) {
-  c.m();
-}
-''');
-
-    assertNullCheck(checkExpression('c.m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_methodInvocation_target_check_cascaded() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(C c) {
-  c..m();
-}
-''');
-
-    assertNullCheck(checkExpression('c..m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future
-      test_methodInvocation_target_demonstrates_non_null_intent() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(C c) {
-  c.m();
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true);
-  }
-
-  Future
-      test_methodInvocation_target_demonstrates_non_null_intent_cascaded() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(C c) {
-  c..m();
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true);
-  }
-
-  Future test_methodInvocation_target_generic_in_base_class() async {
-    await analyze('''
-abstract class B {
-  void m(T/*1*/ t);
-}
-abstract class C extends B {}
-void f(C c, int/*3*/ i) {
-  c.m(i);
-}
-''');
-    // nullable(3) -> substitute(nullable(2), nullable(1))
-    var nullable1 = decoratedTypeAnnotation('T/*1*/').node;
-    var nullable2 = decoratedTypeAnnotation('int/*2*/').node;
-    var nullable3 = decoratedTypeAnnotation('int/*3*/').node;
-    assertEdge(nullable3, substitutionNode(nullable2, nullable1), hard: true);
-  }
-
-  Future test_methodInvocation_typeParameter_inferred() async {
-    await analyze('''
-T f(T t) => t;
-void g() {
-  int y;
-  int x = f(y);
-}
-''');
-    var int_y = decoratedTypeAnnotation('int y').node;
-    var int_x = decoratedTypeAnnotation('int x').node;
-    var t_ret = decoratedTypeAnnotation('T f').node;
-    var t_param = decoratedTypeAnnotation('T t').node;
-
-    assertEdge(substitutionNode(anyNode, t_ret), int_x, hard: false);
-    assertEdge(int_y, substitutionNode(anyNode, t_param), hard: true);
-    assertEdge(t_param, t_ret, hard: true);
-  }
-
-  @failingTest
-  Future
-      test_methodInvocation_typeParameter_inferred_inGenericClass() async {
-    // this creates an edge case because the typeArguments are not equal in
-    // length the typeFormals of the calleeType, due to the enclosing
-    // generic class.
-    await analyze('''
-class C {
- void g() {
-   // use a local fn because generic methods aren't implemented.
-   T f(T t) => t;
-   int y;
-   int x = f(y);
- }
-}
-''');
-    var int_y = decoratedTypeAnnotation('int y').node;
-    var int_x = decoratedTypeAnnotation('int x').node;
-    var t_ret = decoratedTypeAnnotation('T f').node;
-    var t_param = decoratedTypeAnnotation('T t').node;
-
-    assertEdge(int_y, t_param, hard: true);
-    assertEdge(t_param, t_ret, hard: true);
-    assertEdge(t_ret, int_x, hard: false);
-  }
-
-  @failingTest
-  Future
-      test_methodInvocation_typeParameter_inferred_inGenericExtreme() async {
-    // this creates an edge case because the typeArguments are not equal in
-    // length the typeFormals of the calleeType, due to the enclosing
-    // generic class/functions.
-    await analyze('''
-class C {
- void g() {
-   // use local fns because generic methods aren't implemented.
-   void f2() {
-     void f3() {
-       T f(T t) => t;
-       int y;
-       int x = f(y);
-     }
-   }
- }
-}
-''');
-    var int_y = decoratedTypeAnnotation('int y').node;
-    var int_x = decoratedTypeAnnotation('int x').node;
-    var t_ret = decoratedTypeAnnotation('T f').node;
-    var t_param = decoratedTypeAnnotation('T t').node;
-
-    assertEdge(int_y, t_param, hard: true);
-    assertEdge(t_param, t_ret, hard: true);
-    assertEdge(t_ret, int_x, hard: false);
-  }
-
-  Future test_methodInvocation_variable_typeParameter_inferred() async {
-    await analyze('''
-T h(T t) => t;
-class C {
-  void g() {
-    T Function(T) f = h;
-    int y;
-    int x = f(y);
-  }
-}
-''');
-    var int_y = decoratedTypeAnnotation('int y').node;
-    var int_x = decoratedTypeAnnotation('int x').node;
-    var t_ret = decoratedTypeAnnotation('T Function').node;
-    var t_param = decoratedTypeAnnotation('T)').node;
-
-    assertEdge(substitutionNode(anyNode, t_ret), int_x, hard: false);
-    assertEdge(int_y, substitutionNode(anyNode, t_param), hard: true);
-  }
-
-  Future test_never() async {
-    await analyze('');
-
-    expect(never.isNullable, isFalse);
-  }
-
-  Future test_override_mixin_method() async {
-    await analyze('''
-  mixin M {
-    int m(int/*1*/ x);
-  }
-
-  class C with M {
-    @override
-    int m(int/*2*/ x) => x;
-  }
-    ''');
-    final int1 = decoratedTypeAnnotation('int/*1*/');
-    final int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int1.node, int2.node, hard: false, checkable: false);
-  }
-
-  Future test_override_parameter_function_typed() async {
-    await analyze('''
-abstract class Base {
-  void f(void g(int i)/*1*/);
-}
-class Derived extends Base {
-  void f(void g(int i)/*2*/) {}
-}
-''');
-    var p1 = variables.decoratedElementType(findNode
-        .functionTypedFormalParameter('void g(int i)/*1*/')
-        .declaredElement!);
-    var p2 = variables.decoratedElementType(findNode
-        .functionTypedFormalParameter('void g(int i)/*2*/')
-        .declaredElement!);
-    assertEdge(p1.node, p2.node, hard: false, checkable: false);
-  }
-
-  Future test_override_parameter_type_named() async {
-    await analyze('''
-abstract class Base {
-  void f({int/*1*/ i});
-}
-class Derived extends Base {
-  void f({int/*2*/ i}) {}
-}
-''');
-    var int1 = decoratedTypeAnnotation('int/*1*/');
-    var int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int1.node, int2.node, hard: false, checkable: false);
-  }
-
-  Future test_override_parameter_type_named_over_none() async {
-    await analyze('''
-abstract class Base {
-  void f();
-}
-class Derived extends Base {
-  void f({int i}) {}
-}
-''');
-    // No assertions; just checking that it doesn't crash.
-  }
-
-  Future test_override_parameter_type_operator() async {
-    await analyze('''
-abstract class Base {
-  Base operator+(Base/*1*/ b);
-}
-class Derived extends Base {
-  Base operator+(Base/*2*/ b) => this;
-}
-''');
-    var base1 = decoratedTypeAnnotation('Base/*1*/');
-    var base2 = decoratedTypeAnnotation('Base/*2*/');
-    assertEdge(base1.node, base2.node, hard: false, checkable: false);
-  }
-
-  Future test_override_parameter_type_optional() async {
-    await analyze('''
-abstract class Base {
-  void f([int/*1*/ i]);
-}
-class Derived extends Base {
-  void f([int/*2*/ i]) {}
-}
-''');
-    var int1 = decoratedTypeAnnotation('int/*1*/');
-    var int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int1.node, int2.node, hard: false, checkable: false);
-  }
-
-  Future test_override_parameter_type_optional_over_none() async {
-    await analyze('''
-abstract class Base {
-  void f();
-}
-class Derived extends Base {
-  void f([int i]) {}
-}
-''');
-    // No assertions; just checking that it doesn't crash.
-  }
-
-  Future test_override_parameter_type_optional_over_required() async {
-    await analyze('''
-abstract class Base {
-  void f(int/*1*/ i);
-}
-class Derived extends Base {
-  void f([int/*2*/ i]) {}
-}
-''');
-    var int1 = decoratedTypeAnnotation('int/*1*/');
-    var int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int1.node, int2.node, hard: false, checkable: false);
-  }
-
-  Future test_override_parameter_type_required() async {
-    await analyze('''
-abstract class Base {
-  void f(int/*1*/ i);
-}
-class Derived extends Base {
-  void f(int/*2*/ i) {}
-}
-''');
-    var int1 = decoratedTypeAnnotation('int/*1*/');
-    var int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int1.node, int2.node, hard: false, checkable: false);
-  }
-
-  Future test_override_parameter_type_setter() async {
-    await analyze('''
-abstract class Base {
-  void set x(int/*1*/ value);
-}
-class Derived extends Base {
-  void set x(int/*2*/ value) {}
-}
-''');
-    var int1 = decoratedTypeAnnotation('int/*1*/');
-    var int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int1.node, int2.node, hard: false, checkable: false);
-  }
-
-  Future test_override_return_type_getter() async {
-    await analyze('''
-abstract class Base {
-  int/*1*/ get x;
-}
-class Derived extends Base {
-  int/*2*/ get x => null;
-}
-''');
-    var int1 = decoratedTypeAnnotation('int/*1*/');
-    var int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int2.node, int1.node, hard: true);
-  }
-
-  Future test_override_return_type_method() async {
-    await analyze('''
-abstract class Base {
-  int/*1*/ f();
-}
-class Derived extends Base {
-  int/*2*/ f() => null;
-}
-''');
-    var int1 = decoratedTypeAnnotation('int/*1*/');
-    var int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int2.node, int1.node, hard: true);
-  }
-
-  Future test_override_return_type_operator() async {
-    await analyze('''
-abstract class Base {
-  Base/*1*/ operator-();
-}
-class Derived extends Base {
-  Derived/*2*/ operator-() => null;
-}
-''');
-    var base1 = decoratedTypeAnnotation('Base/*1*/');
-    var derived2 = decoratedTypeAnnotation('Derived/*2*/');
-    assertEdge(derived2.node, base1.node, hard: true);
-  }
-
-  Future test_parameter_field_metadata() async {
-    await analyze('''
-const bar = null;
-class C {
-  int foo;
-  C(@bar this.foo);
-}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_parameter_named_field_metadata() async {
-    await analyze('''
-const bar = null;
-class C {
-  int foo;
-  C({@bar this.foo});
-}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_parameter_named_field_with_default_metadata() async {
-    await analyze('''
-const bar = null;
-class C {
-  int foo;
-  C({@bar this.foo = 0});
-}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_parameter_named_metadata() async {
-    await analyze('''
-void f({@deprecated int foo}) {}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_parameter_named_with_default_metadata() async {
-    await analyze('''
-void f({@deprecated int foo = 0}) {}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_parameter_normal_metadata() async {
-    await analyze('''
-const foo = null;
-void f(@foo int foo) {}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_parameter_optional_positional_field_metadata() async {
-    await analyze('''
-const bar = null;
-class C {
-  int foo;
-  C([@bar this.foo]);
-}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_parameter_optional_positional_metadata() async {
-    await analyze('''
-const foo = null;
-void f([@foo int foo]) {}
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_parenthesizedExpression() async {
-    await analyze('''
-int f() {
-  return (null);
-}
-''');
-
-    assertNullCheck(
-        checkExpression('(null)')!,
-        assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int').node,
-            hard: false));
-  }
-
-  Future test_parenthesizedExpression_bangHint() async {
-    await analyze('''
-int f1(int i1) => (i1);
-int f2(int i2) => (i2)/*!*/;
-''');
-    assertEdge(decoratedTypeAnnotation('int i1').node,
-        decoratedTypeAnnotation('int f1').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int i2').node,
-        decoratedTypeAnnotation('int f2').node);
-    expect(hasNullCheckHint(findNode.parenthesized('(i2)')), isTrue);
-  }
-
-  Future test_part_metadata() async {
-    var pathContext = resourceProvider.pathContext;
-    addSource(pathContext.join(pathContext.dirname(testFile), 'part.dart'), '''
-part of 'test.dart';
-''');
-    await analyze('''
-@deprecated
-part 'part.dart';
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_part_of_identifier() async {
-    var pathContext = resourceProvider.pathContext;
-    var testFileName = pathContext.basename(testFile);
-    var libPath = pathContext.join(pathContext.dirname(testFile), 'lib.dart');
-    addSource(libPath, '''
-library test;
-part '$testFileName';
-''');
-    // Discover the library for the part.
-    session.getParsedUnit(libPath);
-    await analyze('''
-part of test;
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_part_of_metadata() async {
-    var pathContext = resourceProvider.pathContext;
-    var testFileName = pathContext.basename(testFile);
-    var libPath = pathContext.join(pathContext.dirname(testFile), 'lib.dart');
-    addSource(libPath, '''
-part '$testFileName';
-''');
-    // TODO(scheglov) This should not be necessary, we use URI, so can find it.
-    // Discover the library for the part.
-    session.getParsedUnit(libPath);
-    await analyze('''
-@deprecated
-part of 'lib.dart';
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_part_of_path() async {
-    var pathContext = resourceProvider.pathContext;
-    var testFileName = pathContext.basename(testFile);
-    var libPath = pathContext.join(pathContext.dirname(testFile), 'lib.dart');
-    addSource(libPath, '''
-part '$testFileName';
-''');
-    // TODO(scheglov) This should not be necessary, we use URI, so can find it.
-    // Discover the library for the part.
-    session.getParsedUnit(libPath);
-    await analyze('''
-part of 'lib.dart';
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_postDominators_assert() async {
-    await analyze('''
-void test(bool b1, bool b2, bool b3, bool _b) {
-  assert(b1 != null);
-  if (_b) {
-    assert(b2 != null);
-  }
-  assert(b3 != null);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('bool b1').node, never, hard: true);
-    assertNoEdge(decoratedTypeAnnotation('bool b2').node, never);
-    assertEdge(decoratedTypeAnnotation('bool b3').node, never, hard: true);
-  }
-
-  Future
-      test_postDominators_assignment_with_same_var_on_lhs_and_in_rhs() async {
-    await analyze('''
-void f(int i) {
-  i = g(i);
-}
-int g(int j) => 0;
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int j').node,
-        hard: true);
-  }
-
-  Future test_postDominators_break() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(bool b1, C _c) {
-  while (b1/*check*/) {
-    bool b2 = b1;
-    C c = _c;
-    if (b2/*check*/) {
-      break;
-    }
-    c.m();
-  }
-}
-''');
-
-    assertNullCheck(checkExpression('b1/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b1').node, never, hard: true));
-    assertNullCheck(checkExpression('b2/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b2').node, never, hard: true));
-    assertNullCheck(checkExpression('c.m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: false));
-  }
-
-  Future test_postDominators_continue() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(bool b1, C _c) {
-  while (b1/*check*/) {
-    bool b2 = b1;
-    C c = _c;
-    if (b2/*check*/) {
-      continue;
-    }
-    c.m();
-  }
-}
-''');
-
-    assertNullCheck(checkExpression('b1/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b1').node, never, hard: true));
-    assertNullCheck(checkExpression('b2/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b2').node, never, hard: true));
-    assertNullCheck(checkExpression('c.m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: false));
-  }
-
-  Future test_postDominators_doWhileStatement_conditional() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(bool b, C c) {
-  do {
-    return;
-  } while(b/*check*/);
-
-  c.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: false));
-    assertNullCheck(checkExpression('c.m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: false));
-  }
-
-  Future test_postDominators_doWhileStatement_unconditional() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(bool b, C c1, C c2) {
-  do {
-    C c3 = C();
-    c1.m();
-    c3.m();
-  } while(b/*check*/);
-
-  c2.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: true));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: true));
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: true));
-  }
-
-  Future test_postDominators_forElement() async {
-    await analyze('''
-class C {
-  int m() => 0;
-}
-
-void test(bool _b, C c1, C c2) {
-  [for (bool b1 = _b; b1/*check*/; c2.m()) c1.m()];
-}
-''');
-
-    assertNullCheck(checkExpression('b1/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b1').node, never, hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: false));
-  }
-
-  Future test_postDominators_forInElement() async {
-    await analyze('''
-class C {
-  int m() => 0;
-}
-void test(List l, C c1) {
-  [for (C _c in l/*check*/) c1.m()];
-  [for (C c2 in []) c2.m()];
-}
-''');
-
-    assertNullCheck(
-        checkExpression('l/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('List l').node, never,
-            hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: false));
-  }
-
-  Future test_postDominators_forInStatement_unconditional() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(List l, C c1, C c2) {
-  for (C c3 in l/*check*/) {
-    c1.m();
-    c3.m();
-  }
-
-  c2.m();
-}
-''');
-
-    assertNullCheck(
-        checkExpression('l/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('List l').node, never,
-            hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: true));
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: false));
-  }
-
-  Future test_postDominators_forStatement_conditional() async {
-    await analyze('''
-
-class C {
-  void m() {}
-}
-void test(bool b1, C c1, C c2, C c3) {
-  for (; b1/*check*/; c2.m()) {
-    C c4 = c1;
-    c4.m();
-    return;
-  }
-
-  c3.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b1/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b1').node, never, hard: true));
-    assertNullCheck(checkExpression('c4.m')!,
-        assertEdge(decoratedTypeAnnotation('C c4').node, never, hard: true));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: false));
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: false));
-  }
-
-  Future test_postDominators_forStatement_unconditional() async {
-    await analyze('''
-
-class C {
-  void m() {}
-}
-void test(bool b1, C c1, C c2, C c3) {
-  for (bool b2 = b1, b3 = b1; b1/*check*/ & b2/*check*/; c3.m()) {
-    c1.m();
-    assert(b3 != null);
-  }
-
-  c2.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b1/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b1').node, never, hard: true));
-    //TODO(mfairhurst): enable this check
-    //assertNullCheck(checkExpression('b2/*check*/'),
-    //    assertEdge(decoratedTypeAnnotation('bool b2').node, never, hard: true));
-    //assertEdge(decoratedTypeAnnotation('b3 =').node, never, hard: false);
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: true));
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: false));
-  }
-
-  Future test_postDominators_ifElement() async {
-    await analyze('''
-class C {
-  int m() => 0;
-}
-void test(bool b, C c1, C c2, C c3) {
-  [if (b) c1.m() else c2.m()];
-  c3.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b)')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: false));
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: true));
-  }
-
-  Future test_postDominators_ifStatement_conditional() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(bool b, C c1, C c2) {
-  if (b/*check*/) {
-    C c3 = C();
-    C c4 = C();
-    c1.m();
-    c3.m();
-
-    // Divergence breaks post-dominance.
-    return;
-    c4.m();
-
-  }
-  c2.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: false));
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: true));
-    assertNullCheck(checkExpression('c4.m')!,
-        assertEdge(decoratedTypeAnnotation('C c4').node, never, hard: false));
-  }
-
-  Future test_postDominators_ifStatement_unconditional() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(bool b, C c1, C c2) {
-  if (b/*check*/) {
-    C c3 = C();
-    C c4 = C();
-    c1.m();
-    c3.m();
-
-    // We ignore exceptions for post-dominance.
-    throw '';
-    c4.m();
-
-  }
-  c2.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: true));
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: true));
-    assertNullCheck(checkExpression('c4.m')!,
-        assertEdge(decoratedTypeAnnotation('C c4').node, never, hard: true));
-  }
-
-  Future test_postDominators_inReturn_local() async {
-    await analyze('''
-class C {
-  int m() => 0;
-}
-int test(C c) {
-  return c.m();
-}
-''');
-
-    assertNullCheck(checkExpression('c.m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_postDominators_loopReturn() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(bool b1, C _c) {
-  C c1 = _c;
-  while (b1/*check*/) {
-    bool b2 = b1;
-    C c2 = _c;
-    if (b2/*check*/) {
-      return;
-    }
-    c2.m();
-  }
-  c1.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b1/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b1').node, never, hard: true));
-    assertNullCheck(checkExpression('b2/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b2').node, never, hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: false));
-  }
-
-  Future test_postDominators_multiDeclaration() async {
-    // Multi declarations cannot use hard edges as shown below.
-    await analyze('''
-void test() {
-  int i1 = 0, i2 = null;
-  i1.toDouble();
-}
-''');
-
-    // i1.toDouble() cannot be a hard edge or i2 will fail assignment
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: false);
-    // i2 gets a soft edge to always due to null assignment
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int i').node,
-        hard: false);
-  }
-
-  Future test_postDominators_questionQuestionOperator() async {
-    await analyze('''
-class C {
-  Object m() => null;
-}
-Object test(C x, C y) => x.m() ?? y.m();
-''');
-    // There is a hard edge from x to `never` because `x.m()` is unconditionally
-    // reachable from the top of `test`.
-    assertEdge(decoratedTypeAnnotation('C x').node, never, hard: true);
-    // However, the edge from y to `never` is soft because `y.m()` is only
-    // executed if `x.m()` returned `null`.
-    assertEdge(decoratedTypeAnnotation('C y').node, never,
-        hard: false, guards: [decoratedTypeAnnotation('Object m').node]);
-  }
-
-  Future test_postDominators_reassign() async {
-    await analyze('''
-void test(bool b, int i1, int i2) {
-  i1 = null;
-  i1.toDouble();
-  if (b) {
-    i2 = null;
-  }
-  i2.toDouble();
-}
-''');
-
-    assertNullCheck(checkExpression('i1.toDouble')!,
-        assertEdge(decoratedTypeAnnotation('int i1').node, never, hard: false));
-
-    assertNullCheck(checkExpression('i2.toDouble')!,
-        assertEdge(decoratedTypeAnnotation('int i2').node, never, hard: false));
-  }
-
-  Future test_postDominators_shortCircuitOperators() async {
-    await analyze('''
-class C {
-  bool m() => true;
-}
-void test(C c1, C c2, C c3, C c4) {
-  c1.m() && c2.m();
-  c3.m() || c4.m();
-}
-''');
-
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: true));
-
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: true));
-
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: false));
-
-    assertNullCheck(checkExpression('c4.m')!,
-        assertEdge(decoratedTypeAnnotation('C c4').node, never, hard: false));
-  }
-
-  Future test_postDominators_subFunction() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test() {
-  (C c) {
-    c.m();
-  };
-}
-''');
-
-    assertNullCheck(checkExpression('c.m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  @failingTest
-  Future test_postDominators_subFunction_ifStatement_conditional() async {
-    // Failing because function expressions aren't implemented
-    await analyze('''
-class C {
-  void m() {}
-}
-void test() {
-  (bool b, C c) {
-    if (b/*check*/) {
-      return;
-    }
-    c.m();
-  };
-}
-''');
-
-    assertNullCheck(checkExpression('b/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: false));
-    assertNullCheck(checkExpression('c.m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: false));
-  }
-
-  Future
-      test_postDominators_subFunction_ifStatement_unconditional() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test() {
-  (bool b, C c) {
-    if (b/*check*/) {
-    }
-    c.m();
-  };
-}
-''');
-
-    assertNullCheck(checkExpression('b/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-    assertNullCheck(checkExpression('c.m')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_postDominators_subFunction_nested() async {
-    await analyze('''
-f1(int a, int b, int c, int d) {
-  f2() {
-    a = 0;
-    f3() {
-      b = 0;
-    }
-    c = 0;
-  }
-  a + 1;
-  b + 1;
-  c + 1;
-  d + 1;
-}
-''');
-    // a, b, and c may all be written to prior to their use, so their use sites
-    // don't demonstrate non-null intent.
-    assertEdge(decoratedTypeAnnotation('int a').node, never, hard: false);
-    assertEdge(decoratedTypeAnnotation('int b').node, never, hard: false);
-    assertEdge(decoratedTypeAnnotation('int c').node, never, hard: false);
-    // However, the use of `d` does demonstrate non-null intent because there's
-    // no write to `d`.
-    assertEdge(decoratedTypeAnnotation('int d').node, never, hard: true);
-  }
-
-  Future test_postDominators_subFunction_nested_closure() async {
-    await analyze('''
-f1(int a, int b, int c, int d) {
-  var f2 = () {
-    a = 0;
-    var f3 = () {
-      b = 0;
-    };
-    c = 0;
-  };
-  a + 1;
-  b + 1;
-  c + 1;
-  d + 1;
-}
-''');
-    // a, b, and c may all be written to prior to their use, so their use sites
-    // don't demonstrate non-null intent.
-    assertEdge(decoratedTypeAnnotation('int a').node, never, hard: false);
-    assertEdge(decoratedTypeAnnotation('int b').node, never, hard: false);
-    assertEdge(decoratedTypeAnnotation('int c').node, never, hard: false);
-    // However, the use of `d` does demonstrate non-null intent because there's
-    // no write to `d`.
-    assertEdge(decoratedTypeAnnotation('int d').node, never, hard: true);
-  }
-
-  Future test_postDominators_ternaryOperator() async {
-    await analyze('''
-class C {
-  bool m() => true;
-}
-void test(C c1, C c2, C c3, C c4) {
-  c1.m() ? c2.m() : c3.m();
-
-  c4.m();
-}
-''');
-
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: true));
-
-    assertNullCheck(checkExpression('c4.m')!,
-        assertEdge(decoratedTypeAnnotation('C c4').node, never, hard: true));
-
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: false));
-
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: false));
-  }
-
-  Future test_postDominators_tryCatch() async {
-    await analyze('''
-void test(int i) {
-  try {} catch (_) {
-    i.isEven;
-  }
-}
-''');
-    // Edge should not be hard because the call to `i.isEven` does not
-    // post-dominate the declaration of `i`.
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: false);
-  }
-
-  Future test_postDominators_whileStatement_unconditional() async {
-    await analyze('''
-class C {
-  void m() {}
-}
-void test(bool b, C c1, C c2) {
-  while (b/*check*/) {
-    C c3 = C();
-    c1.m();
-    c3.m();
-  }
-
-  c2.m();
-}
-''');
-
-    assertNullCheck(checkExpression('b/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('bool b').node, never, hard: true));
-    assertNullCheck(checkExpression('c1.m')!,
-        assertEdge(decoratedTypeAnnotation('C c1').node, never, hard: false));
-    assertNullCheck(checkExpression('c2.m')!,
-        assertEdge(decoratedTypeAnnotation('C c2').node, never, hard: true));
-    assertNullCheck(checkExpression('c3.m')!,
-        assertEdge(decoratedTypeAnnotation('C c3').node, never, hard: true));
-  }
-
-  Future test_postfixExpression_minusMinus() async {
-    await analyze('''
-int f(int i) {
-  return i--;
-}
-''');
-
-    var declaration = decoratedTypeAnnotation('int i').node;
-    var use = checkExpression('i--')!;
-    assertNullCheck(use, assertEdge(declaration, never, hard: true));
-
-    var returnType = decoratedTypeAnnotation('int f').node;
-    assertEdge(declaration, returnType, hard: false);
-  }
-
-  Future test_postfixExpression_plusPlus() async {
-    await analyze('''
-int f(int i) {
-  return i++;
-}
-''');
-
-    var declaration = decoratedTypeAnnotation('int i').node;
-    var use = checkExpression('i++')!;
-    assertNullCheck(use, assertEdge(declaration, never, hard: true));
-
-    var returnType = decoratedTypeAnnotation('int f').node;
-    assertEdge(declaration, returnType, hard: false);
-  }
-
-  Future test_postfixExpression_plusPlus_dynamic() async {
-    await analyze('''
-Object f(dynamic d) {
-  return d++;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('dynamic d').node,
-        decoratedTypeAnnotation('Object f').node,
-        hard: false);
-  }
-
-  Future test_postfixExpression_plusPlus_substituted() async {
-    await analyze('''
-abstract class C {
-  C operator+(int x);
-}
-C f(C c) {
-  return c++;
-}
-''');
-
-    var cType = decoratedTypeAnnotation('C c');
-    var returnType = decoratedTypeAnnotation('C f');
-    assertNullCheck(
-        checkExpression('c++')!, assertEdge(cType.node, never, hard: true));
-    assertEdge(cType.node, returnType.node, hard: false);
-    assertEdge(cType.typeArguments[0]!.node, returnType.typeArguments[0]!.node,
-        hard: false, checkable: false);
-  }
-
-  Future test_prefixedIdentifier_bangHint() async {
-    await analyze('''
-import 'dart:math' as m;
-double f1() => m.pi;
-double f2() => m.pi/*!*/;
-''');
-    expect(
-        assertEdge(anyNode, decoratedTypeAnnotation('double f1').node,
-                hard: false)
-            .sourceNode,
-        isNot(never));
-    expect(
-        assertEdge(anyNode, decoratedTypeAnnotation('double f2').node,
-                hard: false)
-            .sourceNode,
-        never);
-    expect(hasNullCheckHint(findNode.prefixed('m.pi/*!*/')), isTrue);
-  }
-
-  Future test_prefixedIdentifier_extension_nullTarget_get() async {
-    await analyze('''
-class C {}
-extension on C /*1*/ {
-  int get x => 0;
-}
-void f() {
-  C c = null;
-  c.x;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C c').node,
-        decoratedTypeAnnotation('C /*1*/').node,
-        hard: true);
-  }
-
-  Future test_prefixedIdentifier_extension_nullTarget_set() async {
-    await analyze('''
-class C {}
-extension on C /*1*/ {
-  set x(int value) {}
-}
-void f() {
-  C c = null;
-  c.x = 0;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C c').node,
-        decoratedTypeAnnotation('C /*1*/').node,
-        hard: true);
-  }
-
-  Future test_prefixedIdentifier_field_type() async {
-    await analyze('''
-class C {
-  bool b = true;
-}
-bool f(C c) => c.b;
-''');
-    assertEdge(decoratedTypeAnnotation('bool b').node,
-        decoratedTypeAnnotation('bool f').node,
-        hard: false);
-  }
-
-  Future test_prefixedIdentifier_getter_type() async {
-    await analyze('''
-class C {
-  bool get b => true;
-}
-bool f(C c) => c.b;
-''');
-    assertEdge(decoratedTypeAnnotation('bool get').node,
-        decoratedTypeAnnotation('bool f').node,
-        hard: false);
-  }
-
-  Future test_prefixedIdentifier_getter_type_in_generic() async {
-    await analyze('''
-class C {
-  List _x;
-  List get x => _x;
-}
-List f(C c) => c.x;
-''');
-    assertEdge(decoratedTypeAnnotation('List get').node,
-        decoratedTypeAnnotation('List f').node,
-        hard: false);
-    assertEdge(
-        substitutionNode(decoratedTypeAnnotation('int> c').node,
-            decoratedTypeAnnotation('T> get').node),
-        decoratedTypeAnnotation('int> f').node,
-        hard: false,
-        checkable: false);
-  }
-
-  Future test_prefixedIdentifier_target_check() async {
-    await analyze('''
-class C {
-  int get x => 1;
-}
-void test(C c) {
-  c.x;
-}
-''');
-
-    assertNullCheck(checkExpression('c.x')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future
-      test_prefixedIdentifier_target_demonstrates_non_null_intent() async {
-    await analyze('''
-class C {
-  int get x => 1;
-}
-void test(C c) {
-  c.x;
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true);
-  }
-
-  Future test_prefixedIdentifier_tearoff() async {
-    await analyze('''
-abstract class C {
-  int f(int i);
-}
-int Function(int) g(C c) => c.f;
-''');
-    var fType = variables.decoratedElementType(findElement.method('f'));
-    var gReturnType =
-        variables.decoratedElementType(findElement.function('g')).returnType!;
-    assertEdge(fType.returnType!.node, gReturnType.returnType!.node,
-        hard: false, checkable: false);
-    assertEdge(gReturnType.positionalParameters![0].node,
-        fType.positionalParameters![0].node,
-        hard: false, checkable: false);
-  }
-
-  Future test_prefixExpression_bang() async {
-    await analyze('''
-bool f(bool b) {
-  return !b;
-}
-''');
-
-    var nullable_b = decoratedTypeAnnotation('bool b').node;
-    var check_b = checkExpression('b;')!;
-    assertNullCheck(check_b, assertEdge(nullable_b, never, hard: true));
-
-    var return_f = decoratedTypeAnnotation('bool f').node;
-    assertEdge(inSet(pointsToNever), return_f, hard: false);
-  }
-
-  Future test_prefixExpression_bang_dynamic() async {
-    await analyze('''
-Object f(dynamic d) {
-  return !d;
-}
-''');
-    var return_f = decoratedTypeAnnotation('Object f').node;
-    assertEdge(inSet(pointsToNever), return_f, hard: false);
-  }
-
-  Future test_prefixExpression_minus() async {
-    await analyze('''
-abstract class C {
-  C operator-();
-}
-C test(C c) => -c/*check*/;
-''');
-    assertEdge(decoratedTypeAnnotation('C operator').node,
-        decoratedTypeAnnotation('C test').node,
-        hard: false);
-    assertNullCheck(checkExpression('c/*check*/')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_prefixExpression_minus_dynamic() async {
-    await analyze('''
-Object test(dynamic d) => -d;
-''');
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('Object test').node,
-        hard: false);
-    assertEdge(decoratedTypeAnnotation('dynamic d').node, never, hard: true);
-  }
-
-  Future test_prefixExpression_minus_substituted() async {
-    await analyze('''
-abstract class C {
-  List operator-();
-}
-List test(C c) => -c/*check*/;
-''');
-    var operatorReturnType = decoratedTypeAnnotation('List operator');
-    var cType = decoratedTypeAnnotation('C c');
-    var testReturnType = decoratedTypeAnnotation('List test');
-    assertEdge(operatorReturnType.node, testReturnType.node, hard: false);
-    assertNullCheck(checkExpression('c/*check*/')!,
-        assertEdge(cType.node, never, hard: true));
-    assertEdge(
-        substitutionNode(cType.typeArguments[0]!.node,
-            operatorReturnType.typeArguments[0]!.node),
-        testReturnType.typeArguments[0]!.node,
-        hard: false,
-        checkable: false);
-  }
-
-  Future test_prefixExpression_minusMinus() async {
-    await analyze('''
-int f(int i) {
-  return --i;
-}
-''');
-
-    var declaration = decoratedTypeAnnotation('int i').node;
-    var use = checkExpression('i;')!;
-    assertNullCheck(use, assertEdge(declaration, never, hard: true));
-
-    var returnType = decoratedTypeAnnotation('int f').node;
-    assertEdge(inSet(pointsToNever), returnType, hard: false);
-  }
-
-  Future test_prefixExpression_plusPlus() async {
-    await analyze('''
-int f(int i) {
-  return ++i;
-}
-''');
-
-    var declaration = decoratedTypeAnnotation('int i').node;
-    var use = checkExpression('i;')!;
-    assertNullCheck(use, assertEdge(declaration, never, hard: true));
-
-    var returnType = decoratedTypeAnnotation('int f').node;
-    assertEdge(inSet(pointsToNever), returnType, hard: false);
-  }
-
-  Future test_prefixExpression_plusPlus_dynamic() async {
-    await analyze('''
-Object f(dynamic d) {
-  return ++d;
-}
-''');
-    var returnType = decoratedTypeAnnotation('Object f').node;
-    assertEdge(inSet(alwaysPlus), returnType, hard: false);
-  }
-
-  Future test_prefixExpression_plusPlus_substituted() async {
-    await analyze('''
-abstract class C {
-  C operator+(int i);
-}
-C f(C x) => ++x;
-    ''');
-    var xType = decoratedTypeAnnotation('C x');
-    var plusReturnType = decoratedTypeAnnotation('C operator');
-    var fReturnType = decoratedTypeAnnotation('C f');
-    assertEdge(xType.node, never, hard: true);
-    assertEdge(plusReturnType.node, fReturnType.node, hard: false);
-    assertEdge(
-        substitutionNode(xType.typeArguments[0]!.node,
-            plusReturnType.typeArguments[0]!.node),
-        fReturnType.typeArguments[0]!.node,
-        hard: false,
-        checkable: false);
-  }
-
-  Future test_property_generic_onResultOfImplicitSuper() async {
-    await analyze('''
-class Base {
-  Base x;
-}
-
-class Sub extends Base {
-  void implicitSuper() => x.x;
-}
-''');
-    // Don't bother checking any edges; the assertions in the DecoratedType
-    // constructor verify that we've substituted the bound correctly.
-  }
-
-  Future test_property_implicitSuper_assignment() async {
-    await analyze('''
-class Base {
-  T1 x;
-}
-
-class Sub extends Base {
-  void g() => x = null;
-}
-''');
-    assertEdge(
-        inSet(alwaysPlus),
-        substitutionNode(
-          substitutionNode(
-            anyNode, // non-null for `this`.
-            decoratedTypeAnnotation('T2> {').node,
-          ),
-          decoratedTypeAnnotation('T1 x').node,
-        ),
-        hard: false);
-  }
-
-  Future test_propertyAccess_bangHint() async {
-    await analyze('''
-abstract class C {
-  int get i1;
-  int get i2;
-}
-int f1(C c) => (c).i1;
-int f2(C c) => (c).i2/*!*/;
-''');
-    assertEdge(decoratedTypeAnnotation('int get i1').node,
-        decoratedTypeAnnotation('int f1').node,
-        hard: false);
-    assertNoEdge(decoratedTypeAnnotation('int get i2').node,
-        decoratedTypeAnnotation('int f2').node);
-    expect(hasNullCheckHint(findNode.propertyAccess('(c).i2')), isTrue);
-  }
-
-  Future test_propertyAccess_call_functionTyped() async {
-    await analyze('''
-String/*1*/ Function(int/*2*/) f(String/*3*/ Function(int/*4*/) callback)
-    => callback.call;
-''');
-    assertEdge(decoratedTypeAnnotation('String/*3*/').node,
-        decoratedTypeAnnotation('String/*1*/').node,
-        hard: false, checkable: false);
-    assertEdge(decoratedTypeAnnotation('int/*2*/').node,
-        decoratedTypeAnnotation('int/*4*/').node,
-        hard: false, checkable: false);
-    var tearOffNodeMatcher = anyNode;
-    assertEdge(
-        tearOffNodeMatcher,
-        decoratedGenericFunctionTypeAnnotation('String/*1*/ Function(int/*2*/)')
-            .node,
-        hard: false);
-    assertEdge(never, tearOffNodeMatcher.matchingNode,
-        hard: true, checkable: false);
-  }
-
-  Future test_propertyAccess_call_interfaceTyped() async {
-    // Make sure that we don't try to treat all methods called `call` as though
-    // the underlying type is a function type.
-    await analyze('''
-abstract class C {
-  String call(int x);
-}
-String Function(int) f(C c) => c.call;
-''');
-    assertEdge(decoratedTypeAnnotation('String call').node,
-        decoratedTypeAnnotation('String Function').node,
-        hard: false, checkable: false);
-    assertEdge(decoratedTypeAnnotation('int) f').node,
-        decoratedTypeAnnotation('int x').node,
-        hard: false, checkable: false);
-    assertEdge(never,
-        decoratedGenericFunctionTypeAnnotation('String Function(int)').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_dynamic() async {
-    await analyze('''
-class C {
-  int get g => 0;
-}
-int f(dynamic d) {
-  return d.g;
-}
-''');
-    // The call `d.g` is dynamic, so we can't tell what method it resolves
-    // to.  There's no reason to assume it resolves to `C.g`.
-    assertNoEdge(decoratedTypeAnnotation('int get g').node,
-        decoratedTypeAnnotation('int f').node);
-    // We do, however, assume that it might return anything, including `null`.
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_extension_nullTarget_get() async {
-    await analyze('''
-class C {}
-extension on C /*1*/ {
-  int get x => 0;
-}
-void f() {
-  C g() => null;
-  g().x;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C g()').node,
-        decoratedTypeAnnotation('C /*1*/').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_extension_nullTarget_get_explicit() async {
-    await analyze('''
-class C {}
-extension E on C /*1*/ {
-  int get x => 0;
-}
-void f() {
-  C g() => null;
-  E(g()).x;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C g()').node,
-        decoratedTypeAnnotation('C /*1*/').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_extension_nullTarget_set() async {
-    await analyze('''
-class C {}
-extension on C /*1*/ {
-  set x(int value) {}
-}
-void f() {
-  C g() => null;
-  g().x = 0;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C g()').node,
-        decoratedTypeAnnotation('C /*1*/').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_extension_nullTarget_set_explicit() async {
-    await analyze('''
-class C {}
-extension E on C /*1*/ {
-  set x(int value) {}
-}
-void f() {
-  C g() => null;
-  E(g()).x = 0;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('C g()').node,
-        decoratedTypeAnnotation('C /*1*/').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_object_property() async {
-    await analyze('''
-int f(int i) => i.hashCode;
-''');
-    // No edge from i to `never` because it is safe to call `hashCode` on
-    // `null`.
-    assertNoEdge(decoratedTypeAnnotation('int i').node, never);
-  }
-
-  Future test_propertyAccess_object_property_on_function_type() async {
-    await analyze('int f(void Function() g) => g.hashCode;');
-    var hashCodeReturnType = variables
-        .decoratedElementType(
-            typeProvider.objectType.element.getGetter('hashCode')!)
-        .returnType!;
-    assertEdge(hashCodeReturnType.node, decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_return_type() async {
-    await analyze('''
-class C {
-  bool get b => true;
-}
-bool f(C c) => (c).b;
-''');
-    assertEdge(decoratedTypeAnnotation('bool get').node,
-        decoratedTypeAnnotation('bool f').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_return_type_null_aware() async {
-    await analyze('''
-class C {
-  bool get b => true;
-}
-bool f(C c) => (c?.b);
-''');
-    var lubNode =
-        decoratedExpressionType('(c?.b)')!.node as NullabilityNodeForLUB;
-    expect(lubNode.left, same(decoratedTypeAnnotation('C c').node));
-    expect(lubNode.right, same(decoratedTypeAnnotation('bool get b').node));
-    assertEdge(lubNode, decoratedTypeAnnotation('bool f').node, hard: false);
-  }
-
-  Future test_propertyAccess_static_on_generic_class() async {
-    await analyze('''
-class C {
-  static int x = 1;
-}
-int f() => C.x;
-''');
-    assertEdge(decoratedTypeAnnotation('int x').node,
-        decoratedTypeAnnotation('int f').node,
-        hard: false);
-  }
-
-  Future test_propertyAccess_target_check() async {
-    await analyze('''
-class C {
-  int get x => 1;
-}
-void test(C c) {
-  (c).x;
-}
-''');
-
-    assertNullCheck(checkExpression('c).x')!,
-        assertEdge(decoratedTypeAnnotation('C c').node, never, hard: true));
-  }
-
-  Future test_quiver_checkNotNull_not_postDominating() async {
-    addQuiverPackage();
-    await analyze('''
-import 'package:quiver/check.dart';
-void f(bool b, int i, int j) {
-  checkNotNull(j);
-  if (b) return;
-  checkNotNull(i);
-}
-''');
-
-    // Asserts after ifs don't demonstrate non-null intent.
-    assertNoEdge(decoratedTypeAnnotation('int i').node, never);
-    // But asserts before ifs do
-    assertEdge(decoratedTypeAnnotation('int j').node, never, hard: true);
-  }
-
-  Future test_quiver_checkNotNull_postDominating() async {
-    addQuiverPackage();
-    await analyze('''
-import 'package:quiver/check.dart';
-void f(int i) {
-  checkNotNull(i);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-  }
-
-  Future test_quiver_checkNotNull_prefixed() async {
-    addQuiverPackage();
-    await analyze('''
-import 'package:quiver/check.dart' as quiver;
-void f(int i) {
-  quiver.checkNotNull(i);
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int i').node, never, hard: true);
-  }
-
-  Future test_redirecting_constructor_factory() async {
-    await analyze('''
-class C {
-  factory C(int/*1*/ i, {int/*2*/ j}) = D;
-}
-class D implements C {
-  D(int/*3*/ i, {int/*4*/ j});
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int/*1*/').node,
-        decoratedTypeAnnotation('int/*3*/').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int/*2*/').node,
-        decoratedTypeAnnotation('int/*4*/').node,
-        hard: true);
-  }
-
-  Future
-      test_redirecting_constructor_factory_from_generic_to_generic() async {
-    await analyze('''
-class C {
-  factory C(T/*1*/ t) = D;
-}
-class D implements C {
-  D(U/*3*/ u);
-}
-''');
-    var nullable_t1 = decoratedTypeAnnotation('T/*1*/').node;
-    var nullable_t2 = decoratedTypeAnnotation('T/*2*/').node;
-    var nullable_u3 = decoratedTypeAnnotation('U/*3*/').node;
-    assertEdge(nullable_t1, substitutionNode(nullable_t2, nullable_u3),
-        hard: true);
-  }
-
-  Future test_redirecting_constructor_factory_to_generic() async {
-    await analyze('''
-class C {
-  factory C(int/*1*/ i) = D;
-}
-class D implements C {
-  D(T/*3*/ i);
-}
-''');
-    var nullable_i1 = decoratedTypeAnnotation('int/*1*/').node;
-    var nullable_i2 = decoratedTypeAnnotation('int/*2*/').node;
-    var nullable_t3 = decoratedTypeAnnotation('T/*3*/').node;
-    assertEdge(nullable_i1, substitutionNode(nullable_i2, nullable_t3),
-        hard: true);
-  }
-
-  Future test_redirecting_constructor_ordinary() async {
-    await analyze('''
-class C {
-  C(int/*1*/ i, int/*2*/ j) : this.named(j, i);
-  C.named(int/*3*/ j, int/*4*/ i);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int/*1*/').node,
-        decoratedTypeAnnotation('int/*4*/').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int/*2*/').node,
-        decoratedTypeAnnotation('int/*3*/').node,
-        hard: true);
-  }
-
-  Future test_redirecting_constructor_ordinary_to_unnamed() async {
-    await analyze('''
-class C {
-  C.named(int/*1*/ i, int/*2*/ j) : this(j, i);
-  C(int/*3*/ j, int/*4*/ i);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int/*1*/').node,
-        decoratedTypeAnnotation('int/*4*/').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int/*2*/').node,
-        decoratedTypeAnnotation('int/*3*/').node,
-        hard: true);
-  }
-
-  Future test_return_from_async_bottom() async {
-    await analyze('''
-Future f() async => throw '';
-''');
-    assertNoEdge(always, decoratedTypeAnnotation('Future').node);
-    assertNoEdge(always, decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_return_from_async_closureBody_future() async {
-    await analyze('''
-Future f() {
-  return () async {
-    return g();
-  }();
-}
-int g() => 1;
-''');
-    assertEdge(
-        decoratedTypeAnnotation('int g').node,
-        // TODO(40621): This should be a checkable edge.
-        assertEdge(anyNode, decoratedTypeAnnotation('int>').node,
-                hard: false, checkable: false)
-            .sourceNode,
-        hard: false,
-        // TODO(40621): This should be a checkable edge.
-        checkable: false);
-  }
-
-  Future test_return_from_async_closureExpression_future() async {
-    await analyze('''
-Future Function() f() {
-  return () async => g();
-}
-int g() => 1;
-''');
-    assertEdge(
-        decoratedTypeAnnotation('int g').node,
-        // TODO(40621): This should be a checkable edge.
-        assertEdge(anyNode, decoratedTypeAnnotation('int>').node,
-                hard: true, checkable: false)
-            .sourceNode,
-        hard: false,
-        // TODO(40621): This should be a checkable edge.
-        checkable: false);
-  }
-
-  Future test_return_from_async_expressionBody_future() async {
-    await analyze('''
-Future f() async => g();
-int g() => 1;
-''');
-    // TODO(40621): This should be a checkable edge.
-    assertEdge(decoratedTypeAnnotation('int g').node,
-        decoratedTypeAnnotation('int>').node,
-        hard: false, checkable: false);
-  }
-
-  Future test_return_from_async_future() async {
-    await analyze('''
-Future f() async {
-  return g();
-}
-int g() => 1;
-''');
-    // TODO(40621): This should be a checkable edge.
-    assertEdge(decoratedTypeAnnotation('int g').node,
-        decoratedTypeAnnotation('int>').node,
-        hard: false, checkable: false);
-  }
-
-  Future test_return_from_async_future_void() async {
-    await analyze('''
-Future f() async {
-  return;
-}
-int g() => 1;
-''');
-    assertNoEdge(always, decoratedTypeAnnotation('Future').node);
-  }
-
-  Future test_return_from_async_futureOr() async {
-    await analyze('''
-import 'dart:async';
-FutureOr f() async {
-  return g();
-}
-int g() => 1;
-''');
-    // No assertions; just checking that it doesn't crash.
-  }
-
-  Future test_return_from_async_futureOr_to_future() async {
-    await analyze('''
-import 'dart:async';
-Future f(FutureOr x) async => x;
-''');
-    var lubNodeMatcher = anyNode;
-    assertEdge(lubNodeMatcher, decoratedTypeAnnotation('Object').node,
-        hard: true, checkable: false);
-    var lubNode = lubNodeMatcher.matchingNode as NullabilityNodeForLUB;
-    expect(lubNode.left, same(decoratedTypeAnnotation('int> x').node));
-    expect(lubNode.right, same(decoratedTypeAnnotation('FutureOr').node));
-  }
-
-  Future test_return_from_async_list_to_future() async {
-    await analyze('''
-import 'dart:async';
-Future f(List x) async => x;
-''');
-    assertEdge(decoratedTypeAnnotation('List').node,
-        decoratedTypeAnnotation('Object').node,
-        hard: true, checkable: false);
-  }
-
-  Future test_return_from_async_null() async {
-    await analyze('''
-Future f() async {
-  return null;
-}
-''');
-    // TODO(40621): This should be a checkable edge.
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int>').node,
-        hard: false, checkable: false);
-  }
-
-  Future test_return_function_type_simple() async {
-    await analyze('''
-int/*1*/ Function() f(int/*2*/ Function() x) => x;
-''');
-    var int1 = decoratedTypeAnnotation('int/*1*/');
-    var int2 = decoratedTypeAnnotation('int/*2*/');
-    assertEdge(int2.node, int1.node, hard: false, checkable: false);
-  }
-
-  Future test_return_implicit_null() async {
-    verifyNoTestUnitErrors = false;
-    await analyze('''
-int f() {
-  return;
-}
-''');
-
-    var edge = assertEdge(
-        inSet(alwaysPlus), decoratedTypeAnnotation('int').node,
-        hard: false);
-    expect(
-        edge.sourceNode!.displayName, 'implicit null return (test.dart:2:3)');
-  }
-
-  Future test_return_in_asyncStar() async {
-    await analyze('''
-Stream f() async* {
-  yield 1;
-  return;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Stream').node);
-  }
-
-  Future test_return_in_syncStar() async {
-    await analyze('''
-Iterable f() sync* {
-  yield 1;
-  return;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Iterable').node);
-  }
-
-  Future test_return_null() async {
-    await analyze('''
-int f() {
-  return null;
-}
-''');
-
-    var edge = assertEdge(
-        inSet(alwaysPlus), decoratedTypeAnnotation('int').node,
-        hard: false);
-    assertNullCheck(checkExpression('null')!, edge);
-    expect(edge.sourceNode!.displayName, 'null literal (test.dart:2:10)');
-  }
-
-  Future test_return_null_generic() async {
-    await analyze('''
-class C {
-  T f() {
-    return null;
-  }
-}
-''');
-    var tNode = decoratedTypeAnnotation('T f').node;
-    assertEdge(inSet(alwaysPlus), tNode, hard: false);
-    assertNullCheck(checkExpression('null')!,
-        assertEdge(inSet(alwaysPlus), tNode, hard: false));
-  }
-
-  Future
-      test_setOrMapLiteral_map_noTypeArgument_noNullableKeysAndValues() async {
-    await analyze('''
-Map f() {
-  return {'a' : 1, 'b' : 2};
-}
-''');
-    var keyNode = decoratedTypeAnnotation('String').node;
-    var valueNode = decoratedTypeAnnotation('int').node;
-    var mapNode = decoratedTypeAnnotation('Map').node;
-
-    assertNoUpstreamNullability(mapNode);
-    var keyEdge = assertEdge(anyNode, keyNode, hard: true, checkable: false);
-    assertNoUpstreamNullability(keyEdge.sourceNode);
-    expect(keyEdge.sourceNode!.displayName, 'map key type (test.dart:2:10)');
-    var valueEdge =
-        assertEdge(anyNode, valueNode, hard: true, checkable: false);
-    assertNoUpstreamNullability(valueEdge.sourceNode);
-    expect(
-        valueEdge.sourceNode!.displayName, 'map value type (test.dart:2:10)');
-  }
-
-  Future test_setOrMapLiteral_map_noTypeArgument_nullableKey() async {
-    await analyze('''
-Map f() {
-  return {'a' : 1, null : 2, 'c' : 3};
-}
-''');
-    var keyNode = decoratedTypeAnnotation('String').node;
-    var valueNode = decoratedTypeAnnotation('int').node;
-    var mapNode = decoratedTypeAnnotation('Map').node;
-
-    assertNoUpstreamNullability(mapNode);
-    assertEdge(inSet(alwaysPlus),
-        assertEdge(anyNode, keyNode, hard: true, checkable: false).sourceNode,
-        hard: false);
-    assertNoUpstreamNullability(
-        assertEdge(anyNode, valueNode, hard: true, checkable: false)
-            .sourceNode);
-  }
-
-  Future
-      test_setOrMapLiteral_map_noTypeArgument_nullableKeyAndValue() async {
-    await analyze('''
-Map f() {
-  return {'a' : 1, null : null, 'c' : 3};
-}
-''');
-    var keyNode = decoratedTypeAnnotation('String').node;
-    var valueNode = decoratedTypeAnnotation('int').node;
-    var mapNode = decoratedTypeAnnotation('Map').node;
-
-    assertNoUpstreamNullability(mapNode);
-    assertEdge(inSet(alwaysPlus),
-        assertEdge(anyNode, keyNode, hard: true, checkable: false).sourceNode,
-        hard: false);
-    assertEdge(inSet(alwaysPlus),
-        assertEdge(anyNode, valueNode, hard: true, checkable: false).sourceNode,
-        hard: false);
-  }
-
-  Future test_setOrMapLiteral_map_noTypeArgument_nullableValue() async {
-    await analyze('''
-Map f() {
-  return {'a' : 1, 'b' : null, 'c' : 3};
-}
-''');
-    var keyNode = decoratedTypeAnnotation('String').node;
-    var valueNode = decoratedTypeAnnotation('int').node;
-    var mapNode = decoratedTypeAnnotation('Map').node;
-
-    assertNoUpstreamNullability(mapNode);
-    assertNoUpstreamNullability(
-        assertEdge(anyNode, keyNode, hard: true, checkable: false).sourceNode);
-    assertEdge(inSet(alwaysPlus),
-        assertEdge(anyNode, valueNode, hard: true, checkable: false).sourceNode,
-        hard: false);
-  }
-
-  Future
-      test_setOrMapLiteral_map_typeArguments_noNullableKeysAndValues() async {
-    await analyze('''
-Map f() {
-  return {'a' : 1, 'b' : 2};
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Map').node);
-
-    var keyForLiteral = decoratedTypeAnnotation('String, int>{').node;
-    var keyForReturnType = decoratedTypeAnnotation('String, int> ').node;
-    assertNoUpstreamNullability(keyForLiteral);
-    assertEdge(keyForLiteral, keyForReturnType, hard: true, checkable: false);
-
-    var valueForLiteral = decoratedTypeAnnotation('int>{').node;
-    var valueForReturnType = decoratedTypeAnnotation('int> ').node;
-    assertNoUpstreamNullability(valueForLiteral);
-    assertEdge(valueForLiteral, valueForReturnType,
-        hard: true, checkable: false);
-  }
-
-  Future test_setOrMapLiteral_map_typeArguments_nullableKey() async {
-    await analyze('''
-Map f() {
-  return {'a' : 1, null : 2, 'c' : 3};
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Map').node);
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('String, int>{').node,
-        hard: false);
-    assertNoUpstreamNullability(decoratedTypeAnnotation('int>{').node);
-  }
-
-  Future
-      test_setOrMapLiteral_map_typeArguments_nullableKeyAndValue() async {
-    await analyze('''
-Map f() {
-  return {'a' : 1, null : null, 'c' : 3};
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Map').node);
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('String, int>{').node,
-        hard: false);
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int>{').node,
-        hard: false);
-  }
-
-  Future test_setOrMapLiteral_map_typeArguments_nullableValue() async {
-    await analyze('''
-Map f() {
-  return {'a' : 1, 'b' : null, 'c' : 3};
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Map').node);
-    assertNoUpstreamNullability(decoratedTypeAnnotation('String, int>{').node);
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int>{').node,
-        hard: false);
-  }
-
-  Future
-      test_setOrMapLiteral_set_noTypeArgument_noNullableElements() async {
-    await analyze('''
-Set f() {
-  return {'a', 'b'};
-}
-''');
-    var valueNode = decoratedTypeAnnotation('String').node;
-    var setNode = decoratedTypeAnnotation('Set').node;
-
-    assertNoUpstreamNullability(setNode);
-    var edge = assertEdge(anyNode, valueNode, hard: true, checkable: false);
-    assertNoUpstreamNullability(edge.sourceNode);
-    expect(edge.sourceNode!.displayName, 'set element type (test.dart:2:10)');
-  }
-
-  Future test_setOrMapLiteral_set_noTypeArgument_nullableElement() async {
-    await analyze('''
-Set f() {
-  return {'a', null, 'c'};
-}
-''');
-    var valueNode = decoratedTypeAnnotation('String').node;
-    var setNode = decoratedTypeAnnotation('Set').node;
-
-    assertNoUpstreamNullability(setNode);
-    assertEdge(inSet(alwaysPlus),
-        assertEdge(anyNode, valueNode, hard: true, checkable: false).sourceNode,
-        hard: false);
-  }
-
-  Future
-      test_setOrMapLiteral_set_typeArgument_noNullableElements() async {
-    await analyze('''
-Set f() {
-  return {'a', 'b'};
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Set').node);
-    var typeArgForLiteral = decoratedTypeAnnotation('String>{').node;
-    var typeArgForReturnType = decoratedTypeAnnotation('String> ').node;
-    assertNoUpstreamNullability(typeArgForLiteral);
-    assertEdge(typeArgForLiteral, typeArgForReturnType,
-        hard: true, checkable: false);
-  }
-
-  Future test_setOrMapLiteral_set_typeArgument_nullableElement() async {
-    await analyze('''
-Set f() {
-  return {'a', null, 'c'};
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Set').node);
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('String>{').node,
-        hard: false);
-  }
-
-  Future test_setter_overrides_implicit_setter() async {
-    await analyze('''
-class A {
-  String/*1*/ s = "x";
-}
-class C implements A {
-  String get s => "x";
-  void set s(String/*2*/ value) {}
-}
-f() => A().s = null;
-''');
-    var string1 = decoratedTypeAnnotation('String/*1*/');
-    var string2 = decoratedTypeAnnotation('String/*2*/');
-    assertEdge(string1.node, string2.node, hard: true);
-  }
-
-  Future test_setupAssignment_assignment_inDistantSetUp() async {
-    addTestCorePackage();
-    await analyze('''
-import 'package:test/test.dart';
-void main() {
-  int i;
-  // There could be tests here in which [i] is not certain to have been
-  // assigned.
-
-  group('g2', () {
-    setUp(() {
-      i = 1;
-    });
-  });
-}
-''');
-
-    assertNoEdge(graph.never, decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_setupAssignment_assignment_inSetUp() async {
-    addTestCorePackage();
-    await analyze('''
-import 'package:test/test.dart';
-void main() {
-  int i;
-    int j = 1;
-  setUp(() {
-    i = j;
-  });
-}
-''');
-
-    assertNullCheck(
-        checkExpression('j;')!,
-        assertEdge(decoratedTypeAnnotation('int j').node,
-            decoratedTypeAnnotation('int i').node,
-            hard: false, isSetupAssignment: true));
-  }
-
-  Future test_setupAssignment_assignment_inUnrelatedSetUp() async {
-    addTestCorePackage();
-    await analyze('''
-import 'package:test/test.dart';
-void main() {
-  group('g1', () {
-    int/*1*/ i;
-  });
-
-  group('g2', () {
-    int/*2*/ i;
-    int j = 1;
-    setUp(() {
-      i = j;
-    });
-  });
-}
-''');
-
-    assertNoEdge(graph.never, decoratedTypeAnnotation('int/*1*/').node);
-    assertNullCheck(
-        checkExpression('j;')!,
-        assertEdge(decoratedTypeAnnotation('int j').node,
-            decoratedTypeAnnotation('int/*2*/').node,
-            hard: false, isSetupAssignment: true));
-  }
-
-  Future test_setupAssignment_assignment_inWrongSetUp() async {
-    addTestCorePackage();
-    await analyze('''
-import 'package:test/test.dart' as t;
-void main() {
-  int i;
-  setUp(() {
-    i = 1;
-  });
-}
-void setUp(dynamic callback()) {}
-''');
-
-    assertNoEdge(graph.never, decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_setupAssignment_assignment_outsideSetUp() async {
-    addTestCorePackage();
-    await analyze('''
-import 'package:test/test.dart';
-void main() {
-  int i;
-  i = 1;
-}
-''');
-
-    assertNoEdge(graph.never, decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_setupAssignment_assignment_toField() async {
-    addTestCorePackage();
-    await analyze('''
-import 'package:test/test.dart';
-void main() {
-  setUp(() {
-    C c = C();
-    c.i = 1;
-  });
-}
-class C {
-  int i;
-}
-''');
-
-    assertNoEdge(graph.never, decoratedTypeAnnotation('int').node);
-  }
-
-  Future test_setupAssignment_nullAwareAssignment_inSetUp() async {
-    addTestCorePackage();
-    await analyze('''
-import 'package:test/test.dart';
-void main() {
-  int i;
-    int j = 1;
-  setUp(() {
-    i ??= j;
-  });
-}
-''');
-
-    var iNullable = decoratedTypeAnnotation('int i').node;
-    assertNullCheck(
-        checkExpression('j;')!,
-        assertEdge(decoratedTypeAnnotation('int j').node, iNullable,
-            hard: false, guards: [iNullable], isSetupAssignment: true));
-  }
-
-  Future test_simpleIdentifier_bangHint() async {
-    await analyze('''
-int f1(int i1) => i1;
-int f2(int i2) => i2/*!*/;
-''');
-    assertEdge(decoratedTypeAnnotation('int i1').node,
-        decoratedTypeAnnotation('int f1').node,
-        hard: true);
-    assertNoEdge(decoratedTypeAnnotation('int i2').node,
-        decoratedTypeAnnotation('int f2').node);
-    expect(hasNullCheckHint(findNode.simple('i2/*!*/')), isTrue);
-  }
-
-  Future test_simpleIdentifier_function() async {
-    await analyze('''
-int f() => null;
-main() {
-  int Function() g = f;
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int f').node,
-        decoratedTypeAnnotation('int Function').node,
-        hard: false, checkable: false);
-  }
-
-  Future test_simpleIdentifier_local() async {
-    await analyze('''
-main() {
-  int i = 0;
-  int j = i;
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int j').node,
-        hard: true);
-  }
-
-  Future test_simpleIdentifier_tearoff_function() async {
-    await analyze('''
-int f(int i) => 0;
-int Function(int) g() => f;
-''');
-    var fType = variables.decoratedElementType(findElement.function('f'));
-    var gReturnType =
-        variables.decoratedElementType(findElement.function('g')).returnType!;
-    assertEdge(fType.returnType!.node, gReturnType.returnType!.node,
-        hard: false, checkable: false);
-    assertEdge(gReturnType.positionalParameters![0].node,
-        fType.positionalParameters![0].node,
-        hard: false, checkable: false);
-  }
-
-  Future test_simpleIdentifier_tearoff_method() async {
-    await analyze('''
-abstract class C {
-  int f(int i);
-  int Function(int) g() => f;
-}
-''');
-    var fType = variables.decoratedElementType(findElement.method('f'));
-    var gReturnType =
-        variables.decoratedElementType(findElement.method('g')).returnType!;
-    assertEdge(fType.returnType!.node, gReturnType.returnType!.node,
-        hard: false, checkable: false);
-    assertEdge(gReturnType.positionalParameters![0].node,
-        fType.positionalParameters![0].node,
-        hard: false, checkable: false);
-  }
-
-  Future test_skipDirectives() async {
-    await analyze('''
-import "dart:core" as one;
-main() {}
-''');
-    // No test expectations.
-    // Just verifying that the test passes
-  }
-
-  Future test_soft_edge_for_non_variable_reference() async {
-    // Edges originating in things other than variable references should be
-    // soft.
-    await analyze('''
-int f() => null;
-''');
-    assertEdge(inSet(alwaysPlus), decoratedTypeAnnotation('int').node,
-        hard: false);
-  }
-
-  Future test_spread_element_list() async {
-    await analyze('''
-void f(List ints) {
-  [...ints];
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('List').node, never, hard: true);
-    assertEdge(
-        substitutionNode(decoratedTypeAnnotation('int> ints').node, anyNode),
-        decoratedTypeAnnotation('int>[').node,
-        hard: true,
-        checkable: false);
-  }
-
-  Future test_spread_element_list_dynamic() async {
-    await analyze('''
-void f(dynamic ints) {
-  [...ints];
-}
-''');
-
-    // Mostly just check this doesn't crash.
-    assertEdge(decoratedTypeAnnotation('dynamic').node, never, hard: true);
-  }
-
-  Future test_spread_element_list_nullable() async {
-    await analyze('''
-void f(List ints) {
-  [...?ints];
-}
-''');
-
-    assertNoEdge(decoratedTypeAnnotation('List').node, never);
-    assertEdge(
-        substitutionNode(decoratedTypeAnnotation('int> ints').node, anyNode),
-        decoratedTypeAnnotation('int>[').node,
-        hard: true,
-        checkable: false);
-  }
-
-  Future test_spread_element_map() async {
-    await analyze('''
-void f(Map map) {
-  {...map};
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('Map').node, never,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('String, int> map').node,
-        decoratedTypeAnnotation('String, int>{').node,
-        hard: true, checkable: false);
-    assertEdge(decoratedTypeAnnotation('int> map').node,
-        decoratedTypeAnnotation('int>{').node,
-        hard: true, checkable: false);
-  }
-
-  Future test_spread_element_set() async {
-    await analyze('''
-void f(Set ints) {
-  {...ints};
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('Set').node, never, hard: true);
-    assertEdge(
-        substitutionNode(decoratedTypeAnnotation('int> ints').node, anyNode),
-        decoratedTypeAnnotation('int>{').node,
-        hard: true,
-        checkable: false);
-  }
-
-  Future test_spread_element_subtype() async {
-    await analyze('''
-abstract class C implements Iterable {}
-void f(C ints) {
-  [...ints];
-}
-''');
-
-    assertEdge(decoratedTypeAnnotation('C').node, never,
-        hard: true);
-    assertEdge(
-        substitutionNode(decoratedTypeAnnotation('int> ints').node,
-            decoratedTypeAnnotation('R> {}').node),
-        decoratedTypeAnnotation('int>[').node,
-        hard: true,
-        checkable: false);
-  }
-
-  Future test_static_method_call_prefixed() async {
-    await analyze('''
-import 'dart:async' as a;
-void f(void Function() callback) {
-  a.Timer.run(callback);
-}
-''');
-    // No assertions.  Just making sure this doesn't crash.
-  }
-
-  Future test_stringLiteral() async {
-    // TODO(paulberry): also test string interpolations
-    await analyze('''
-String f() {
-  return 'x';
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('String').node);
-  }
-
-  Future test_superExpression() async {
-    await analyze('''
-class B {
-  void f(int/*1*/ i, int/*2*/ j) {}
-}
-class C extends B {
-  void f(int/*3*/ i, int/*4*/ j) => super.f(j, i);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int/*3*/').node,
-        decoratedTypeAnnotation('int/*2*/').node,
-        hard: true);
-    assertEdge(decoratedTypeAnnotation('int/*4*/').node,
-        decoratedTypeAnnotation('int/*1*/').node,
-        hard: true);
-  }
-
-  Future test_superExpression_generic() async {
-    await analyze('''
-class B {
-  U g() => null;
-}
-class C extends B {
-  T f() => super.g();
-}
-''');
-    assertEdge(
-        substitutionNode(
-            substitutionNode(
-                inSet(pointsToNever), decoratedTypeAnnotation('T> {').node),
-            decoratedTypeAnnotation('U g').node),
-        decoratedTypeAnnotation('T f').node,
-        hard: false);
-  }
-
-  Future test_symbolLiteral() async {
-    await analyze('''
-Symbol f() {
-  return #symbol;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Symbol').node);
-  }
-
-  Future test_this_bangHint() async {
-    await analyze('''
-extension on int {
-  int f1() => this;
-  int f2() => this/*!*/;
-}
-''');
-    expect(
-        assertEdge(anyNode, decoratedTypeAnnotation('int f1').node, hard: true)
-            .sourceNode,
-        isNot(never));
-    expect(
-        assertEdge(anyNode, decoratedTypeAnnotation('int f2').node, hard: true)
-            .sourceNode,
-        never);
-    expect(hasNullCheckHint(findNode.this_('this/*!*/')), isTrue);
-  }
-
-  Future test_thisExpression() async {
-    await analyze('''
-class C {
-  C f() => this;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('C f').node);
-  }
-
-  Future test_thisExpression_generic() async {
-    await analyze('''
-class C {
-  C f() => this;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('C f').node);
-    assertNoUpstreamNullability(decoratedTypeAnnotation('T> f').node);
-  }
-
-  Future test_throwExpression() async {
-    await analyze('''
-int f() {
-  return throw null;
-}
-''');
-    var intNode = decoratedTypeAnnotation('int').node;
-    assertNoUpstreamNullability(intNode);
-    var edge = assertEdge(anyNode, intNode, hard: false);
-    expect(edge.sourceNode!.displayName, 'throw expression (test.dart:2:10)');
-  }
-
-  Future test_top_level_annotation_begins_flow_analysis() async {
-    await analyze('''
-class C {
-  const C(bool x);
-}
-@C(true)
-int x;
-''');
-  }
-
-  Future test_topLevelSetter() async {
-    await analyze('''
-void set x(int value) {}
-main() { x = 1; }
-''');
-    var setXType = decoratedTypeAnnotation('int value');
-    assertEdge(inSet(pointsToNever), setXType.node, hard: false);
-  }
-
-  Future test_topLevelSetter_nullable() async {
-    await analyze('''
-void set x(int value) {}
-main() { x = null; }
-''');
-    var setXType = decoratedTypeAnnotation('int value');
-    assertEdge(inSet(alwaysPlus), setXType.node, hard: false);
-  }
-
-  Future test_topLevelVar_implicitInitializer() async {
-    await analyze('int i;');
-    assertEdge(always, decoratedTypeAnnotation('int').node, hard: false);
-  }
-
-  Future test_topLevelVar_metadata() async {
-    await analyze('''
-class A {
-  const A();
-}
-@A()
-int v;
-''');
-    // No assertions needed; the AnnotationTracker mixin verifies that the
-    // metadata was visited.
-  }
-
-  Future test_topLevelVar_reference() async {
-    await analyze('''
-double pi = 3.1415;
-double get myPi => pi;
-''');
-    var piType = decoratedTypeAnnotation('double pi');
-    var myPiType = decoratedTypeAnnotation('double get');
-    assertEdge(piType.node, myPiType.node, hard: false);
-  }
-
-  Future test_topLevelVar_reference_differentPackage() async {
-    addPackageFile('foo', 'piConst.dart', '''
-double pi = 3.1415;
-''');
-    await analyze('''
-import "package:foo/piConst.dart";
-double get myPi => pi;
-''');
-    var myPiType = decoratedTypeAnnotation('double get');
-    assertEdge(inSet(pointsToNever), myPiType.node, hard: false);
-  }
-
-  Future test_topLevelVariable_type_inferred() async {
-    await analyze('''
-int f() => 1;
-var x = f();
-''');
-    var xType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    assertEdge(decoratedTypeAnnotation('int').node, xType.node, hard: false);
-  }
-
-  Future test_type_argument_explicit_bound() async {
-    await analyze('''
-class C {}
-void f(C c) {}
-''');
-    assertEdge(decoratedTypeAnnotation('int>').node,
-        decoratedTypeAnnotation('Object>').node,
-        hard: true);
-  }
-
-  Future test_type_parameter_method_call_bound() async {
-    await analyze('''
-class Foo {
-  void bar(int x) {}
-}
-
-void f(T t) {
-  t.bar(null);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('T t').node, never, hard: true);
-    // TODO(mfairhurst): fix this: https://github.com/dart-lang/sdk/issues/39852
-    //assertEdge(decoratedTypeAnnotation('Foo>').node, never, hard: true);
-    // There is a direct soft edge from always, since it's a public method,
-    // but we want to test there is also an edge resulting from t.bar(null)
-    // usage in f.
-    assertEdge(inSet(alwaysPlus.difference({always})),
-        decoratedTypeAnnotation('int x').node,
-        hard: false);
-  }
-
-  Future test_type_parameter_method_call_bound_bound() async {
-    await analyze('''
-class Foo {
-  void bar(int x) {}
-}
-
-void f(T t) {
-  t.bar(null);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('T t').node, never, hard: true);
-    // TODO(mfairhurst): fix this: https://github.com/dart-lang/sdk/issues/39852
-    //assertEdge(decoratedTypeAnnotation('Foo>').node, never, hard: true);
-    // There is a direct soft edge from always, since it's a public method,
-    // but we want to test there is also an edge resulting from t.bar(null)
-    // usage in f.
-    assertEdge(inSet(alwaysPlus.difference({always})),
-        decoratedTypeAnnotation('int x').node,
-        hard: false);
-  }
-
-  Future test_type_parameter_method_call_bound_generic() async {
-    await analyze('''
-class Foo {
-  void bar(int x) {}
-}
-
-void f>(T t) {
-  t.bar(null);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('T t').node, never, hard: true);
-    // TODO(mfairhurst): fix this: https://github.com/dart-lang/sdk/issues/39852
-    //assertEdge(decoratedTypeAnnotation('Foo>').node, never, hard: true);
-    // There is a direct soft edge from always, since it's a public method,
-    // but we want to test there is also an edge resulting from t.bar(null)
-    // usage in f.
-    assertEdge(inSet(alwaysPlus.difference({always})),
-        decoratedTypeAnnotation('int x').node,
-        hard: false);
-  }
-
-  Future test_type_parameter_method_call_bound_generic_complex() async {
-    await analyze('''
-class Foo {
-  void bar(T x) {}
-}
-
-void f>(T t) {
-  t.bar(null);
-}
-''');
-    assertEdge(decoratedTypeAnnotation('T t').node, never, hard: true);
-    // TODO(mfairhurst): fix this: https://github.com/dart-lang/sdk/issues/39852
-    //assertEdge(decoratedTypeAnnotation('Foo>').node, never, hard: true);
-    assertEdge(
-        inSet(alwaysPlus),
-        substitutionNode(decoratedTypeAnnotation('R>').node,
-            decoratedTypeAnnotation('T x').node),
-        hard: false);
-  }
-
-  Future test_type_parameterized_migrated_bound_class() async {
-    await analyze('''
-import 'dart:math';
-void f(Point x) {}
-''');
-    var pointClass = findNode.namedType('Point').element as ClassElement;
-    var pointBound =
-        variables.decoratedTypeParameterBound(pointClass.typeParameters[0])!;
-    _assertType(pointBound.type!, 'num');
-    assertEdge(decoratedTypeAnnotation('int>').node, pointBound.node,
-        hard: true);
-  }
-
-  Future test_type_parameterized_migrated_bound_dynamic() async {
-    await analyze('''
-void f(List x) {}
-''');
-    var listClass = typeProvider.listElement;
-    var listBound =
-        variables.decoratedTypeParameterBound(listClass.typeParameters[0])!;
-    _assertType(listBound.type!, 'dynamic');
-    assertEdge(decoratedTypeAnnotation('int>').node, listBound.node,
-        hard: true);
-  }
-
-  Future test_typedef_rhs_not_linked_to_usage() async {
-    await analyze('''
-typedef F = void Function();
-F f;
-''');
-    var rhs = decoratedGenericFunctionTypeAnnotation('void Function()');
-    var usage = decoratedTypeAnnotation('F f');
-    assertNoEdge(rhs.node, usage.node);
-  }
-
-  Future test_typeName_class() async {
-    await analyze('''
-class C {}
-Type f() => C;
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Type').node);
-  }
-
-  Future test_typeName_from_sdk() async {
-    await analyze('''
-Type f() {
-  return int;
-}
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Type').node);
-  }
-
-  Future test_typeName_from_sdk_prefixed() async {
-    await analyze('''
-import 'dart:async' as a;
-Type f() => a.Future;
-''');
-    assertEdge(inSet(neverClosure), decoratedTypeAnnotation('Type').node,
-        hard: false);
-  }
-
-  Future test_typeName_functionTypeAlias() async {
-    await analyze('''
-typedef void F();
-Type f() => F;
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Type').node);
-  }
-
-  Future test_typeName_genericTypeAlias() async {
-    await analyze('''
-typedef F = void Function();
-Type f() => F;
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Type').node);
-  }
-
-  Future test_typeName_mixin() async {
-    await analyze('''
-mixin M {}
-Type f() => M;
-''');
-    assertNoUpstreamNullability(decoratedTypeAnnotation('Type').node);
-  }
-
-  Future test_typeName_with_bound() async {
-    await analyze('''
-class C {}
-void f(C c) {}
-''');
-    var cType = decoratedTypeAnnotation('C c');
-    var cBound = decoratedTypeAnnotation('Object');
-    assertEdge(cType.typeArguments[0]!.node, cBound.node, hard: true);
-  }
-
-  Future test_typeName_with_bound_function_type() async {
-    await analyze('''
-class C {}
-void f(C c) {}
-''');
-    var cType = decoratedTypeAnnotation('C c');
-    var cBound = decoratedGenericFunctionTypeAnnotation('int Function()');
-    assertEdge(cType.typeArguments[0]!.node, cBound.node, hard: true);
-    assertEdge(
-        cType.typeArguments[0]!.returnType!.node, cBound.returnType!.node,
-        hard: true);
-  }
-
-  Future test_typeName_with_bounds() async {
-    await analyze('''
-class C {}
-void f(C c) {}
-''');
-    var cType = decoratedTypeAnnotation('C c');
-    var tBound = decoratedTypeAnnotation('Object,');
-    var uBound = decoratedTypeAnnotation('Object>');
-    assertEdge(cType.typeArguments[0]!.node, tBound.node, hard: true);
-    assertEdge(cType.typeArguments[1]!.node, uBound.node, hard: true);
-  }
-
-  Future test_variableDeclaration() async {
-    await analyze('''
-void f(int i) {
-  int j = i;
-}
-''');
-    assertEdge(decoratedTypeAnnotation('int i').node,
-        decoratedTypeAnnotation('int j').node,
-        hard: true);
-  }
-
-  void _assertType(DartType type, String expected) {
-    var typeStr = type.getDisplayString(withNullability: false);
-    expect(typeStr, expected);
-  }
-}
-
-class _DecoratedClassHierarchyForTesting implements DecoratedClassHierarchy {
-  late AssignmentCheckerTest assignmentCheckerTest;
-
-  @override
-  DecoratedType asInstanceOf(DecoratedType type, InterfaceElement? superclass) {
-    var class_ = (type.type as InterfaceType).element;
-    if (class_ == superclass) return type;
-    if (superclass!.name == 'Object') {
-      return DecoratedType(
-        superclass.instantiate(
-          typeArguments: const [],
-          nullabilitySuffix: NullabilitySuffix.star,
-        ),
-        type.node,
-      );
-    }
-    if (class_.name == 'MyListOfList' && superclass.name == 'List') {
-      return assignmentCheckerTest._myListOfListSupertype
-          .substitute({class_.typeParameters[0]: type.typeArguments[0]!});
-    }
-    if (class_.name == 'List' && superclass.name == 'Iterable') {
-      return DecoratedType(
-        superclass.instantiate(
-          typeArguments: [type.typeArguments[0]!.type!],
-          nullabilitySuffix: NullabilitySuffix.star,
-        ),
-        type.node,
-        typeArguments: [type.typeArguments[0]],
-      );
-    }
-    if (class_.name == 'Future' && superclass.name == 'FutureOr') {
-      return DecoratedType(
-        superclass.instantiate(
-          typeArguments: [type.typeArguments[0]!.type!],
-          nullabilitySuffix: NullabilitySuffix.star,
-        ),
-        type.node,
-        typeArguments: [type.typeArguments[0]],
-      );
-    }
-    throw UnimplementedError(
-        'TODO(paulberry): asInstanceOf($type, $superclass)');
-  }
-
-  @override
-  DecoratedType getDecoratedSupertype(
-      InterfaceElement class_, InterfaceElement superclass) {
-    throw UnimplementedError('TODO(paulberry)');
-  }
-}
-
-class _MockSource implements Source {
-  @override
-  final Uri uri;
-
-  _MockSource(this.uri);
-
-  @override
-  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
-}
-
-class _TestEdgeOrigin implements EdgeOrigin {
-  const _TestEdgeOrigin();
-
-  @override
-  CodeReference? get codeReference => null;
-
-  @override
-  String get description => 'Test edge';
-
-  @override
-  bool get isSetupAssignment => false;
-
-  @override
-  EdgeOriginKind? get kind => null;
-
-  @override
-  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
-}
diff --git a/pkg/nnbd_migration/test/edit_plan_test.dart b/pkg/nnbd_migration/test/edit_plan_test.dart
deleted file mode 100644
index 058bdd0c5a09..000000000000
--- a/pkg/nnbd_migration/test/edit_plan_test.dart
+++ /dev/null
@@ -1,1718 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/precedence.dart';
-import 'package:analyzer/dart/ast/token.dart';
-import 'package:analyzer/dart/ast/visitor.dart';
-import 'package:analyzer/source/line_info.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/utilities/hint_utils.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'abstract_single_unit.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(EditPlanTest);
-    defineReflectiveTests(EndsInCascadeTest);
-    defineReflectiveTests(PrecedenceTest);
-  });
-}
-
-@reflectiveTest
-class EditPlanTest extends AbstractSingleUnitTest {
-  String? code;
-
-  EditPlanner? _planner;
-
-  @override
-  bool get analyzeWithNnbd => true;
-
-  EditPlanner? get planner {
-    if (_planner == null) createPlanner();
-    return _planner;
-  }
-
-  Future analyze(String code) async {
-    this.code = code;
-    await resolveTestUnit(code);
-  }
-
-  Map> checkPlan(EditPlan plan, String expected,
-      {String? expectedIncludingInformative}) {
-    expectedIncludingInformative ??= expected;
-    var changes = planner!.finalize(plan)!;
-    expect(changes.applyTo(code!), expected);
-    expect(changes.applyTo(code!, includeInformative: true),
-        expectedIncludingInformative);
-    return changes;
-  }
-
-  void createPlanner({bool removeViaComments = false}) {
-    _planner = EditPlanner(testUnit!.lineInfo, code,
-        removeViaComments: removeViaComments);
-  }
-
-  NodeProducingEditPlan extract(AstNode inner, AstNode? outer) =>
-      planner!.extract(outer, planner!.passThrough(inner));
-
-  Future test_acceptLateHint() async {
-    var code = '/* late */ int x = 0;';
-    await analyze(code);
-    var hint = getPrefixHint(findNode.namedType('int').name2)!;
-    var changes = checkPlan(
-        planner!.acceptPrefixHint(
-            planner!.passThrough(findNode.namedType('int')), hint),
-        'late int x = 0;');
-    expect(changes.keys, unorderedEquals([0, 7]));
-    expect(changes[7], hasLength(1));
-    expect(changes[7]![0].length, 3);
-  }
-
-  Future test_acceptLateHint_space_needed_after() async {
-    var code = '/* late */int x = 0;';
-    await analyze(code);
-    var hint = getPrefixHint(findNode.namedType('int').name2)!;
-    checkPlan(
-        planner!.acceptPrefixHint(
-            planner!.passThrough(findNode.namedType('int')), hint),
-        'late int x = 0;');
-  }
-
-  Future test_acceptLateHint_space_needed_before() async {
-    var code = '@deprecated/* late */ int x = 0;';
-    await analyze(code);
-    var hint = getPrefixHint(findNode.namedType('int').name2)!;
-    checkPlan(
-        planner!.acceptPrefixHint(
-            planner!.passThrough(findNode.namedType('int')), hint),
-        '@deprecated late int x = 0;');
-  }
-
-  Future
-      test_acceptNullabilityHint_function_typed_field_formal_parameter() async {
-    await analyze('''
-class C {
-  void Function(int) f;
-  C(void this.f(int i) /*?*/);
-}
-''');
-    var parameter = findNode.fieldFormalParameter('void this.f(int i)');
-    var typeName = planner!.passThrough(parameter);
-    checkPlan(
-        planner!.acceptSuffixHint(
-            typeName, getPostfixHint(parameter.parameters!.rightParenthesis)!),
-        '''
-class C {
-  void Function(int) f;
-  C(void this.f(int i)?);
-}
-''');
-  }
-
-  Future test_acceptNullabilityHint_function_typed_parameter() async {
-    await analyze('f(void g(int i) /*?*/) {}');
-    var parameter = findNode.functionTypedFormalParameter('void g(int i)');
-    var typeName = planner!.passThrough(parameter);
-    checkPlan(
-        planner!.acceptSuffixHint(
-            typeName, getPostfixHint(parameter.parameters.rightParenthesis)!),
-        'f(void g(int i)?) {}');
-  }
-
-  Future test_acceptNullabilityOrNullCheckHint() async {
-    var code = 'int /*?*/ x = 0;';
-    await analyze(code);
-    var intRef = findNode.namedType('int');
-    var typeName = planner!.passThrough(intRef);
-    checkPlan(
-        planner!.acceptSuffixHint(typeName, getPostfixHint(intRef.name2)!),
-        'int? x = 0;');
-  }
-
-  Future test_acceptNullabilityOrNullCheckHint_inside_extract() async {
-    var code = 'f(x) => 3 * x /*!*/ * 4;';
-    await analyze(code);
-    var xRef = findNode.simple('x /*');
-    checkPlan(
-        planner!.extract(
-            xRef.parent!.parent,
-            planner!.acceptSuffixHint(
-                planner!.passThrough(xRef), getPostfixHint(xRef.token)!)),
-        'f(x) => x!;');
-  }
-
-  Future test_addBinaryPostfix_assignment_right_associative() async {
-    await analyze('_f(a, b, c) => a = b;');
-    // Admittedly this is sort of a bogus test case, since the code it produces
-    // (`(a = b) = c`) is non-grammatical.  But we still want to verify that it
-    // *doesn't* produce `a = b = c`, which would be grammatical but which would
-    // break apart the subexpression `a = b`.
-    checkPlan(
-        planner!.addBinaryPostfix(
-            planner!.passThrough(findNode.assignment('a = b')),
-            TokenType.EQ,
-            'c'),
-        '_f(a, b, c) => (a = b) = c;');
-  }
-
-  Future test_addBinaryPostfix_associative() async {
-    await analyze('var x = 1 - 2;');
-    checkPlan(
-        planner!.addBinaryPostfix(
-            planner!.passThrough(findNode.binary('-')), TokenType.MINUS, '3'),
-        'var x = 1 - 2 - 3;');
-  }
-
-  Future test_addBinaryPostfix_endsInCascade() async {
-    await analyze('f(x) => x..y = 1;');
-    checkPlan(
-        planner!.addBinaryPostfix(
-            planner!.passThrough(findNode.integerLiteral('1')),
-            TokenType.PLUS,
-            '2'),
-        'f(x) => x..y = 1 + 2;');
-  }
-
-  Future test_addBinaryPostfix_equality_non_associative() async {
-    await analyze('var x = 1 == 2;');
-    checkPlan(
-        planner!.addBinaryPostfix(
-            planner!.passThrough(findNode.binary('==')), TokenType.EQ_EQ, '3'),
-        'var x = (1 == 2) == 3;');
-  }
-
-  Future test_addBinaryPostfix_inner_precedence() async {
-    await analyze('var x = 1 < 2;');
-    checkPlan(
-        planner!.addBinaryPostfix(planner!.passThrough(findNode.binary('<')),
-            TokenType.EQ_EQ, 'true'),
-        'var x = 1 < 2 == true;');
-    checkPlan(
-        planner!.addBinaryPostfix(
-            planner!.passThrough(findNode.binary('<')), TokenType.AS, 'bool'),
-        'var x = (1 < 2) as bool;');
-  }
-
-  Future test_addBinaryPostfix_outer_precedence() async {
-    await analyze('var x = 1 == true;');
-    checkPlan(
-        planner!.addBinaryPostfix(
-            planner!.passThrough(findNode.integerLiteral('1')),
-            TokenType.LT,
-            '2'),
-        'var x = 1 < 2 == true;');
-    checkPlan(
-        planner!.addBinaryPostfix(
-            planner!.passThrough(findNode.integerLiteral('1')),
-            TokenType.EQ_EQ,
-            '2'),
-        'var x = (1 == 2) == true;');
-  }
-
-  Future test_addBinaryPostfix_to_expression_function() async {
-    await analyze('var x = () => null;');
-    checkPlan(
-        planner!.addBinaryPostfix(
-            planner!.passThrough(findNode.functionExpression('()')),
-            TokenType.AS,
-            'Object'),
-        'var x = (() => null) as Object;');
-  }
-
-  Future test_addBinaryPrefix_allowCascade() async {
-    await analyze('f(x) => 1..isEven;');
-    checkPlan(
-        planner!.addBinaryPrefix(
-            'x..y', TokenType.EQ, planner!.passThrough(findNode.cascade('..'))),
-        'f(x) => x..y = (1..isEven);');
-    checkPlan(
-        planner!.addBinaryPrefix(
-            'x', TokenType.EQ, planner!.passThrough(findNode.cascade('..')),
-            allowCascade: true),
-        'f(x) => x = 1..isEven;');
-  }
-
-  Future test_addBinaryPrefix_assignment_right_associative() async {
-    await analyze('_f(a, b, c) => b = c;');
-    checkPlan(
-        planner!.addBinaryPrefix('a', TokenType.EQ,
-            planner!.passThrough(findNode.assignment('b = c'))),
-        '_f(a, b, c) => a = b = c;');
-  }
-
-  Future test_addBinaryPrefix_associative() async {
-    await analyze('var x = 1 - 2;');
-    checkPlan(
-        planner!.addBinaryPrefix(
-            '0', TokenType.MINUS, planner!.passThrough(findNode.binary('-'))),
-        'var x = 0 - (1 - 2);');
-  }
-
-  Future test_addBinaryPrefix_outer_precedence() async {
-    await analyze('var x = 2 == true;');
-    checkPlan(
-        planner!.addBinaryPrefix('1', TokenType.LT,
-            planner!.passThrough(findNode.integerLiteral('2'))),
-        'var x = 1 < 2 == true;');
-    checkPlan(
-        planner!.addBinaryPrefix('1', TokenType.EQ_EQ,
-            planner!.passThrough(findNode.integerLiteral('2'))),
-        'var x = (1 == 2) == true;');
-  }
-
-  Future test_addBinaryPrefix_to_expression_function() async {
-    await analyze('f(x) => () => null;');
-    checkPlan(
-        planner!.addBinaryPrefix('x', TokenType.EQ,
-            planner!.passThrough(findNode.functionExpression('()'))),
-        'f(x) => x = () => null;');
-  }
-
-  Future test_addCommentPostfix_before_closer() async {
-    await analyze('f(g) => g(0);');
-    checkPlan(
-        planner!.addCommentPostfix(
-            planner!.passThrough(findNode.integerLiteral('0')), '/* zero */'),
-        'f(g) => g(0 /* zero */);');
-  }
-
-  Future test_addCommentPostfix_before_other() async {
-    await analyze('f() => 0.isEven;');
-    checkPlan(
-        planner!.addCommentPostfix(
-            planner!.passThrough(findNode.integerLiteral('0')), '/* zero */'),
-        'f() => 0 /* zero */ .isEven;');
-  }
-
-  Future test_addCommentPostfix_before_semicolon() async {
-    await analyze('f() => 0;');
-    checkPlan(
-        planner!.addCommentPostfix(
-            planner!.passThrough(findNode.integerLiteral('0')), '/* zero */'),
-        'f() => 0 /* zero */;');
-  }
-
-  Future test_addCommentPostfix_before_space() async {
-    await analyze('f() => 0 + 1;');
-    checkPlan(
-        planner!.addCommentPostfix(
-            planner!.passThrough(findNode.integerLiteral('0')), '/* zero */'),
-        'f() => 0 /* zero */ + 1;');
-  }
-
-  Future test_addCommentPostfix_informative() async {
-    await analyze('f() => 0.isEven;');
-    checkPlan(
-        planner!.addCommentPostfix(
-            planner!.passThrough(findNode.integerLiteral('0')), '/* zero */',
-            isInformative: true),
-        'f() => 0.isEven;',
-        expectedIncludingInformative: 'f() => 0 /* zero */ .isEven;');
-  }
-
-  Future test_addPostfix_inner_precedence_add_parens() async {
-    await analyze('f(x) => -x;');
-    checkPlan(
-        planner!
-            .addPostfix(planner!.passThrough(findNode.prefix('-x')), '.abs()'),
-        'f(x) => (-x).abs();');
-  }
-
-  Future test_addPostfix_inner_precedence_no_parens() async {
-    await analyze('f(x) => x++;');
-    checkPlan(
-        planner!.addPostfix(
-            planner!.passThrough(findNode.postfix('x++')), '.abs()'),
-        'f(x) => x++.abs();');
-  }
-
-  Future test_addPostfix_outer_precedence() async {
-    await analyze('f(x) => x/*!*/;');
-    checkPlan(
-        planner!.addPostfix(
-            planner!.passThrough(findNode.simple('x/*!*/')), '.abs()'),
-        'f(x) => x.abs()/*!*/;');
-  }
-
-  Future test_addUnaryPostfix_inner_precedence_add_parens() async {
-    await analyze('f(x) => -x;');
-    checkPlan(
-        planner!.addUnaryPostfix(
-            planner!.passThrough(findNode.prefix('-x')), TokenType.BANG),
-        'f(x) => (-x)!;');
-  }
-
-  Future test_addUnaryPostfix_inner_precedence_no_parens() async {
-    await analyze('f(x) => x++;');
-    checkPlan(
-        planner!.addUnaryPostfix(
-            planner!.passThrough(findNode.postfix('x++')), TokenType.BANG),
-        'f(x) => x++!;');
-  }
-
-  Future test_addUnaryPostfix_outer_precedence() async {
-    await analyze('f(x) => x/*!*/;');
-    checkPlan(
-        planner!.addUnaryPostfix(
-            planner!.passThrough(findNode.simple('x/*!*/')),
-            TokenType.PLUS_PLUS),
-        'f(x) => x++/*!*/;');
-  }
-
-  Future test_addUnaryPrefix_inner_precedence_add_parens() async {
-    await analyze('f(x, y) => x * y;');
-    checkPlan(
-        planner!.addUnaryPrefix(
-            TokenType.MINUS, planner!.passThrough(findNode.binary('*'))),
-        'f(x, y) => -(x * y);');
-  }
-
-  Future test_addUnaryPrefix_inner_precedence_no_parens() async {
-    await analyze('f(x) => -x;');
-    // TODO(paulberry): if we added a `-` instead of a `~`, the result would
-    // scan as a single `--` token, so we would need parens.  Add support for
-    // this corner case.
-    checkPlan(
-        planner!.addUnaryPrefix(
-            TokenType.TILDE, planner!.passThrough(findNode.prefix('-x'))),
-        'f(x) => ~-x;');
-  }
-
-  Future test_addUnaryPrefix_outer_precedence_add_parens() async {
-    await analyze('f(x) => x!;');
-    checkPlan(
-        planner!.addUnaryPrefix(
-            TokenType.MINUS, planner!.passThrough(findNode.simple('x!'))),
-        'f(x) => (-x)!;');
-  }
-
-  Future test_addUnaryPrefix_outer_precedence_no_parens() async {
-    await analyze('f(x) => -x;');
-    // TODO(paulberry): if we added a `-` instead of a `~`, the result would
-    // scan as a single `--` token, so we would need parens.  Add support for
-    // this corner case.
-    checkPlan(
-        planner!.addUnaryPrefix(
-            TokenType.TILDE, planner!.passThrough(findNode.simple('x;'))),
-        'f(x) => -~x;');
-  }
-
-  Future test_cascadeSearchLimit() async {
-    // Ok, we have to ask each parent if it represents a cascade section.
-    // If we create a passThrough at node N, then when we create an enclosing
-    // passThrough, the first thing we'll check is N's parent.
-    await analyze('f(a, c) => a..b = c = 1;');
-    var cascade = findNode.cascade('..');
-    var outerAssignment = findNode.assignment('= c');
-    assert(identical(cascade, outerAssignment.parent));
-    var innerAssignment = findNode.assignment('= 1');
-    assert(identical(outerAssignment, innerAssignment.parent));
-    var one = findNode.integerLiteral('1');
-    assert(identical(innerAssignment, one.parent));
-    // The tests below will be based on an inner plan that adds `..isEven` after
-    // the `1`.
-    EditPlan makeInnerPlan() => planner!.surround(planner!.passThrough(one),
-        suffix: [AtomicEdit.insert('..isEven')], endsInCascade: true);
-    {
-      // If we make a plan that passes through `c = 1`, containing a plan that
-      // adds `..isEven` to `1`, then we don't necessarily want to add parens yet,
-      // because we might not keep the cascade section above it.
-      var plan =
-          planner!.passThrough(innerAssignment, innerPlans: [makeInnerPlan()]);
-      // `endsInCascade` returns true because we haven't committed to adding
-      // parens, so we need to remember that the presence of `..isEven` may
-      // require parens later.
-      expect(plan.endsInCascade, true);
-      checkPlan(planner!.extract(cascade, plan), 'f(a, c) => c = 1..isEven;');
-    }
-    {
-      // If we make a plan that passes through `..b = c = 1`, containing a plan
-      // that adds `..isEven` to `1`, then we do necessarily want to add parens,
-      // because we're committed to keeping the cascade section.
-      var plan =
-          planner!.passThrough(outerAssignment, innerPlans: [makeInnerPlan()]);
-      // We can tell that the parens have been finalized because `endsInCascade`
-      // returns false now.
-      expect(plan.endsInCascade, false);
-      checkPlan(plan, 'f(a, c) => a..b = (c = 1..isEven);');
-    }
-  }
-
-  Future test_dropNullabilityHint() async {
-    var code = 'int /*!*/ x = 0;';
-    await analyze(code);
-    var intRef = findNode.namedType('int');
-    var typeName = planner!.passThrough(intRef);
-    checkPlan(
-        planner!.dropNullabilityHint(typeName, getPostfixHint(intRef.name2)!),
-        'int x = 0;');
-  }
-
-  Future test_dropNullabilityHint_space_before_must_be_kept() async {
-    var code = 'int /*!*/x = 0;';
-    await analyze(code);
-    var intRef = findNode.namedType('int');
-    var typeName = planner!.passThrough(intRef);
-    var changes = checkPlan(
-        planner!.dropNullabilityHint(typeName, getPostfixHint(intRef.name2)!),
-        'int x = 0;');
-    expect(changes.keys, unorderedEquals([code.indexOf('/*')]));
-  }
-
-  Future test_dropNullabilityHint_space_needed() async {
-    var code = 'int/*!*/x = 0;';
-    await analyze(code);
-    var intRef = findNode.namedType('int');
-    var typeName = planner!.passThrough(intRef);
-    checkPlan(
-        planner!.dropNullabilityHint(typeName, getPostfixHint(intRef.name2)!),
-        'int x = 0;');
-  }
-
-  Future test_dropNullabilityHint_tight_no_space_needed() async {
-    // We try to minimize how much we alter the source code, so we don't insert
-    // a space in this example even though it would look prettier to do so.
-    var code = 'void Function()/*!*/x = () {};';
-    await analyze(code);
-    var functionType = findNode.genericFunctionType('Function');
-    var typeName = planner!.passThrough(functionType);
-    checkPlan(
-        planner!.dropNullabilityHint(
-            typeName, getPostfixHint(functionType.endToken)!),
-        'void Function()x = () {};');
-  }
-
-  Future test_explainNonNullable() async {
-    await analyze('int x = 0;');
-    checkPlan(
-        planner!.explainNonNullable(
-            planner!.passThrough(findNode.typeAnnotation('int'))),
-        'int x = 0;',
-        expectedIncludingInformative: 'int  x = 0;');
-  }
-
-  Future test_extract_add_parens() async {
-    await analyze('f(g) => 1 * g(2, 3 + 4, 5);');
-    checkPlan(
-        extract(
-            findNode.binary('+'), findNode.functionExpressionInvocation('+')),
-        'f(g) => 1 * (3 + 4);');
-  }
-
-  Future test_extract_inner_endsInCascade() async {
-    await analyze('f(a, g) => a..b = g(0, 1..isEven, 2);');
-    expect(
-        extract(findNode.cascade('1..isEven'),
-                findNode.functionExpressionInvocation('g('))
-            .endsInCascade,
-        true);
-    expect(
-        extract(findNode.integerLiteral('1'),
-                findNode.functionExpressionInvocation('g('))
-            .endsInCascade,
-        false);
-  }
-
-  Future test_extract_left() async {
-    await analyze('var x = 1 + 2;');
-    checkPlan(extract(findNode.integerLiteral('1'), findNode.binary('+')),
-        'var x = 1;');
-  }
-
-  Future test_extract_no_parens_needed() async {
-    await analyze('var x = 1 + 2 * 3;');
-    checkPlan(extract(findNode.integerLiteral('2'), findNode.binary('*')),
-        'var x = 1 + 2;');
-  }
-
-  Future test_extract_preserve_parens() async {
-    // Note: extra spaces to verify that we are really preserving the parens
-    // rather than removing them and adding new ones.
-    await analyze('var x = ( 1 << 2 ) * 3 + 4;');
-    checkPlan(extract(findNode.binary('<<'), findNode.binary('*')),
-        'var x = ( 1 << 2 ) + 4;');
-  }
-
-  Future test_extract_remove_parens() async {
-    await analyze('var x = (1 + 2) * 3 << 4;');
-    checkPlan(extract(findNode.binary('+'), findNode.binary('*')),
-        'var x = 1 + 2 << 4;');
-  }
-
-  Future test_extract_remove_redundant_parens() async {
-    await analyze('var x = (1 * 2) + 3;');
-    var times = findNode.binary('*');
-    checkPlan(extract(times, times.parent), 'var x = 1 * 2 + 3;');
-  }
-
-  Future test_extract_try_to_remove_necessary_parens() async {
-    // This is a weird corner case.  We try to extract the expression `1 + 2`
-    // from `( 1 + 2 )`, meaning we should remove parens.  But the parens are
-    // necessary.  So we create fresh ones (without the spaces).
-    await analyze('var x = ( 1 + 2 ) * 3;');
-    var plus = findNode.binary('+');
-    checkPlan(extract(plus, plus.parent), 'var x = (1 + 2) * 3;');
-  }
-
-  Future test_extract_using_comments_inner() async {
-    await analyze('var x = 1 + 2 * 3;');
-    createPlanner(removeViaComments: true);
-    checkPlan(extract(findNode.integerLiteral('2'), findNode.binary('+')),
-        'var x = /* 1 + */ 2 /* * 3 */;');
-  }
-
-  Future test_extract_using_comments_left() async {
-    await analyze('var x = 1 + 2;');
-    createPlanner(removeViaComments: true);
-    checkPlan(extract(findNode.integerLiteral('1'), findNode.binary('+')),
-        'var x = 1 /* + 2 */;');
-  }
-
-  Future test_extract_using_comments_right() async {
-    await analyze('var x = 1 + 2;');
-    createPlanner(removeViaComments: true);
-    checkPlan(extract(findNode.integerLiteral('2'), findNode.binary('+')),
-        'var x = /* 1 + */ 2;');
-  }
-
-  Future test_finalize_compilationUnit() async {
-    // Verify that an edit plan referring to the entire compilation unit can be
-    // finalized.  (This is an important corner case because the entire
-    // compilation unit is an AstNode with no parent).
-    await analyze('var x = 0;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(testUnit),
-            suffix: [AtomicEdit.insert(' var y = 0;')]),
-        'var x = 0; var y = 0;');
-  }
-
-  Future test_informativeMessageForToken() async {
-    await analyze('f(x) => x + 1;');
-    var sum = findNode.binary('+');
-    var info = _MockInfo();
-    var changes = checkPlan(
-        planner!.passThrough(sum, innerPlans: [
-          planner!.informativeMessageForToken(sum, sum.operator, info: info)
-        ]),
-        'f(x) => x + 1;',
-        expectedIncludingInformative: 'f(x) => x  1;');
-    var expectedOffset = sum.operator.offset;
-    expect(changes.keys, unorderedEquals([expectedOffset]));
-    expect(changes[expectedOffset], hasLength(1));
-    expect(changes[expectedOffset]![0].length, '+'.length);
-    expect(changes[expectedOffset]![0].replacement, '');
-    expect(changes[expectedOffset]![0].isInformative, isTrue);
-    expect(changes[expectedOffset]![0].info, same(info));
-  }
-
-  Future test_insertText() async {
-    await analyze('final x = 1;');
-    var variableDeclarationList = findNode.variableDeclarationList('final');
-    checkPlan(
-        planner!.insertText(
-            variableDeclarationList,
-            variableDeclarationList.variables.first.offset,
-            [AtomicEdit.insert('int ')]),
-        'final int x = 1;');
-  }
-
-  Future test_makeNullable() async {
-    await analyze('int x = 0;');
-    checkPlan(
-        planner!
-            .makeNullable(planner!.passThrough(findNode.typeAnnotation('int'))),
-        'int? x = 0;');
-  }
-
-  Future test_passThrough_remove_statement() async {
-    await analyze('''
-void f() {
-  var x = () {
-    1;
-    2;
-    3;
-  };
-}
-''');
-    var innerPlan = planner!.removeNode(findNode.statement('2'));
-    var outerPlan = planner!.passThrough(findNode.variableDeclaration('x'),
-        innerPlans: [innerPlan]);
-    checkPlan(outerPlan, '''
-void f() {
-  var x = () {
-    1;
-    3;
-  };
-}
-''');
-  }
-
-  Future test_remove_all_list_elements_with_trailing_separator() async {
-    await analyze('var x = [ 1, 2, ];');
-    var i1 = findNode.integerLiteral('1');
-    var i2 = findNode.integerLiteral('2');
-    checkPlan(
-        planner!.passThrough(i1.parent,
-            innerPlans: [planner!.removeNode(i1), planner!.removeNode(i2)]),
-        'var x = [];');
-  }
-
-  Future test_remove_argument() async {
-    await analyze('f(dynamic d) => d(1, 2, 3);');
-    var i2 = findNode.integerLiteral('2');
-    var changes =
-        checkPlan(planner!.removeNode(i2), 'f(dynamic d) => d(1, 3);');
-    expect(changes.keys, [i2.offset]);
-  }
-
-  Future test_remove_class_member() async {
-    await analyze('''
-class C {
-  int? x;
-  int? y;
-  int? z;
-}
-''');
-    var declaration = findNode.fieldDeclaration('y');
-    var changes = checkPlan(planner!.removeNode(declaration), '''
-class C {
-  int? x;
-  int? z;
-}
-''');
-    expect(changes.keys, [declaration.offset - 2]);
-  }
-
-  Future
-      test_remove_elements_of_related_lists_at_different_levels() async {
-    await analyze('var x = [[1, 2], 3, 4];');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    checkPlan(
-        planner!.passThrough(testUnit,
-            innerPlans: [planner!.removeNode(i2), planner!.removeNode(i3)]),
-        'var x = [[1], 4];');
-  }
-
-  Future
-      test_remove_elements_of_sibling_lists_passThrough_container() async {
-    await analyze('var x = [[1, 2], [3, 4]];');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    checkPlan(
-        planner!.passThrough(i2.parent!.parent,
-            innerPlans: [planner!.removeNode(i2), planner!.removeNode(i3)]),
-        'var x = [[1], [4]];');
-  }
-
-  Future test_remove_elements_of_sibling_lists_passThrough_unit() async {
-    await analyze('var x = [[1, 2], [3, 4]];');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    checkPlan(
-        planner!.passThrough(testUnit,
-            innerPlans: [planner!.removeNode(i2), planner!.removeNode(i3)]),
-        'var x = [[1], [4]];');
-  }
-
-  Future test_remove_enum_constant() async {
-    await analyze('''
-enum E {
-  A,
-  B,
-  C
-}
-''');
-    var enumConstant = findNode.enumConstantDeclaration('B');
-    var changes = checkPlan(planner!.removeNode(enumConstant), '''
-enum E {
-  A,
-  C
-}
-''');
-    expect(changes.keys, [enumConstant.offset - 2]);
-  }
-
-  Future test_remove_field_declaration() async {
-    await analyze('''
-class C {
-  int? x, y, z;
-}
-''');
-    var declaration = findNode.variableDeclaration('y');
-    var changes = checkPlan(planner!.removeNode(declaration), '''
-class C {
-  int? x, z;
-}
-''');
-    expect(changes.keys, [declaration.offset]);
-  }
-
-  Future test_remove_list_element() async {
-    await analyze('var x = [1, 2, 3];');
-    var i2 = findNode.integerLiteral('2');
-    var changes = checkPlan(planner!.removeNode(i2), 'var x = [1, 3];');
-    expect(changes.keys, [i2.offset]);
-  }
-
-  Future test_remove_list_element_at_list_end() async {
-    await analyze('var x = [1, 2, 3];');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    var changes = checkPlan(planner!.removeNode(i3), 'var x = [1, 2];');
-    expect(changes.keys, [i2.end]);
-  }
-
-  Future test_remove_list_element_singleton() async {
-    await analyze('var x = [1];');
-    var i1 = findNode.integerLiteral('1');
-    checkPlan(planner!.removeNode(i1), 'var x = [];');
-  }
-
-  Future test_remove_list_element_with_trailing_separator() async {
-    await analyze('var x = [1, 2, 3, ];');
-    var i3 = findNode.integerLiteral('3');
-    checkPlan(planner!.removeNode(i3), 'var x = [1, 2, ];');
-  }
-
-  Future test_remove_list_elements() async {
-    await analyze('var x = [1, 2, 3, 4, 5];');
-    var i2 = findNode.integerLiteral('2');
-    var i4 = findNode.integerLiteral('4');
-    var changes = checkPlan(
-        planner!.passThrough(i2.parent,
-            innerPlans: [planner!.removeNode(i2), planner!.removeNode(i4)]),
-        'var x = [1, 3, 5];');
-    expect(changes.keys, unorderedEquals([i2.offset, i4.offset]));
-  }
-
-  Future test_remove_list_elements_all() async {
-    await analyze('var x = [1, 2];');
-    var i1 = findNode.integerLiteral('1');
-    var i2 = findNode.integerLiteral('2');
-    checkPlan(
-        planner!.passThrough(i1.parent,
-            innerPlans: [planner!.removeNode(i1), planner!.removeNode(i2)]),
-        'var x = [];');
-  }
-
-  Future test_remove_list_elements_all_asUnit() async {
-    await analyze('var x = [1, 2];');
-    var i1 = findNode.integerLiteral('1');
-    var i2 = findNode.integerLiteral('2');
-    checkPlan(planner!.removeNodes(i1, i2), 'var x = [];');
-  }
-
-  Future test_remove_list_elements_all_passThrough_unit() async {
-    await analyze('var x = [1, 2];');
-    var i1 = findNode.integerLiteral('1');
-    var i2 = findNode.integerLiteral('2');
-    checkPlan(
-        planner!.passThrough(testUnit,
-            innerPlans: [planner!.removeNode(i1), planner!.removeNode(i2)]),
-        'var x = [];');
-  }
-
-  Future test_remove_list_elements_at_list_end() async {
-    await analyze('var x = [1, 2, 3];');
-    var i1 = findNode.integerLiteral('1');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    var changes = checkPlan(
-        planner!.passThrough(i2.parent,
-            innerPlans: [planner!.removeNode(i2), planner!.removeNode(i3)]),
-        'var x = [1];');
-    expect(changes.keys, unorderedEquals([i1.end, i2.end]));
-  }
-
-  Future test_remove_list_elements_at_list_end_asUnit() async {
-    await analyze('var x = [1, 2, 3];');
-    var i1 = findNode.integerLiteral('1');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    var changes = checkPlan(planner!.removeNodes(i2, i3), 'var x = [1];');
-    expect(changes.keys, [i1.end]);
-  }
-
-  Future test_remove_list_elements_consecutive_asUnit() async {
-    await analyze('var x = [1, 2, 3, 4];');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    var changes = checkPlan(planner!.removeNodes(i2, i3), 'var x = [1, 4];');
-    expect(changes.keys, [i2.offset]);
-  }
-
-  Future
-      test_remove_list_elements_consecutive_at_list_end_using_comments() async {
-    await analyze('var x = [1, 2, 3];');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    createPlanner(removeViaComments: true);
-    checkPlan(
-        planner!.passThrough(i2.parent,
-            innerPlans: [planner!.removeNode(i2), planner!.removeNode(i3)]),
-        'var x = [1/* , 2 *//* , 3 */];');
-  }
-
-  Future test_remove_list_elements_consecutive_using_comments() async {
-    await analyze('var x = [1, 2, 3, 4];');
-    var i2 = findNode.integerLiteral('2');
-    var i3 = findNode.integerLiteral('3');
-    createPlanner(removeViaComments: true);
-    checkPlan(
-        planner!.passThrough(i2.parent,
-            innerPlans: [planner!.removeNode(i2), planner!.removeNode(i3)]),
-        'var x = [1, /* 2, */ /* 3, */ 4];');
-  }
-
-  Future test_remove_list_elements_using_comments() async {
-    await analyze('var x = [1, 2, 3, 4, 5];');
-    var i2 = findNode.integerLiteral('2');
-    var i4 = findNode.integerLiteral('4');
-    createPlanner(removeViaComments: true);
-    checkPlan(
-        planner!.passThrough(i2.parent,
-            innerPlans: [planner!.removeNode(i2), planner!.removeNode(i4)]),
-        'var x = [1, /* 2, */ 3, /* 4, */ 5];');
-  }
-
-  Future test_remove_map_element() async {
-    await analyze('var x = {1: 2, 3: 4, 5: 6};');
-    var entry = findNode.integerLiteral('3').parent!;
-    var changes =
-        checkPlan(planner!.removeNode(entry), 'var x = {1: 2, 5: 6};');
-    expect(changes.keys, [entry.offset]);
-  }
-
-  Future
-      test_remove_metadata_from_defaultFormalParameter_all_full_line() async {
-    await analyze('''
-f({
-  @deprecated
-  int? x}) {}''');
-    var deprecated = findNode.annotation('@deprecated');
-    checkPlan(
-        planner!.passThrough(deprecated.parent,
-            innerPlans: [planner!.removeNode(deprecated)]),
-        '''
-f({
-  int? x}) {}''');
-  }
-
-  Future test_remove_metadata_from_method_declaration() async {
-    await analyze('''
-class C {
-  @deprecated
-  f() {}
-}
-''');
-    var deprecated = findNode.annotation('@deprecated');
-    checkPlan(
-        planner!.passThrough(deprecated.parent,
-            innerPlans: [planner!.removeNode(deprecated)]),
-        '''
-class C {
-  f() {}
-}
-''');
-  }
-
-  Future test_remove_parameter() async {
-    await analyze('f(int x, int y, int z) => null;');
-    var parameter = findNode.simpleFormalParameter('y');
-    var changes =
-        checkPlan(planner!.removeNode(parameter), 'f(int x, int z) => null;');
-    expect(changes.keys, [parameter.offset]);
-  }
-
-  Future test_remove_set_element() async {
-    await analyze('var x = {1, 2, 3};');
-    var i2 = findNode.integerLiteral('2');
-    var changes = checkPlan(planner!.removeNode(i2), 'var x = {1, 3};');
-    expect(changes.keys, [i2.offset]);
-  }
-
-  Future test_remove_statement() async {
-    await analyze('''
-void f() {
-  1;
-  2;
-  3;
-}
-''');
-    checkPlan(planner!.removeNode(findNode.statement('2')), '''
-void f() {
-  1;
-  3;
-}
-''');
-  }
-
-  Future test_remove_statement_first_of_many_on_line() async {
-    await analyze('''
-void f() {
-  1;
-  2; 3;
-  4;
-}
-''');
-    checkPlan(planner!.removeNode(findNode.statement('2')), '''
-void f() {
-  1;
-  3;
-  4;
-}
-''');
-  }
-
-  Future test_remove_statement_last_of_many_on_line() async {
-    await analyze('''
-void f() {
-  1;
-  2; 3;
-  4;
-}
-''');
-    checkPlan(planner!.removeNode(findNode.statement('3')), '''
-void f() {
-  1;
-  2;
-  4;
-}
-''');
-  }
-
-  Future test_remove_statement_middle_of_many_on_line() async {
-    await analyze('''
-void f() {
-  1;
-  2; 3; 4;
-  5;
-}
-''');
-    checkPlan(planner!.removeNode(findNode.statement('3')), '''
-void f() {
-  1;
-  2; 4;
-  5;
-}
-''');
-  }
-
-  Future test_remove_statement_using_comments() async {
-    await analyze('''
-void f() {
-  1;
-  2;
-  3;
-}
-''');
-    createPlanner(removeViaComments: true);
-    checkPlan(planner!.removeNode(findNode.statement('2')), '''
-void f() {
-  1;
-  /* 2; */
-  3;
-}
-''');
-  }
-
-  Future test_remove_statements_asUnit() async {
-    await analyze('''
-void f() {
-  1;
-  2;
-
-  3;
-  4;
-}
-''');
-    var s2 = findNode.statement('2');
-    var s3 = findNode.statement('3');
-    var changes = checkPlan(planner!.removeNodes(s2, s3), '''
-void f() {
-  1;
-  4;
-}
-''');
-    expect(changes, hasLength(1));
-  }
-
-  Future test_remove_statements_consecutive_three() async {
-    await analyze('''
-void f() {
-  1;
-  2;
-
-  3;
-
-  4;
-  5;
-}
-''');
-    var s2 = findNode.statement('2');
-    var s3 = findNode.statement('3');
-    var s4 = findNode.statement('4');
-    var changes = checkPlan(
-        planner!.passThrough(s2.parent, innerPlans: [
-          planner!.removeNode(s2),
-          planner!.removeNode(s3),
-          planner!.removeNode(s4)
-        ]),
-        '''
-void f() {
-  1;
-  5;
-}
-''');
-    expect(changes.keys,
-        unorderedEquals([s2.offset - 2, s3.offset - 2, s4.offset - 2]));
-  }
-
-  Future test_remove_statements_consecutive_two() async {
-    await analyze('''
-void f() {
-  1;
-  2;
-
-  3;
-  4;
-}
-''');
-    var s2 = findNode.statement('2');
-    var s3 = findNode.statement('3');
-    var changes = checkPlan(
-        planner!.passThrough(s2.parent,
-            innerPlans: [planner!.removeNode(s2), planner!.removeNode(s3)]),
-        '''
-void f() {
-  1;
-  4;
-}
-''');
-    expect(changes.keys, unorderedEquals([s2.offset - 2, s3.offset - 2]));
-  }
-
-  Future test_remove_statements_nonconsecutive() async {
-    await analyze('''
-void f() {
-  1;
-  2;
-  3;
-  4;
-  5;
-}
-''');
-    var s2 = findNode.statement('2');
-    var s4 = findNode.statement('4');
-    var changes = checkPlan(
-        planner!.passThrough(s2.parent,
-            innerPlans: [planner!.removeNode(s2), planner!.removeNode(s4)]),
-        '''
-void f() {
-  1;
-  3;
-  5;
-}
-''');
-    expect(changes, hasLength(2));
-  }
-
-  Future test_remove_statements_singleton() async {
-    await analyze('''
-void f() {
-  1;
-}
-''');
-    checkPlan(planner!.removeNode(findNode.statement('1')), '''
-void f() {}
-''');
-  }
-
-  Future test_remove_statements_singleton_with_following_comment() async {
-    await analyze('''
-void f() {
-  1;
-  // Foo
-}
-''');
-    checkPlan(planner!.removeNode(findNode.statement('1')), '''
-void f() {
-  // Foo
-}
-''');
-  }
-
-  Future test_remove_statements_singleton_with_preceding_comment() async {
-    await analyze('''
-void f() {
-  // Foo
-  1;
-}
-''');
-    checkPlan(planner!.removeNode(findNode.statement('1')), '''
-void f() {
-  // Foo
-}
-''');
-  }
-
-  Future test_remove_statements_using_comments() async {
-    await analyze('''
-void f() {
-  1;
-  2;
-  3;
-  4;
-}
-''');
-    createPlanner(removeViaComments: true);
-    var s2 = findNode.statement('2');
-    var s3 = findNode.statement('3');
-    checkPlan(
-        planner!.passThrough(s2.parent,
-            innerPlans: [planner!.removeNode(s2), planner!.removeNode(s3)]),
-        '''
-void f() {
-  1;
-  /* 2; */
-  /* 3; */
-  4;
-}
-''');
-  }
-
-  Future test_remove_top_level_declaration() async {
-    await analyze('''
-class C {}
-class D {}
-class E {}
-''');
-    var declaration = findNode.classDeclaration('D');
-    var changes = checkPlan(planner!.removeNode(declaration), '''
-class C {}
-class E {}
-''');
-    expect(changes.keys, [declaration.offset]);
-  }
-
-  Future test_remove_top_level_directive() async {
-    await analyze('''
-import 'dart:io';
-import 'dart:async';
-import 'dart:math';
-''');
-    var directive = findNode.import('async');
-    var changes = checkPlan(planner!.removeNode(directive), '''
-import 'dart:io';
-import 'dart:math';
-''');
-    expect(changes.keys, [directive.offset]);
-  }
-
-  Future test_remove_type_argument() async {
-    await analyze('''
-class C {}
-C? c;
-''');
-    var typeArgument = findNode.namedType('double');
-    var changes = checkPlan(planner!.removeNode(typeArgument), '''
-class C {}
-C? c;
-''');
-    expect(changes.keys, [typeArgument.offset]);
-  }
-
-  Future test_remove_type_parameter() async {
-    await analyze('class C {}');
-    var parameter = findNode.typeParameter('U');
-    var changes = checkPlan(planner!.removeNode(parameter), 'class C {}');
-    expect(changes.keys, [parameter.offset]);
-  }
-
-  Future test_remove_variable_declaration() async {
-    await analyze('int? x, y, z;');
-    var declaration = findNode.variableDeclaration('y');
-    var changes = checkPlan(planner!.removeNode(declaration), 'int? x, z;');
-    expect(changes.keys, [declaration.offset]);
-  }
-
-  Future
-      test_removeNullAwarenessFromMethodInvocation_change_arguments() async {
-    await analyze('f(x) => x?.m(0);');
-    var methodInvocation = findNode.methodInvocation('?.');
-    checkPlan(
-        planner!.passThrough(methodInvocation, innerPlans: [
-          planner!.removeNullAwareness(methodInvocation),
-          planner!.passThrough(methodInvocation.argumentList, innerPlans: [
-            planner!
-                .replace(findNode.integerLiteral('0'), [AtomicEdit.insert('1')])
-          ])
-        ]),
-        'f(x) => x.m(1);');
-  }
-
-  Future
-      test_removeNullAwarenessFromMethodInvocation_change_methodName() async {
-    await analyze('f(x) => x?.m();');
-    var methodInvocation = findNode.methodInvocation('?.');
-    checkPlan(
-        planner!.passThrough(methodInvocation, innerPlans: [
-          planner!.removeNullAwareness(methodInvocation),
-          planner!.replace(findNode.simple('m'), [AtomicEdit.insert('n')])
-        ]),
-        'f(x) => x.n();');
-  }
-
-  Future
-      test_removeNullAwarenessFromMethodInvocation_change_target() async {
-    await analyze('f(x) => x?.m();');
-    var methodInvocation = findNode.methodInvocation('?.');
-    checkPlan(
-        planner!.passThrough(methodInvocation, innerPlans: [
-          planner!.replace(findNode.simple('x?.'), [AtomicEdit.insert('y')]),
-          planner!.removeNullAwareness(methodInvocation)
-        ]),
-        'f(x) => y.m();');
-  }
-
-  Future
-      test_removeNullAwarenessFromMethodInvocation_change_typeArguments() async {
-    await analyze('f(x) => x?.m();');
-    var methodInvocation = findNode.methodInvocation('?.');
-    checkPlan(
-        planner!.passThrough(methodInvocation, innerPlans: [
-          planner!.removeNullAwareness(methodInvocation),
-          planner!.passThrough(methodInvocation.typeArguments, innerPlans: [
-            planner!
-                .replace(findNode.namedType('int'), [AtomicEdit.insert('num')])
-          ])
-        ]),
-        'f(x) => x.m();');
-  }
-
-  Future test_removeNullAwarenessFromMethodInvocation_simple() async {
-    await analyze('f(x) => x?.m();');
-    var methodInvocation = findNode.methodInvocation('?.');
-    checkPlan(
-        planner!.passThrough(methodInvocation,
-            innerPlans: [planner!.removeNullAwareness(methodInvocation)]),
-        'f(x) => x.m();');
-  }
-
-  Future test_removeNullAwarenessFromPropertyAccess_change_both() async {
-    await analyze('f(x) => x?.y;');
-    var propertyAccess = findNode.propertyAccess('?.');
-    checkPlan(
-        planner!.passThrough(propertyAccess, innerPlans: [
-          planner!.replace(findNode.simple('x?.'), [AtomicEdit.insert('z')]),
-          planner!.removeNullAwareness(propertyAccess),
-          planner!.replace(findNode.simple('y'), [AtomicEdit.insert('w')])
-        ]),
-        'f(x) => z.w;');
-  }
-
-  Future
-      test_removeNullAwarenessFromPropertyAccess_change_propertyName() async {
-    await analyze('f(x) => x?.y;');
-    var propertyAccess = findNode.propertyAccess('?.');
-    checkPlan(
-        planner!.passThrough(propertyAccess, innerPlans: [
-          planner!.removeNullAwareness(propertyAccess),
-          planner!.replace(findNode.simple('y'), [AtomicEdit.insert('w')])
-        ]),
-        'f(x) => x.w;');
-  }
-
-  Future
-      test_removeNullAwarenessFromPropertyAccess_change_target() async {
-    await analyze('f(x) => x?.y;');
-    var propertyAccess = findNode.propertyAccess('?.');
-    checkPlan(
-        planner!.passThrough(propertyAccess, innerPlans: [
-          planner!.replace(findNode.simple('x?.'), [AtomicEdit.insert('z')]),
-          planner!.removeNullAwareness(propertyAccess)
-        ]),
-        'f(x) => z.y;');
-  }
-
-  Future test_removeNullAwarenessFromPropertyAccess_simple() async {
-    await analyze('f(x) => x?.y;');
-    var propertyAccess = findNode.propertyAccess('?.');
-    checkPlan(
-        planner!.passThrough(propertyAccess,
-            innerPlans: [planner!.removeNullAwareness(propertyAccess)]),
-        'f(x) => x.y;');
-  }
-
-  Future test_replace_expression() async {
-    await analyze('var x = 1 + 2 * 3;');
-    checkPlan(planner!.replace(findNode.binary('*'), [AtomicEdit.insert('6')]),
-        'var x = 1 + 6;');
-  }
-
-  Future test_replace_expression_add_parens_due_to_cascade() async {
-    await analyze('var x = 1 + 2 * 3;');
-    checkPlan(
-        planner!.replace(findNode.binary('*'), [AtomicEdit.insert('4..isEven')],
-            endsInCascade: true),
-        'var x = 1 + (4..isEven);');
-  }
-
-  Future test_replace_expression_add_parens_due_to_precedence() async {
-    await analyze('var x = 1 + 2 * 3;');
-    checkPlan(
-        planner!.replace(findNode.binary('*'), [AtomicEdit.insert('y = z')],
-            precedence: Precedence.assignment),
-        'var x = 1 + (y = z);');
-  }
-
-  Future test_replaceToken() async {
-    await analyze('var x = 1;');
-    var variableDeclarationList = findNode.variableDeclarationList('var x');
-    checkPlan(
-        planner!.replaceToken(
-            variableDeclarationList, variableDeclarationList.keyword!, 'int'),
-        'int x = 1;');
-  }
-
-  Future test_surround_allowCascade() async {
-    await analyze('f(x) => 1..isEven;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.cascade('..')),
-            prefix: [AtomicEdit.insert('x..y = ')]),
-        'f(x) => x..y = (1..isEven);');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.cascade('..')),
-            prefix: [AtomicEdit.insert('x = ')], allowCascade: true),
-        'f(x) => x = 1..isEven;');
-  }
-
-  Future test_surround_associative() async {
-    await analyze('var x = 1 - 2;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.binary('-')),
-            suffix: [AtomicEdit.insert(' - 3')],
-            innerPrecedence: Precedence.additive,
-            associative: true),
-        'var x = 1 - 2 - 3;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.binary('-')),
-            prefix: [AtomicEdit.insert('0 - ')],
-            innerPrecedence: Precedence.additive),
-        'var x = 0 - (1 - 2);');
-  }
-
-  Future test_surround_endsInCascade() async {
-    await analyze('f(x) => x..y = 1;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.integerLiteral('1')),
-            suffix: [AtomicEdit.insert(' + 2')]),
-        'f(x) => x..y = 1 + 2;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.integerLiteral('1')),
-            suffix: [AtomicEdit.insert('..isEven')], endsInCascade: true),
-        'f(x) => x..y = (1..isEven);');
-  }
-
-  Future
-      test_surround_endsInCascade_does_not_propagate_through_added_parens() async {
-    await analyze('f(a) => a..b = 0;');
-    checkPlan(
-        planner!.surround(
-            planner!.surround(planner!.passThrough(findNode.cascade('..')),
-                prefix: [AtomicEdit.insert('1 + ')],
-                innerPrecedence: Precedence.additive),
-            prefix: [AtomicEdit.insert('true ? ')],
-            suffix: [AtomicEdit.insert(' : 2')]),
-        'f(a) => true ? 1 + (a..b = 0) : 2;');
-    checkPlan(
-        planner!.surround(
-            planner!.surround(planner!.passThrough(findNode.cascade('..')),
-                prefix: [AtomicEdit.insert('throw ')], allowCascade: true),
-            prefix: [AtomicEdit.insert('true ? ')],
-            suffix: [AtomicEdit.insert(' : 2')]),
-        'f(a) => true ? (throw a..b = 0) : 2;');
-  }
-
-  Future test_surround_endsInCascade_internal_throw() async {
-    await analyze('f(x, g) => g(0, throw x, 1);');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.simple('x, 1')),
-            suffix: [AtomicEdit.insert('..y')], endsInCascade: true),
-        'f(x, g) => g(0, throw x..y, 1);');
-  }
-
-  Future test_surround_endsInCascade_propagates() async {
-    await analyze('f(a) => a..b = 0;');
-    checkPlan(
-        planner!.surround(
-            planner!.surround(planner!.passThrough(findNode.cascade('..')),
-                prefix: [AtomicEdit.insert('throw ')], allowCascade: true),
-            prefix: [AtomicEdit.insert('true ? ')],
-            suffix: [AtomicEdit.insert(' : 2')]),
-        'f(a) => true ? (throw a..b = 0) : 2;');
-    checkPlan(
-        planner!.surround(
-            planner!.surround(
-                planner!.passThrough(findNode.integerLiteral('0')),
-                prefix: [AtomicEdit.insert('throw ')],
-                allowCascade: true),
-            prefix: [AtomicEdit.insert('true ? ')],
-            suffix: [AtomicEdit.insert(' : 2')]),
-        'f(a) => a..b = true ? throw 0 : 2;');
-  }
-
-  Future test_surround_precedence() async {
-    await analyze('var x = 1 == true;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.integerLiteral('1')),
-            suffix: [AtomicEdit.insert(' < 2')],
-            outerPrecedence: Precedence.relational),
-        'var x = 1 < 2 == true;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.integerLiteral('1')),
-            suffix: [AtomicEdit.insert(' == 2')],
-            outerPrecedence: Precedence.equality),
-        'var x = (1 == 2) == true;');
-  }
-
-  Future test_surround_prefix() async {
-    await analyze('var x = 1;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.integerLiteral('1')),
-            prefix: [AtomicEdit.insert('throw ')]),
-        'var x = throw 1;');
-  }
-
-  Future test_surround_suffix() async {
-    await analyze('var x = 1;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.integerLiteral('1')),
-            suffix: [AtomicEdit.insert('..isEven')]),
-        'var x = 1..isEven;');
-  }
-
-  Future test_surround_suffix_parenthesized() async {
-    await analyze('var x = (1);');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.integerLiteral('1')),
-            suffix: [AtomicEdit.insert('..isEven')]),
-        'var x = 1..isEven;');
-  }
-
-  Future test_surround_suffix_parenthesized_passThrough_unit() async {
-    await analyze('var x = (1);');
-    checkPlan(
-        planner!.passThrough(testUnit, innerPlans: [
-          planner!.surround(planner!.passThrough(findNode.integerLiteral('1')),
-              suffix: [AtomicEdit.insert('..isEven')])
-        ]),
-        'var x = 1..isEven;');
-  }
-
-  Future test_surround_threshold() async {
-    await analyze('var x = 1 < 2;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.binary('<')),
-            suffix: [AtomicEdit.insert(' == true')],
-            innerPrecedence: Precedence.equality),
-        'var x = 1 < 2 == true;');
-    checkPlan(
-        planner!.surround(planner!.passThrough(findNode.binary('<')),
-            suffix: [AtomicEdit.insert(' as bool')],
-            innerPrecedence: Precedence.relational),
-        'var x = (1 < 2) as bool;');
-  }
-}
-
-@reflectiveTest
-class EndsInCascadeTest extends AbstractSingleUnitTest {
-  Future test_ignore_subexpression_not_at_end() async {
-    await resolveTestUnit('f(g) => g(0..isEven, 1);');
-    expect(findNode.functionExpressionInvocation('g(').endsInCascade, false);
-    expect(findNode.cascade('..').endsInCascade, true);
-  }
-
-  Future test_no_cascade() async {
-    await resolveTestUnit('var x = 0;');
-    expect(findNode.integerLiteral('0').endsInCascade, false);
-  }
-
-  Future test_stop_searching_when_parens_encountered() async {
-    await resolveTestUnit('f(x) => x = (x = 0..isEven);');
-    expect(findNode.assignment('= (x').endsInCascade, false);
-    expect(findNode.parenthesized('(x =').endsInCascade, false);
-    expect(findNode.assignment('= 0').endsInCascade, true);
-    expect(findNode.cascade('..').endsInCascade, true);
-  }
-}
-
-/// Tests of the precedence logic underlying [EditPlan].
-///
-/// The way these tests operate is as follows: we have several short snippets of
-/// Dart code exercising Dart syntax with no unnecessary parentheses.  We
-/// recursively visit the AST of each snippet and use [EditPlanner.passThrough]
-/// to create an edit plan based on each AST node.  Then we use
-/// [EditPlanner.parensNeededFromContext] to check whether parentheses are
-/// needed around each node, and assert that the result agrees with the set of
-/// parentheses that are actually present.
-@reflectiveTest
-class PrecedenceTest extends AbstractSingleUnitTest {
-  Future checkPrecedence(String content) async {
-    await resolveTestUnit(content);
-    testUnit!.accept(_PrecedenceChecker(testUnit!.lineInfo, testCode));
-  }
-
-  Future test_precedence_as() async {
-    await checkPrecedence('''
-f(a) => (a as num) as int;
-g(a, b) => a | b as int;
-''');
-  }
-
-  Future test_precedence_assignment() async {
-    await checkPrecedence('f(a, b, c) => a = b = c;');
-  }
-
-  Future test_precedence_assignment_in_cascade_with_parens() async {
-    await checkPrecedence('f(a, c, e) => a..b = (c..d = e);');
-  }
-
-  Future test_precedence_await() async {
-    await checkPrecedence('''
-f(a) async => await -a;
-g(a, b) async => await (a*b);
-    ''');
-  }
-
-  Future test_precedence_binary_equality() async {
-    await checkPrecedence('''
-f(a, b, c) => (a == b) == c;
-g(a, b, c) => a == (b == c);
-''');
-  }
-
-  Future test_precedence_binary_left_associative() async {
-    // Associativity logic is the same for all operators except relational and
-    // equality, so we just test `+` as a stand-in for all the others.
-    await checkPrecedence('''
-f(a, b, c) => a + b + c;
-g(a, b, c) => a + (b + c);
-''');
-  }
-
-  Future test_precedence_binary_relational() async {
-    await checkPrecedence('''
-f(a, b, c) => (a < b) < c;
-g(a, b, c) => a < (b < c);
-''');
-  }
-
-  Future test_precedence_conditional() async {
-    await checkPrecedence('''
-g(a, b, c, d, e, f) => a ?? b ? c = d : e = f;
-h(a, b, c, d, e) => (a ? b : c) ? d : e;
-''');
-  }
-
-  Future test_precedence_extension_override() async {
-    await checkPrecedence('''
-extension E on Object {
-  void f() {}
-}
-void g(x) => E(x).f();
-''');
-  }
-
-  Future test_precedence_functionExpression_ifNotNull() async {
-    await checkPrecedence('f(b, c) => ((a) => b) ?? c;');
-  }
-
-  Future test_precedence_functionExpressionInvocation() async {
-    await checkPrecedence('''
-f(g) => g[0](1);
-h(x) => (x + 2)(3);
-''');
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/40536')
-  Future test_precedence_ifNotNull_functionExpression() async {
-    await checkPrecedence('f(a, c) => a ?? (b) => c;');
-  }
-
-  Future test_precedence_is() async {
-    await checkPrecedence('''
-f(a) => (a as num) is int;
-g(a, b) => a | b is int;
-''');
-  }
-
-  Future test_precedence_postfix_and_index() async {
-    await checkPrecedence('''
-f(a, b, c) => a[b][c];
-g(a, b) => a[b]++;
-h(a, b) => (-a)[b];
-''');
-  }
-
-  Future test_precedence_prefix() async {
-    await checkPrecedence('''
-f(a) => ~-a;
-g(a, b) => -(a*b);
-''');
-  }
-
-  Future test_precedence_prefixedIdentifier() async {
-    await checkPrecedence('f(a) => a.b;');
-  }
-
-  Future test_precedence_propertyAccess() async {
-    await checkPrecedence('''
-f(a) => a?.b?.c;
-g(a) => (-a)?.b;
-''');
-  }
-
-  Future test_precedence_throw() async {
-    await checkPrecedence('''
-f(a, b) => throw a = b;
-g(a, c) => a..b = throw (c..d);
-''');
-  }
-
-  Future test_precedenceChecker_detects_unnecessary_paren() async {
-    await resolveTestUnit('var x = (1);');
-    expect(
-        () =>
-            testUnit!.accept(_PrecedenceChecker(testUnit!.lineInfo, testCode)),
-        throwsA(TypeMatcher()));
-  }
-}
-
-class _MockInfo implements AtomicEditInfo {
-  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
-}
-
-class _PrecedenceChecker extends UnifyingAstVisitor {
-  final EditPlanner planner;
-
-  _PrecedenceChecker(LineInfo? lineInfo, String? sourceText)
-      : planner = EditPlanner(lineInfo, sourceText);
-
-  @override
-  void visitNode(AstNode node) {
-    expect(planner.passThrough(node).parensNeededFromContext(null), false);
-    node.visitChildren(this);
-  }
-
-  @override
-  void visitParenthesizedExpression(ParenthesizedExpression node) {
-    expect(planner.passThrough(node).parensNeededFromContext(null), true);
-    node.expression.visitChildren(this);
-  }
-}
diff --git a/pkg/nnbd_migration/test/edit_planner_pass_through_merging_test.dart b/pkg/nnbd_migration/test/edit_planner_pass_through_merging_test.dart
deleted file mode 100644
index 37bb09ba4a6a..000000000000
--- a/pkg/nnbd_migration/test/edit_planner_pass_through_merging_test.dart
+++ /dev/null
@@ -1,115 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/source/line_info.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'abstract_single_unit.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(PassThroughMergingTest);
-  });
-}
-
-/// Tests to make sure the algorithm used by [EditPlaner.passThrough] is
-/// correct.
-@reflectiveTest
-class PassThroughMergingTest extends AbstractSingleUnitTest {
-  Future test_creates_pass_through_plans_stepwise() async {
-    await resolveTestUnit('var x = [[[1]]];');
-    var plan = _EditPlannerForTesting(testCode!).passThrough(
-        findNode.listLiteral('[[['),
-        innerPlans: [_MockPlan(findNode.integerLiteral('1'))]);
-    expect(plan.toString(),
-        'plan([[[1]]], [plan([[1]], [plan([1], [plan(1)])])])');
-  }
-
-  Future test_merge_plans_at_lower_level() async {
-    await resolveTestUnit('var x = [[1, 2]];');
-    var plan = _EditPlannerForTesting(testCode!)
-        .passThrough(findNode.listLiteral('[['), innerPlans: [
-      _MockPlan(findNode.integerLiteral('1')),
-      _MockPlan(findNode.integerLiteral('2'))
-    ]);
-    expect(
-        plan.toString(), 'plan([[1, 2]], [plan([1, 2], [plan(1), plan(2)])])');
-  }
-
-  Future test_merge_plans_at_top_level() async {
-    await resolveTestUnit('var x = [[1], [2]];');
-    var plan = _EditPlannerForTesting(testCode!)
-        .passThrough(findNode.listLiteral('[['), innerPlans: [
-      _MockPlan(findNode.integerLiteral('1')),
-      _MockPlan(findNode.integerLiteral('2'))
-    ]);
-    expect(plan.toString(),
-        'plan([[1], [2]], [plan([1], [plan(1)]), plan([2], [plan(2)])])');
-  }
-
-  Future test_merge_plans_at_varying_levels() async {
-    await resolveTestUnit('var x = [1, [2, 3], 4];');
-    var plan = _EditPlannerForTesting(testCode!)
-        .passThrough(findNode.listLiteral('[1'), innerPlans: [
-      _MockPlan(findNode.integerLiteral('1')),
-      _MockPlan(findNode.integerLiteral('2')),
-      _MockPlan(findNode.integerLiteral('3')),
-      _MockPlan(findNode.integerLiteral('4'))
-    ]);
-    expect(
-        plan.toString(),
-        'plan([1, [2, 3], 4], [plan(1), plan([2, 3], [plan(2), plan(3)]), '
-        'plan(4)])');
-  }
-}
-
-class _EditPlannerForTesting extends EditPlanner {
-  _EditPlannerForTesting(String content)
-      : super(LineInfo.fromContent(content), content);
-
-  @override
-  PassThroughBuilder createPassThroughBuilder(AstNode? node) =>
-      _MockPassThroughBuilder(node);
-}
-
-class _MockPassThroughBuilder implements PassThroughBuilder {
-  final List _innerPlans = [];
-
-  @override
-  final AstNode? node;
-
-  _MockPassThroughBuilder(this.node);
-
-  @override
-  void add(EditPlan innerPlan) {
-    _innerPlans.add(innerPlan);
-  }
-
-  @override
-  NodeProducingEditPlan finish(EditPlanner planner) {
-    return _MockPlan(node, _innerPlans);
-  }
-}
-
-class _MockPlan implements NodeProducingEditPlan {
-  final AstNode? _node;
-
-  final List _innerPlans;
-
-  _MockPlan(this._node, [List innerPlans = const []])
-      : _innerPlans = innerPlans;
-
-  @override
-  AstNode? get parentNode => _node!.parent;
-
-  @override
-  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
-
-  @override
-  String toString() =>
-      _innerPlans.isEmpty ? 'plan($_node)' : 'plan($_node, $_innerPlans)';
-}
diff --git a/pkg/nnbd_migration/test/fix_aggregator_test.dart b/pkg/nnbd_migration/test/fix_aggregator_test.dart
deleted file mode 100644
index 8c4279d6f5e5..000000000000
--- a/pkg/nnbd_migration/test/fix_aggregator_test.dart
+++ /dev/null
@@ -1,2149 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/nullability_suffix.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:analyzer/src/dart/element/type_provider.dart';
-import 'package:analyzer/src/generated/utilities_dart.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/fix_aggregator.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:nnbd_migration/src/nullability_node_target.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'abstract_single_unit.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(FixAggregatorTest);
-  });
-}
-
-@reflectiveTest
-class FixAggregatorTest extends FixAggregatorTestBase {
-  TypeProviderImpl get nnbdTypeProvider =>
-      (testAnalysisResult.typeProvider as TypeProviderImpl)
-          .asNonNullableByDefault;
-
-  Future test_addImport_after_library() async {
-    await analyze('''
-library foo;
-
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('package:collection/collection.dart', 'IterableExtension')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-library foo;
-
-import 'package:collection/collection.dart' show IterableExtension;
-
-main() {}
-''');
-  }
-
-  Future test_addImport_after_library_before_other() async {
-    addPackageFile('fixnum', 'fixnum.dart', '');
-    await analyze('''
-library foo;
-
-import 'package:fixnum/fixnum.dart';
-
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('package:collection/collection.dart', 'IterableExtension')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-library foo;
-
-import 'package:collection/collection.dart' show IterableExtension;
-import 'package:fixnum/fixnum.dart';
-
-main() {}
-''');
-  }
-
-  Future test_addImport_atEnd_multiple() async {
-    addPackageFile('args', 'args.dart', '');
-    await analyze('''
-import 'package:args/args.dart';
-
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('package:fixnum/fixnum.dart', 'Int32')
-        ..addImport('package:collection/collection.dart', 'IterableExtension')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:args/args.dart';
-import 'package:collection/collection.dart' show IterableExtension;
-import 'package:fixnum/fixnum.dart' show Int32;
-
-main() {}
-''');
-  }
-
-  Future test_addImport_atStart_multiple() async {
-    addPackageFile('fixnum', 'fixnum.dart', '');
-    await analyze('''
-import 'package:fixnum/fixnum.dart';
-
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('package:collection/collection.dart', 'IterableExtension')
-        ..addImport('package:args/args.dart', 'ArgParser')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:args/args.dart' show ArgParser;
-import 'package:collection/collection.dart' show IterableExtension;
-import 'package:fixnum/fixnum.dart';
-
-main() {}
-''');
-  }
-
-  Future test_addImport_before_export() async {
-    await analyze('''
-export 'dart:async';
-
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('package:collection/collection.dart', 'IterableExtension')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:collection/collection.dart' show IterableExtension;
-export 'dart:async';
-
-main() {}
-''');
-  }
-
-  Future test_addImport_no_previous_imports_multiple() async {
-    await analyze('''
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('dart:async', 'Future')
-        ..addImport('dart:math', 'sin')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'dart:async' show Future;
-import 'dart:math' show sin;
-
-main() {}
-''');
-  }
-
-  Future test_addImport_recursive() async {
-    addPackageFile('args', 'args.dart', '');
-    addPackageFile('fixnum', 'fixnum.dart', 'class Int32 {}');
-    await analyze('''
-import 'package:args/args.dart';
-import 'package:fixnum/fixnum.dart' show Int32;
-
-main() => null;
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('package:collection/collection.dart', 'IterableExtension'),
-      findNode.import('package:fixnum').combinators[0]:
-          NodeChangeForShowCombinator()..addName('Int64'),
-      findNode.expression('null'): NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:args/args.dart';
-import 'package:collection/collection.dart' show IterableExtension;
-import 'package:fixnum/fixnum.dart' show Int32, Int64;
-
-main() => null!;
-''');
-  }
-
-  Future test_addImport_sort_shown_names() async {
-    await analyze('''
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('dart:async', 'Stream')
-        ..addImport('dart:async', 'Future')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'dart:async' show Future, Stream;
-
-main() {}
-''');
-  }
-
-  Future test_addImport_sorted() async {
-    addPackageFile('args', 'args.dart', '');
-    addPackageFile('fixnum', 'fixnum.dart', '');
-    await analyze('''
-import 'package:args/args.dart';
-import 'package:fixnum/fixnum.dart';
-
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('package:collection/collection.dart', 'IterableExtension')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:args/args.dart';
-import 'package:collection/collection.dart' show IterableExtension;
-import 'package:fixnum/fixnum.dart';
-
-main() {}
-''');
-  }
-
-  Future test_addImport_sorted_multiple() async {
-    addPackageFile('collection', 'collection.dart', '');
-    await analyze('''
-import 'package:collection/collection.dart';
-
-main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..addImport('package:fixnum/fixnum.dart', 'Int32')
-        ..addImport('package:args/args.dart', 'ArgParser')
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:args/args.dart' show ArgParser;
-import 'package:collection/collection.dart';
-import 'package:fixnum/fixnum.dart' show Int32;
-
-main() {}
-''');
-  }
-
-  Future test_addRequired() async {
-    await analyze('f({int x}) => 0;');
-    var previewInfo = run({
-      findNode.defaultParameter('int x'): NodeChangeForDefaultFormalParameter()
-        ..addRequiredKeyword = true
-    })!;
-    expect(previewInfo.applyTo(code!), 'f({required int x}) => 0;');
-  }
-
-  Future test_addRequired_afterMetadata() async {
-    await analyze('f({@deprecated int x}) => 0;');
-    var previewInfo = run({
-      findNode.defaultParameter('int x'): NodeChangeForDefaultFormalParameter()
-        ..addRequiredKeyword = true
-    })!;
-    expect(previewInfo.applyTo(code!), 'f({@deprecated required int x}) => 0;');
-  }
-
-  Future test_addRequired_afterMetadata_andRequiredAnnotation() async {
-    addMetaPackage();
-    var content = '''
-import 'package:meta/meta.dart';
-f({@required @deprecated int x}) {}
-''';
-    await analyze(content);
-    var annotation = findNode.annotation('required');
-    var previewInfo = run({
-      findNode.defaultParameter('int x'): NodeChangeForDefaultFormalParameter()
-        ..addRequiredKeyword = true
-        ..annotationToRemove = annotation
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:meta/meta.dart';
-f({@deprecated required int x}) {}
-''');
-    expect(previewInfo.values, hasLength(2));
-
-    expect(previewInfo[content.indexOf('int ')], hasLength(1));
-    expect(previewInfo[content.indexOf('int ')]!.single.isInsertion, true);
-    expect(previewInfo[content.indexOf('@required')], isNotNull);
-    expect(previewInfo[content.indexOf('@required')]!.single.isDeletion, true);
-  }
-
-  Future test_addRequired_afterMetadata_beforeFinal() async {
-    await analyze('f({@deprecated final int x}) => 0;');
-    var previewInfo = run({
-      findNode.defaultParameter('int x'): NodeChangeForDefaultFormalParameter()
-        ..addRequiredKeyword = true
-    })!;
-    expect(previewInfo.applyTo(code!),
-        'f({@deprecated required final int x}) => 0;');
-  }
-
-  Future test_addRequired_afterMetadata_beforeFunctionTyped() async {
-    await analyze('f({@deprecated int x()}) => 0;');
-    var previewInfo = run({
-      findNode.defaultParameter('int x'): NodeChangeForDefaultFormalParameter()
-        ..addRequiredKeyword = true
-    })!;
-    expect(
-        previewInfo.applyTo(code!), 'f({@deprecated required int x()}) => 0;');
-  }
-
-  Future test_addShownName_atEnd_multiple() async {
-    await analyze("import 'dart:math' show cos;");
-    var previewInfo = run({
-      findNode.import('dart:math').combinators[0]: NodeChangeForShowCombinator()
-        ..addName('tan')
-        ..addName('sin')
-    })!;
-    expect(
-        previewInfo.applyTo(code!), "import 'dart:math' show cos, sin, tan;");
-  }
-
-  Future test_addShownName_atStart_multiple() async {
-    await analyze("import 'dart:math' show tan;");
-    var previewInfo = run({
-      findNode.import('dart:math').combinators[0]: NodeChangeForShowCombinator()
-        ..addName('sin')
-        ..addName('cos')
-    })!;
-    expect(
-        previewInfo.applyTo(code!), "import 'dart:math' show cos, sin, tan;");
-  }
-
-  Future test_addShownName_sorted() async {
-    await analyze("import 'dart:math' show cos, tan;");
-    var previewInfo = run({
-      findNode.import('dart:math').combinators[0]: NodeChangeForShowCombinator()
-        ..addName('sin')
-    })!;
-    expect(
-        previewInfo.applyTo(code!), "import 'dart:math' show cos, sin, tan;");
-  }
-
-  Future test_addShownName_sorted_multiple() async {
-    await analyze("import 'dart:math' show sin;");
-    var previewInfo = run({
-      findNode.import('dart:math').combinators[0]: NodeChangeForShowCombinator()
-        ..addName('tan')
-        ..addName('cos')
-    })!;
-    expect(
-        previewInfo.applyTo(code!), "import 'dart:math' show cos, sin, tan;");
-  }
-
-  Future test_adjacentFixes() async {
-    await analyze('f(a, b) => a + b;');
-    var aRef = findNode.simple('a +');
-    var bRef = findNode.simple('b;');
-    var previewInfo = run({
-      aRef: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo()),
-      bRef: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo()),
-      findNode.binary('a + b'): NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(a, b) => (a! + b!)!;');
-  }
-
-  Future test_argument_list_drop_all_arguments() async {
-    var content = '''
-f([int x, int y]) => null;
-g(int x, int y) => f(x, y);
-''';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.methodInvocation('f(x').argumentList: NodeChangeForArgumentList()
-        ..dropArgument(findNode.simple('y);'), null)
-        ..dropArgument(findNode.simple('x, y'), null)
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-f([int x, int y]) => null;
-g(int x, int y) => f();
-''');
-  }
-
-  Future test_argument_list_drop_one_argument() async {
-    var content = '''
-f([int x, int y]) => null;
-g(int x, int y) => f(x, y);
-''';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.methodInvocation('f(x').argumentList: NodeChangeForArgumentList()
-        ..dropArgument(findNode.simple('y);'), null)
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-f([int x, int y]) => null;
-g(int x, int y) => f(x);
-''');
-  }
-
-  Future test_argument_list_recursive_changes() async {
-    var content = '''
-f([int x, int y]) => null;
-g(int x, int y) => f(x, y);
-''';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.methodInvocation('f(x').argumentList: NodeChangeForArgumentList()
-        ..dropArgument(findNode.simple('y);'), null),
-      findNode.simple('x, y'): NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-f([int x, int y]) => null;
-g(int x, int y) => f(x!);
-''');
-  }
-
-  Future test_assignment_add_null_check() async {
-    var content = 'f(int x, int y) => x += y;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.assignment('+='): NodeChangeForAssignment()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(int x, int y) => (x += y)!;');
-  }
-
-  Future test_assignment_change_lhs() async {
-    var content = 'f(List x, int y) => x[0] += y;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.assignment('+='): NodeChangeForAssignment(),
-      findNode.index('[0]').target: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(List x, int y) => x![0] += y;');
-  }
-
-  Future test_assignment_change_rhs() async {
-    var content = 'f(int x, int y) => x += y;';
-    await analyze(content);
-    var assignment = findNode.assignment('+=');
-    var previewInfo = run({
-      assignment: NodeChangeForAssignment(),
-      assignment.rightHandSide: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(int x, int y) => x += y!;');
-  }
-
-  Future test_assignment_compound_with_bad_combined_type() async {
-    var content = 'f(int x, int y) => x += y;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.assignment('+='): NodeChangeForAssignment()
-        ..hasBadCombinedType = true
-    })!;
-    expect(previewInfo.applyTo(code!), content);
-    expect(previewInfo, hasLength(1));
-    var edit = previewInfo[content.indexOf('+=')]!.single;
-    expect(edit.info!.description,
-        NullabilityFixDescription.compoundAssignmentHasBadCombinedType);
-    expect(edit.isInformative, isTrue);
-    expect(edit.length, '+='.length);
-  }
-
-  Future test_assignment_compound_with_nullable_source() async {
-    var content = 'f(int x, int y) => x += y;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.assignment('+='): NodeChangeForAssignment()
-        ..hasNullableSource = true
-    })!;
-    expect(previewInfo.applyTo(code!), content);
-    expect(previewInfo, hasLength(1));
-    var edit = previewInfo[content.indexOf('+=')]!.single;
-    expect(edit.info!.description,
-        NullabilityFixDescription.compoundAssignmentHasNullableSource);
-    expect(edit.isInformative, isTrue);
-    expect(edit.length, '+='.length);
-  }
-
-  Future test_assignment_introduce_as() async {
-    var content = 'f(int x, int y) => x += y;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.assignment('+='): NodeChangeForAssignment()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.intType, isDowncast: false),
-            null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(int x, int y) => (x += y) as int;');
-  }
-
-  Future test_assignment_weak_null_aware() async {
-    var content = 'f(int x, int y) => x ??= y;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.assignment('??='): NodeChangeForAssignment()
-        ..isWeakNullAware = true
-    }, warnOnWeakCode: true)!;
-    expect(previewInfo.applyTo(code!), content);
-    expect(previewInfo, hasLength(1));
-    var edit = previewInfo[content.indexOf('??=')]!.single;
-    expect(edit.info!.description,
-        NullabilityFixDescription.nullAwareAssignmentUnnecessaryInStrongMode);
-    expect(edit.isInformative, isTrue);
-    expect(edit.length, '??='.length);
-  }
-
-  Future test_assignment_weak_null_aware_remove() async {
-    var content = 'f(int x, int y) => x ??= y;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.assignment('??='): NodeChangeForAssignment()
-        ..isWeakNullAware = true
-    }, warnOnWeakCode: false)!;
-    expect(previewInfo.applyTo(code!), 'f(int x, int y) => x;');
-  }
-
-  Future test_eliminateDeadIf_changesInKeptCode() async {
-    await analyze('''
-f(int i, int/*?*/ j) {
-  if (i != null) j.isEven;
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = true,
-      findNode.simple('j.isEven'): NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-f(int i, int/*?*/ j) {
-  j!.isEven;
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_changesInKeptCode_expandBlock() async {
-    await analyze('''
-f(int i, int/*?*/ j) {
-  if (i != null) {
-    j.isEven;
-  }
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = true,
-      findNode.simple('j.isEven'): NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-f(int i, int/*?*/ j) {
-  j!.isEven;
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_element_delete_drop_completely() async {
-    await analyze('''
-List f(int i) {
-  return [if (i == null) null];
-}
-''');
-    var previewInfo = run({
-      findNode.ifElement('=='): NodeChangeForIfElement()..conditionValue = false
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-List f(int i) {
-  return [];
-}
-''');
-  }
-
-  Future
-      test_eliminateDeadIf_element_delete_drop_completely_not_in_sequence() async {
-    await analyze('''
-List f(int i) {
-  return [for (var x in [1, 2, 3]) if (i == null) null];
-}
-''');
-    var previewInfo = run({
-      findNode.ifElement('=='): NodeChangeForIfElement()..conditionValue = false
-    })!;
-    // This is a little kludgy; we could drop the `for` loop, but it's difficult
-    // to do so, and this is a rare enough corner case that it doesn't seem
-    // worth it.  Replacing the `if` with `...{}` has the right effect, since
-    // it expands to nothing.
-    expect(previewInfo.applyTo(code!), '''
-List f(int i) {
-  return [for (var x in [1, 2, 3]) ...{}];
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_element_delete_keep_else() async {
-    await analyze('''
-List f(int i) {
-  return [if (i == null) null else i + 1];
-}
-''');
-    var previewInfo = run({
-      findNode.ifElement('=='): NodeChangeForIfElement()..conditionValue = false
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-List f(int i) {
-  return [i + 1];
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_element_delete_keep_then() async {
-    await analyze('''
-List f(int i) {
-  return [if (i == null) null else i + 1];
-}
-''');
-    var previewInfo = run({
-      findNode.ifElement('=='): NodeChangeForIfElement()..conditionValue = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-List f(int i) {
-  return [null];
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_expression_delete_keep_else() async {
-    await analyze('''
-int f(int i) {
-  return i == null ? null : i + 1;
-}
-''');
-    var previewInfo = run({
-      findNode.conditionalExpression('=='): NodeChangeForConditionalExpression()
-        ..conditionValue = false
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-int f(int i) {
-  return i + 1;
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_expression_delete_keep_then() async {
-    await analyze('''
-int f(int i) {
-  return i == null ? null : i + 1;
-}
-''');
-    var previewInfo = run({
-      findNode.conditionalExpression('=='): NodeChangeForConditionalExpression()
-        ..conditionValue = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-int f(int i) {
-  return null;
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_statement_comment_keep_else() async {
-    await analyze('''
-int f(int i) {
-  if (i == null) {
-    return null;
-  } else {
-    return i + 1;
-  }
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = false
-    }, removeViaComments: true)!;
-    expect(previewInfo.applyTo(code!), '''
-int f(int i) {
-  /* if (i == null) {
-    return null;
-  } else {
-    */ return i + 1; /*
-  } */
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_statement_comment_keep_then() async {
-    await analyze('''
-int f(int i) {
-  if (i == null) {
-    return null;
-  } else {
-    return i + 1;
-  }
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = true
-    }, removeViaComments: true)!;
-    expect(previewInfo.applyTo(code!), '''
-int f(int i) {
-  /* if (i == null) {
-    */ return null; /*
-  } else {
-    return i + 1;
-  } */
-}
-''');
-  }
-
-  Future
-      test_eliminateDeadIf_statement_delete_drop_completely_false() async {
-    await analyze('''
-void f(int i) {
-  if (i == null) {
-    print('null');
-  }
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = false
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-void f(int i) {}
-''');
-  }
-
-  Future
-      test_eliminateDeadIf_statement_delete_drop_completely_not_in_block() async {
-    await analyze('''
-void f(int i) {
-  while (true)
-    if (i == null) {
-      print('null');
-    }
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = false
-    })!;
-    // Note: formatting is a little weird here but it's such a rare case that
-    // we don't care.
-    expect(previewInfo.applyTo(code!), '''
-void f(int i) {
-  while (true)
-    {}
-}
-''');
-  }
-
-  Future
-      test_eliminateDeadIf_statement_delete_drop_completely_true() async {
-    await analyze('''
-void f(int i) {
-  if (i != null) {} else {
-    print('null');
-  }
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-void f(int i) {}
-''');
-  }
-
-  Future test_eliminateDeadIf_statement_delete_keep_else() async {
-    await analyze('''
-int f(int i) {
-  if (i == null) {
-    return null;
-  } else {
-    return i + 1;
-  }
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = false
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-int f(int i) {
-  return i + 1;
-}
-''');
-  }
-
-  Future test_eliminateDeadIf_statement_delete_keep_then() async {
-    await analyze('''
-int f(int i) {
-  if (i != null) {
-    return i + 1;
-  } else {
-    return null;
-  }
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-int f(int i) {
-  return i + 1;
-}
-''');
-  }
-
-  Future
-      test_eliminateDeadIf_statement_delete_keep_then_declaration() async {
-    await analyze('''
-void f(int i, String callback()) {
-  if (i != null) {
-    var i = callback();
-  } else {
-    return;
-  }
-  print(i);
-}
-''');
-    // In this case we have to keep the block so that the scope of `var i`
-    // doesn't widen.
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-void f(int i, String callback()) {
-  {
-    var i = callback();
-  }
-  print(i);
-}
-''');
-  }
-
-  Future test_introduceAs_distant_parens_no_longer_needed() async {
-    // Note: in principle it would be nice to delete the outer parens, but it's
-    // difficult to see that they used to be necessary and aren't anymore, so we
-    // leave them.
-    await analyze('f(a, c) => a..b = (throw c..d);');
-    var cd = findNode.cascade('c..d');
-    var previewInfo = run({
-      cd: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.intType, isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(
-        previewInfo.applyTo(code!), 'f(a, c) => a..b = (throw (c..d) as int);');
-  }
-
-  Future test_introduceAs_dynamic() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.dynamicType, isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(Object o) => o as dynamic;');
-  }
-
-  Future test_introduceAs_favorPrefix() async {
-    await analyze('''
-import 'dart:async' as a;
-import 'dart:async';
-f(Object o) => o;
-''');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.futureNullType,
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'dart:async' as a;
-import 'dart:async';
-f(Object o) => o as a.Future;
-''');
-  }
-
-  Future test_introduceAs_functionType() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [],
-                    parameters: [],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(Object o) => o as bool Function();');
-  }
-
-  Future test_introduceAs_functionType_formal_bound() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [
-                      TypeParameterElementImpl.synthetic('T')
-                        ..bound = nnbdTypeProvider.numType
-                    ],
-                    parameters: [],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!),
-        'f(Object o) => o as bool Function();');
-  }
-
-  Future test_introduceAs_functionType_formal_bound_dynamic() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [
-                      TypeParameterElementImpl.synthetic('T')
-                        ..bound = nnbdTypeProvider.dynamicType
-                    ],
-                    parameters: [],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(
-        previewInfo.applyTo(code!), 'f(Object o) => o as bool Function();');
-  }
-
-  Future test_introduceAs_functionType_formal_bound_object() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [
-                      TypeParameterElementImpl.synthetic('T')
-                        ..bound = nnbdTypeProvider.objectType
-                    ],
-                    parameters: [],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!),
-        'f(Object o) => o as bool Function();');
-  }
-
-  Future
-      test_introduceAs_functionType_formal_bound_object_question() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [
-                      TypeParameterElementImpl.synthetic('T')
-                        ..bound = (nnbdTypeProvider.objectType as TypeImpl)
-                            .withNullability(NullabilitySuffix.question)
-                    ],
-                    parameters: [],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(
-        previewInfo.applyTo(code!), 'f(Object o) => o as bool Function();');
-  }
-
-  Future test_introduceAs_functionType_formal_bound_question() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [
-                      TypeParameterElementImpl.synthetic('T')
-                        ..bound = (nnbdTypeProvider.numType as TypeImpl)
-                            .withNullability(NullabilitySuffix.question)
-                    ],
-                    parameters: [],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!),
-        'f(Object o) => o as bool Function();');
-  }
-
-  Future test_introduceAs_functionType_formals() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [
-                      TypeParameterElementImpl.synthetic('T'),
-                      TypeParameterElementImpl.synthetic('U')
-                    ],
-                    parameters: [],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!),
-        'f(Object o) => o as bool Function();');
-  }
-
-  Future test_introduceAs_functionType_parameters() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [],
-                    parameters: [
-                      ParameterElementImpl.synthetic('x',
-                          nnbdTypeProvider.intType, ParameterKind.REQUIRED),
-                      ParameterElementImpl.synthetic(
-                          'y', nnbdTypeProvider.numType, ParameterKind.REQUIRED)
-                    ],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!),
-        'f(Object o) => o as bool Function(int, num);');
-  }
-
-  Future test_introduceAs_functionType_parameters_named() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [],
-                    parameters: [
-                      ParameterElementImpl.synthetic(
-                          'x', nnbdTypeProvider.intType, ParameterKind.NAMED),
-                      ParameterElementImpl.synthetic(
-                          'y', nnbdTypeProvider.numType, ParameterKind.NAMED)
-                    ],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!),
-        'f(Object o) => o as bool Function({int x, num y});');
-  }
-
-  Future test_introduceAs_functionType_parameters_optional() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                FunctionTypeImpl(
-                    returnType: nnbdTypeProvider.boolType,
-                    typeFormals: [],
-                    parameters: [
-                      ParameterElementImpl.synthetic('x',
-                          nnbdTypeProvider.intType, ParameterKind.POSITIONAL),
-                      ParameterElementImpl.synthetic('y',
-                          nnbdTypeProvider.numType, ParameterKind.POSITIONAL)
-                    ],
-                    nullabilitySuffix: NullabilitySuffix.none),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!),
-        'f(Object o) => o as bool Function([int, num]);');
-  }
-
-  Future test_introduceAs_interfaceType_parameterized() async {
-    await analyze('f(Object o) => o;');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(
-                nnbdTypeProvider.mapType(
-                    nnbdTypeProvider.intType, nnbdTypeProvider.boolType),
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(Object o) => o as Map;');
-  }
-
-  Future test_introduceAs_no_parens() async {
-    await analyze('f(a, b) => a | b;');
-    var expr = findNode.binary('a | b');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.intType, isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(a, b) => a | b as int;');
-  }
-
-  Future test_introduceAs_parens() async {
-    await analyze('f(a, b) => a < b;');
-    var expr = findNode.binary('a < b');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.boolType, isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(a, b) => (a < b) as bool;');
-  }
-
-  Future test_introduceAs_usePrefix() async {
-    await analyze('''
-import 'dart:async' as a;
-f(Object o) => o;
-''');
-    var expr = findNode.simple('o;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.futureNullType,
-                isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'dart:async' as a;
-f(Object o) => o as a.Future;
-''');
-  }
-
-  Future test_introduceAs_withNullCheck() async {
-    await analyze('f(x) => x;');
-    var expr = findNode.simple('x;');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.intType, isDowncast: false),
-            _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(x) => x! as int;');
-  }
-
-  Future test_keep_redundant_parens() async {
-    await analyze('f(a, b, c) => a + (b * c);');
-    var previewInfo = run({});
-    expect(previewInfo, isEmpty);
-  }
-
-  Future test_makeNullable() async {
-    await analyze('f(int x) {}');
-    var typeName = findNode.namedType('int');
-    var previewInfo = run({
-      typeName: NodeChangeForTypeAnnotation()
-        ..recordNullability(
-            MockDecoratedType(
-                MockDartType(toStringValueWithoutNullability: 'int')),
-            true)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(int? x) {}');
-  }
-
-  Future test_methodName_change() async {
-    await analyze('f() => f();');
-    var previewInfo = run({
-      findNode.methodInvocation('f();').methodName: NodeChangeForMethodName()
-        ..replaceWith('g', null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f() => g();');
-  }
-
-  Future test_methodName_no_change() async {
-    await analyze('f() => f();');
-    var previewInfo = run({
-      findNode.methodInvocation('f();').methodName: NodeChangeForMethodName()
-    });
-    expect(previewInfo, isNull);
-  }
-
-  Future test_noChangeToTypeAnnotation() async {
-    await analyze('int x = 0;');
-    var typeName = findNode.namedType('int');
-    var previewInfo = run({
-      typeName: NodeChangeForTypeAnnotation()
-        ..recordNullability(
-            MockDecoratedType(
-                MockDartType(toStringValueWithoutNullability: 'int')),
-            false)
-    })!;
-    expect(previewInfo.applyTo(code!), 'int x = 0;');
-    expect(previewInfo.applyTo(code!, includeInformative: true), 'int  x = 0;');
-    expect(previewInfo.values.single.single.info!.description.appliedMessage,
-        "Type 'int' was not made nullable");
-  }
-
-  Future test_noInfoForTypeAnnotation() async {
-    await analyze('int x = 0;');
-    var typeName = findNode.namedType('int');
-    var previewInfo = run({typeName: NodeChangeForTypeAnnotation()});
-    expect(previewInfo, null);
-  }
-
-  Future test_noValidMigration() async {
-    await analyze('f(a) => null;');
-    var literal = findNode.nullLiteral('null');
-    var previewInfo = run({
-      literal: NodeChangeForExpression()
-        ..addExpressionChange(
-            NoValidMigrationChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), code);
-    expect(previewInfo.applyTo(code!, includeInformative: true),
-        'f(a) => null /* no valid migration */;');
-  }
-
-  Future test_nullCheck_index_cascadeResult() async {
-    await analyze('f(a) => a..[0].c;');
-    var index = findNode.index('[0]');
-    var previewInfo = run({
-      index: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(a) => a..[0]!.c;');
-  }
-
-  Future test_nullCheck_methodInvocation_cascadeResult() async {
-    await analyze('f(a) => a..b().c;');
-    var method = findNode.methodInvocation('b()');
-    var previewInfo = run({
-      method: NodeChangeForMethodInvocation()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(a) => a..b()!.c;');
-  }
-
-  Future test_nullCheck_no_parens() async {
-    await analyze('f(a) => a++;');
-    var expr = findNode.postfix('a++');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(a) => a++!;');
-  }
-
-  Future test_nullCheck_parens() async {
-    await analyze('f(a) => -a;');
-    var expr = findNode.prefix('-a');
-    var previewInfo = run({
-      expr: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(a) => (-a)!;');
-  }
-
-  Future test_nullCheck_propertyAccess_cascadeResult() async {
-    await analyze('f(a) => a..b.c;');
-    var property = findNode.propertyAccess('b');
-    var previewInfo = run({
-      property: NodeChangeForPropertyAccess()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(a) => a..b!.c;');
-  }
-
-  Future test_parameter_addExplicitType_annotated() async {
-    await analyze('f({@deprecated x = 0}) {}');
-    var previewInfo = run({
-      findNode.simpleParameter('x'): NodeChangeForSimpleFormalParameter()
-        ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), 'f({@deprecated int x = 0}) {}');
-  }
-
-  Future test_parameter_addExplicitType_declared_with_covariant() async {
-    await analyze('''
-class C {
-  m({num x}) {}
-}
-class D extends C {
-  m({covariant x = 3}) {}
-}
-''');
-    var previewInfo = run({
-      findNode.simpleParameter('x = 3'): NodeChangeForSimpleFormalParameter()
-        ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-class C {
-  m({num x}) {}
-}
-class D extends C {
-  m({covariant int x = 3}) {}
-}
-''');
-  }
-
-  Future test_parameter_addExplicitType_declared_with_final() async {
-    await analyze('f({final x = 0}) {}');
-    var previewInfo = run({
-      findNode.simpleParameter('x'): NodeChangeForSimpleFormalParameter()
-        ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), 'f({final int x = 0}) {}');
-  }
-
-  Future test_parameter_addExplicitType_declared_with_var() async {
-    await analyze('f({var x = 0}) {}');
-    var previewInfo = run({
-      findNode.simpleParameter('x'): NodeChangeForSimpleFormalParameter()
-        ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), 'f({int x = 0}) {}');
-  }
-
-  Future test_parameter_addExplicitType_named() async {
-    await analyze('f({x = 0}) {}');
-    var previewInfo = run({
-      findNode.simpleParameter('x'): NodeChangeForSimpleFormalParameter()
-        ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), 'f({int x = 0}) {}');
-  }
-
-  Future test_parameter_addExplicitType_no() async {
-    await analyze('f([x = 0]) {}');
-    var previewInfo = run(
-        {findNode.simpleParameter('x'): NodeChangeForSimpleFormalParameter()});
-    expect(previewInfo, isNull);
-  }
-
-  Future test_parameter_addExplicitType_optional_insert() async {
-    await analyze('f([x = 0]) {}');
-    var previewInfo = run({
-      findNode.simpleParameter('x'): NodeChangeForSimpleFormalParameter()
-        ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), 'f([int x = 0]) {}');
-  }
-
-  Future test_parameter_addExplicitType_prefixed_type() async {
-    await analyze('''
-import 'dart:core' as core;
-f({x = 0}) {}
-''');
-    var previewInfo = run({
-      findNode.simpleParameter('x'): NodeChangeForSimpleFormalParameter()
-        ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'dart:core' as core;
-f({core.int x = 0}) {}
-''');
-  }
-
-  Future test_parameter_field_formal_addExplicitType() async {
-    await analyze('''
-class C {
-  int x;
-  C(this.x) {}
-}
-''');
-    var previewInfo = run({
-      findNode.fieldFormalParameter('this.x'):
-          NodeChangeForFieldFormalParameter()
-            ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-class C {
-  int x;
-  C(int this.x) {}
-}
-''');
-  }
-
-  Future
-      test_parameter_field_formal_addExplicitType_declared_with_final() async {
-    verifyNoTestUnitErrors = false;
-    await analyze('''
-class C {
-  int x;
-  C(final this.x) {}
-}
-''');
-    var previewInfo = run({
-      findNode.fieldFormalParameter('this.x'):
-          NodeChangeForFieldFormalParameter()
-            ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-class C {
-  int x;
-  C(final int this.x) {}
-}
-''');
-  }
-
-  Future
-      test_parameter_field_formal_addExplicitType_declared_with_var() async {
-    await analyze('''
-class C {
-  int x;
-  C(var this.x) {}
-}
-''');
-    var previewInfo = run({
-      findNode.fieldFormalParameter('this.x'):
-          NodeChangeForFieldFormalParameter()
-            ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-class C {
-  int x;
-  C(int this.x) {}
-}
-''');
-  }
-
-  Future test_parameter_field_formal_addExplicitType_no() async {
-    await analyze('''
-class C {
-  int x;
-  C(this.x) {}
-}
-''');
-    var previewInfo = run({
-      findNode.fieldFormalParameter('this.x'):
-          NodeChangeForFieldFormalParameter()
-    });
-    expect(previewInfo, isNull);
-  }
-
-  Future test_post_increment_add_null_check() async {
-    var content = 'f(int x) => x++;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.postfix('++'): NodeChangeForPostfixExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(int x) => x++!;');
-  }
-
-  Future test_post_increment_change_target() async {
-    var content = 'f(List x) => x[0]++;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.postfix('++'): NodeChangeForPostfixExpression(),
-      findNode.index('[0]').target: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(List x) => x![0]++;');
-  }
-
-  Future test_post_increment_introduce_as() async {
-    var content = 'f(int x) => x++;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.postfix('++'): NodeChangeForPostfixExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.intType, isDowncast: false),
-            null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(int x) => x++ as int;');
-  }
-
-  Future test_post_increment_with_bad_combined_type() async {
-    var content = 'f(int x) => x++;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.postfix('++'): NodeChangeForPostfixExpression()
-        ..hasBadCombinedType = true
-    })!;
-    expect(previewInfo.applyTo(code!), content);
-    expect(previewInfo, hasLength(1));
-    var edit = previewInfo[content.indexOf('++')]!.single;
-    expect(edit.info!.description,
-        NullabilityFixDescription.compoundAssignmentHasBadCombinedType);
-    expect(edit.isInformative, isTrue);
-    expect(edit.length, '++'.length);
-  }
-
-  Future test_post_increment_with_nullable_source() async {
-    var content = 'f(int x) => x++;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.postfix('++'): NodeChangeForPostfixExpression()
-        ..hasNullableSource = true
-    })!;
-    expect(previewInfo.applyTo(code!), content);
-    expect(previewInfo, hasLength(1));
-    var edit = previewInfo[content.indexOf('++')]!.single;
-    expect(edit.info!.description,
-        NullabilityFixDescription.compoundAssignmentHasNullableSource);
-    expect(edit.isInformative, isTrue);
-    expect(edit.length, '++'.length);
-  }
-
-  Future test_pre_increment_add_null_check() async {
-    var content = 'f(int x) => ++x;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.prefix('++'): NodeChangeForPrefixExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(int x) => (++x)!;');
-  }
-
-  Future test_pre_increment_change_target() async {
-    var content = 'f(List x) => ++x[0];';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.prefix('++'): NodeChangeForPrefixExpression(),
-      findNode.index('[0]').target: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(List x) => ++x![0];');
-  }
-
-  Future test_pre_increment_introduce_as() async {
-    var content = 'f(int x) => ++x;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.prefix('++'): NodeChangeForPrefixExpression()
-        ..addExpressionChange(
-            IntroduceAsChange(nnbdTypeProvider.intType, isDowncast: false),
-            null)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(int x) => ++x as int;');
-  }
-
-  Future test_pre_increment_with_bad_combined_type() async {
-    var content = 'f(int x) => ++x;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.prefix('++'): NodeChangeForPrefixExpression()
-        ..hasBadCombinedType = true
-    })!;
-    expect(previewInfo.applyTo(code!), content);
-    expect(previewInfo, hasLength(1));
-    var edit = previewInfo[content.indexOf('++')]!.single;
-    expect(edit.info!.description,
-        NullabilityFixDescription.compoundAssignmentHasBadCombinedType);
-    expect(edit.isInformative, isTrue);
-    expect(edit.length, '++'.length);
-  }
-
-  Future test_pre_increment_with_nullable_source() async {
-    var content = 'f(int x) => ++x;';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.prefix('++'): NodeChangeForPrefixExpression()
-        ..hasNullableSource = true
-    })!;
-    expect(previewInfo.applyTo(code!), content);
-    expect(previewInfo, hasLength(1));
-    var edit = previewInfo[content.indexOf('++')]!.single;
-    expect(edit.info!.description,
-        NullabilityFixDescription.compoundAssignmentHasNullableSource);
-    expect(edit.isInformative, isTrue);
-    expect(edit.length, '++'.length);
-  }
-
-  Future
-      test_removeAs_in_cascade_target_no_parens_needed_cascade() async {
-    await analyze('f(a) => ((a..b) as dynamic)..c;');
-    var cascade = findNode.cascade('a..b');
-    var cast = cascade.parent!.parent;
-    var previewInfo =
-        run({cast: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a) => a..b..c;');
-  }
-
-  Future
-      test_removeAs_in_cascade_target_no_parens_needed_conditional() async {
-    // TODO(paulberry): would it be better to keep the parens in this case for
-    // clarity, even though they're not needed?
-    await analyze('f(a, b, c) => ((a ? b : c) as dynamic)..d;');
-    var conditional = findNode.conditionalExpression('a ? b : c');
-    var cast = conditional.parent!.parent;
-    var previewInfo =
-        run({cast: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b, c) => a ? b : c..d;');
-  }
-
-  Future
-      test_removeAs_in_cascade_target_parens_needed_assignment() async {
-    await analyze('f(a, b) => ((a = b) as dynamic)..c;');
-    var assignment = findNode.assignment('a = b');
-    var cast = assignment.parent!.parent;
-    var previewInfo =
-        run({cast: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b) => (a = b)..c;');
-  }
-
-  Future test_removeAs_in_cascade_target_parens_needed_throw() async {
-    await analyze('f(a) => ((throw a) as dynamic)..b;');
-    var throw_ = findNode.throw_('throw a');
-    var cast = throw_.parent!.parent;
-    var previewInfo =
-        run({cast: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a) => (throw a)..b;');
-  }
-
-  Future
-      test_removeAs_lower_precedence_do_not_remove_inner_parens() async {
-    await analyze('f(a, b, c) => (a == b) as Null == c;');
-    var expr = findNode.binary('a == b');
-    var previewInfo = run(
-        {expr.parent!.parent: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b, c) => (a == b) == c;');
-  }
-
-  Future test_removeAs_lower_precedence_remove_inner_parens() async {
-    await analyze('f(a, b) => (a == b) as Null;');
-    var expr = findNode.binary('a == b');
-    var previewInfo = run(
-        {expr.parent!.parent: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b) => a == b;');
-  }
-
-  Future test_removeAs_parens_needed_due_to_cascade() async {
-    // Note: parens are needed, and they could either be around `c..d` or around
-    // `throw c..d`.  In an ideal world, we would see that we can just keep the
-    // parens we have, but this is difficult because we don't see that the
-    // parens are needed until we walk far enough up the AST to see that we're
-    // inside a cascade expression.  So we drop the parens and then create new
-    // ones surrounding `throw c..d`.
-    //
-    // Strictly speaking the code we produce is correct, it's just making a
-    // slightly larger edit than necessary.  This is presumably a really rare
-    // corner case so for now we're not worrying about it.
-    await analyze('f(a, c) => a..b = throw (c..d) as int;');
-    var cd = findNode.cascade('c..d');
-    var cast = cd.parent!.parent;
-    var previewInfo =
-        run({cast: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, c) => a..b = (throw c..d);');
-  }
-
-  Future
-      test_removeAs_parens_needed_due_to_cascade_in_conditional_else() async {
-    await analyze('f(a, b, c) => a ? b : (c..d) as int;');
-    var cd = findNode.cascade('c..d');
-    var cast = cd.parent!.parent;
-    var previewInfo =
-        run({cast: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b, c) => a ? b : (c..d);');
-  }
-
-  Future
-      test_removeAs_parens_needed_due_to_cascade_in_conditional_then() async {
-    await analyze('f(a, b, d) => a ? (b..c) as int : d;');
-    var bc = findNode.cascade('b..c');
-    var cast = bc.parent!.parent;
-    var previewInfo =
-        run({cast: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b, d) => a ? (b..c) : d;');
-  }
-
-  Future test_removeAs_raise_precedence_do_not_remove_parens() async {
-    await analyze('f(a, b, c) => a | (b | c as int);');
-    var expr = findNode.binary('b | c');
-    var previewInfo =
-        run({expr.parent: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b, c) => a | (b | c);');
-  }
-
-  Future test_removeAs_raise_precedence_no_parens_to_remove() async {
-    await analyze('f(a, b, c) => a = b | c as int;');
-    var expr = findNode.binary('b | c');
-    var previewInfo =
-        run({expr.parent: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b, c) => a = b | c;');
-  }
-
-  Future test_removeAs_raise_precedence_remove_parens() async {
-    await analyze('f(a, b, c) => a < (b | c as int);');
-    var expr = findNode.binary('b | c');
-    var previewInfo =
-        run({expr.parent: NodeChangeForAsExpression()..removeAs = true})!;
-    expect(previewInfo.applyTo(code!), 'f(a, b, c) => a < b | c;');
-  }
-
-  Future test_removeLanguageVersion() async {
-    await analyze('''
-// ignore: illegal_language_version_override
-//@dart=2.6
-void main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..removeLanguageVersionComment = true
-    })!;
-    // TODO(mfairhurst): Remove beginning \n once it renders properly in preview
-    expect(previewInfo.applyTo(code!), '''
-// ignore: illegal_language_version_override
-
-void main() {}
-''');
-  }
-
-  Future test_removeLanguageVersion_after_license() async {
-    await analyze('''
-// Some licensing stuff here...
-// Some copyrighting stuff too...
-// etc...
-// ignore: illegal_language_version_override
-// @dart = 2.6
-void main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..removeLanguageVersionComment = true
-    })!;
-    // TODO(mfairhurst): Remove beginning \n once it renders properly in preview
-    expect(previewInfo.applyTo(code!), '''
-// Some licensing stuff here...
-// Some copyrighting stuff too...
-// etc...
-// ignore: illegal_language_version_override
-
-void main() {}
-''');
-  }
-
-  Future test_removeLanguageVersion_spaces() async {
-    await analyze('''
-// ignore: illegal_language_version_override
-// @dart = 2.6
-void main() {}
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..removeLanguageVersionComment = true
-    })!;
-    // TODO(mfairhurst): Remove beginning \n once it renders properly in preview
-    expect(previewInfo.applyTo(code!), '''
-// ignore: illegal_language_version_override
-
-void main() {}
-''');
-  }
-
-  Future test_removeLanguageVersion_withOtherChanges() async {
-    await analyze('''
-// ignore: illegal_language_version_override
-//@dart=2.6
-int f() => null;
-''');
-    var previewInfo = run({
-      findNode.unit: NodeChangeForCompilationUnit()
-        ..removeLanguageVersionComment = true,
-      findNode.typeAnnotation('int'): NodeChangeForTypeAnnotation()
-        ..recordNullability(
-            MockDecoratedType(
-                MockDartType(toStringValueWithoutNullability: 'int')),
-            true)
-    })!;
-    // TODO(mfairhurst): Remove beginning \n once it renders properly in preview
-    expect(previewInfo.applyTo(code!), '''
-// ignore: illegal_language_version_override
-
-int? f() => null;
-''');
-  }
-
-  Future test_removeNullAwarenessFromMethodInvocation() async {
-    await analyze('f(x) => x?.m();');
-    var methodInvocation = findNode.methodInvocation('?.');
-    var previewInfo = run({
-      methodInvocation: NodeChangeForMethodInvocation()
-        ..nullAwarenessRemoval = NullAwarenessRemovalType.strong
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(x) => x.m();');
-  }
-
-  Future
-      test_removeNullAwarenessFromMethodInvocation_changeArgument() async {
-    await analyze('f(x) => x?.m(x);');
-    var methodInvocation = findNode.methodInvocation('?.');
-    var argument = findNode.simple('x);');
-    var previewInfo = run({
-      methodInvocation: NodeChangeForMethodInvocation()
-        ..nullAwarenessRemoval = NullAwarenessRemovalType.strong,
-      argument: NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(x) => x.m(x!);');
-  }
-
-  Future
-      test_removeNullAwarenessFromMethodInvocation_changeTarget() async {
-    await analyze('f(x) => (x as dynamic)?.m();');
-    var methodInvocation = findNode.methodInvocation('?.');
-    var cast = findNode.as_('as');
-    var previewInfo = run({
-      methodInvocation: NodeChangeForMethodInvocation()
-        ..nullAwarenessRemoval = NullAwarenessRemovalType.strong,
-      cast: NodeChangeForAsExpression()..removeAs = true
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(x) => x.m();');
-  }
-
-  Future
-      test_removeNullAwarenessFromMethodInvocation_changeTypeArgument() async {
-    await analyze('f(x) => x?.m();');
-    var methodInvocation = findNode.methodInvocation('?.');
-    var typeAnnotation = findNode.typeAnnotation('int');
-    var previewInfo = run({
-      methodInvocation: NodeChangeForMethodInvocation()
-        ..nullAwarenessRemoval = NullAwarenessRemovalType.strong,
-      typeAnnotation: NodeChangeForTypeAnnotation()
-        ..recordNullability(
-            MockDecoratedType(
-                MockDartType(toStringValueWithoutNullability: 'int')),
-            true)
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(x) => x.m();');
-  }
-
-  Future test_removeNullAwarenessFromPropertyAccess() async {
-    await analyze('f(x) => x?.y;');
-    var propertyAccess = findNode.propertyAccess('?.');
-    var previewInfo = run({
-      propertyAccess: NodeChangeForPropertyAccess()
-        ..nullAwarenessRemoval = NullAwarenessRemovalType.strong
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(x) => x.y;');
-  }
-
-  Future test_removeNullAwarenessFromPropertyAccess_changeTarget() async {
-    await analyze('f(x) => (x as dynamic)?.y;');
-    var propertyAccess = findNode.propertyAccess('?.');
-    var cast = findNode.as_('as');
-    var previewInfo = run({
-      propertyAccess: NodeChangeForPropertyAccess()
-        ..nullAwarenessRemoval = NullAwarenessRemovalType.strong,
-      cast: NodeChangeForAsExpression()..removeAs = true
-    })!;
-    expect(previewInfo.applyTo(code!), 'f(x) => x.y;');
-  }
-
-  Future
-      test_requiredAnnotationToRequiredKeyword_leadingAnnotations() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-f({@deprecated @required int x}) {}
-''');
-    var annotation = findNode.annotation('required');
-    var previewInfo = run({
-      annotation: NodeChangeForAnnotation()..changeToRequiredKeyword = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:meta/meta.dart';
-f({@deprecated required int x}) {}
-''');
-    expect(previewInfo.values.single.single.isDeletion, true);
-  }
-
-  Future test_requiredAnnotationToRequiredKeyword_prefixed() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart' as meta;
-f({@meta.required int x}) {}
-''');
-    var annotation = findNode.annotation('required');
-    var previewInfo = run({
-      annotation: NodeChangeForAnnotation()..changeToRequiredKeyword = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:meta/meta.dart' as meta;
-f({required int x}) {}
-''');
-    expect(previewInfo.values.single.single.isDeletion, true);
-  }
-
-  Future test_requiredAnnotationToRequiredKeyword_renamed() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-const foo = required;
-f({@foo int x}) {}
-''');
-    var annotation = findNode.annotation('@foo');
-    var previewInfo = run({
-      annotation: NodeChangeForAnnotation()..changeToRequiredKeyword = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:meta/meta.dart';
-const foo = required;
-f({required int x}) {}
-''');
-  }
-
-  Future test_requiredAnnotationToRequiredKeyword_simple() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-f({@required int x}) {}
-''');
-    var annotation = findNode.annotation('required');
-    var previewInfo = run({
-      annotation: NodeChangeForAnnotation()..changeToRequiredKeyword = true
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:meta/meta.dart';
-f({required int x}) {}
-''');
-    expect(previewInfo.values.single.single.isDeletion, true);
-  }
-
-  Future
-      test_requiredAnnotationToRequiredKeyword_simple_removeViaComment() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-f({@required int x}) {}
-''');
-    var annotation = findNode.annotation('required');
-    var previewInfo = run(
-        {annotation: NodeChangeForAnnotation()..changeToRequiredKeyword = true},
-        removeViaComments: true)!;
-    expect(previewInfo.applyTo(code!), '''
-import 'package:meta/meta.dart';
-f({required int x}) {}
-''');
-    expect(previewInfo.values.single.single.isDeletion, true);
-  }
-
-  Future test_variableDeclarationList_addExplicitType_insert() async {
-    await analyze('final x = 0;');
-    var previewInfo = run({
-      findNode.variableDeclarationList('final'):
-          NodeChangeForVariableDeclarationList()
-            ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), 'final int x = 0;');
-  }
-
-  Future test_variableDeclarationList_addExplicitType_metadata() async {
-    await analyze('@deprecated var x = 0;');
-    var previewInfo = run({
-      findNode.variableDeclarationList('var'):
-          NodeChangeForVariableDeclarationList()
-            ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), '@deprecated int x = 0;');
-  }
-
-  Future test_variableDeclarationList_addExplicitType_no() async {
-    await analyze('var x = 0;');
-    var previewInfo = run({
-      findNode.variableDeclarationList('var'):
-          NodeChangeForVariableDeclarationList()
-    });
-    expect(previewInfo, isNull);
-  }
-
-  Future test_variableDeclarationList_addExplicitType_otherPlans() async {
-    await analyze('var x = 0;');
-    var previewInfo = run({
-      findNode.variableDeclarationList('var'):
-          NodeChangeForVariableDeclarationList()
-            ..addExplicitType = nnbdTypeProvider.intType,
-      findNode.integerLiteral('0'): NodeChangeForExpression()
-        ..addExpressionChange(NullCheckChange(MockDartType()), _MockInfo())
-    })!;
-    expect(previewInfo.applyTo(code!), 'int x = 0!;');
-  }
-
-  Future test_variableDeclarationList_addExplicitType_prefixed() async {
-    await analyze('''
-import 'dart:core' as core;
-final x = 0;
-''');
-    var previewInfo = run({
-      findNode.variableDeclarationList('final'):
-          NodeChangeForVariableDeclarationList()
-            ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), '''
-import 'dart:core' as core;
-final core.int x = 0;
-''');
-  }
-
-  Future test_variableDeclarationList_addExplicitType_replaceVar() async {
-    await analyze('var x = 0;');
-    var previewInfo = run({
-      findNode.variableDeclarationList('var'):
-          NodeChangeForVariableDeclarationList()
-            ..addExplicitType = nnbdTypeProvider.intType
-    })!;
-    expect(previewInfo.applyTo(code!), 'int x = 0;');
-  }
-
-  Future test_warnOnDeadIf_false() async {
-    await analyze('''
-f(int i) {
-  if (i == null) print(i);
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = false
-    }, warnOnWeakCode: true)!;
-    expect(previewInfo.applyTo(code!, includeInformative: true), '''
-f(int i) {
-  if (i == null /* == false */) print(i);
-}
-''');
-  }
-
-  Future test_warnOnDeadIf_true() async {
-    await analyze('''
-f(int i) {
-  if (i != null) print(i);
-}
-''');
-    var previewInfo = run({
-      findNode.statement('if'): NodeChangeForIfStatement()
-        ..conditionValue = true
-    }, warnOnWeakCode: true)!;
-    expect(previewInfo.applyTo(code!, includeInformative: true), '''
-f(int i) {
-  if (i != null /* == true */) print(i);
-}
-''');
-  }
-
-  Future test_warnOnNullAwareAccess() async {
-    var content = '''
-f(int i) {
-  print(i?.isEven);
-}
-''';
-    await analyze(content);
-    var previewInfo = run({
-      findNode.propertyAccess('?.'): NodeChangeForPropertyAccess()
-        ..nullAwarenessRemoval = NullAwarenessRemovalType.weak
-    }, warnOnWeakCode: true)!;
-    expect(previewInfo.applyTo(code!), content);
-    expect(previewInfo, hasLength(1));
-    var edit = previewInfo[content.indexOf('?')]!.single;
-    expect(edit.isInformative, isTrue);
-    expect(edit.length, '?'.length);
-  }
-}
-
-class FixAggregatorTestBase extends AbstractSingleUnitTest {
-  String? code;
-
-  Future analyze(String code) async {
-    this.code = code;
-    await resolveTestUnit(code);
-  }
-
-  Map>? run(Map changes,
-      {bool removeViaComments = false, bool warnOnWeakCode = false}) {
-    return FixAggregator.run(testUnit!, testCode, changes,
-        removeViaComments: removeViaComments, warnOnWeakCode: warnOnWeakCode);
-  }
-}
-
-class MockDartType implements TypeImpl {
-  final String? toStringValueWithNullability;
-
-  final String? toStringValueWithoutNullability;
-
-  const MockDartType(
-      {this.toStringValueWithNullability,
-      this.toStringValueWithoutNullability});
-
-  @override
-  String getDisplayString({
-    bool skipAllDynamicArguments = false,
-    bool withNullability = false,
-  }) {
-    var result = withNullability
-        ? toStringValueWithNullability!
-        : toStringValueWithoutNullability!;
-    expect(result, isNotNull);
-    return result;
-  }
-
-  @override
-  noSuchMethod(Invocation invocation) {
-    return super.noSuchMethod(invocation);
-  }
-}
-
-class MockDecoratedType implements DecoratedType {
-  @override
-  final DartType type;
-
-  const MockDecoratedType(this.type);
-
-  @override
-  NullabilityNode get node =>
-      NullabilityNode.forTypeAnnotation(NullabilityNodeTarget.text('test'));
-
-  @override
-  noSuchMethod(Invocation invocation) {
-    return super.noSuchMethod(invocation);
-  }
-}
-
-class _MockInfo implements AtomicEditInfo {
-  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
-}
diff --git a/pkg/nnbd_migration/test/fix_builder_test.dart b/pkg/nnbd_migration/test/fix_builder_test.dart
deleted file mode 100644
index ee0a689feab8..000000000000
--- a/pkg/nnbd_migration/test/fix_builder_test.dart
+++ /dev/null
@@ -1,3948 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/error/codes.g.dart';
-import 'package:analyzer/src/generated/element_type_provider.dart';
-import 'package:nnbd_migration/fix_reason_target.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/fix_aggregator.dart';
-import 'package:nnbd_migration/src/fix_builder.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'migration_visitor_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(FixBuilderTest);
-  });
-}
-
-/// Information about the target of an assignment expression analyzed by
-/// [FixBuilder].
-class AssignmentTargetInfo {
-  /// The type that the assignment target has when read.  This is only relevant
-  /// for compound assignments (since they both read and write the assignment
-  /// target)
-  final DartType? readType;
-
-  /// The type that the assignment target has when written to.
-  final DartType? writeType;
-
-  AssignmentTargetInfo(this.readType, this.writeType);
-}
-
-@reflectiveTest
-class FixBuilderTest extends EdgeBuilderTestBase {
-  static final isAddRequiredKeyword =
-      TypeMatcher()
-          .having((c) => c.addRequiredKeyword, 'addRequiredKeyword', true);
-
-  static final isMakeNullable = TypeMatcher()
-      .having((c) => c.makeNullable, 'makeNullable', true)
-      .having((c) => c.nullabilityHint, 'nullabilityHint', isNull);
-
-  static final isMakeNullableDueToHint =
-      TypeMatcher()
-          .having((c) => c.makeNullable, 'makeNullable', true)
-          .having((c) => c.nullabilityHint, 'nullabilityHint', isNotNull);
-
-  static const isEdge = TypeMatcher();
-
-  static final isExplainNonNullable = TypeMatcher()
-      .having((c) => c.makeNullable, 'makeNullable', false);
-
-  static final isBadCombinedType = TypeMatcher()
-      .having((c) => c.hasBadCombinedType, 'hasBadCombinedType', true);
-
-  static final isNullableSource = TypeMatcher()
-      .having((c) => c.hasNullableSource, 'hasNullableSource', true);
-
-  static final isNodeChangeForExpression =
-      TypeMatcher();
-
-  static final isNoValidMigration =
-      isNodeChangeForExpression.havingNoValidMigrationWithInfo(anything);
-
-  static final isNullCheck =
-      isNodeChangeForExpression.havingNullCheckWithInfo(anything);
-
-  static final isRemoveLanguageVersion =
-      TypeMatcher().having(
-          (c) => c.removeLanguageVersionComment,
-          'removeLanguageVersionComment',
-          true);
-
-  static final isAddImportOfIterableExtension =
-      TypeMatcher()
-          .having((c) => c.addImports, 'addImports', {
-    'package:collection/collection.dart': {'IterableExtension'}
-  });
-
-  static final isAddShowOfIterableExtension =
-      TypeMatcher().having((c) => c.addNames,
-          'addNames', unorderedEquals(['IterableExtension']));
-
-  static final isRemoveNullAwareness =
-      TypeMatcher().having(
-          (c) => c.nullAwarenessRemoval != NullAwarenessRemovalType.none,
-          'removeNullAwareness',
-          true);
-
-  static final isRemoveAs = TypeMatcher()
-      .having((c) => c.removeAs, 'removeAs', true);
-
-  static final isRequiredAnnotationToRequiredKeyword =
-      TypeMatcher().having(
-          (c) => c.changeToRequiredKeyword, 'changeToRequiredKeyword', true);
-
-  static final isWeakNullAwareAssignment =
-      TypeMatcher()
-          .having((c) => c.isWeakNullAware, 'isWeakNullAware', true);
-
-  @override
-  Future analyze(String code) async {
-    var unit = await super.analyze(code);
-    graph.propagate();
-    return unit;
-  }
-
-  TypeMatcher isDropArgument(
-          dynamic argumentsToDrop) =>
-      TypeMatcher()
-          .having((c) => c.argumentsToDrop, 'argumentsToDrop', argumentsToDrop);
-
-  TypeMatcher isInfo(description, fixReasons) =>
-      TypeMatcher()
-          .having((i) => i.description, 'description', description)
-          .having((i) => i.fixReasons, 'fixReasons', fixReasons);
-
-  TypeMatcher isMethodNameChange(
-          dynamic replacement) =>
-      TypeMatcher()
-          .having((c) => c.replacement, 'replacement', replacement);
-
-  Map scopedChanges(
-          FixBuilder fixBuilder, AstNode? scope) =>
-      {
-        for (var entry in fixBuilder.changes.entries)
-          if (_isInScope(entry.key, scope) && !entry.value.isInformative)
-            entry.key: entry.value
-      };
-
-  Map scopedInformative(
-          FixBuilder fixBuilder, AstNode scope) =>
-      {
-        for (var entry in fixBuilder.changes.entries)
-          if (_isInScope(entry.key, scope) && entry.value.isInformative)
-            entry.key: entry.value
-      };
-
-  Map> scopedProblems(
-          FixBuilder fixBuilder, AstNode? scope) =>
-      {
-        for (var entry in fixBuilder.problems.entries)
-          if (_isInScope(entry.key, scope)) entry.key: entry.value
-      };
-
-  Future test_asExpression_keep() async {
-    await analyze('''
-_f(Object x) {
-  print((x as int) + 1);
-}
-''');
-    var asExpression = findNode.simple('x as').parent as Expression;
-    visitSubexpression(asExpression, 'int');
-  }
-
-  Future test_asExpression_keep_previously_unnecessary() async {
-    verifyNoTestUnitErrors = false;
-    await analyze('''
-f(int i) {
-  print((i as int) + 1);
-}
-''');
-    expect(testAnalysisResult.errors.single.errorCode,
-        WarningCode.UNNECESSARY_CAST);
-    var asExpression = findNode.simple('i as').parent as Expression;
-    visitSubexpression(asExpression, 'int');
-  }
-
-  Future test_asExpression_remove() async {
-    await analyze('''
-_f(Object x) {
-  if (x is! int) return;
-  print((x as int) + 1);
-}
-''');
-    var asExpression = findNode.simple('x as').parent as Expression;
-    visitSubexpression(asExpression, 'int',
-        changes: {asExpression: isRemoveAs});
-  }
-
-  Future
-      test_assignmentExpression_compound_combined_nullable_noProblem() async {
-    await analyze('''
-abstract class _C {
-  _D/*?*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*!*/ get x;
-  void set x(_C/*?*/ value);
-  f(int/*!*/ y) => x += y;
-}
-''');
-    visitSubexpression(findNode.assignment('+='), '_D?');
-  }
-
-  Future
-      test_assignmentExpression_compound_combined_nullable_noProblem_dynamic() async {
-    await analyze('''
-abstract class _E {
-  dynamic get x;
-  void set x(Object/*!*/ value);
-  f(int/*!*/ y) => x += y;
-}
-''');
-    var assignment = findNode.assignment('+=');
-    visitSubexpression(assignment, 'dynamic');
-  }
-
-  @FailingTest(reason: 'TODO(paulberry)')
-  Future
-      test_assignmentExpression_compound_combined_nullable_problem() async {
-    await analyze('''
-abstract class _C {
-  _D/*?*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*!*/ get x;
-  void set x(_C/*!*/ value);
-  f(int/*!*/ y) => x += y;
-}
-''');
-    var assignment = findNode.assignment('+=');
-    visitSubexpression(assignment, '_D', problems: {
-      assignment: {const CompoundAssignmentCombinedNullable()}
-    });
-  }
-
-  Future test_assignmentExpression_compound_dynamic() async {
-    // To confirm that the RHS is visited, we check that a null check was
-    // properly inserted into a subexpression of the RHS.
-    await analyze('''
-_f(dynamic x, int/*?*/ y) => x += y + 1;
-''');
-    visitSubexpression(findNode.assignment('+='), 'dynamic',
-        changes: {findNode.simple('y +'): isNullCheck});
-  }
-
-  Future test_assignmentExpression_compound_intRules() async {
-    await analyze('''
-_f(int x, int y) => x += y;
-''');
-    visitSubexpression(findNode.assignment('+='), 'int');
-  }
-
-  @FailingTest(reason: 'TODO(paulberry)')
-  Future test_assignmentExpression_compound_lhs_nullable_problem() async {
-    await analyze('''
-abstract class _C {
-  _D/*!*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*?*/ get x;
-  void set x(_C/*?*/ value);
-  f(int/*!*/ y) => x += y;
-}
-''');
-    var assignment = findNode.assignment('+=');
-    visitSubexpression(assignment, '_D', problems: {
-      assignment: {const CompoundAssignmentReadNullable()}
-    });
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/39641')
-  Future test_assignmentExpression_compound_promoted() async {
-    await analyze('''
-f(bool/*?*/ x, bool/*?*/ y) => x != null && (x = y);
-''');
-    // It is ok to assign a nullable value to `x` even though it is promoted to
-    // non-nullable, so `y` should not be null-checked.  However, the whole
-    // assignment `x = y` should be null checked because the RHS of `&&` cannot
-    // be nullable.
-    visitSubexpression(findNode.binary('&&'), 'bool',
-        changes: {findNode.parenthesized('x = y'): isNullCheck});
-  }
-
-  Future test_assignmentExpression_compound_rhs_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  _D/*!*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-_f(_C/*!*/ x, int/*!*/ y) => x += y;
-''');
-    visitSubexpression(findNode.assignment('+='), '_D');
-  }
-
-  Future test_assignmentExpression_compound_rhs_nullable_check() async {
-    await analyze('''
-abstract class _C {
-  _D/*!*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-_f(_C/*!*/ x, int/*?*/ y) => x += y;
-''');
-    visitSubexpression(findNode.assignment('+='), '_D',
-        changes: {findNode.simple('y;'): isNullCheck});
-  }
-
-  Future test_assignmentExpression_compound_rhs_nullable_noCheck() async {
-    await analyze('''
-abstract class _C {
-  _D/*!*/ operator+(int/*?*/ value);
-}
-abstract class _D extends _C {}
-_f(_C/*!*/ x, int/*?*/ y) => x += y;
-''');
-    visitSubexpression(findNode.assignment('+='), '_D');
-  }
-
-  Future
-      test_assignmentExpression_null_aware_rhs_does_not_promote() async {
-    await analyze('''
-_f(bool/*?*/ b, int/*?*/ i) {
-  b ??= i.isEven; // 1
-  b = i.isEven; // 2
-  b = i.isEven; // 3
-}
-''');
-    // The null check inserted at 1 fails to promote i because it's inside the
-    // `??=`, so a null check is inserted at 2.  This does promote i, so no null
-    // check is inserted at 3.
-    visitStatement(findNode.block('{'), changes: {
-      findNode.simple('i.isEven; // 1'): isNullCheck,
-      findNode.simple('i.isEven; // 2'): isNullCheck
-    });
-  }
-
-  Future test_assignmentExpression_null_aware_rhs_nonNullable() async {
-    await analyze('''
-abstract class _B {}
-abstract class _C extends _B {}
-abstract class _D extends _C {}
-abstract class _E extends _C {}
-abstract class _F {
-  _D/*?*/ get x;
-  void set x(_B/*?*/ value);
-  f(_E/*!*/ y) => x ??= y;
-}
-''');
-    visitSubexpression(findNode.assignment('??='), '_C');
-  }
-
-  Future test_assignmentExpression_null_aware_rhs_nullable() async {
-    await analyze('''
-abstract class _B {}
-abstract class _C extends _B {}
-abstract class _D extends _C {}
-abstract class _E extends _C {}
-abstract class _F {
-  _D/*?*/ get x;
-  void set x(_B/*?*/ value);
-  f(_E/*?*/ y) => x ??= y;
-}
-''');
-    visitSubexpression(findNode.assignment('??='), '_C?');
-  }
-
-  Future test_assignmentExpression_null_aware_simple_promoted() async {
-    await analyze('''
-_f(bool/*?*/ x, bool/*?*/ y) => x != null && (x ??= y) != null;
-''');
-    // On the RHS of the `&&`, `x` is promoted to non-nullable, but it is still
-    // considered to be a nullable assignment target, so no null check is
-    // generated for `y`.
-    visitSubexpression(findNode.binary('&&'), 'bool',
-        changes: {findNode.assignment('??='): isWeakNullAwareAssignment});
-  }
-
-  Future
-      test_assignmentExpression_simple_nonNullable_to_nonNullable() async {
-    await analyze('''
-_f(int/*!*/ x, int/*!*/ y) => x = y;
-''');
-    visitSubexpression(findNode.assignment('= '), 'int');
-  }
-
-  Future
-      test_assignmentExpression_simple_nonNullable_to_nullable() async {
-    await analyze('''
-_f(int/*?*/ x, int/*!*/ y) => x = y;
-''');
-    visitSubexpression(findNode.assignment('= '), 'int');
-  }
-
-  Future
-      test_assignmentExpression_simple_nullable_to_nonNullable() async {
-    await analyze('''
-_f(int/*!*/ x, int/*?*/ y) => x = y;
-''');
-    visitSubexpression(findNode.assignment('= '), 'int',
-        changes: {findNode.simple('y;'): isNullCheck});
-  }
-
-  Future test_assignmentExpression_simple_nullable_to_nullable() async {
-    await analyze('''
-_f(int/*?*/ x, int/*?*/ y) => x = y;
-''');
-    visitSubexpression(findNode.assignment('= '), 'int?');
-  }
-
-  Future test_assignmentExpression_simple_promoted() async {
-    await analyze('''
-_f(bool/*?*/ x, bool/*?*/ y) => x != null && (x = y) != null;
-''');
-    // On the RHS of the `&&`, `x` is promoted to non-nullable, but it is still
-    // considered to be a nullable assignment target, so no null check is
-    // generated for `y`.
-    visitSubexpression(findNode.binary('&&'), 'bool');
-  }
-
-  Future test_assignmentTarget_indexExpression_compound_dynamic() async {
-    await analyze('''
-_f(dynamic d, int/*?*/ i) => d[i] += 0;
-''');
-    visitAssignmentTarget(findNode.index('d[i]'), 'dynamic', 'dynamic');
-  }
-
-  Future test_assignmentTarget_indexExpression_compound_simple() async {
-    await analyze('''
-class _C {
-  int operator[](String s) => 1;
-  void operator[]=(String s, num n) {}
-}
-_f(_C c) => c['foo'] += 0;
-''');
-    visitAssignmentTarget(findNode.index('c['), 'int', 'num?');
-  }
-
-  Future
-      test_assignmentTarget_indexExpression_compound_simple_check_lhs() async {
-    await analyze('''
-class _C {
-  int operator[](String s) => 1;
-  void operator[]=(String s, num n) {}
-}
-_f(_C/*?*/ c) => c['foo'] += 0;
-''');
-    visitAssignmentTarget(findNode.index('c['), 'int', 'num?',
-        changes: {findNode.simple('c['): isNullCheck});
-  }
-
-  Future
-      test_assignmentTarget_indexExpression_compound_simple_check_rhs() async {
-    await analyze('''
-class _C {
-  int operator[](String/*!*/ s) => 1;
-  void operator[]=(String/*?*/ s, num n) {}
-}
-_f(_C c, String/*?*/ s) => c[s] += 0;
-''');
-    visitAssignmentTarget(findNode.index('c['), 'int', 'num?',
-        changes: {findNode.simple('s]'): isNullCheck});
-  }
-
-  Future
-      test_assignmentTarget_indexExpression_compound_substituted() async {
-    await analyze('''
-class _C {
-  T operator[](U u) => throw 'foo';
-  void operator[]=(U u, T t) {}
-}
-_f(_C c) => c['foo'] += 1;
-''');
-    visitAssignmentTarget(findNode.index('c['), 'int', 'int');
-  }
-
-  Future
-      test_assignmentTarget_indexExpression_compound_substituted_check_rhs() async {
-    await analyze('''
-class _C {
-  T operator[](U u) => throw 'foo';
-  void operator[]=(U/*?*/ u, T t) {}
-}
-_f(_C c, String/*?*/ s) => c[s] += 1;
-''');
-    visitAssignmentTarget(findNode.index('c['), 'int', 'int',
-        changes: {findNode.simple('s]'): isNullCheck});
-  }
-
-  Future
-      test_assignmentTarget_indexExpression_compound_substituted_no_check_rhs() async {
-    await analyze('''
-class _C {
-  T operator[](U u) => throw 'foo';
-  void operator[]=(U u, T t) {}
-}
-_f(_C c, String/*?*/ s) => c[s] += 0;
-''');
-    visitAssignmentTarget(findNode.index('c['), 'int', 'int');
-  }
-
-  Future test_assignmentTarget_indexExpression_dynamic() async {
-    await analyze('''
-_f(dynamic d, int/*?*/ i) => d[i] = 0;
-''');
-    visitAssignmentTarget(findNode.index('d[i]'), null, 'dynamic');
-  }
-
-  Future test_assignmentTarget_indexExpression_simple() async {
-    await analyze('''
-class _C {
-  int operator[](String s) => 1;
-  void operator[]=(String s, num n) {}
-}
-_f(_C c) => c['foo'] = 0;
-''');
-    visitAssignmentTarget(findNode.index('c['), null, 'num?');
-  }
-
-  Future test_assignmentTarget_indexExpression_simple_check_lhs() async {
-    await analyze('''
-class _C {
-  int operator[](String s) => 1;
-  void operator[]=(String s, num n) {}
-}
-_f(_C/*?*/ c) => c['foo'] = 0;
-''');
-    visitAssignmentTarget(findNode.index('c['), null, 'num?',
-        changes: {findNode.simple('c['): isNullCheck});
-  }
-
-  Future test_assignmentTarget_indexExpression_simple_check_rhs() async {
-    await analyze('''
-class _C {
-  int operator[](String/*?*/ s) => 1;
-  void operator[]=(String/*!*/ s, num n) {}
-}
-_f(_C c, String/*?*/ s) => c[s] = 0;
-''');
-    visitAssignmentTarget(findNode.index('c['), null, 'num?',
-        changes: {findNode.simple('s]'): isNullCheck});
-  }
-
-  Future test_assignmentTarget_indexExpression_substituted() async {
-    await analyze('''
-class _C {
-  T operator[](U u) => throw 'foo';
-  void operator[]=(U u, T t) {}
-}
-_f(_C c) => c['foo'] = 1;
-''');
-    visitAssignmentTarget(findNode.index('c['), null, 'int');
-  }
-
-  Future
-      test_assignmentTarget_indexExpression_substituted_check_rhs() async {
-    await analyze('''
-class _C {
-  T operator[](U u) => throw 'foo';
-  void operator[]=(U/*!*/ u, T t) {}
-}
-_f(_C c, String/*?*/ s) => c[s] = 1;
-''');
-    visitAssignmentTarget(findNode.index('c['), null, 'int',
-        changes: {findNode.simple('s]'): isNullCheck});
-  }
-
-  Future
-      test_assignmentTarget_indexExpression_substituted_no_check_rhs() async {
-    await analyze('''
-class _C {
-  T operator[](U u) => throw 'foo';
-  void operator[]=(U u, T t) {}
-}
-_f(_C c, String/*?*/ s) => c[s] = 0;
-''');
-    visitAssignmentTarget(findNode.index('c['), null, 'int');
-  }
-
-  Future test_assignmentTarget_prefixedIdentifier_dynamic() async {
-    await analyze('''
-Object/*!*/ _f(dynamic d) => d.x += 1;
-''');
-    visitAssignmentTarget(findNode.prefixed('d.x'), 'dynamic', 'dynamic');
-  }
-
-  Future test_assignmentTarget_propertyAccess_dynamic() async {
-    await analyze('''
-_f(dynamic d) => (d).x += 1;
-''');
-    visitAssignmentTarget(
-        findNode.propertyAccess('(d).x'), 'dynamic', 'dynamic');
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_dynamic_notCompound() async {
-    await analyze('''
-_f(dynamic d) => (d).x = 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('(d).x'), null, 'dynamic');
-  }
-
-  Future test_assignmentTarget_propertyAccess_field_nonNullable() async {
-    await analyze('''
-class _C {
-  int/*!*/ x = 0;
-}
-_f(_C c) => (c).x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('(c).x'), 'int', 'int');
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_field_nonNullable_notCompound() async {
-    await analyze('''
-class _C {
-  int/*!*/ x = 0;
-}
-_f(_C c) => (c).x = 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('(c).x'), null, 'int');
-  }
-
-  Future test_assignmentTarget_propertyAccess_field_nullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ x = 0;
-}
-_f(_C c) => (c).x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('(c).x'), 'int?', 'int?');
-  }
-
-  Future test_assignmentTarget_propertyAccess_getter_nullable() async {
-    await analyze('''
-abstract class _C {
-  int/*?*/ get x;
-  void set x(num/*?*/ value);
-}
-_f(_C c) => (c).x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('(c).x'), 'int?', 'num?');
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_getter_setter_check_lhs() async {
-    await analyze('''
-abstract class _C {
-  int get x;
-  void set x(num value);
-}
-_f(_C/*?*/ c) => (c).x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('(c).x'), 'int', 'num',
-        changes: {findNode.parenthesized('(c).x'): isNullCheck});
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_getter_setter_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  int/*!*/ get x;
-  void set x(num/*!*/ value);
-}
-_f(_C c) => (c).x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('(c).x'), 'int', 'num');
-  }
-
-  Future test_assignmentTarget_propertyAccess_nullAware_dynamic() async {
-    await analyze('''
-_f(dynamic d) => d?.x += 1;
-''');
-    visitAssignmentTarget(
-        findNode.propertyAccess('d?.x'), 'dynamic', 'dynamic');
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_nullAware_field_nonNullable() async {
-    await analyze('''
-class _C {
-  int/*!*/ x = 0;
-}
-_f(_C/*?*/ c) => c?.x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('c?.x'), 'int', 'int');
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_nullAware_field_nullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ x = 0;
-}
-_f(_C/*?*/ c) => c?.x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('c?.x'), 'int?', 'int?');
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_nullAware_getter_setter_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  int/*!*/ get x;
-  void set x(num/*!*/ value);
-}
-_f(_C/*?*/ c) => c?.x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('c?.x'), 'int', 'num');
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_nullAware_getter_setter_nullable() async {
-    await analyze('''
-abstract class _C {
-  int/*?*/ get x;
-  void set x(num/*?*/ value);
-}
-_f(_C/*?*/ c) => c?.x += 1;
-''');
-    visitAssignmentTarget(findNode.propertyAccess('c?.x'), 'int?', 'num?');
-  }
-
-  Future
-      test_assignmentTarget_propertyAccess_nullAware_substituted() async {
-    await analyze('''
-abstract class _C {
-  _E get x;
-  void set x(_D value);
-}
-class _D implements Iterable {
-  noSuchMethod(invocation) => super.noSuchMethod(invocation);
-  _D operator+(int i) => this;
-}
-class _E extends _D {}
-_f(_C/*?*/ c) => c?.x += 1;
-''');
-    visitAssignmentTarget(
-        findNode.propertyAccess('c?.x'), '_E', '_D');
-  }
-
-  Future test_assignmentTarget_propertyAccess_substituted() async {
-    await analyze('''
-abstract class _C {
-  _E get x;
-  void set x(_D value);
-}
-class _D implements Iterable {
-  noSuchMethod(invocation) => super.noSuchMethod(invocation);
-  _D operator+(int i) => this;
-}
-class _E extends _D {}
-_f(_C c) => (c).x += 1;
-''');
-    visitAssignmentTarget(
-        findNode.propertyAccess('(c).x'), '_E', '_D');
-  }
-
-  Future test_assignmentTarget_simpleIdentifier_field_generic() async {
-    await analyze('''
-abstract class _C {
-  _C operator+(int i);
-}
-class _D {
-  _D(this.x);
-  _C/*!*/ x;
-  _f() => x += 0;
-}
-''');
-    visitAssignmentTarget(findNode.simple('x +='), '_C', '_C');
-  }
-
-  Future
-      test_assignmentTarget_simpleIdentifier_field_nonNullable() async {
-    await analyze('''
-class _C {
-  int/*!*/ x;
-  _f() => x += 0;
-}
-''');
-    visitAssignmentTarget(findNode.simple('x '), 'int', 'int');
-  }
-
-  Future test_assignmentTarget_simpleIdentifier_field_nullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ x;
-  _f() => x += 0;
-}
-''');
-    visitAssignmentTarget(findNode.simple('x '), 'int?', 'int?');
-  }
-
-  Future test_assignmentTarget_simpleIdentifier_getset_generic() async {
-    await analyze('''
-abstract class _C {
-  _C operator+(int i);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _D/*!*/ get x;
-  void set x(_C/*!*/ value);
-  _f() => x += 0;
-}
-''');
-    visitAssignmentTarget(findNode.simple('x +='), '_D', '_C');
-  }
-
-  Future
-      test_assignmentTarget_simpleIdentifier_getset_getterNullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ get x => 1;
-  void set x(int/*!*/ value) {}
-  _f() => x += 0;
-}
-''');
-    visitAssignmentTarget(findNode.simple('x +='), 'int?', 'int');
-  }
-
-  Future
-      test_assignmentTarget_simpleIdentifier_getset_setterNullable() async {
-    await analyze('''
-class _C {
-  int/*!*/ get x => 1;
-  void set x(int/*?*/ value) {}
-  _f() => x += 0;
-}
-''');
-    visitAssignmentTarget(findNode.simple('x +='), 'int', 'int?');
-  }
-
-  Future
-      test_assignmentTarget_simpleIdentifier_localVariable_nonNullable() async {
-    await analyze('''
-_f(int/*!*/ x) => x += 0;
-''');
-    visitAssignmentTarget(findNode.simple('x '), 'int', 'int');
-  }
-
-  Future
-      test_assignmentTarget_simpleIdentifier_localVariable_nullable() async {
-    await analyze('''
-_f(int/*?*/ x) => x += 0;
-''');
-    visitAssignmentTarget(findNode.simple('x '), 'int?', 'int?');
-  }
-
-  Future
-      test_assignmentTarget_simpleIdentifier_setter_nonNullable() async {
-    await analyze('''
-class _C {
-  void set x(int/*!*/ value) {}
-  _f() => x = 0;
-}
-''');
-    visitAssignmentTarget(findNode.simple('x '), null, 'int');
-  }
-
-  Future test_assignmentTarget_simpleIdentifier_setter_nullable() async {
-    await analyze('''
-class _C {
-  void set x(int/*?*/ value) {}
-  _f() => x = 0;
-}
-''');
-    visitAssignmentTarget(findNode.simple('x '), null, 'int?');
-  }
-
-  Future test_binaryExpression_ampersand_ampersand() async {
-    await analyze('''
-_f(bool x, bool y) => x && y;
-''');
-    visitSubexpression(findNode.binary('&&'), 'bool');
-  }
-
-  Future test_binaryExpression_ampersand_ampersand_flow() async {
-    await analyze('''
-_f(bool/*?*/ x) => x != null && x;
-''');
-    visitSubexpression(findNode.binary('&&'), 'bool');
-  }
-
-  Future test_binaryExpression_ampersand_ampersand_nullChecked() async {
-    await analyze('''
-_f(bool/*?*/ x, bool/*?*/ y) => x && y;
-''');
-    var xRef = findNode.simple('x &&');
-    var yRef = findNode.simple('y;');
-    visitSubexpression(findNode.binary('&&'), 'bool',
-        changes: {xRef: isNullCheck, yRef: isNullCheck});
-  }
-
-  Future test_binaryExpression_bang_eq() async {
-    await analyze('''
-_f(Object/*?*/ x, Object/*?*/ y) => x != y;
-''');
-    visitSubexpression(findNode.binary('!='), 'bool');
-  }
-
-  Future test_binaryExpression_bar_bar() async {
-    await analyze('''
-_f(bool x, bool y) {
-  return x || y;
-}
-''');
-    visitSubexpression(findNode.binary('||'), 'bool');
-  }
-
-  Future test_binaryExpression_bar_bar_flow() async {
-    await analyze('''
-_f(bool/*?*/ x) {
-  return x == null || x;
-}
-''');
-    visitSubexpression(findNode.binary('||'), 'bool');
-  }
-
-  Future test_binaryExpression_bar_bar_nullChecked() async {
-    await analyze('''
-_f(bool/*?*/ x, bool/*?*/ y) {
-  return x || y;
-}
-''');
-    var xRef = findNode.simple('x ||');
-    var yRef = findNode.simple('y;');
-    visitSubexpression(findNode.binary('||'), 'bool',
-        changes: {xRef: isNullCheck, yRef: isNullCheck});
-  }
-
-  Future test_binaryExpression_eq_eq() async {
-    await analyze('''
-_f(Object/*?*/ x, Object/*?*/ y) {
-  return x == y;
-}
-''');
-    visitSubexpression(findNode.binary('=='), 'bool');
-  }
-
-  Future test_binaryExpression_extensionMember_allowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  void operator+(C/*!*/ other) {}
-}
-f(C/*?*/ c) => c + c;
-''');
-    var binaryExpression = findNode.binary('c + c');
-    visitSubexpression(binaryExpression, 'void',
-        changes: {binaryExpression.rightOperand: isNullCheck});
-  }
-
-  Future
-      test_binaryExpression_extensionMember_allowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  void operator+(C/*!*/ other) {}
-}
-f(C/*?*/ c) => E(c) + c;
-''');
-    var binaryExpression = findNode.binary('E(c) + c');
-    visitSubexpression(binaryExpression, 'void',
-        changes: {binaryExpression.rightOperand: isNullCheck});
-  }
-
-  Future test_binaryExpression_extensionMember_disallowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  void operator+(C/*!*/ other) {}
-}
-f(C/*?*/ c) => c + c;
-''');
-    var binaryExpression = findNode.binary('c + c');
-    visitSubexpression(binaryExpression, 'void',
-        changes: {binaryExpression.leftOperand: isNullCheck});
-  }
-
-  Future
-      test_binaryExpression_extensionMember_disallowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  void operator+(C/*!*/ other) {}
-}
-f(C/*?*/ c) => E(c) + c;
-''');
-    var binaryExpression = findNode.binary('E(c) + c');
-    visitSubexpression(binaryExpression, 'void',
-        changes: {findNode.simple('c) +'): isNullCheck});
-  }
-
-  Future test_binaryExpression_question_question() async {
-    await analyze('''
-_f(int/*?*/ x, double/*?*/ y) {
-  return x ?? y;
-}
-''');
-    visitSubexpression(findNode.binary('??'), 'num?');
-  }
-
-  Future test_binaryExpression_question_question_flow() async {
-    await analyze('''
-_f(int/*?*/ x, int/*?*/ y) =>
-    [x ?? (y != null ? 1 : throw 'foo'), y + 1];
-''');
-    // The null check on the RHS of the `??` doesn't promote, because it is not
-    // guaranteed to execute.
-    visitSubexpression(findNode.listLiteral('['), 'List',
-        changes: {findNode.simple('y +'): isNullCheck});
-  }
-
-  Future test_binaryExpression_question_question_nullChecked() async {
-    await analyze('''
-Object/*!*/ _f(int/*?*/ x, double/*?*/ y) {
-  return x ?? y;
-}
-''');
-    var yRef = findNode.simple('y;');
-    visitSubexpression(findNode.binary('??'), 'num',
-        changes: {yRef: isNullCheck});
-  }
-
-  Future test_binaryExpression_userDefinable_dynamic() async {
-    await analyze('''
-Object/*!*/ _f(dynamic d, int/*?*/ i) => d + i;
-''');
-    visitSubexpression(findNode.binary('+'), 'dynamic');
-  }
-
-  Future test_binaryExpression_userDefinable_intRules() async {
-    await analyze('''
-_f(int i, int j) => i + j;
-''');
-    visitSubexpression(findNode.binary('+'), 'int');
-  }
-
-  Future test_binaryExpression_userDefinable_simple() async {
-    await analyze('''
-class _C {
-  int operator+(String s) => 1;
-}
-_f(_C c) => c + 'foo';
-''');
-    visitSubexpression(findNode.binary('c +'), 'int');
-  }
-
-  Future test_binaryExpression_userDefinable_simple_check_lhs() async {
-    await analyze('''
-class _C {
-  int operator+(String s) => 1;
-}
-_f(_C/*?*/ c) => c + 'foo';
-''');
-    visitSubexpression(findNode.binary('c +'), 'int',
-        changes: {findNode.simple('c +'): isNullCheck});
-  }
-
-  Future test_binaryExpression_userDefinable_simple_check_rhs() async {
-    await analyze('''
-class _C {
-  int operator+(String/*!*/ s) => 1;
-}
-_f(_C c, String/*?*/ s) => c + s;
-''');
-    visitSubexpression(findNode.binary('c +'), 'int',
-        changes: {findNode.simple('s;'): isNullCheck});
-  }
-
-  Future test_binaryExpression_userDefinable_substituted() async {
-    await analyze('''
-class _C {
-  T operator+(U u) => throw 'foo';
-}
-_f(_C c) => c + 'foo';
-''');
-    visitSubexpression(findNode.binary('c +'), 'int');
-  }
-
-  Future
-      test_binaryExpression_userDefinable_substituted_check_rhs() async {
-    await analyze('''
-class _C {
-  T operator+(U/*!*/ u) => throw 'foo';
-}
-_f(_C c, String/*?*/ s) => c + s;
-''');
-    visitSubexpression(findNode.binary('c +'), 'int',
-        changes: {findNode.simple('s;'): isNullCheck});
-  }
-
-  Future
-      test_binaryExpression_userDefinable_substituted_no_check_rhs() async {
-    await analyze('''
-class _C {
-  T operator+(U u) => throw 'foo';
-}
-_f(_C c, String/*?*/ s) => c + s;
-''');
-    visitSubexpression(findNode.binary('c +'), 'int');
-  }
-
-  Future test_block() async {
-    await analyze('''
-_f(int/*?*/ x, int/*?*/ y) {
-  { // block
-    x + 1;
-    y + 1;
-  }
-}
-''');
-    visitStatement(findNode.statement('{ // block'), changes: {
-      findNode.simple('x + 1'): isNullCheck,
-      findNode.simple('y + 1'): isNullCheck
-    });
-  }
-
-  Future test_booleanLiteral() async {
-    await analyze('''
-f() => true;
-''');
-    visitSubexpression(findNode.booleanLiteral('true'), 'bool');
-  }
-
-  Future test_compound_assignment_null_shorted_ok() async {
-    await analyze('''
-class C {
-  int/*!*/ x;
-}
-_f(C/*?*/ c) {
-  c?.x += 1;
-}
-''');
-    // Even though c?.x is nullable, it should not be a problem to use it as the
-    // LHS of a compound assignment, because null shorting will ensure that the
-    // assignment only happens if c is non-null.
-    var assignment = findNode.assignment('+=');
-    visitSubexpression(assignment, 'int?');
-  }
-
-  Future test_compound_assignment_nullable_result_bad() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-f(C c) {
-  c += 1;
-}
-''');
-    var assignment = findNode.assignment('+=');
-    visitSubexpression(assignment, 'C?',
-        changes: {assignment: isBadCombinedType});
-  }
-
-  Future test_compound_assignment_nullable_result_ok() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-abstract class D {
-  void set x(C/*?*/ value);
-  C/*!*/ get x;
-  f() {
-    x += 1;
-  }
-}
-''');
-    var assignment = findNode.assignment('+=');
-    visitSubexpression(assignment, 'C?');
-  }
-
-  Future test_compound_assignment_nullable_source() async {
-    await analyze('''
-_f(int/*?*/ x) {
-  x += 1;
-}
-''');
-    var assignment = findNode.assignment('+=');
-    visitSubexpression(assignment, 'int',
-        changes: {assignment: isNullableSource});
-  }
-
-  Future test_compound_assignment_potentially_nullable_source() async {
-    await analyze('''
-class C {
-  _f(T/*!*/ x) {
-    x += 1;
-  }
-}
-''');
-    var assignment = findNode.assignment('+=');
-    visitSubexpression(assignment, 'num',
-        changes: {assignment: isNullableSource});
-  }
-
-  Future test_compound_assignment_promoted_ok() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-f(C/*?*/ x) {
-  if (x != null) {
-    x += 1;
-  }
-}
-''');
-    // The compound assignment is ok, because:
-    // - prior to the assignment, x's value is promoted to non-nullable
-    // - the nullable return value of operator+ is ok to assign to x, because it
-    //   un-does the promotion.
-    visitSubexpression(findNode.assignment('+='), 'C?');
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_conditionalExpression_dead_else_remove() async {
-    await analyze('_f(int x, int/*?*/ y) => x != null ? x + 1 : y + 1.0;');
-    var expression = findNode.conditionalExpression('x != null');
-    visitSubexpression(expression, 'num',
-        changes: {findNode.simple('y +'): isNullCheck});
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_conditionalExpression_dead_else_warn() async {
-    await analyze('_f(int x, int/*?*/ y) => x != null ? x + 1 : y + 1.0;');
-    var expression = findNode.conditionalExpression('x != null');
-    visitSubexpression(expression, 'num',
-        warnOnWeakCode: true, changes: {findNode.simple('y +'): isNullCheck});
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_conditionalExpression_dead_then_remove() async {
-    await analyze('_f(int x, int/*?*/ y) => x == null ? y + 1.0 : x + 1;');
-    var expression = findNode.conditionalExpression('x == null');
-    visitSubexpression(expression, 'num',
-        changes: {findNode.simple('y +'): isNullCheck});
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_conditionalExpression_dead_then_warn() async {
-    await analyze('_f(int x, int/*?*/ y) => x == null ? y + 1.0 : x + 1;');
-    var expression = findNode.conditionalExpression('x == null');
-    visitSubexpression(expression, 'num',
-        warnOnWeakCode: true, changes: {findNode.simple('y +'): isNullCheck});
-  }
-
-  Future test_conditionalExpression_flow_as_condition() async {
-    await analyze('''
-_f(bool x, int/*?*/ y) => (x ? y != null : y != null) ? y + 1 : 0;
-''');
-    // No explicit check needs to be added to `y + 1`, because both arms of the
-    // conditional can only be true if `y != null`.
-    visitSubexpression(findNode.conditionalExpression('y + 1'), 'int');
-  }
-
-  Future test_conditionalExpression_flow_condition() async {
-    await analyze('''
-_f(bool/*?*/ x) => x ? (x && true) : (x && true);
-''');
-    // No explicit check needs to be added to either `x && true`, because there
-    // is already an explicit null check inserted for the condition.
-    visitSubexpression(findNode.conditionalExpression('x ?'), 'bool',
-        changes: {findNode.simple('x ?'): isNullCheck});
-  }
-
-  Future test_conditionalExpression_flow_then_else() async {
-    await analyze('''
-_f(bool x, bool/*?*/ y) => (x ? (y && true) : (y && true)) && y;
-''');
-    // No explicit check needs to be added to the final reference to `y`,
-    // because null checks are added to the "then" and "else" branches promoting
-    // y.
-    visitSubexpression(findNode.binary('&& y'), 'bool', changes: {
-      findNode.simple('y && true) '): isNullCheck,
-      findNode.simple('y && true))'): isNullCheck
-    });
-  }
-
-  Future test_conditionalExpression_lub() async {
-    await analyze('''
-_f(bool b) => b ? 1 : 1.0;
-''');
-    visitSubexpression(findNode.conditionalExpression('1.0'), 'num');
-  }
-
-  Future test_conditionalExpression_throw_promotes() async {
-    await analyze('''
-_f(int/*?*/ x) =>
-    [(x != null ? 1 : throw 'foo'), x + 1];
-''');
-    // No null check needs to be added to `x + 1`, because there is already an
-    // explicit null check.
-    visitSubexpression(findNode.listLiteral('['), 'List');
-  }
-
-  Future
-      test_defaultFormalParameter_add_required_ignore_decoy_annotation() async {
-    await analyze('''
-const foo = Object();
-int _f({@foo int x}) => x + 1;
-''');
-    visitAll(
-        changes: {findNode.defaultParameter('int x'): isAddRequiredKeyword});
-  }
-
-  Future
-      test_defaultFormalParameter_add_required_no_because_default() async {
-    await analyze('''
-int _f({int x = 0}) => x + 1;
-''');
-    visitAll();
-  }
-
-  Future
-      test_defaultFormalParameter_add_required_no_because_nullable() async {
-    await analyze('''
-int _f({int/*?*/ x}) => 1;
-''');
-    visitAll(
-        changes: {findNode.namedType('int/*?*/ x'): isMakeNullableDueToHint});
-  }
-
-  Future
-      test_defaultFormalParameter_add_required_no_because_positional() async {
-    await analyze('''
-int _f([int/*!*/ x]) => x + 1;
-''');
-    visitAll(problems: {
-      findNode.defaultParameter('int/*!*/ x'): {
-        const NonNullableUnnamedOptionalParameter()
-      }
-    });
-  }
-
-  Future
-      test_defaultFormalParameter_add_required_replace_annotation() async {
-    // TODO(paulberry): it would be nice to remove the import of `meta` if it's
-    // no longer needed after the change.
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-int _f({@required int x}) => x + 1;
-''');
-    visitAll(changes: {
-      findNode.annotation('required'): isRequiredAnnotationToRequiredKeyword
-    });
-  }
-
-  Future
-      test_defaultFormalParameter_add_required_replace_annotation_nullable() async {
-    // TODO(paulberry): it would be nice to remove the import of `meta` if it's
-    // no longer needed after the change.
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-void _f({@required int/*?*/ x}) {}
-''');
-    visitAll(changes: {
-      findNode.annotation('required'): isRequiredAnnotationToRequiredKeyword,
-      findNode.namedType('int'): isMakeNullableDueToHint,
-    });
-  }
-
-  Future test_defaultFormalParameter_add_required_yes() async {
-    await analyze('''
-int _f({int x}) => x + 1;
-''');
-    visitAll(
-        changes: {findNode.defaultParameter('int x'): isAddRequiredKeyword});
-  }
-
-  Future test_doubleLiteral() async {
-    await analyze('''
-f() => 1.0;
-''');
-    visitSubexpression(findNode.doubleLiteral('1.0'), 'double');
-  }
-
-  Future test_enum_ref_index() async {
-    await analyze('''
-enum E { V }
-_f(E e) => e.index;
-''');
-    visitSubexpression(findNode.prefixed('e.index'), 'int');
-  }
-
-  Future test_enum_ref_value() async {
-    await analyze('''
-enum E { V }
-_f() => E.V;
-''');
-    visitSubexpression(findNode.prefixed('E.V'), 'E');
-  }
-
-  Future test_enum_ref_values() async {
-    await analyze('''
-enum E { V }
-_f() => E.values;
-''');
-    visitSubexpression(findNode.prefixed('E.values'), 'List');
-  }
-
-  Future test_expressionStatement() async {
-    await analyze('''
-_f(int/*!*/ x, int/*?*/ y) {
-  x = y;
-}
-''');
-    visitStatement(findNode.statement('x = y'),
-        changes: {findNode.simple('y;'): isNullCheck});
-  }
-
-  Future test_firstWhere_transform() async {
-    await analyze('''
-_f(Iterable x) => x.firstWhere((n) => n.isEven, orElse: () => null);
-''');
-    var methodInvocation = findNode.methodInvocation('firstWhere');
-    var functionExpression = findNode.functionExpression('() => null');
-    var fixBuilder = visitSubexpression(methodInvocation, 'int?', changes: {
-      methodInvocation.methodName: isMethodNameChange('firstWhereOrNull'),
-      methodInvocation.argumentList:
-          isDropArgument({functionExpression.parent: anything}),
-      // Behavior of the null literal doesn't matter because it's being dropped.
-      findNode.nullLiteral('null'): anything
-    });
-    expect(fixBuilder.neededCollectionPackageExtensions, {'IterableExtension'});
-  }
-
-  Future test_functionExpressionInvocation_dynamic() async {
-    await analyze('''
-_f(dynamic d) => d();
-''');
-    visitSubexpression(findNode.functionExpressionInvocation('d('), 'dynamic');
-  }
-
-  Future
-      test_functionExpressionInvocation_extensionMember_allowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  void call() {}
-}
-f(C/*?*/ c) => c();
-''');
-    var functionExpressionInvocation =
-        findNode.functionExpressionInvocation('c()');
-    visitSubexpression(functionExpressionInvocation, 'void');
-  }
-
-  Future
-      test_functionExpressionInvocation_extensionMember_allowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  void call() {}
-}
-f(C/*?*/ c) => E(c)();
-''');
-    var functionExpressionInvocation =
-        findNode.functionExpressionInvocation('E(c)()');
-    visitSubexpression(functionExpressionInvocation, 'void');
-  }
-
-  Future
-      test_functionExpressionInvocation_extensionMember_disallowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  void call() {}
-}
-f(C/*?*/ c) => c();
-''');
-    var functionExpressionInvocation =
-        findNode.functionExpressionInvocation('c()');
-    visitSubexpression(functionExpressionInvocation, 'void',
-        changes: {functionExpressionInvocation.function: isNullCheck});
-  }
-
-  Future
-      test_functionExpressionInvocation_extensionMember_disallowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  void call() {}
-}
-f(C/*?*/ c) => E(c)();
-''');
-    var functionExpressionInvocation =
-        findNode.functionExpressionInvocation('E(c)()');
-    visitSubexpression(functionExpressionInvocation, 'void',
-        changes: {findNode.simple('c)()'): isNullCheck});
-  }
-
-  Future test_functionExpressionInvocation_function_checked() async {
-    await analyze('''
-_f(Function/*?*/ func) => func();
-''');
-    visitSubexpression(
-        findNode.functionExpressionInvocation('func('), 'dynamic',
-        changes: {findNode.simple('func()'): isNullCheck});
-  }
-
-  Future test_functionExpressionInvocation_getter() async {
-    await analyze('''
-abstract class _C {
-  int Function() get f;
-}
-_f(_C c) => (c.f)();
-''');
-    visitSubexpression(findNode.functionExpressionInvocation('c.f'), 'int');
-  }
-
-  Future
-      test_functionExpressionInvocation_getter_looksLikeMethodCall() async {
-    await analyze('''
-abstract class _C {
-  int Function() get f;
-}
-_f(_C c) => c.f();
-''');
-    visitSubexpression(findNode.functionExpressionInvocation('c.f'), 'int');
-  }
-
-  Future test_functionExpressionInvocation_getter_nullChecked() async {
-    await analyze('''
-abstract class _C {
-  int Function()/*?*/ get f;
-}
-_f(_C c) => (c.f)();
-''');
-    visitSubexpression(findNode.functionExpressionInvocation('c.f'), 'int',
-        changes: {findNode.parenthesized('c.f'): isNullCheck});
-  }
-
-  Future
-      test_functionExpressionInvocation_getter_nullChecked_looksLikeMethodCall() async {
-    await analyze('''
-abstract class _C {
-  int Function()/*?*/ get f;
-}
-_f(_C c) => c.f();
-''');
-    visitSubexpression(findNode.functionExpressionInvocation('c.f'), 'int',
-        changes: {findNode.propertyAccess('c.f'): isNullCheck});
-  }
-
-  Future test_genericFunctionType_nonNullable() async {
-    await analyze('''
-void _f() {
-  void Function() x = _f;
-}
-''');
-    var genericFunctionType = findNode.genericFunctionType('Function');
-    visitTypeAnnotation(genericFunctionType, 'void Function()',
-        informative: {genericFunctionType: isExplainNonNullable});
-  }
-
-  Future test_genericFunctionType_nonNullable_by_context() async {
-    await analyze('''
-typedef F = void Function();
-''');
-    var genericFunctionType = findNode.genericFunctionType('Function');
-    visitTypeAnnotation(genericFunctionType, 'void Function()',
-        informative: isEmpty);
-  }
-
-  Future test_genericFunctionType_nullable() async {
-    await analyze('''
-void _f() {
-  void Function() x = null;
-}
-''');
-    var genericFunctionTypeAnnotation =
-        findNode.genericFunctionType('Function');
-    visitTypeAnnotation(genericFunctionTypeAnnotation, 'void Function()?',
-        changes: {genericFunctionTypeAnnotation: isMakeNullable});
-  }
-
-  Future test_genericFunctionType_nullable_arg() async {
-    await analyze('''
-void Function(int/*?*/) _f() {
-  void Function(int) x = _g;
-  return x;
-}
-void _g(int/*?*/ x) {}
-''');
-    var intTypeAnnotation = findNode.namedType('int)');
-    var genericFunctionTypeAnnotation =
-        findNode.genericFunctionType('Function(int)');
-    visitTypeAnnotation(genericFunctionTypeAnnotation, 'void Function(int?)',
-        changes: {intTypeAnnotation: isMakeNullable});
-  }
-
-  Future test_genericFunctionType_nullable_return() async {
-    await analyze('''
-void _f() {
-  int Function() x = _g;
-}
-int/*?*/ _g() => null;
-''');
-    var intTypeAnnotation = findNode.namedType('int Function');
-    var genericFunctionTypeAnnotation =
-        findNode.genericFunctionType('Function');
-    visitTypeAnnotation(genericFunctionTypeAnnotation, 'int? Function()',
-        changes: {intTypeAnnotation: isMakeNullable});
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_ifStatement_dead_else() async {
-    await analyze('''
-_f(int x, int/*?*/ y) {
-  if (x != null) {
-    print(x + 1);
-  } else {
-    print(y + 1);
-  }
-}
-''');
-    var ifStatement = findNode.statement('if');
-    visitStatement(ifStatement, changes: {findNode.simple('y +'): isNullCheck});
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_ifStatement_dead_then() async {
-    await analyze('''
-_f(int x, int/*?*/ y) {
-  if (x == null) {
-    print(y + 1);
-  } else {
-    print(x + 1);
-  }
-}
-''');
-    var ifStatement = findNode.statement('if');
-    visitStatement(ifStatement, changes: {findNode.simple('y +'): isNullCheck});
-  }
-
-  Future test_ifStatement_flow_promote_in_else() async {
-    await analyze('''
-_f(int/*?*/ x) {
-  if (x == null) {
-    x + 1;
-  } else {
-    x + 2;
-  }
-}
-''');
-    visitStatement(findNode.statement('if'),
-        changes: {findNode.simple('x + 1'): isNullCheck});
-  }
-
-  Future test_ifStatement_flow_promote_in_then() async {
-    await analyze('''
-_f(int/*?*/ x) {
-  if (x != null) {
-    x + 1;
-  } else {
-    x + 2;
-  }
-}
-''');
-    visitStatement(findNode.statement('if'),
-        changes: {findNode.simple('x + 2'): isNullCheck});
-  }
-
-  Future test_ifStatement_flow_promote_in_then_no_else() async {
-    await analyze('''
-_f(int/*?*/ x) {
-  if (x != null) {
-    x + 1;
-  }
-}
-''');
-    visitStatement(findNode.statement('if'));
-  }
-
-  Future test_implicit_downcast() async {
-    await analyze('int _f(num x) => x;');
-    var xRef = findNode.simple('x;');
-    visitSubexpression(xRef, 'int', changes: {
-      xRef: isNodeChangeForExpression.havingIntroduceAsWithInfo(
-          'int',
-          isInfo(NullabilityFixDescription.downcastExpression,
-              {FixReasonTarget.root: isEdge}))
-    });
-  }
-
-  Future test_import_IterableExtension_already_imported_add_show() async {
-    addPackageFile('collection', 'collection.dart', 'class PriorityQueue {}');
-    await analyze('''
-import 'package:collection/collection.dart' show PriorityQueue;
-
-main() {}
-''');
-    visitAll(injectNeedsIterableExtension: true, changes: {
-      findNode.import('package:collection').combinators[0]:
-          isAddShowOfIterableExtension
-    });
-  }
-
-  Future test_import_IterableExtension_already_imported_all() async {
-    addPackageFile('collection', 'collection.dart', '');
-    await analyze('''
-import 'package:collection/collection.dart';
-
-main() {}
-''');
-    visitAll(injectNeedsIterableExtension: true, changes: {});
-  }
-
-  Future
-      test_import_IterableExtension_already_imported_and_shown() async {
-    addPackageFile('collection', 'collection.dart',
-        'extension IterableExtension on Iterable {}');
-    await analyze('''
-import 'package:collection/collection.dart' show IterableExtension;
-
-main() {}
-''');
-    visitAll(injectNeedsIterableExtension: true, changes: {});
-  }
-
-  Future test_import_IterableExtension_already_imported_prefixed() async {
-    addPackageFile('collection', 'collection.dart', '');
-    await analyze('''
-import 'package:collection/collection.dart' as c;
-
-main() {}
-''');
-    visitAll(
-        injectNeedsIterableExtension: true,
-        changes: {findNode.unit: isAddImportOfIterableExtension});
-  }
-
-  Future test_import_IterableExtension_other_import() async {
-    addPackageFile(
-        'foo', 'foo.dart', 'extension IterableExtension on Iterable {}');
-    await analyze('''
-import 'package:foo/foo.dart' show IterableExtension;
-
-main() {}
-''');
-    visitAll(
-        injectNeedsIterableExtension: true,
-        changes: {findNode.unit: isAddImportOfIterableExtension});
-  }
-
-  Future test_import_IterableExtension_simple() async {
-    await analyze('''
-main() {}
-''');
-    visitAll(
-        injectNeedsIterableExtension: true,
-        changes: {findNode.unit: isAddImportOfIterableExtension});
-  }
-
-  Future test_indexExpression_dynamic() async {
-    await analyze('''
-Object/*!*/ _f(dynamic d, int/*?*/ i) => d[i];
-''');
-    visitSubexpression(findNode.index('d[i]'), 'dynamic');
-  }
-
-  Future test_indexExpression_extensionMember_allowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  int operator[](int index) => 0;
-}
-f(C/*?*/ c) => c[0];
-''');
-    var indexExpression = findNode.index('c[0]');
-    visitSubexpression(indexExpression, 'int');
-  }
-
-  Future
-      test_indexExpression_extensionMember_allowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  int operator[](int index) => 0;
-}
-f(C/*?*/ c) => E(c)[0];
-''');
-    var indexExpression = findNode.index('E(c)[0]');
-    visitSubexpression(indexExpression, 'int');
-  }
-
-  Future test_indexExpression_extensionMember_disallowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  int operator[](int index) => 0;
-}
-f(C/*?*/ c) => c[0];
-''');
-    var indexExpression = findNode.index('c[0]');
-    visitSubexpression(indexExpression, 'int',
-        changes: {indexExpression.target: isNullCheck});
-  }
-
-  Future
-      test_indexExpression_extensionMember_disallowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  int operator[](int index) => 0;
-}
-f(C/*?*/ c) => E(c)[0];
-''');
-    var indexExpression = findNode.index('E(c)[0]');
-    visitSubexpression(indexExpression, 'int',
-        changes: {findNode.simple('c)[0]'): isNullCheck});
-  }
-
-  Future test_indexExpression_simple() async {
-    await analyze('''
-class _C {
-  int operator[](String s) => 1;
-}
-_f(_C c) => c['foo'];
-''');
-    visitSubexpression(findNode.index('c['), 'int');
-  }
-
-  Future test_indexExpression_simple_check_lhs() async {
-    await analyze('''
-class _C {
-  int operator[](String s) => 1;
-}
-_f(_C/*?*/ c) => c['foo'];
-''');
-    visitSubexpression(findNode.index('c['), 'int',
-        changes: {findNode.simple('c['): isNullCheck});
-  }
-
-  Future test_indexExpression_simple_check_rhs() async {
-    await analyze('''
-class _C {
-  int operator[](String/*!*/ s) => 1;
-}
-_f(_C c, String/*?*/ s) => c[s];
-''');
-    visitSubexpression(findNode.index('c['), 'int',
-        changes: {findNode.simple('s]'): isNullCheck});
-  }
-
-  Future test_indexExpression_substituted() async {
-    await analyze('''
-class _C {
-  T operator[](U u) => throw 'foo';
-}
-_f(_C c) => c['foo'];
-''');
-    visitSubexpression(findNode.index('c['), 'int');
-  }
-
-  Future test_indexExpression_substituted_check_rhs() async {
-    await analyze('''
-class _C {
-  T operator[](U/*!*/ u) => throw 'foo';
-}
-_f(_C c, String/*?*/ s) => c[s];
-''');
-    visitSubexpression(findNode.index('c['), 'int',
-        changes: {findNode.simple('s]'): isNullCheck});
-  }
-
-  Future test_indexExpression_substituted_no_check_rhs() async {
-    await analyze('''
-class _C {
-  T operator[](U u) => throw 'foo';
-}
-_f(_C c, String/*?*/ s) => c[s];
-''');
-    visitSubexpression(findNode.index('c['), 'int');
-  }
-
-  Future test_integerLiteral() async {
-    await analyze('''
-f() => 1;
-''');
-    visitSubexpression(findNode.integerLiteral('1'), 'int');
-  }
-
-  Future test_list_ifElement_alive() async {
-    await analyze('''
-_f(int x, bool b, int/*?*/ y) => [if (b) h(y) else g(y)];
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.listLiteral('['), 'List', changes: {
-      findNode.simple('y) else'): isNullCheck,
-      findNode.simple('y)]'): isNullCheck
-    });
-  }
-
-  Future test_list_ifElement_alive_with_null_check() async {
-    await analyze('''
-_f(int x, bool/*?*/ b, int/*?*/ y) => [if (b == null) h(y) else g(y)];
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.listLiteral('['), 'List', changes: {
-      findNode.simple('y) else'): isNullCheck,
-      findNode.simple('y)]'): isNullCheck
-    });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_list_ifElement_dead_else() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => [if (x != null) g(y) else h(y)];
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.listLiteral('['), 'List', changes: {
-      findNode.simple('y) else'): isNullCheck,
-      findNode.simple('y)]'): isNullCheck
-    });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_list_ifElement_dead_else_no_else() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => [if (x != null) g(y)];
-int/*!*/ g(int/*!*/ y) => y;
-''');
-    visitSubexpression(findNode.listLiteral('['), 'List',
-        changes: {findNode.simple('y)]'): isNullCheck});
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_list_ifElement_dead_then() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => [if (x == null) h(y) else g(y)];
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.listLiteral('['), 'List', changes: {
-      findNode.simple('y) else'): isNullCheck,
-      findNode.simple('y)]'): isNullCheck
-    });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_list_ifElement_dead_then_no_else() async {
-    // TODO(paulberry): rather than infer the type to be List,
-    // FixBuilder should add an explicit type argument to ensure that it is
-    // still List.
-    await analyze('''
-_f(int x, int/*?*/ y) => [if (x == null) h(y)];
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.listLiteral('['), 'List',
-        changes: {findNode.simple('y)]'): isNullCheck});
-  }
-
-  Future test_list_make_explicit_type_nullable() async {
-    await analyze('_f() => [null];');
-    // The `null` should be analyzed with a context type of `int?`, so it should
-    // not be null-checked.
-    visitSubexpression(findNode.listLiteral('['), 'List',
-        changes: {findNode.typeAnnotation('int'): isMakeNullable});
-  }
-
-  Future test_list_unchanged() async {
-    await analyze('_f(int x) => [x];');
-    visitSubexpression(findNode.listLiteral('['), 'List');
-  }
-
-  Future test_listLiteral_typed() async {
-    await analyze('''
-_f() => [];
-''');
-    visitSubexpression(findNode.listLiteral('['), 'List');
-  }
-
-  Future test_listLiteral_typed_visit_contents() async {
-    await analyze('''
-_f(int/*?*/ x) => [x];
-''');
-    visitSubexpression(findNode.listLiteral('['), 'List',
-        changes: {findNode.simple('x]'): isNullCheck});
-  }
-
-  Future test_map_ifElement_alive() async {
-    await analyze('''
-_f(int x, bool b, int/*?*/ y) => {if (b) 0: h(y) else 0: g(y)};
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Map',
-        changes: {
-          findNode.simple('y) else'): isNullCheck,
-          findNode.simple('y)}'): isNullCheck
-        });
-  }
-
-  Future test_map_ifElement_alive_with_null_check() async {
-    await analyze('''
-_f(int x, bool/*?*/ b, int/*?*/ y) => {if (b == null) 0: h(y) else 0: g(y)};
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Map',
-        changes: {
-          findNode.simple('y) else'): isNullCheck,
-          findNode.simple('y)}'): isNullCheck
-        });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_map_ifElement_dead_else() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => {if (x != null) 0: g(y) else 0: h(y)};
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Map',
-        changes: {
-          findNode.simple('y) else'): isNullCheck,
-          findNode.simple('y)}'): isNullCheck
-        });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_map_ifElement_dead_else_no_else() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => {if (x != null) 0: g(y)};
-int/*!*/ g(int/*!*/ y) => y;
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Map',
-        changes: {findNode.simple('y)}'): isNullCheck});
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_map_ifElement_dead_then() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => {if (x == null) 0: h(y) else 0: g(y)};
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Map',
-        changes: {
-          findNode.simple('y) else'): isNullCheck,
-          findNode.simple('y)}'): isNullCheck
-        });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_map_ifElement_dead_then_no_else() async {
-    // TODO(paulberry): rather than infer the type to be Map,
-    // FixBuilder should add an explicit type argument to ensure that it is
-    // still Map.
-    await analyze('''
-_f(int x, int/*?*/ y) => {if (x == null) 0: h(y)};
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Map',
-        changes: {findNode.simple('y)}'): isNullCheck});
-  }
-
-  Future test_map_make_explicit_key_type_nullable() async {
-    await analyze('_f() => {null: 0.0};');
-    // The `null` should be analyzed with a context type of `int?`, so it should
-    // not be null-checked.
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Map',
-        changes: {findNode.typeAnnotation('int'): isMakeNullable});
-  }
-
-  Future test_map_make_explicit_value_type_nullable() async {
-    await analyze('_f() => {0.0: null};');
-    // The `null` should be analyzed with a context type of `int?`, so it should
-    // not be null-checked.
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Map',
-        changes: {findNode.typeAnnotation('int'): isMakeNullable});
-  }
-
-  Future test_methodInvocation_dynamic() async {
-    await analyze('''
-Object/*!*/ _f(dynamic d) => d.f();
-''');
-    visitSubexpression(findNode.methodInvocation('d.f'), 'dynamic');
-  }
-
-  Future test_methodInvocation_extensionMember_allowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  void foo() {}
-}
-f(C/*?*/ c) => c.foo();
-''');
-    var methodInvocation = findNode.methodInvocation('c.foo');
-    visitSubexpression(methodInvocation, 'void');
-  }
-
-  Future
-      test_methodInvocation_extensionMember_allowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  void foo() {}
-}
-f(C/*?*/ c) => E(c).foo();
-''');
-    var methodInvocation = findNode.methodInvocation('E(c).foo');
-    visitSubexpression(methodInvocation, 'void');
-  }
-
-  Future test_methodInvocation_extensionMember_disallowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  void foo() {}
-}
-f(C/*?*/ c) => c.foo();
-''');
-    var methodInvocation = findNode.methodInvocation('c.foo');
-    visitSubexpression(methodInvocation, 'void',
-        changes: {methodInvocation.target: isNullCheck});
-  }
-
-  Future
-      test_methodInvocation_extensionMember_disallowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  void foo() {}
-}
-f(C/*?*/ c) => E(c).foo();
-''');
-    var methodInvocation = findNode.methodInvocation('E(c).foo');
-    visitSubexpression(methodInvocation, 'void',
-        changes: {findNode.simple('c).foo'): isNullCheck});
-  }
-
-  Future test_methodInvocation_function_call_nullCheck() async {
-    await analyze('''
-f(void Function()/*?*/ x) => x.call();
-''');
-    var methodInvocation = findNode.methodInvocation('x.call');
-    visitSubexpression(methodInvocation, 'void',
-        changes: {methodInvocation.target: isNullCheck});
-  }
-
-  Future test_methodInvocation_namedParameter() async {
-    await analyze('''
-abstract class _C {
-  int f({int/*!*/ x});
-}
-_f(_C c, int/*?*/ y) => c.f(x: y);
-''');
-    visitSubexpression(findNode.methodInvocation('c.f'), 'int',
-        changes: {findNode.simple('y);'): isNullCheck});
-  }
-
-  Future test_methodInvocation_ordinaryParameter() async {
-    await analyze('''
-abstract class _C {
-  int f(int/*!*/ x);
-}
-_f(_C c, int/*?*/ y) => c.f(y);
-''');
-    visitSubexpression(findNode.methodInvocation('c.f'), 'int',
-        changes: {findNode.simple('y);'): isNullCheck});
-  }
-
-  Future test_methodInvocation_return_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  int f();
-}
-_f(_C c) => c.f();
-''');
-    visitSubexpression(findNode.methodInvocation('c.f'), 'int');
-  }
-
-  Future test_methodInvocation_return_nonNullable_check_target() async {
-    await analyze('''
-abstract class _C {
-  int f();
-}
-_f(_C/*?*/ c) => c.f();
-''');
-    visitSubexpression(findNode.methodInvocation('c.f'), 'int',
-        changes: {findNode.simple('c.f'): isNullCheck});
-  }
-
-  Future test_methodInvocation_return_nonNullable_nullAware() async {
-    await analyze('''
-abstract class _C {
-  int f();
-}
-_f(_C/*?*/ c) => c?.f();
-''');
-    visitSubexpression(findNode.methodInvocation('c?.f'), 'int?');
-  }
-
-  Future test_methodInvocation_return_nullable() async {
-    await analyze('''
-abstract class _C {
-  int/*?*/ f();
-}
-_f(_C c) => c.f();
-''');
-    visitSubexpression(findNode.methodInvocation('c.f'), 'int?');
-  }
-
-  Future test_methodInvocation_static() async {
-    await analyze('''
-_f() => _C.g();
-class _C {
-  static int g() => 1;
-}
-''');
-    visitSubexpression(findNode.methodInvocation('_C.g();'), 'int');
-  }
-
-  Future test_methodInvocation_topLevel() async {
-    await analyze('''
-_f() => _g();
-int _g() => 1;
-''');
-    visitSubexpression(findNode.methodInvocation('_g();'), 'int');
-  }
-
-  Future test_methodInvocation_toString() async {
-    await analyze('''
-abstract class _C {}
-_f(_C/*?*/ c) => c.toString();
-''');
-    visitSubexpression(findNode.methodInvocation('c.toString'), 'String');
-  }
-
-  Future test_null_aware_assignment_non_nullable_source() async {
-    await analyze('''
-abstract class C {
-  int/*!*/ f();
-  g(int/*!*/ x) {
-    x ??= f();
-  }
-}
-''');
-    var assignment = findNode.assignment('??=');
-    visitSubexpression(assignment, 'int',
-        changes: {assignment: isWeakNullAwareAssignment});
-  }
-
-  Future test_null_aware_assignment_nullable_rhs_needs_check() async {
-    await analyze('''
-abstract class C {
-  void set x(int/*!*/ value);
-  int/*?*/ get x;
-  int/*?*/ f();
-  g() {
-    x ??= f();
-  }
-}
-''');
-    var assignment = findNode.assignment('??=');
-    visitSubexpression(assignment, 'int',
-        changes: {assignment.rightHandSide: isNullCheck});
-  }
-
-  Future test_null_aware_assignment_nullable_rhs_ok() async {
-    await analyze('''
-abstract class C {
-  int/*?*/ f();
-  g(int/*?*/ x) {
-    x ??= f();
-  }
-}
-''');
-    var assignment = findNode.assignment('??=');
-    visitSubexpression(assignment, 'int?');
-  }
-
-  Future test_nullable_value_in_null_context() async {
-    await analyze('int/*!*/ f(int/*?*/ i) => i;');
-    var iRef = findNode.simple('i;');
-    visitSubexpression(iRef, 'int', changes: {
-      iRef: isNodeChangeForExpression.havingNullCheckWithInfo(isInfo(
-          NullabilityFixDescription.checkExpression,
-          {FixReasonTarget.root: TypeMatcher()}))
-    });
-  }
-
-  Future test_nullAssertion_promotes() async {
-    await analyze('''
-_f(bool/*?*/ x) => x && x;
-''');
-    // Only the first `x` is null-checked because thereafter, the type of `x` is
-    // promoted to `bool`.
-    visitSubexpression(findNode.binary('&&'), 'bool',
-        changes: {findNode.simple('x &&'): isNullCheck});
-  }
-
-  Future test_nullExpression_noValidMigration() async {
-    await analyze('''
-int/*!*/ f() => g();
-Null g() => null;
-''');
-    var invocation = findNode.methodInvocation('g();');
-    // Note: in spite of the fact that we leave the method invocation alone, we
-    // analyze it as though it has type `Never`, because it's in a context where
-    // `null` doesn't work.
-    visitSubexpression(invocation, 'Never', changes: {
-      invocation: isNodeChangeForExpression.havingNoValidMigrationWithInfo(
-          isInfo(NullabilityFixDescription.noValidMigrationForNull,
-              {FixReasonTarget.root: TypeMatcher()}))
-    });
-  }
-
-  Future test_nullLiteral() async {
-    await analyze('''
-f() => null;
-''');
-    visitSubexpression(findNode.nullLiteral('null'), 'Null');
-  }
-
-  Future test_nullLiteral_hinted() async {
-    await analyze('''
-int/*!*/ f() => null/*!*/;
-''');
-    var literal = findNode.nullLiteral('null');
-    // Normally we would leave the null literal alone and add an informative
-    // comment saying there's no valid migration for it.  But since the user
-    // specifically hinted that `!` should be added, we respect that.
-    visitSubexpression(literal, 'Never', changes: {
-      literal: isNodeChangeForExpression.havingNullCheckWithInfo(isInfo(
-          NullabilityFixDescription.checkExpressionDueToHint,
-          {FixReasonTarget.root: TypeMatcher()}))
-    });
-  }
-
-  Future test_nullLiteral_noValidMigration() async {
-    await analyze('''
-int/*!*/ f() => null;
-''');
-    var literal = findNode.nullLiteral('null');
-    // Note: in spite of the fact that we leave the literal as `null`, we
-    // analyze it as though it has type `Never`, because it's in a context where
-    // `null` doesn't work.
-    visitSubexpression(literal, 'Never', changes: {
-      literal: isNodeChangeForExpression.havingNoValidMigrationWithInfo(isInfo(
-          NullabilityFixDescription.noValidMigrationForNull,
-          {FixReasonTarget.root: TypeMatcher()}))
-    });
-  }
-
-  Future test_parenthesizedExpression() async {
-    await analyze('''
-f() => (1);
-''');
-    visitSubexpression(findNode.integerLiteral('1'), 'int');
-  }
-
-  Future test_parenthesizedExpression_flow() async {
-    await analyze('''
-_f(bool/*?*/ x) => ((x) != (null)) && x;
-''');
-    visitSubexpression(findNode.binary('&&'), 'bool');
-  }
-
-  Future test_post_decrement_int_behavior() async {
-    await analyze('''
-_f(int x) => x--;
-''');
-    // It's not a problem that int.operator- returns `num` (which is not
-    // assignable to `int`) because the value implicitly passed to operator- has
-    // type `int`, so the static type of the result is `int`.
-    visitSubexpression(findNode.postfix('--'), 'int');
-  }
-
-  Future test_post_increment_int_behavior() async {
-    await analyze('''
-_f(int x) => x++;
-''');
-    // It's not a problem that int.operator+ returns `num` (which is not
-    // assignable to `int`) because the value implicitly passed to operator- has
-    // type `int`, so the static type of the result is `int`.
-    visitSubexpression(findNode.postfix('++'), 'int');
-  }
-
-  Future test_post_increment_null_shorted_ok() async {
-    await analyze('''
-class C {
-  int/*!*/ x;
-}
-_f(C/*?*/ c) {
-  c?.x++;
-}
-''');
-    // Even though c?.x is nullable, it should not be a problem to use it as the
-    // target of a post-increment, because null shorting will ensure that the
-    // increment only happens if c is non-null.
-    var increment = findNode.postfix('++');
-    visitSubexpression(increment, 'int?');
-  }
-
-  Future test_post_increment_nullable_result_bad() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-f(C c) {
-  c++;
-}
-''');
-    var increment = findNode.postfix('++');
-    visitSubexpression(increment, 'C', changes: {increment: isBadCombinedType});
-  }
-
-  Future test_post_increment_nullable_result_ok() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-abstract class D {
-  void set x(C/*?*/ value);
-  C/*!*/ get x;
-  f() {
-    x++;
-  }
-}
-''');
-    var increment = findNode.postfix('++');
-    visitSubexpression(increment, 'C');
-  }
-
-  Future test_post_increment_nullable_source() async {
-    await analyze('''
-_f(int/*?*/ x) {
-  x++;
-}
-''');
-    var increment = findNode.postfix('++');
-    visitSubexpression(increment, 'int?',
-        changes: {increment: isNullableSource});
-  }
-
-  Future test_post_increment_potentially_nullable_source() async {
-    await analyze('''
-class C {
-  _f(T/*!*/ x) {
-    x++;
-  }
-}
-''');
-    var increment = findNode.postfix('++');
-    visitSubexpression(increment, 'T', changes: {increment: isNullableSource});
-  }
-
-  Future test_post_increment_promoted_ok() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-f(C/*?*/ x) {
-  if (x != null) {
-    x++;
-  }
-}
-''');
-    // The increment is ok, because:
-    // - prior to the increment, x's value is promoted to non-nullable
-    // - the nullable return value of operator+ is ok to assign to x, because it
-    //   un-does the promotion.
-    visitSubexpression(findNode.postfix('++'), 'C');
-  }
-
-  Future test_postfixExpression_combined_nullable_noProblem() async {
-    await analyze('''
-abstract class _C {
-  _D/*?*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*!*/ get x;
-  void set x(_C/*?*/ value);
-  f() => x++;
-}
-''');
-    visitSubexpression(findNode.postfix('++'), '_C');
-  }
-
-  Future
-      test_postfixExpression_combined_nullable_noProblem_dynamic() async {
-    await analyze('''
-abstract class _E {
-  dynamic get x;
-  void set x(Object/*!*/ value);
-  f() => x++;
-}
-''');
-    visitSubexpression(findNode.postfix('++'), 'dynamic');
-  }
-
-  @FailingTest(reason: 'TODO(paulberry)')
-  Future test_postfixExpression_combined_nullable_problem() async {
-    await analyze('''
-abstract class _C {
-  _D/*?*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*!*/ get x;
-  void set x(_C/*!*/ value);
-  f() => x++;
-}
-''');
-    var postfix = findNode.postfix('++');
-    visitSubexpression(postfix, '_C', problems: {
-      postfix: {const CompoundAssignmentCombinedNullable()}
-    });
-  }
-
-  Future test_postfixExpression_decrement_undoes_promotion() async {
-    await analyze('''
-abstract class _C {
-  _C/*?*/ operator-(int value);
-}
-_f(_C/*?*/ c) { // method
-  if (c != null) {
-    c--;
-    _g(c);
-  }
-}
-_g(_C/*!*/ c) {}
-''');
-    visitStatement(findNode.block('{ // method'),
-        changes: {findNode.simple('c);'): isNullCheck});
-  }
-
-  Future test_postfixExpression_dynamic() async {
-    await analyze('''
-_f(dynamic x) => x++;
-''');
-    visitSubexpression(findNode.postfix('++'), 'dynamic');
-  }
-
-  Future test_postfixExpression_increment_undoes_promotion() async {
-    await analyze('''
-abstract class _C {
-  _C/*?*/ operator+(int value);
-}
-_f(_C/*?*/ c) { // method
-  if (c != null) {
-    c++;
-    _g(c);
-  }
-}
-_g(_C/*!*/ c) {}
-''');
-    visitStatement(findNode.block('{ // method'),
-        changes: {findNode.simple('c);'): isNullCheck});
-  }
-
-  @FailingTest(reason: 'TODO(paulberry)')
-  Future test_postfixExpression_lhs_nullable_problem() async {
-    await analyze('''
-abstract class _C {
-  _D/*!*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*?*/ get x;
-  void set x(_C/*?*/ value);
-  f() => x++;
-}
-''');
-    var postfix = findNode.postfix('++');
-    visitSubexpression(postfix, '_C?', problems: {
-      postfix: {const CompoundAssignmentReadNullable()}
-    });
-  }
-
-  Future test_postfixExpression_rhs_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  _D/*!*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-_f(_C/*!*/ x) => x++;
-''');
-    visitSubexpression(findNode.postfix('++'), '_C');
-  }
-
-  Future test_pre_decrement_int_behavior() async {
-    await analyze('''
-_f(int x) => --x;
-''');
-    // It's not a problem that int.operator- returns `num` (which is not
-    // assignable to `int`) because the value implicitly passed to operator- has
-    // type `int`, so the static type of the result is `int`.
-    visitSubexpression(findNode.prefix('--'), 'int');
-  }
-
-  Future test_pre_increment_int_behavior() async {
-    await analyze('''
-_f(int x) => ++x;
-''');
-    // It's not a problem that int.operator+ returns `num` (which is not
-    // assignable to `int`) because the value implicitly passed to operator- has
-    // type `int`, so the static type of the result is `int`.
-    visitSubexpression(findNode.prefix('++'), 'int');
-  }
-
-  Future test_pre_increment_null_shorted_ok() async {
-    await analyze('''
-class C {
-  int/*!*/ x;
-}
-_f(C/*?*/ c) {
-  ++c?.x;
-}
-''');
-    // Even though c?.x is nullable, it should not be a problem to use it as the
-    // target of a pre-increment, because null shorting will ensure that the
-    // increment only happens if c is non-null.
-    var increment = findNode.prefix('++');
-    visitSubexpression(increment, 'int?');
-  }
-
-  Future test_pre_increment_nullable_result_bad() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-f(C c) {
-  ++c;
-}
-''');
-    var increment = findNode.prefix('++');
-    visitSubexpression(increment, 'C?',
-        changes: {increment: isBadCombinedType});
-  }
-
-  Future test_pre_increment_nullable_result_ok() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-abstract class D {
-  void set x(C/*?*/ value);
-  C/*!*/ get x;
-  f() {
-    ++x;
-  }
-}
-''');
-    var increment = findNode.prefix('++');
-    visitSubexpression(increment, 'C?');
-  }
-
-  Future test_pre_increment_nullable_source() async {
-    await analyze('''
-_f(int/*?*/ x) {
-  ++x;
-}
-''');
-    var increment = findNode.prefix('++');
-    visitSubexpression(increment, 'int',
-        changes: {increment: isNullableSource});
-  }
-
-  Future test_pre_increment_potentially_nullable_source() async {
-    await analyze('''
-class C {
-  _f(T/*!*/ x) {
-    ++x;
-  }
-}
-''');
-    var increment = findNode.prefix('++');
-    visitSubexpression(increment, 'num',
-        changes: {increment: isNullableSource});
-  }
-
-  Future test_pre_increment_promoted_ok() async {
-    await analyze('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-f(C/*?*/ x) {
-  if (x != null) {
-    ++x;
-  }
-}
-''');
-    // The increment is ok, because:
-    // - prior to the increment, x's value is promoted to non-nullable
-    // - the nullable return value of operator+ is ok to assign to x, because it
-    //   un-does the promotion.
-    visitSubexpression(findNode.prefix('++'), 'C?');
-  }
-
-  Future test_prefixedIdentifier_dynamic() async {
-    await analyze('''
-Object/*!*/ _f(dynamic d) => d.x;
-''');
-    visitSubexpression(findNode.prefixed('d.x'), 'dynamic');
-  }
-
-  Future test_prefixedIdentifier_extensionMember_allowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  int get foo => 0;
-}
-f(C/*?*/ c) => c.foo;
-''');
-    var prefixedIdentifier = findNode.prefixed('c.foo');
-    visitSubexpression(prefixedIdentifier, 'int');
-  }
-
-  Future test_prefixedIdentifier_extensionMember_disallowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  int get foo => 0;
-}
-f(C/*?*/ c) => c.foo;
-''');
-    var prefixedIdentifier = findNode.prefixed('c.foo');
-    visitSubexpression(prefixedIdentifier, 'int',
-        changes: {prefixedIdentifier.prefix: isNullCheck});
-  }
-
-  Future test_prefixedIdentifier_field_nonNullable() async {
-    await analyze('''
-class _C {
-  int/*!*/ x = 0;
-}
-_f(_C c) => c.x;
-''');
-    visitSubexpression(findNode.prefixed('c.x'), 'int');
-  }
-
-  Future test_prefixedIdentifier_field_nullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ x = 0;
-}
-_f(_C c) => c.x;
-''');
-    visitSubexpression(findNode.prefixed('c.x'), 'int?');
-  }
-
-  Future test_prefixedIdentifier_getter_check_lhs() async {
-    await analyze('''
-abstract class _C {
-  int get x;
-}
-_f(_C/*?*/ c) => c.x;
-''');
-    visitSubexpression(findNode.prefixed('c.x'), 'int',
-        changes: {findNode.simple('c.x'): isNullCheck});
-  }
-
-  Future test_prefixedIdentifier_getter_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  int/*!*/ get x;
-}
-_f(_C c) => c.x;
-''');
-    visitSubexpression(findNode.prefixed('c.x'), 'int');
-  }
-
-  Future test_prefixedIdentifier_getter_nullable() async {
-    await analyze('''
-abstract class _C {
-  int/*?*/ get x;
-}
-_f(_C c) => c.x;
-''');
-    visitSubexpression(findNode.prefixed('c.x'), 'int?');
-  }
-
-  Future test_prefixedIdentifier_object_getter() async {
-    await analyze('''
-class _C {}
-_f(_C/*?*/ c) => c.hashCode;
-''');
-    visitSubexpression(findNode.prefixed('c.hashCode'), 'int');
-  }
-
-  Future test_prefixedIdentifier_object_tearoff() async {
-    await analyze('''
-class _C {}
-_f(_C/*?*/ c) => c.toString;
-''');
-    visitSubexpression(findNode.prefixed('c.toString'), 'String Function()');
-  }
-
-  Future test_prefixedIdentifier_substituted() async {
-    await analyze('''
-abstract class _C {
-  List get x;
-}
-_f(_C c) => c.x;
-''');
-    visitSubexpression(findNode.prefixed('c.x'), 'List');
-  }
-
-  Future test_prefixExpression_bang_flow() async {
-    await analyze('''
-_f(int/*?*/ x) {
-  if (!(x == null)) {
-    x + 1;
-  }
-}
-''');
-    // No null check should be needed on `x + 1` because `!(x == null)` promotes
-    // x's type to `int`.
-    visitStatement(findNode.statement('if'));
-  }
-
-  Future test_prefixExpression_bang_nonNullable() async {
-    await analyze('''
-_f(bool/*!*/ x) => !x;
-''');
-    visitSubexpression(findNode.prefix('!x'), 'bool');
-  }
-
-  Future test_prefixExpression_bang_nullable() async {
-    await analyze('''
-_f(bool/*?*/ x) => !x;
-''');
-    visitSubexpression(findNode.prefix('!x'), 'bool',
-        changes: {findNode.simple('x;'): isNullCheck});
-  }
-
-  Future test_prefixExpression_combined_nullable_noProblem() async {
-    await analyze('''
-abstract class _C {
-  _D/*?*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*!*/ get x;
-  void set x(_C/*?*/ value);
-  f() => ++x;
-}
-''');
-    visitSubexpression(findNode.prefix('++'), '_D?');
-  }
-
-  Future
-      test_prefixExpression_combined_nullable_noProblem_dynamic() async {
-    await analyze('''
-abstract class _E {
-  dynamic get x;
-  void set x(Object/*!*/ value);
-  f() => ++x;
-}
-''');
-    var prefix = findNode.prefix('++');
-    visitSubexpression(prefix, 'dynamic');
-  }
-
-  @FailingTest(reason: 'TODO(paulberry)')
-  Future test_prefixExpression_combined_nullable_problem() async {
-    await analyze('''
-abstract class _C {
-  _D/*?*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*!*/ get x;
-  void set x(_C/*!*/ value);
-  f() => ++x;
-}
-''');
-    var prefix = findNode.prefix('++');
-    visitSubexpression(prefix, '_D', problems: {
-      prefix: {const CompoundAssignmentCombinedNullable()}
-    });
-  }
-
-  Future test_prefixExpression_decrement_undoes_promotion() async {
-    await analyze('''
-abstract class _C {
-  _C/*?*/ operator-(int value);
-}
-_f(_C/*?*/ c) { // method
-  if (c != null) {
-    --c;
-    _g(c);
-  }
-}
-_g(_C/*!*/ c) {}
-''');
-    visitStatement(findNode.block('{ // method'),
-        changes: {findNode.simple('c);'): isNullCheck});
-  }
-
-  Future test_prefixExpression_extensionMember_allowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  C operator-() => C();
-}
-f(C/*?*/ c) => -c;
-''');
-    var prefixExpression = findNode.prefix('-c');
-    visitSubexpression(prefixExpression, 'C');
-  }
-
-  Future
-      test_prefixExpression_extensionMember_allowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  C operator-() => C();
-}
-f(C/*?*/ c) => -E(c);
-''');
-    var prefixExpression = findNode.prefix('-E(c)');
-    visitSubexpression(prefixExpression, 'C');
-  }
-
-  Future test_prefixExpression_extensionMember_disallowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  C operator-() => C();
-}
-f(C/*?*/ c) => -c;
-''');
-    var prefixExpression = findNode.prefix('-c');
-    visitSubexpression(prefixExpression, 'C',
-        changes: {prefixExpression.operand: isNullCheck});
-  }
-
-  Future
-      test_prefixExpression_extensionMember_disallowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  C operator-() => C();
-}
-f(C/*?*/ c) => -E(c);
-''');
-    var prefixExpression = findNode.prefix('-E(c)');
-    visitSubexpression(prefixExpression, 'C',
-        changes: {findNode.simple('c);'): isNullCheck});
-  }
-
-  Future test_prefixExpression_increment_undoes_promotion() async {
-    await analyze('''
-abstract class _C {
-  _C/*?*/ operator+(int value);
-}
-_f(_C/*?*/ c) { // method
-  if (c != null) {
-    ++c;
-    _g(c);
-  }
-}
-_g(_C/*!*/ c) {}
-''');
-    visitStatement(findNode.block('{ // method'),
-        changes: {findNode.simple('c);'): isNullCheck});
-  }
-
-  Future test_prefixExpression_intRules() async {
-    await analyze('''
-_f(int x) => ++x;
-''');
-    visitSubexpression(findNode.prefix('++'), 'int');
-  }
-
-  @FailingTest(reason: 'TODO(paulberry)')
-  Future test_prefixExpression_lhs_nullable_problem() async {
-    await analyze('''
-abstract class _C {
-  _D/*!*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-abstract class _E {
-  _C/*?*/ get x;
-  void set x(_C/*?*/ value);
-  f() => ++x;
-}
-''');
-    var prefix = findNode.prefix('++');
-    visitSubexpression(prefix, '_D', problems: {
-      prefix: {const CompoundAssignmentReadNullable()}
-    });
-  }
-
-  Future test_prefixExpression_minus_dynamic() async {
-    await analyze('''
-_f(dynamic x) => -x;
-''');
-    visitSubexpression(findNode.prefix('-x'), 'dynamic');
-  }
-
-  Future test_prefixExpression_minus_nonNullable() async {
-    await analyze('''
-_f(int/*!*/ x) => -x;
-''');
-    visitSubexpression(findNode.prefix('-x'), 'int');
-  }
-
-  Future test_prefixExpression_minus_nullable() async {
-    await analyze('''
-_f(int/*?*/ x) => -x;
-''');
-    visitSubexpression(findNode.prefix('-x'), 'int',
-        changes: {findNode.simple('x;'): isNullCheck});
-  }
-
-  Future test_prefixExpression_minus_substitution() async {
-    await analyze('''
-abstract class _C {
-  List operator-();
-}
-_f(_C x) => -x;
-''');
-    visitSubexpression(findNode.prefix('-x'), 'List');
-  }
-
-  Future test_prefixExpression_rhs_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  _D/*!*/ operator+(int/*!*/ value);
-}
-abstract class _D extends _C {}
-_f(_C/*!*/ x) => ++x;
-''');
-    visitSubexpression(findNode.prefix('++'), '_D');
-  }
-
-  Future test_prefixExpression_tilde_dynamic() async {
-    await analyze('''
-_f(dynamic x) => ~x;
-''');
-    visitSubexpression(findNode.prefix('~x'), 'dynamic');
-  }
-
-  Future test_prefixExpression_tilde_nonNullable() async {
-    await analyze('''
-_f(int/*!*/ x) => ~x;
-''');
-    visitSubexpression(findNode.prefix('~x'), 'int');
-  }
-
-  Future test_prefixExpression_tilde_nullable() async {
-    await analyze('''
-_f(int/*?*/ x) => ~x;
-''');
-    visitSubexpression(findNode.prefix('~x'), 'int',
-        changes: {findNode.simple('x;'): isNullCheck});
-  }
-
-  Future test_prefixExpression_tilde_substitution() async {
-    await analyze('''
-abstract class _C {
-  List operator~();
-}
-_f(_C x) => ~x;
-''');
-    visitSubexpression(findNode.prefix('~x'), 'List');
-  }
-
-  Future test_propertyAccess_dynamic() async {
-    await analyze('''
-Object/*!*/ _f(dynamic d) => (d).x;
-''');
-    visitSubexpression(findNode.propertyAccess('(d).x'), 'dynamic');
-  }
-
-  Future test_propertyAccess_extensionMember_allowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  int get foo => 0;
-}
-f(C/*?*/ Function() g) => g().foo;
-''');
-    var propertyAccess = findNode.propertyAccess('g().foo');
-    visitSubexpression(propertyAccess, 'int');
-  }
-
-  Future test_propertyAccess_extensionMember_allowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*?*/ {
-  int get foo => 0;
-}
-f(C/*?*/ Function() g) => E(g()).foo;
-''');
-    var propertyAccess = findNode.propertyAccess('E(g()).foo');
-    visitSubexpression(propertyAccess, 'int');
-  }
-
-  Future test_propertyAccess_extensionMember_disallowsNull() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  int get foo => 0;
-}
-f(C/*?*/ Function() g) => g().foo;
-''');
-    var propertyAccess = findNode.propertyAccess('g().foo');
-    visitSubexpression(propertyAccess, 'int',
-        changes: {propertyAccess.target: isNullCheck});
-  }
-
-  Future
-      test_propertyAccess_extensionMember_disallowsNull_explicit() async {
-    await analyze('''
-class C {}
-extension E on C/*!*/ {
-  int get foo => 0;
-}
-f(C/*?*/ Function() g) => E(g()).foo;
-''');
-    var propertyAccess = findNode.propertyAccess('E(g()).foo');
-    visitSubexpression(propertyAccess, 'int', changes: {
-      findNode.functionExpressionInvocation('g()).foo'): isNullCheck
-    });
-  }
-
-  Future test_propertyAccess_field_nonNullable() async {
-    await analyze('''
-class _C {
-  int/*!*/ x = 0;
-}
-_f(_C c) => (c).x;
-''');
-    visitSubexpression(findNode.propertyAccess('(c).x'), 'int');
-  }
-
-  Future test_propertyAccess_field_nullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ x = 0;
-}
-_f(_C c) => (c).x;
-''');
-    visitSubexpression(findNode.propertyAccess('(c).x'), 'int?');
-  }
-
-  Future test_propertyAccess_getter_check_lhs() async {
-    await analyze('''
-abstract class _C {
-  int get x;
-}
-_f(_C/*?*/ c) => (c).x;
-''');
-    visitSubexpression(findNode.propertyAccess('(c).x'), 'int',
-        changes: {findNode.parenthesized('(c).x'): isNullCheck});
-  }
-
-  Future test_propertyAccess_getter_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  int/*!*/ get x;
-}
-_f(_C c) => (c).x;
-''');
-    visitSubexpression(findNode.propertyAccess('(c).x'), 'int');
-  }
-
-  Future test_propertyAccess_getter_nullable() async {
-    await analyze('''
-abstract class _C {
-  int/*?*/ get x;
-}
-_f(_C c) => (c).x;
-''');
-    visitSubexpression(findNode.propertyAccess('(c).x'), 'int?');
-  }
-
-  Future test_propertyAccess_nullAware_dynamic() async {
-    await analyze('''
-Object/*!*/ _f(dynamic d) => d?.x;
-''');
-    visitSubexpression(findNode.propertyAccess('d?.x'), 'dynamic');
-  }
-
-  Future test_propertyAccess_nullAware_field_nonNullable() async {
-    await analyze('''
-class _C {
-  int/*!*/ x = 0;
-}
-_f(_C/*?*/ c) => c?.x;
-''');
-    visitSubexpression(findNode.propertyAccess('c?.x'), 'int?');
-  }
-
-  Future test_propertyAccess_nullAware_field_nullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ x = 0;
-}
-_f(_C/*?*/ c) => c?.x;
-''');
-    visitSubexpression(findNode.propertyAccess('c?.x'), 'int?');
-  }
-
-  Future test_propertyAccess_nullAware_getter_nonNullable() async {
-    await analyze('''
-abstract class _C {
-  int/*!*/ get x;
-}
-_f(_C/*?*/ c) => c?.x;
-''');
-    visitSubexpression(findNode.propertyAccess('c?.x'), 'int?');
-  }
-
-  Future test_propertyAccess_nullAware_getter_nullable() async {
-    await analyze('''
-abstract class _C {
-  int/*?*/ get x;
-}
-_f(_C/*?*/ c) => c?.x;
-''');
-    visitSubexpression(findNode.propertyAccess('c?.x'), 'int?');
-  }
-
-  Future test_propertyAccess_nullAware_object_getter() async {
-    await analyze('''
-class _C {}
-_f(_C/*?*/ c) => c?.hashCode;
-''');
-    visitSubexpression(findNode.propertyAccess('c?.hashCode'), 'int?');
-  }
-
-  Future test_propertyAccess_nullAware_object_tearoff() async {
-    await analyze('''
-class _C {}
-_f(_C/*?*/ c) => c?.toString;
-''');
-    visitSubexpression(
-        findNode.propertyAccess('c?.toString'), 'String Function()?');
-  }
-
-  Future test_propertyAccess_nullAware_potentiallyNullable() async {
-    // In the code example below, the `?.` is not changed to `.` because `T`
-    // might be instantiated to `int?`, in which case the null check is still
-    // needed.
-    await analyze('''
-class C {
-  f(T t) => t?.isEven;
-}
-''');
-    visitSubexpression(findNode.propertyAccess('?.'), 'bool?');
-  }
-
-  Future test_propertyAccess_nullAware_removeNullAwareness() async {
-    await analyze('_f(int/*!*/ i) => i?.isEven;');
-    var propertyAccess = findNode.propertyAccess('?.');
-    visitSubexpression(propertyAccess, 'bool',
-        changes: {propertyAccess: isRemoveNullAwareness});
-  }
-
-  Future
-      test_propertyAccess_nullAware_removeNullAwareness_nullCheck() async {
-    await analyze('''
-class C {
-  int/*?*/ i;
-}
-int/*!*/ f(C/*!*/ c) => c?.i;
-''');
-    var propertyAccess = findNode.propertyAccess('?.');
-    visitSubexpression(propertyAccess, 'int', changes: {
-      propertyAccess: TypeMatcher()
-          .havingNullCheckWithInfo(isNotNull)
-          .having(
-              (c) => c.nullAwarenessRemoval != NullAwarenessRemovalType.none,
-              'removeNullAwareness',
-              true)
-    });
-  }
-
-  Future test_propertyAccess_nullAware_substituted() async {
-    await analyze('''
-abstract class _C {
-  List get x;
-}
-_f(_C/*?*/ c) => c?.x;
-''');
-    visitSubexpression(findNode.propertyAccess('c?.x'), 'List?');
-  }
-
-  Future test_propertyAccess_object_getter() async {
-    await analyze('''
-class _C {}
-_f(_C/*?*/ c) => (c).hashCode;
-''');
-    visitSubexpression(findNode.propertyAccess('(c).hashCode'), 'int');
-  }
-
-  Future test_propertyAccess_object_tearoff() async {
-    await analyze('''
-class _C {}
-_f(_C/*?*/ c) => (c).toString;
-''');
-    visitSubexpression(
-        findNode.propertyAccess('(c).toString'), 'String Function()');
-  }
-
-  Future test_propertyAccess_substituted() async {
-    await analyze('''
-abstract class _C {
-  List get x;
-}
-_f(_C c) => (c).x;
-''');
-    visitSubexpression(findNode.propertyAccess('(c).x'), 'List');
-  }
-
-  Future test_removeLanguageVersionComment() async {
-    await analyze('''
-// ignore: illegal_language_version_override
-// @dart = 2.6
-void main() {}
-''');
-    visitAll(changes: {findNode.unit: isRemoveLanguageVersion});
-  }
-
-  Future test_removeLanguageVersionComment_withCopyright() async {
-    await analyze('''
-// Some copyright notice here...
-// ignore: illegal_language_version_override
-// @dart = 2.6
-void main() {}
-''');
-    visitAll(changes: {findNode.unit: isRemoveLanguageVersion});
-  }
-
-  Future test_set_ifElement_alive() async {
-    await analyze('''
-_f(int x, bool b, int/*?*/ y) => {if (b) h(y) else g(y)};
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Set', changes: {
-      findNode.simple('y) else'): isNullCheck,
-      findNode.simple('y)}'): isNullCheck
-    });
-  }
-
-  Future test_set_ifElement_alive_with_null_check() async {
-    await analyze('''
-_f(int x, bool/*?*/ b, int/*?*/ y) => {if (b == null) h(y) else g(y)};
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Set', changes: {
-      findNode.simple('y) else'): isNullCheck,
-      findNode.simple('y)}'): isNullCheck
-    });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_set_ifElement_dead_else() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => {if (x != null) g(y) else h(y)};
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Set', changes: {
-      findNode.simple('y) else'): isNullCheck,
-      findNode.simple('y)}'): isNullCheck
-    });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_set_ifElement_dead_else_no_else() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => {if (x != null) g(y)};
-int/*!*/ g(int/*!*/ y) => y;
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Set',
-        changes: {findNode.simple('y)}'): isNullCheck});
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_set_ifElement_dead_then() async {
-    await analyze('''
-_f(int x, int/*?*/ y) => {if (x == null) h(y) else g(y)};
-int/*!*/ g(int/*!*/ y) => y;
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Set', changes: {
-      findNode.simple('y) else'): isNullCheck,
-      findNode.simple('y)}'): isNullCheck
-    });
-  }
-
-  /* TODO(yanok): not dead anymore, remove? */
-  Future test_set_ifElement_dead_then_no_else() async {
-    // TODO(paulberry): rather than infer the type to be Map,
-    // FixBuilder should add an explicit type argument to ensure that it is
-    // still Set.
-    await analyze('''
-_f(int x, int/*?*/ y) => {if (x == null) h(y)};
-double/*!*/ h(int/*!*/ y) => y.toDouble();
-''');
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Set',
-        changes: {findNode.simple('y)}'): isNullCheck});
-  }
-
-  Future test_set_make_explicit_type_nullable() async {
-    await analyze('_f() => {null};');
-    // The `null` should be analyzed with a context type of `int?`, so it should
-    // not be null-checked.
-    visitSubexpression(findNode.setOrMapLiteral('{'), 'Set',
-        changes: {findNode.typeAnnotation('int'): isMakeNullable});
-  }
-
-  Future test_simpleIdentifier_className() async {
-    await analyze('''
-_f() => int;
-''');
-    visitSubexpression(findNode.simple('int'), 'Type');
-  }
-
-  Future test_simpleIdentifier_field() async {
-    await analyze('''
-class _C {
-  int i = 1;
-  f() => i;
-}
-''');
-    visitSubexpression(findNode.simple('i;'), 'int');
-  }
-
-  Future test_simpleIdentifier_field_generic() async {
-    await analyze('''
-class _C {
-  List x = null;
-  f() => x;
-}
-''');
-    visitSubexpression(findNode.simple('x;'), 'List?');
-  }
-
-  Future test_simpleIdentifier_field_nullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ i = 1;
-  f() => i;
-}
-''');
-    visitSubexpression(findNode.simple('i;'), 'int?');
-  }
-
-  Future test_simpleIdentifier_getter() async {
-    await analyze('''
-class _C {
-  int get i => 1;
-  f() => i;
-}
-''');
-    visitSubexpression(findNode.simple('i;'), 'int');
-  }
-
-  Future test_simpleIdentifier_getter_nullable() async {
-    await analyze('''
-class _C {
-  int/*?*/ get i => 1;
-  f() => i;
-}
-''');
-    visitSubexpression(findNode.simple('i;'), 'int?');
-  }
-
-  Future test_simpleIdentifier_localVariable_nonNullable() async {
-    await analyze('''
-_f(int x) {
-  return x;
-}
-''');
-    visitSubexpression(findNode.simple('x;'), 'int');
-  }
-
-  Future test_simpleIdentifier_localVariable_nullable() async {
-    await analyze('''
-_f(int/*?*/ x) {
-  return x;
-}
-''');
-    visitSubexpression(findNode.simple('x;'), 'int?');
-  }
-
-  Future test_simpleIdentifier_null_check_hint() async {
-    await analyze('int/*?*/ _f(int/*?*/ x) => x/*!*/;');
-    var xRef = findNode.simple('x/*!*/');
-    visitSubexpression(xRef, 'int', changes: {
-      xRef: isNodeChangeForExpression.havingNullCheckWithInfo(isInfo(
-          NullabilityFixDescription.checkExpressionDueToHint,
-          {FixReasonTarget.root: TypeMatcher()}))
-    });
-  }
-
-  Future test_stringLiteral() async {
-    await analyze('''
-f() => 'foo';
-''');
-    visitSubexpression(findNode.stringLiteral("'foo'"), 'String');
-  }
-
-  Future test_suspicious_cast() async {
-    await analyze('''
-int f(Object o) {
-  if (o is! String) return 0;
-  return o;
-}
-''');
-    var xRef = findNode.simple('o;');
-    visitSubexpression(xRef, 'int', changes: {xRef: isNoValidMigration});
-  }
-
-  Future test_symbolLiteral() async {
-    await analyze('''
-f() => #foo;
-''');
-    visitSubexpression(findNode.symbolLiteral('#foo'), 'Symbol');
-  }
-
-  Future test_throw_flow() async {
-    await analyze('''
-_f(int/*?*/ i) {
-  if (i == null) throw 'foo';
-  i + 1;
-}
-''');
-    visitStatement(findNode.block('{'));
-  }
-
-  Future test_throw_nullable() async {
-    await analyze('''
-_f(int/*?*/ i) => throw i;
-''');
-    visitSubexpression(findNode.throw_('throw'), 'Never',
-        changes: {findNode.simple('i;'): isNullCheck});
-  }
-
-  Future test_throw_simple() async {
-    await analyze('''
-_f() => throw 'foo';
-''');
-    visitSubexpression(findNode.throw_('throw'), 'Never');
-  }
-
-  Future test_typeName_dynamic() async {
-    await analyze('''
-void _f() {
-  dynamic d = null;
-}
-''');
-    visitTypeAnnotation(findNode.typeAnnotation('dynamic'), 'dynamic');
-  }
-
-  Future test_typeName_futureOr_dynamic_nullable() async {
-    await analyze('''
-import 'dart:async';
-void _f() {
-  FutureOr x = null;
-}
-''');
-    // The type of `x` should be `FutureOr?`, but this is equivalent to
-    // `FutureOr`, so we don't add a `?`.  Note: expected type is
-    // still `FutureOr?`; we don't go to extra effort to remove the
-    // redundant `?` from the internal type representation, just from the source
-    // code we generate.
-    visitTypeAnnotation(
-        findNode.typeAnnotation('FutureOr x'), 'FutureOr?',
-        changes: {});
-  }
-
-  Future test_typeName_futureOr_inner() async {
-    await analyze('''
-import 'dart:async';
-void _f(FutureOr x) {
-  FutureOr y = x;
-}
-''');
-    visitTypeAnnotation(
-        findNode.typeAnnotation('FutureOr y'), 'FutureOr',
-        changes: {findNode.typeAnnotation('int> y'): isMakeNullable});
-  }
-
-  Future test_typeName_futureOr_null_nullable() async {
-    await analyze('''
-import 'dart:async';
-void _f() {
-  FutureOr x = null;
-}
-''');
-    // The type of `x` should be `FutureOr?`, but this is equivalent to
-    // `FutureOr`, so we don't add a `?`.  Note: expected type is
-    // still `FutureOr?`; we don't go to extra effort to remove the
-    // redundant `?` from the internal type representation, just from the source
-    // code we generate.
-    visitTypeAnnotation(
-        findNode.typeAnnotation('FutureOr x'), 'FutureOr?',
-        changes: {});
-  }
-
-  Future test_typeName_futureOr_outer() async {
-    await analyze('''
-import 'dart:async';
-void _f(FutureOr/*?*/ x) {
-  FutureOr y = x;
-}
-''');
-    var typeAnnotation = findNode.typeAnnotation('FutureOr y');
-    visitTypeAnnotation(typeAnnotation, 'FutureOr?',
-        changes: {typeAnnotation: isMakeNullable});
-  }
-
-  Future test_typeName_futureOr_redundant() async {
-    await analyze('''
-import 'dart:async';
-void _f(bool b, FutureOr/*?*/ x, FutureOr y) {
-  FutureOr z = b ? x : y;
-}
-''');
-    // The type of `z` should be `FutureOr?`, but this is equivalent to
-    // `FutureOr`, so we only add the first `?`.  Note: expected type is
-    // still `FutureOr?`; we don't go to extra effort to remove the
-    // redundant `?` from the internal type representation, just from the source
-    // code we generate.
-    visitTypeAnnotation(
-        findNode.typeAnnotation('FutureOr z'), 'FutureOr?',
-        changes: {findNode.typeAnnotation('int> z'): isMakeNullable});
-  }
-
-  Future test_typeName_futureOr_void_nullable() async {
-    await analyze('''
-import 'dart:async';
-void _f() {
-  FutureOr x = null;
-}
-''');
-    // The type of `x` should be `FutureOr?`, but this is equivalent to
-    // `FutureOr`, so we don't add a `?`.  Note: expected type is
-    // still `FutureOr?`; we don't go to extra effort to remove the
-    // redundant `?` from the internal type representation, just from the source
-    // code we generate.
-    visitTypeAnnotation(
-        findNode.typeAnnotation('FutureOr x'), 'FutureOr?',
-        changes: {});
-  }
-
-  Future test_typeName_generic_nonNullable() async {
-    await analyze('''
-void _f() {
-  List i = [0];
-}
-''');
-    visitTypeAnnotation(findNode.typeAnnotation('List'), 'List');
-  }
-
-  Future test_typeName_generic_nullable() async {
-    await analyze('''
-void _f() {
-  List i = null;
-}
-''');
-    var listIntAnnotation = findNode.typeAnnotation('List');
-    visitTypeAnnotation(listIntAnnotation, 'List?',
-        changes: {listIntAnnotation: isMakeNullable});
-  }
-
-  Future test_typeName_generic_nullable_arg() async {
-    await analyze('''
-void _f() {
-  List i = [null];
-}
-''');
-    visitTypeAnnotation(findNode.typeAnnotation('List'), 'List',
-        changes: {findNode.typeAnnotation('int'): isMakeNullable});
-  }
-
-  Future test_typeName_generic_nullable_arg_and_outer() async {
-    await analyze('''
-void _f(bool b) {
-  List i = b ? [null] : null;
-}
-''');
-    var listInt = findNode.typeAnnotation('List');
-    visitTypeAnnotation(listInt, 'List?', changes: {
-      findNode.typeAnnotation('int'): isMakeNullable,
-      listInt: isMakeNullable
-    });
-  }
-
-  Future test_typeName_simple_nonNullable() async {
-    await analyze('''
-void _f() {
-  int i = 0;
-}
-''');
-    var typeAnnotation = findNode.typeAnnotation('int');
-    visitTypeAnnotation(typeAnnotation, 'int',
-        informative: {typeAnnotation: isExplainNonNullable});
-  }
-
-  Future test_typeName_simple_nonNullable_by_context() async {
-    await analyze('''
-class C extends Object {}
-''');
-    visitTypeAnnotation(findNode.typeAnnotation('Object'), 'Object',
-        informative: isEmpty);
-  }
-
-  Future test_typeName_simple_nullable() async {
-    await analyze('''
-void _f() {
-  int i = null;
-}
-''');
-    var intAnnotation = findNode.typeAnnotation('int');
-    visitTypeAnnotation(intAnnotation, 'int?',
-        changes: {intAnnotation: isMakeNullable});
-  }
-
-  Future test_typeName_void() async {
-    await analyze('''
-void _f() {
-  return;
-}
-''');
-    visitTypeAnnotation(findNode.typeAnnotation('void'), 'void');
-  }
-
-  Future test_use_of_dynamic() async {
-    // Use of `dynamic` in a context requiring non-null is not explicitly null
-    // checked.
-    await analyze('''
-bool _f(dynamic d, bool b) => d && b;
-''');
-    visitSubexpression(findNode.binary('&&'), 'bool');
-  }
-
-  Future test_variableDeclaration_typed_initialized_nonNullable() async {
-    await analyze('''
-void _f() {
-  int x = 0;
-}
-''');
-    visitStatement(findNode.statement('int x'));
-  }
-
-  Future test_variableDeclaration_typed_initialized_nullable() async {
-    await analyze('''
-void _f() {
-  int x = null;
-}
-''');
-    visitStatement(findNode.statement('int x'),
-        changes: {findNode.typeAnnotation('int'): isMakeNullable});
-  }
-
-  Future test_variableDeclaration_typed_uninitialized() async {
-    await analyze('''
-void _f() {
-  int x;
-}
-''');
-    visitStatement(findNode.statement('int x'));
-  }
-
-  Future test_variableDeclaration_untyped_initialized() async {
-    await analyze('''
-void _f() {
-  var x = 0;
-}
-''');
-    visitStatement(findNode.statement('var x'));
-  }
-
-  Future test_variableDeclaration_untyped_uninitialized() async {
-    await analyze('''
-void _f() {
-  var x;
-}
-''');
-    visitStatement(findNode.statement('var x'));
-  }
-
-  Future test_variableDeclaration_visit_initializer() async {
-    await analyze('''
-void _f(bool/*?*/ x, bool/*?*/ y) {
-  bool z = x && y;
-}
-''');
-    visitStatement(findNode.statement('bool z'), changes: {
-      findNode.simple('x &&'): isNullCheck,
-      findNode.simple('y;'): isNullCheck
-    });
-  }
-
-  Future test_where_transform() async {
-    await analyze('''
-Iterable _f(Iterable x) => x.where((e) => e != null);
-''');
-    var methodInvocation = findNode.methodInvocation('where');
-    var functionExpression = findNode.functionExpression('(e) => e != null');
-    var fixBuilder =
-        visitSubexpression(methodInvocation, 'Iterable', changes: {
-      methodInvocation.methodName: isMethodNameChange('whereNotNull'),
-      methodInvocation.argumentList:
-          isDropArgument({functionExpression: anything}),
-    });
-    expect(fixBuilder.neededCollectionPackageExtensions,
-        {'IterableNullableExtension'});
-  }
-
-  void visitAll(
-      {Map changes = const {},
-      Map> problems = const >{},
-      bool injectNeedsIterableExtension = false}) {
-    var fixBuilder = _createFixBuilder(testUnit!);
-    if (injectNeedsIterableExtension) {
-      fixBuilder.neededCollectionPackageExtensions.add('IterableExtension');
-    }
-    fixBuilder.visitAll();
-    expect(scopedChanges(fixBuilder, testUnit), changes);
-    expect(scopedProblems(fixBuilder, testUnit), problems);
-  }
-
-  void visitAssignmentTarget(
-      Expression node, String? expectedReadType, String expectedWriteType,
-      {Map changes = const {},
-      Map> problems = const >{}}) {
-    var fixBuilder = _createFixBuilder(node);
-    fixBuilder.visitAll();
-    var targetInfo = _computeAssignmentTargetInfo(node, fixBuilder);
-    if (expectedReadType == null) {
-      expect(targetInfo.readType, null);
-    } else {
-      expect(targetInfo.readType!.getDisplayString(withNullability: true),
-          expectedReadType);
-    }
-    expect(targetInfo.writeType!.getDisplayString(withNullability: true),
-        expectedWriteType);
-    expect(scopedChanges(fixBuilder, node), changes);
-    expect(scopedProblems(fixBuilder, node), problems);
-  }
-
-  void visitStatement(Statement node,
-      {Map changes = const {},
-      Map> problems = const >{}}) {
-    var fixBuilder = _createFixBuilder(node);
-    fixBuilder.visitAll();
-    expect(scopedChanges(fixBuilder, node), changes);
-    expect(scopedProblems(fixBuilder, node), problems);
-  }
-
-  FixBuilder visitSubexpression(Expression node, String expectedType,
-      {Map changes = const {},
-      Map> problems = const >{},
-      bool warnOnWeakCode = false}) {
-    var fixBuilder = _createFixBuilder(node, warnOnWeakCode: warnOnWeakCode);
-    fixBuilder.visitAll();
-    var type = node.staticType!;
-    expect(type.getDisplayString(withNullability: true), expectedType);
-    expect(scopedChanges(fixBuilder, node), changes);
-    expect(scopedProblems(fixBuilder, node), problems);
-    return fixBuilder;
-  }
-
-  void visitTypeAnnotation(TypeAnnotation node, String expectedType,
-      {Map changes = const {},
-      Map> problems = const >{},
-      dynamic informative = anything}) {
-    var fixBuilder = _createFixBuilder(node);
-    fixBuilder.visitAll();
-    var type = node.type!;
-    expect(type.getDisplayString(withNullability: true), expectedType);
-    expect(scopedChanges(fixBuilder, node), changes);
-    expect(scopedProblems(fixBuilder, node), problems);
-    expect(scopedInformative(fixBuilder, node), informative);
-  }
-
-  AssignmentTargetInfo _computeAssignmentTargetInfo(
-      Expression node, FixBuilder fixBuilder) {
-    try {
-      assert(
-          identical(ElementTypeProvider.current, const ElementTypeProvider()));
-      ElementTypeProvider.current = fixBuilder.migrationResolutionHooks;
-      var assignment = node.thisOrAncestorOfType()!;
-      var readType = assignment.readType;
-      var writeType = assignment.writeType;
-      return AssignmentTargetInfo(readType, writeType);
-    } finally {
-      ElementTypeProvider.current = const ElementTypeProvider();
-    }
-  }
-
-  FixBuilder _createFixBuilder(AstNode scope, {bool warnOnWeakCode = false}) {
-    var unit = scope.thisOrAncestorOfType()!;
-    var definingLibrary = unit.declaredElement!.library;
-    return FixBuilder(
-        testSource,
-        decoratedClassHierarchy,
-        typeProvider,
-        typeSystem,
-        variables,
-        definingLibrary as LibraryElementImpl,
-        null,
-        scope.thisOrAncestorOfType(),
-        warnOnWeakCode,
-        graph, {});
-  }
-
-  bool _isInScope(AstNode node, AstNode? scope) {
-    return node
-            .thisOrAncestorMatching((ancestor) => identical(ancestor, scope)) !=
-        null;
-  }
-}
-
-extension _NodeChangeForExpressionExtension
-    on TypeMatcher {
-  TypeMatcher havingExpressionChange(
-          dynamic changeMatcher, dynamic infoMatcher) =>
-      having((c) => c.expressionChanges.single, 'expressionChanges.single',
-              changeMatcher)
-          .having((c) => c.expressionChangeInfos.single,
-              'expressionChangeInfos.single', infoMatcher);
-
-  TypeMatcher havingIntroduceAsWithInfo(
-          dynamic typeStringMatcher, dynamic infoMatcher) =>
-      havingExpressionChange(
-          TypeMatcher().having(
-              (c) => c.type.toString(), 'type (string)', typeStringMatcher),
-          infoMatcher);
-
-  TypeMatcher havingNoValidMigrationWithInfo(dynamic matcher) =>
-      havingExpressionChange(TypeMatcher(), matcher);
-
-  TypeMatcher havingNullCheckWithInfo(dynamic matcher) =>
-      havingExpressionChange(TypeMatcher(), matcher);
-}
diff --git a/pkg/nnbd_migration/test/fix_reason_target_test.dart b/pkg/nnbd_migration/test/fix_reason_target_test.dart
deleted file mode 100644
index c36391ff8a94..000000000000
--- a/pkg/nnbd_migration/test/fix_reason_target_test.dart
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/fix_reason_target.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(FixReasonTargetTest);
-  });
-}
-
-@reflectiveTest
-class FixReasonTargetTest {
-  void test_suffix_complex() {
-    var root = FixReasonTarget.root;
-    expect(root.returnType.typeArgument(0).suffix,
-        ' for type argument 0 of return type');
-    expect(root.yieldedType.namedParameter('foo').suffix,
-        ' for parameter foo of yielded type');
-    expect(root.namedParameter('foo').positionalParameter(0).suffix,
-        ' for parameter 0 of parameter foo');
-    expect(root.positionalParameter(0).returnType.suffix,
-        ' for return type of parameter 0');
-    expect(root.typeArgument(0).yieldedType.suffix,
-        ' for yielded type from type argument 0');
-  }
-
-  void test_suffix_simple() {
-    var root = FixReasonTarget.root;
-    expect(root.suffix, '');
-    expect(root.returnType.suffix, ' for return type');
-    expect(root.yieldedType.suffix, ' for yielded type');
-    expect(root.namedParameter('foo').suffix, ' for parameter foo');
-    expect(root.positionalParameter(0).suffix, ' for parameter 0');
-    expect(root.typeArgument(0).suffix, ' for type argument 0');
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/analysis_abstract.dart b/pkg/nnbd_migration/test/front_end/analysis_abstract.dart
deleted file mode 100644
index 1ae62ea1e969..000000000000
--- a/pkg/nnbd_migration/test/front_end/analysis_abstract.dart
+++ /dev/null
@@ -1,79 +0,0 @@
-// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:test/test.dart';
-
-import '../abstract_context.dart';
-
-/// An abstract base for all 'analysis' domain tests.
-class AbstractAnalysisTest extends AbstractContextTest {
-  String? projectPath;
-  String? testFolder;
-  String? testFile;
-  late String testCode;
-
-  AbstractAnalysisTest();
-
-  void addAnalysisOptionsFile(String content) {
-    newFile(
-        resourceProvider.pathContext
-            .join(projectPath!, 'analysis_options.yaml'),
-        content);
-  }
-
-  String? addTestFile(String content) {
-    newFile(testFile!, content);
-    testCode = content;
-    return testFile;
-  }
-
-  /// Create an analysis options file based on the given arguments.
-  void createAnalysisOptionsFile({List? experiments}) {
-    var buffer = StringBuffer();
-    if (experiments != null) {
-      buffer.writeln('analyzer:');
-      buffer.writeln('  enable-experiment:');
-      for (var experiment in experiments) {
-        buffer.writeln('    - $experiment');
-      }
-    }
-    addAnalysisOptionsFile(buffer.toString());
-  }
-
-  /// Creates a project [projectPath].
-  void createProject({Map? packageRoots}) {
-    newFolder(projectPath!);
-  }
-
-  /// Returns the offset of [search] in the file at the given [path].
-  /// Fails if not found.
-  int findFileOffset(String path, String search) {
-    var file = getFile(path);
-    var code = file.createSource().contents.data;
-    var offset = code.indexOf(search);
-    expect(offset, isNot(-1), reason: '"$search" in\n$code');
-    return offset;
-  }
-
-  /// Returns the offset of [search] in [testCode].
-  /// Fails if not found.
-  int findOffset(String search) {
-    var offset = testCode.indexOf(search);
-    expect(offset, isNot(-1));
-    return offset;
-  }
-
-  String? modifyTestFile(String content) {
-    modifyFile(testFile!, content);
-    testCode = content;
-    return testFile;
-  }
-
-  void setUp() {
-    super.setUp();
-    projectPath = convertPath(testsPath);
-    testFolder = convertPath('$testsPath/bin');
-    testFile = convertPath('$testsPath/bin/test.dart');
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/info_builder_test.dart b/pkg/nnbd_migration/test/front_end/info_builder_test.dart
deleted file mode 100644
index 316567db98d9..000000000000
--- a/pkg/nnbd_migration/test/front_end/info_builder_test.dart
+++ /dev/null
@@ -1,1759 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/analysis/results.dart';
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/front_end/info_builder.dart';
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/hint_action.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'analysis_abstract.dart';
-import 'nnbd_migration_test_base.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(BuildEnclosingMemberDescriptionTest);
-    defineReflectiveTests(InfoBuilderTest);
-  });
-}
-
-@reflectiveTest
-class BuildEnclosingMemberDescriptionTest extends AbstractAnalysisTest {
-  Future resolveTestFile() async {
-    return await session.getResolvedUnit(testFile!) as ResolvedUnitResult;
-  }
-
-  Future test_classConstructor_named() async {
-    addTestFile(r'''
-class C {
-  C.aaa();
-}
-''');
-    var result = await resolveTestFile();
-    ClassDeclaration class_ =
-        result.unit.declarations.single as ClassDeclaration;
-    var constructor = class_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(constructor),
-        equals("the constructor 'C.aaa'"));
-  }
-
-  Future test_classConstructor_unnamed() async {
-    addTestFile(r'''
-class C {
-  C();
-}
-''');
-    var result = await resolveTestFile();
-    ClassDeclaration class_ =
-        result.unit.declarations.single as ClassDeclaration;
-    var constructor = class_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(constructor),
-        equals("the default constructor of 'C'"));
-  }
-
-  Future test_classField() async {
-    addTestFile(r'''
-class C {
-  int i;
-}
-''');
-    var result = await resolveTestFile();
-    ClassDeclaration class_ =
-        result.unit.declarations.single as ClassDeclaration;
-    FieldDeclaration fieldDeclaration =
-        class_.members.single as FieldDeclaration;
-    var field = fieldDeclaration.fields.variables[0];
-    expect(InfoBuilder.buildEnclosingMemberDescription(field),
-        equals("the field 'C.i'"));
-  }
-
-  Future test_classField_from_type() async {
-    addTestFile(r'''
-class C {
-  int i;
-}
-''');
-    var result = await resolveTestFile();
-    ClassDeclaration class_ =
-        result.unit.declarations.single as ClassDeclaration;
-    FieldDeclaration fieldDeclaration =
-        class_.members.single as FieldDeclaration;
-    var type = fieldDeclaration.fields.type;
-    expect(InfoBuilder.buildEnclosingMemberDescription(type),
-        equals("the field 'C.i'"));
-  }
-
-  Future test_classGetter() async {
-    addTestFile(r'''
-class C {
-  int get aaa => 7;
-}
-''');
-    var result = await resolveTestFile();
-    ClassDeclaration class_ =
-        result.unit.declarations.single as ClassDeclaration;
-    var getter = class_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(getter),
-        equals("the getter 'C.aaa'"));
-  }
-
-  Future test_classMethod() async {
-    addTestFile(r'''
-class C {
-  int aaa() => 7;
-}
-''');
-    var result = await resolveTestFile();
-    ClassDeclaration class_ =
-        result.unit.declarations.single as ClassDeclaration;
-    var method = class_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(method),
-        equals("the method 'C.aaa'"));
-  }
-
-  Future test_classOperator() async {
-    addTestFile(r'''
-class C {
-  bool operator ==(Object other) => false;
-}
-''');
-    var result = await resolveTestFile();
-    ClassDeclaration class_ =
-        result.unit.declarations.single as ClassDeclaration;
-    var operator = class_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(operator),
-        equals("the operator 'C.=='"));
-  }
-
-  Future test_classSetter() async {
-    addTestFile(r'''
-class C {
-  void set aaa(value) {}
-}
-''');
-    var result = await resolveTestFile();
-    ClassDeclaration class_ =
-        result.unit.declarations.single as ClassDeclaration;
-    var setter = class_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(setter),
-        equals("the setter 'C.aaa='"));
-  }
-
-  Future test_extensionMethod() async {
-    addTestFile(r'''
-extension E on List {
-  int aaa() => 7;
-}
-''');
-    var result = await resolveTestFile();
-    ExtensionDeclaration extension_ =
-        result.unit.declarations.single as ExtensionDeclaration;
-    var method = extension_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(method),
-        equals("the method 'E.aaa'"));
-  }
-
-  Future test_extensionMethod_unnamed() async {
-    addTestFile(r'''
-extension on List {
-  int aaa() => 7;
-}
-''');
-    var result = await resolveTestFile();
-    ExtensionDeclaration extension_ =
-        result.unit.declarations.single as ExtensionDeclaration;
-    var method = extension_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(method),
-        equals("the method 'aaa' in unnamed extension on List"));
-  }
-
-  Future test_mixinMethod() async {
-    addTestFile(r'''
-mixin C {
-  int aaa() => 7;
-}
-''');
-    var result = await resolveTestFile();
-    MixinDeclaration mixin_ =
-        result.unit.declarations.single as MixinDeclaration;
-    var method = mixin_.members.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(method),
-        equals("the method 'C.aaa'"));
-  }
-
-  Future test_topLevelFunction() async {
-    addTestFile(r'''
-void aaa(value) {}
-''');
-    var result = await resolveTestFile();
-    var function = result.unit.declarations.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(function),
-        equals("the function 'aaa'"));
-  }
-
-  Future test_topLevelGetter() async {
-    addTestFile(r'''
-int get aaa => 7;
-''');
-    var result = await resolveTestFile();
-    var getter = result.unit.declarations.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(getter),
-        equals("the getter 'aaa'"));
-  }
-
-  Future test_topLevelSetter() async {
-    addTestFile(r'''
-void set aaa(value) {}
-''');
-    var result = await resolveTestFile();
-    var setter = result.unit.declarations.single;
-    expect(InfoBuilder.buildEnclosingMemberDescription(setter),
-        equals("the setter 'aaa='"));
-  }
-
-  Future test_topLevelVariable() async {
-    addTestFile(r'''
-int i;
-''');
-    var result = await resolveTestFile();
-    TopLevelVariableDeclaration topLevelVariableDeclaration =
-        result.unit.declarations.single as TopLevelVariableDeclaration;
-    var variable = topLevelVariableDeclaration.variables.variables[0];
-    expect(InfoBuilder.buildEnclosingMemberDescription(variable),
-        equals("the variable 'i'"));
-  }
-
-  Future test_topLevelVariable_from_type() async {
-    addTestFile(r'''
-int i;
-''');
-    var result = await resolveTestFile();
-    TopLevelVariableDeclaration topLevelVariableDeclaration =
-        result.unit.declarations.single as TopLevelVariableDeclaration;
-    var type = topLevelVariableDeclaration.variables.type;
-    expect(InfoBuilder.buildEnclosingMemberDescription(type),
-        equals("the variable 'i'"));
-  }
-}
-
-@reflectiveTest
-class InfoBuilderTest extends NnbdMigrationTestBase {
-  /// Assert various properties of the given [edit].
-  bool assertEdit(
-      {required EditDetail? edit,
-      int? offset,
-      int? length,
-      String? replacement}) {
-    expect(edit, isNotNull);
-    if (offset != null) {
-      expect(edit!.offset, offset);
-    }
-    if (length != null) {
-      expect(edit!.length, length);
-    }
-    if (replacement != null) {
-      expect(edit!.replacement, replacement);
-    }
-    return true;
-  }
-
-  List getNonInformativeRegions(List regions) {
-    return regions
-        .where((region) =>
-            region.kind != NullabilityFixKind.typeNotMadeNullable &&
-            region.kind != NullabilityFixKind.typeNotMadeNullableDueToHint)
-        .toList();
-  }
-
-  Future test_addLate() async {
-    var content = '''
-f() {
-  String s;
-  if (1 == 2) s = "Hello";
-  g(s);
-}
-g(String /*!*/ s) {}
-''';
-    var migratedContent = '''
-f() {
-  late String  s;
-  if (1 == 2) s = "Hello";
-  g(s);
-}
-g(String /*!*/ s) {}
-''';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(2));
-    var region = regions[0];
-    assertRegion(
-        region: region,
-        offset: 8,
-        length: 4,
-        explanation: 'Added a late keyword',
-        kind: NullabilityFixKind.addLate);
-  }
-
-  Future test_addLate_dueToHint() async {
-    var content = '/*late*/ int x = 0;';
-    var migratedContent = '/*late*/ int  x = 0;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(2));
-    var textToRemove = '/*late*/ ';
-    assertRegionPair(regions, 0,
-        offset1: migratedContent.indexOf('/*'),
-        length1: 2,
-        offset2: migratedContent.indexOf('*/'),
-        length2: 2,
-        explanation: 'Added a late keyword, due to a hint',
-        kind: NullabilityFixKind.addLateDueToHint,
-        edits: (List edits) => assertEdit(
-            edit: edits.single,
-            offset: content.indexOf(textToRemove),
-            length: textToRemove.length,
-            replacement: ''));
-  }
-
-  Future test_addLate_dueToTestSetup() async {
-    addTestCorePackage();
-    var content = '''
-import 'package:test/test.dart';
-void main() {
-  int i;
-  setUp(() {
-    i = 1;
-  });
-  test('a', () {
-    f(i);
-  });
-  f(int /*?*/ i) {}
-}
-''';
-    var migratedContent = '''
-import 'package:test/test.dart';
-void main() {
-  late int  i;
-  setUp(() {
-    i = 1;
-  });
-  test('a', () {
-    f(i);
-  });
-  f(int /*?*/ i) {}
-}
-''';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(3));
-    var region = regions[0];
-    assertRegion(
-        region: region,
-        offset: 49,
-        length: 4,
-        explanation: 'Added a late keyword, due to assignment in `setUp`',
-        kind: NullabilityFixKind.addLateDueToTestSetup);
-  }
-
-  Future test_addLateFinal_dueToHint() async {
-    var content = '/*late final*/ int x = 0;';
-    var migratedContent = '/*late final*/ int  x = 0;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(2));
-    var textToRemove = '/*late final*/ ';
-    assertRegionPair(regions, 0,
-        offset1: migratedContent.indexOf('/*'),
-        length1: 2,
-        offset2: migratedContent.indexOf('*/'),
-        length2: 2,
-        explanation: 'Added late and final keywords, due to a hint',
-        kind: NullabilityFixKind.addLateFinalDueToHint,
-        edits: (List edits) => assertEdit(
-            edit: edits.single,
-            offset: content.indexOf(textToRemove),
-            length: textToRemove.length,
-            replacement: ''));
-  }
-
-  Future test_addLateHint_classMultipleTypedInstanceVariable() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  int f, g;
-  C() {
-    f = 1;
-  }
-}
-''', migratedContent: '''
-class C {
-  int? f, g;
-  C() {
-    f = 1;
-  }
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 15,
-        length: 1,
-        explanation: "Changed type 'int' to be nullable",
-        kind: NullabilityFixKind.makeTypeNullable);
-    assertEdit(edit: edits[2], offset: 12, length: 0, replacement: '/*late*/');
-  }
-
-  Future test_addLateHint_classTypedFinalInstanceVariable() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  final int f;
-  C({this.f});
-}
-''', migratedContent: '''
-class C {
-  final int? f;
-  C({this.f});
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 21,
-        length: 1,
-        explanation: "Changed type 'int' to be nullable",
-        kind: NullabilityFixKind.makeTypeNullable);
-    assertEdit(edit: edits[2], offset: 12, length: 0, replacement: '/*late*/');
-  }
-
-  Future test_addLateHint_classTypedInstanceVariable() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  int f;
-  C() {
-    f = 1;
-  }
-}
-''', migratedContent: '''
-class C {
-  int? f;
-  C() {
-    f = 1;
-  }
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 15,
-        length: 1,
-        explanation: "Changed type 'int' to be nullable",
-        kind: NullabilityFixKind.makeTypeNullable);
-    assertEdit(edit: edits[2], offset: 12, length: 0, replacement: '/*late*/');
-  }
-
-  Future test_addLateHint_classTypedStaticVariable() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  static int x;
-  void f() => x = null;
-}
-''', migratedContent: '''
-class C {
-  static int? x;
-  void f() => x = null;
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 22,
-        length: 1,
-        explanation: "Changed type 'int' to be nullable",
-        kind: NullabilityFixKind.makeTypeNullable);
-    assertEdit(edit: edits[2], offset: 19, length: 0, replacement: '/*late*/');
-  }
-
-  Future test_addLateHint_mixinVarInstanceVariable() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-mixin M {
-  int f;
-  void m() => f = null;
-}
-''', migratedContent: '''
-mixin M {
-  int? f;
-  void m() => f = null;
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 15,
-        length: 1,
-        explanation: "Changed type 'int' to be nullable",
-        kind: NullabilityFixKind.makeTypeNullable);
-    assertEdit(edit: edits[2], offset: 12, length: 0, replacement: '/*late*/');
-  }
-
-  Future test_addLateHint_typedLocalVariable() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-void f() {
-  int x;
-  void g() => x = null;
-}
-''', migratedContent: '''
-void f() {
-  int? x;
-  void g() => x = null;
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 16,
-        length: 1,
-        explanation: "Changed type 'int' to be nullable",
-        kind: NullabilityFixKind.makeTypeNullable);
-    assertEdit(edit: edits[2], offset: 13, length: 0, replacement: '/*late*/');
-  }
-
-  Future test_addLateHint_typedTopLevelVariable() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-int x;
-void f() => x = null;
-''', migratedContent: '''
-int? x;
-void f() => x = null;
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 3,
-        length: 1,
-        explanation: "Changed type 'int' to be nullable",
-        kind: NullabilityFixKind.makeTypeNullable);
-    assertEdit(edit: edits[2], offset: 0, length: 0, replacement: '/*late*/');
-  }
-
-  Future test_compound_assignment_nullable_result() async {
-    var unit = await buildInfoForSingleTestFile('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-void f(C/*!*/ a, int b) {
-  a += b;
-}
-''', migratedContent: '''
-abstract class C {
-  C/*?*/ operator+(int? i);
-}
-void f(C/*!*/ a, int? b) {
-  a += b;
-}
-''');
-    var operator = '+=';
-    var operatorOffset = unit.content!.indexOf(operator);
-    var region =
-        unit.regions.where((region) => region.offset == operatorOffset).single;
-    assertRegion(
-        region: region,
-        length: operator.length,
-        explanation: 'Compound assignment has bad combined type',
-        kind: NullabilityFixKind.compoundAssignmentHasBadCombinedType,
-        edits: isEmpty);
-  }
-
-  Future test_compound_assignment_nullable_source() async {
-    var unit = await buildInfoForSingleTestFile('''
-void f(int/*?*/ a, int b) {
-  a += b;
-}
-''', migratedContent: '''
-void f(int/*?*/ a, int  b) {
-  a += b;
-}
-''');
-    var operator = '+=';
-    var operatorOffset = unit.content!.indexOf(operator);
-    var region =
-        unit.regions.where((region) => region.offset == operatorOffset).single;
-    assertRegion(
-        region: region,
-        length: operator.length,
-        explanation: 'Compound assignment has nullable source',
-        kind: NullabilityFixKind.compoundAssignmentHasNullableSource,
-        edits: isEmpty);
-  }
-
-  Future test_discardCondition() async {
-    var unit = await buildInfoForSingleTestFile('''
-void g(int i) {
-  print(i.isEven);
-  if (i != null) print('NULL');
-}
-''', migratedContent: '''
-void g(int  i) {
-  print(i.isEven);
-  /* if (i != null) */ print('NULL');
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(2));
-    assertRegion(
-        region: regions[0],
-        offset: 38,
-        length: 3,
-        kind: NullabilityFixKind.removeDeadCode);
-    assertRegion(
-        region: regions[1],
-        offset: 56,
-        length: 3,
-        kind: NullabilityFixKind.removeDeadCode);
-  }
-
-  Future test_downcast_nonNullable() async {
-    var content = 'int/*!*/ f(num/*!*/ n) => n;';
-    var migratedContent = 'int/*!*/ f(num/*!*/ n) => n as int;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = getNonInformativeRegions(unit.regions);
-    expect(regions, hasLength(1));
-    var region = regions.single;
-    var regionTarget = ' as int';
-    assertRegion(
-        region: region,
-        offset: migratedContent.indexOf(regionTarget),
-        length: regionTarget.length,
-        kind: NullabilityFixKind.downcastExpression,
-        edits: isEmpty,
-        traces: isEmpty);
-  }
-
-  Future test_downcast_nonNullable_to_nullable() async {
-    var content = 'int/*?*/ f(num/*!*/ n) => n;';
-    var migratedContent = 'int/*?*/ f(num/*!*/ n) => n as int;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = getNonInformativeRegions(unit.regions);
-    var regionTarget = ' as int';
-    var offset = migratedContent.indexOf(regionTarget);
-    var region = regions.where((region) => region.offset == offset).single;
-    assertRegion(
-        region: region,
-        offset: offset,
-        length: regionTarget.length,
-        kind: NullabilityFixKind.downcastExpression,
-        edits: isEmpty,
-        traces: isEmpty);
-  }
-
-  Future test_downcast_nullable() async {
-    var content = 'int/*?*/ f(num/*?*/ n) => n;';
-    var migratedContent = 'int/*?*/ f(num/*?*/ n) => n as int?;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = getNonInformativeRegions(unit.regions);
-    var regionTarget = ' as int?';
-    var offset = migratedContent.indexOf(regionTarget);
-    var region = regions.where((region) => region.offset == offset).single;
-    assertRegion(
-        region: region,
-        offset: offset,
-        length: regionTarget.length,
-        kind: NullabilityFixKind.downcastExpression,
-        edits: isEmpty,
-        traces: isEmpty);
-  }
-
-  Future test_downcast_nullable_to_nonNullable() async {
-    var content = 'int/*!*/ f(num/*?*/ n) => n;';
-    var migratedContent = 'int/*!*/ f(num/*?*/ n) => n as int;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = getNonInformativeRegions(unit.regions);
-    var regionTarget = ' as int';
-    var offset = migratedContent.indexOf(regionTarget);
-    var region = regions.where((region) => region.offset == offset).single;
-    assertRegion(
-        region: region,
-        offset: offset,
-        length: regionTarget.length,
-        kind: NullabilityFixKind.downcastExpression,
-        edits: isEmpty,
-        traces: isNotEmpty);
-  }
-
-  Future test_downcast_with_traces() async {
-    var content = 'List/*!*/ f(List/*?*/ x) => x;';
-    var migratedContent =
-        'List/*!*/ f(List/*?*/ x) => x as List;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.regions.where(
-        (region) => region.kind == NullabilityFixKind.downcastExpression);
-    expect(regions, hasLength(1));
-    var region = regions.single;
-    var regionTarget = ' as List';
-    assertRegion(
-        region: region,
-        offset: migratedContent.indexOf(regionTarget),
-        length: regionTarget.length,
-        kind: NullabilityFixKind.downcastExpression,
-        edits: isEmpty,
-        traces: isNotEmpty);
-    var traceDescriptionToOffset = {
-      for (var trace in region.traces)
-        trace.description: trace.entries[0].target!.offset
-    };
-    expect(traceDescriptionToOffset, {
-      'Nullability reason': content.indexOf('List/*?*/'),
-      'Non-nullability reason': content.indexOf('List/*!*/'),
-      'Nullability reason for type argument 0': content.indexOf('int/*?*/'),
-      'Non-nullability reason for type argument 0': content.indexOf('int/*!*/')
-    });
-  }
-
-  Future test_dynamicValueIsUsed() async {
-    var unit = await buildInfoForSingleTestFile('''
-bool f(int i) {
-  if (i == null) return true;
-  else return false;
-}
-void g() {
-  dynamic i = null;
-  f(i);
-}
-''', migratedContent: '''
-bool  f(int? i) {
-  if (i == null) return true;
-  else return false;
-}
-void g() {
-  dynamic i = null;
-  f(i);
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 11,
-        explanation: "Changed type 'int' to be nullable");
-    assertEdit(edit: edits[0], offset: 10, replacement: '/*!*/');
-    assertEdit(edit: edits[1], offset: 10, replacement: '/*?*/');
-  }
-
-  Future test_expressionFunctionReturnTarget() async {
-    var unit = await buildInfoForSingleTestFile('''
-String g() => 1 == 2 ? "Hello" : null;
-''', migratedContent: '''
-String? g() => 1 == 2 ? "Hello" : null;
-''');
-    assertInTargets(targets: unit.targets, offset: 7, length: 1); // "g"
-    var regions = unit.regions;
-    expect(regions, hasLength(1));
-    assertRegion(
-        region: regions[0],
-        offset: 6,
-        explanation: "Changed type 'String' to be nullable");
-  }
-
-  Future test_function_typed_parameter_made_nullable_due_to_hint() async {
-    var content = 'f(void g(int i)/*?*/) {}';
-    var migratedContent = 'f(void g(int  i)/*?*/) {}';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(2));
-    var textToRemove = '/*?*/';
-    assertRegionPair(regions, 0,
-        offset1: migratedContent.indexOf(textToRemove),
-        length1: 2,
-        offset2: migratedContent.indexOf(textToRemove) + 3,
-        length2: 2,
-        explanation:
-            "Changed type 'void Function(int)' to be nullable, due to a "
-            'nullability hint',
-        kind: NullabilityFixKind.makeTypeNullableDueToHint,
-        traces: isNotNull, edits: (List edits) {
-      expect(edits, hasLength(2));
-      var editsByDescription = {for (var edit in edits) edit.description: edit};
-      assertEdit(
-          edit: editsByDescription['Change to /*!*/ hint'],
-          offset: content.indexOf(textToRemove),
-          length: textToRemove.length,
-          replacement: '/*!*/');
-      assertEdit(
-          edit: editsByDescription['Remove /*?*/ hint'],
-          offset: content.indexOf(textToRemove),
-          length: textToRemove.length,
-          replacement: '');
-      return true;
-    });
-  }
-
-  Future test_increment_nullable_result() async {
-    var unit = await buildInfoForSingleTestFile('''
-abstract class C {
-  C/*?*/ operator+(int i);
-}
-void f(C/*!*/ a) {
-  a++;
-}
-''', migratedContent: '''
-abstract class C {
-  C/*?*/ operator+(int? i);
-}
-void f(C/*!*/ a) {
-  a++;
-}
-''');
-    var operator = '++';
-    var operatorOffset = unit.content!.indexOf(operator);
-    var region =
-        unit.regions.where((region) => region.offset == operatorOffset).single;
-    assertRegion(
-        region: region,
-        length: operator.length,
-        explanation: 'Compound assignment has bad combined type',
-        kind: NullabilityFixKind.compoundAssignmentHasBadCombinedType,
-        edits: isEmpty);
-  }
-
-  Future test_increment_nullable_source() async {
-    var unit = await buildInfoForSingleTestFile('''
-void f(int/*?*/ a) {
-  a++;
-}
-''', migratedContent: '''
-void f(int/*?*/ a) {
-  a++;
-}
-''');
-    var operator = '++';
-    var operatorOffset = unit.content!.indexOf(operator);
-    var region =
-        unit.regions.where((region) => region.offset == operatorOffset).single;
-    assertRegion(
-        region: region,
-        length: operator.length,
-        explanation: 'Compound assignment has nullable source',
-        kind: NullabilityFixKind.compoundAssignmentHasNullableSource,
-        edits: isEmpty);
-  }
-
-  Future test_insertedRequired_fieldFormal() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-import 'package:meta/meta.dart';
-class C {
-  int level;
-  int level2;
-  C({this.level}) : this.level2 = level + 1;
-}
-''', migratedContent: '''
-import 'package:meta/meta.dart';
-class C {
-  int  level;
-  int  level2;
-  C({required this.level}) : this.level2 = level + 1;
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 77,
-        length: 9,
-        explanation: "Add 'required' keyword to parameter 'level' in 'C.'",
-        kind: NullabilityFixKind.addRequired);
-    assertEdit(
-        edit: edits[0], offset: 75, length: 0, replacement: '@required ');
-  }
-
-  Future test_insertedRequired_fieldFormal_hint() async {
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  int level;
-  int level2;
-  C({this.level}) : this.level2 = level + 1;
-}
-''', migratedContent: '''
-class C {
-  int  level;
-  int  level2;
-  C({required this.level}) : this.level2 = level + 1;
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 44,
-        length: 9,
-        explanation: "Add 'required' keyword to parameter 'level' in 'C.'",
-        kind: NullabilityFixKind.addRequired);
-    assertEdit(
-        edit: edits[0], offset: 42, length: 0, replacement: '/*required*/ ');
-  }
-
-  Future test_insertedRequired_parameter() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-import 'package:meta/meta.dart';
-class C {
-  int level = 0;
-  bool f({int lvl}) => lvl >= level;
-}
-''', migratedContent: '''
-import 'package:meta/meta.dart';
-class C {
-  int  level = 0;
-  bool  f({required int  lvl}) => lvl >= level;
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 72,
-        length: 9,
-        explanation: "Add 'required' keyword to parameter 'lvl' in 'C.f'",
-        kind: NullabilityFixKind.addRequired);
-    assertEdit(
-        edit: edits[0], offset: 70, length: 0, replacement: '@required ');
-  }
-
-  Future test_insertedRequired_parameter_hint() async {
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  int level = 0;
-  bool f({int lvl}) => lvl >= level;
-}
-''', migratedContent: '''
-class C {
-  int  level = 0;
-  bool  f({required int  lvl}) => lvl >= level;
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertRegion(
-        region: region,
-        offset: 39,
-        length: 9,
-        explanation: "Add 'required' keyword to parameter 'lvl' in 'C.f'",
-        kind: NullabilityFixKind.addRequired);
-    assertEdit(
-        edit: edits[0], offset: 37, length: 0, replacement: '/*required*/ ');
-  }
-
-  Future test_insertedRequired_parameter_metaPrefixed() async {
-    addMetaPackage();
-    var unit = await buildInfoForSingleTestFile('''
-import 'package:meta/meta.dart' as meta;
-class C {
-  int level = 0;
-  bool f({int lvl}) => lvl >= level;
-}
-''', migratedContent: '''
-import 'package:meta/meta.dart' as meta;
-class C {
-  int  level = 0;
-  bool  f({required int  lvl}) => lvl >= level;
-}
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(1));
-    var region = regions[0];
-    var edits = region.edits;
-    assertEdit(
-        edit: edits[0], offset: 78, length: 0, replacement: '@meta.required ');
-  }
-
-  Future test_insertParens() async {
-    var originalContent = '''
-class C {
-  C operator+(C c) => null;
-}
-C/*!*/ _f(C c) => c + c;
-''';
-    var migratedContent = '''
-class C {
-  C? operator+(C? c) => null;
-}
-C/*!*/ _f(C  c) => (c + c)!;
-''';
-    var unit = await buildInfoForSingleTestFile(originalContent,
-        migratedContent: migratedContent);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(4));
-    assertRegion(
-        region: regions[0],
-        offset: migratedContent.indexOf('? operator'),
-        length: 1,
-        explanation: "Changed type 'C' to be nullable");
-    assertRegion(
-        region: regions[1],
-        offset: migratedContent.indexOf('? c'),
-        length: 1,
-        explanation: "Changed type 'C' to be nullable");
-    assertRegion(
-        region: regions[2],
-        offset: migratedContent.indexOf('/*!*/'),
-        length: 5,
-        explanation: "Type 'C' was not made nullable due to a hint",
-        kind: NullabilityFixKind.typeNotMadeNullableDueToHint);
-    assertRegion(
-        region: regions[3],
-        offset: migratedContent.indexOf('!;'),
-        length: 1,
-        explanation: 'Added a non-null assertion to nullable expression',
-        kind: NullabilityFixKind.checkExpression);
-  }
-
-  Future test_method_name_change() async {
-    addPackageFile('collection', 'collection.dart', '');
-    var content = '''
-import 'package:collection/collection.dart';
-
-int f(List values, int/*?*/ x)
-    => values.firstWhere((i) => (i + x).isEven,
-        orElse: () => null);
-''';
-    var migratedContent = '''
-import 'package:collection/collection.dart';
-
-int? f(List  values, int/*?*/ x)
-    => values.firstWherefirstWhereOrNull((i) => (i + x!).isEven,
-        orElse: () => null);
-''';
-    await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent, removeViaComments: false);
-  }
-
-  void test_nullAwareAssignment_remove() async {
-    var unit = await buildInfoForSingleTestFile('''
-int f(int/*!*/ x, int y) => x ??= y;
-''', migratedContent: '''
-int  f(int/*!*/ x, int? y) => x ??= y;
-''', warnOnWeakCode: false, removeViaComments: false);
-    var codeToRemove = ' ??= y';
-    var removalOffset = unit.content!.indexOf(codeToRemove);
-    var region =
-        unit.regions.where((region) => region.offset == removalOffset).single;
-    assertRegion(
-        region: region,
-        length: codeToRemove.length,
-        explanation:
-            'Removed a null-aware assignment, because the target cannot be '
-            'null',
-        kind: NullabilityFixKind.removeDeadCode,
-        edits: isEmpty);
-  }
-
-  void test_nullAwareAssignment_unnecessaryInStrongMode() async {
-    var unit = await buildInfoForSingleTestFile('''
-int f(int/*!*/ x, int y) => x ??= y;
-''', migratedContent: '''
-int  f(int/*!*/ x, int? y) => x ??= y!;
-''', warnOnWeakCode: true);
-    var operator = '??=';
-    var operatorOffset = unit.content!.indexOf(operator);
-    var region =
-        unit.regions.where((region) => region.offset == operatorOffset).single;
-    assertRegion(
-        region: region,
-        length: operator.length,
-        explanation:
-            'Null-aware assignment will be unnecessary in strong checking mode',
-        kind: NullabilityFixKind.nullAwareAssignmentUnnecessaryInStrongMode,
-        edits: isEmpty);
-  }
-
-  void test_nullAwarenessUnnecessaryInStrongMode() async {
-    var unit = await buildInfoForSingleTestFile('''
-int f(String/*!*/ s) => s?.length;
-''', migratedContent: '''
-int  f(String/*!*/ s) => s?.length;
-''', warnOnWeakCode: true);
-    var question = '?';
-    var questionOffset = unit.content!.indexOf(question);
-    var region =
-        unit.regions.where((region) => region.offset == questionOffset).single;
-    assertRegion(
-        region: region,
-        length: question.length,
-        explanation:
-            'Null-aware access will be unnecessary in strong checking mode',
-        kind: NullabilityFixKind.nullAwarenessUnnecessaryInStrongMode,
-        edits: isEmpty);
-  }
-
-  Future test_nullCheck_dueToHint() async {
-    var content = 'int f(int/*?*/ x) => x/*!*/;';
-    var migratedContent = 'int  f(int/*?*/ x) => x/*!*/;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(4));
-    assertRegionPair(regions, 0,
-        kind: NullabilityFixKind.makeTypeNullableDueToHint);
-    var hintText = '/*!*/';
-    assertRegionPair(regions, 2,
-        offset1: migratedContent.indexOf(hintText),
-        length1: 2,
-        offset2: migratedContent.indexOf(hintText) + 3,
-        length2: 2,
-        explanation: 'Accepted a null check hint',
-        kind: NullabilityFixKind.checkExpressionDueToHint,
-        traces: isNotEmpty,
-        edits: (List edits) => assertEdit(
-            edit: edits.single,
-            offset: content.indexOf(hintText),
-            length: hintText.length,
-            replacement: ''));
-  }
-
-  Future test_nullCheck_onMemberAccess() async {
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  int value;
-  C([this.value]);
-  void f() {
-    value.sign;
-  }
-}
-''', migratedContent: '''
-class C {
-  int? value;
-  C([this.value]);
-  void f() {
-    value!.sign;
-  }
-}
-''');
-    var regions = unit.regions;
-    expect(regions, hasLength(2));
-    // regions[0] is `int?`.
-    var region = regions[1];
-    var edits = region.edits;
-    assertRegion(
-        region: regions[1],
-        offset: 65,
-        explanation: 'Added a non-null assertion to nullable expression',
-        kind: NullabilityFixKind.checkExpression);
-    assertEdit(edit: edits[0], offset: 64, length: 0, replacement: '/*!*/');
-  }
-
-  Future test_parameter_fromOverriddenField_explicit() async {
-    var unit = await buildInfoForSingleTestFile('''
-class A {
-  int m;
-}
-class B extends A {
-  void set m(Object p) {}
-}
-void f(A a) => a.m = null;
-''', migratedContent: '''
-class A {
-  int? m;
-}
-class B extends A {
-  void set m(Object? p) {}
-}
-void f(A  a) => a.m = null;
-''');
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(2));
-    assertRegion(
-        region: regions[0],
-        offset: 15,
-        explanation: "Changed type 'int' to be nullable");
-    assertRegion(
-        region: regions[1],
-        offset: 61,
-        explanation: "Changed type 'Object' to be nullable");
-
-    expect(regions[0].traces, hasLength(1));
-    var trace = regions[0].traces.first;
-    expect(trace.description, 'Nullability reason');
-    var entries = trace.entries;
-    expect(entries, hasLength(2));
-    assertTraceEntry(unit, entries[0], 'A.m', unit.content!.indexOf('int?'),
-        contains('A.m (test.dart:2:3)'));
-  }
-
-  Future test_removal_handles_offsets_correctly() async {
-    var originalContent = '''
-void f(num n, int/*?*/ i) {
-  if (n is! int) return;
-  print((n as int).isEven);
-  print(i + 1);
-}
-''';
-    // Note: even though `as int` is removed, it still shows up in the
-    // preview, since we show deleted text.
-    var migratedContent = '''
-void f(num? n, int/*?*/ i) {
-  if (n is! int ) return;
-  print((n as int).isEven);
-  print(i! + 1);
-}
-''';
-    var unit = await buildInfoForSingleTestFile(originalContent,
-        migratedContent: migratedContent, removeViaComments: false);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(5));
-    assertRegionPair(regions, 1,
-        kind: NullabilityFixKind.makeTypeNullableDueToHint);
-    assertRegion(
-        region: regions[3],
-        offset: migratedContent.indexOf(' as int'),
-        length: ' as int'.length,
-        explanation: 'Discarded a downcast that is now unnecessary',
-        kind: NullabilityFixKind.removeAs);
-    assertRegion(
-        region: regions[4],
-        offset: migratedContent.indexOf('! + 1'),
-        explanation: 'Added a non-null assertion to nullable expression',
-        kind: NullabilityFixKind.checkExpression);
-  }
-
-  Future test_returnDetailTarget() async {
-    var unit = await buildInfoForSingleTestFile('''
-String g() {
-  return 1 == 2 ? "Hello" : null;
-}
-''', migratedContent: '''
-String? g() {
-  return 1 == 2 ? "Hello" : null;
-}
-''');
-    assertInTargets(targets: unit.targets, offset: 7, length: 1); // "g"
-    var regions = unit.regions;
-    expect(regions, hasLength(1));
-    assertRegion(
-        region: regions[0],
-        offset: 6,
-        explanation: "Changed type 'String' to be nullable");
-  }
-
-  Future test_suspicious_cast() async {
-    var content = '''
-int f(Object o) {
-  if (o is! String) return 0;
-  return o;
-}
-''';
-    var migratedContent = '''
-int  f(Object? o) {
-  if (o is! String ) return 0;
-  return o /* no valid migration */;
-}
-''';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = getNonInformativeRegions(unit.regions);
-    var regionTarget = '/* no valid migration */';
-    var offset = migratedContent.indexOf(regionTarget);
-    var region = regions.where((region) => region.offset == offset).single;
-    assertRegion(
-        region: region,
-        offset: offset,
-        length: regionTarget.length,
-        kind: NullabilityFixKind.noValidMigrationForNull,
-        edits: isEmpty);
-  }
-
-  Future test_trace_constructor_named() async {
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  C.named(int i) {}
-}
-void f() {
-  C.named(null);
-}
-''', migratedContent: '''
-class C {
-  C.named(int? i) {}
-}
-void f() {
-  C.named(null);
-}
-''');
-    var region = unit.regions
-        .where((info) => info.offset == unit.content!.indexOf('? i) {}'))
-        .single;
-    expect(region.traces, hasLength(1));
-    var trace = region.traces.single;
-    expect(trace.description, 'Nullability reason');
-    var entries = trace.entries;
-    assertTraceEntry(
-        unit,
-        entries[0],
-        'C.named',
-        unit.content!.indexOf('int? i) {}'),
-        contains('parameter 0 of C.named'));
-  }
-
-  Future test_trace_constructor_unnamed() async {
-    var unit = await buildInfoForSingleTestFile('''
-class C {
-  C(int i) {}
-}
-void f() {
-  C(null);
-}
-''', migratedContent: '''
-class C {
-  C(int? i) {}
-}
-void f() {
-  C(null);
-}
-''');
-    var region = unit.regions
-        .where((info) => info.offset == unit.content!.indexOf('? i) {}'))
-        .single;
-    expect(region.traces, hasLength(1));
-    var trace = region.traces.single;
-    expect(trace.description, 'Nullability reason');
-    var entries = trace.entries;
-    assertTraceEntry(
-        unit,
-        entries[0],
-        'C.',
-        unit.content!.indexOf('int? i) {}'),
-        contains('parameter 0 of C.'));
-  }
-
-  Future test_trace_deadCode() async {
-    var unit = await buildInfoForSingleTestFile('''
-void f(int/*!*/ i) {
-  if (i == null) return;
-}
-''', migratedContent: '''
-void f(int/*!*/ i) {
-  /* if (i == null) return; */
-}
-''');
-    var region = unit.regions
-        .where(
-            (regionInfo) => regionInfo.offset == unit.content!.indexOf('/* if'))
-        .single;
-    expect(region.traces, hasLength(1));
-    var trace = region.traces.single;
-    expect(trace.description, 'Non-nullability reason');
-    var entries = trace.entries;
-    expect(entries, hasLength(2));
-    // Entry 0 is the nullability of f's argument
-    assertTraceEntry(unit, entries[0], 'f', unit.content!.indexOf('int'),
-        contains('parameter 0 of f'));
-    // Entry 1 is the edge from f's argument to never, due to the `/*!*/` hint.
-    assertTraceEntry(unit, entries[1], 'f', unit.content!.indexOf('int'),
-        'explicitly hinted to be non-nullable');
-  }
-
-  Future test_trace_extension_unnamed() async {
-    var unit = await buildInfoForSingleTestFile('''
-extension on String {
-  m(int i) {}
-}
-void f() {
-  "".m(null);
-}
-''', migratedContent: '''
-extension on String  {
-  m(int? i) {}
-}
-void f() {
-  "".m(null);
-}
-''');
-    var region = unit.regions
-        .where((info) => info.offset == unit.content!.indexOf('? i) {}'))
-        .single;
-    expect(region.traces, hasLength(1));
-    var trace = region.traces.single;
-    expect(trace.description, 'Nullability reason');
-    var entries = trace.entries;
-    assertTraceEntry(
-        unit,
-        entries[0],
-        '.m',
-        unit.content!.indexOf('int? i) {}'),
-        contains('parameter 0 of .m'));
-  }
-
-  Future test_trace_nullableType() async {
-    var unit = await buildInfoForSingleTestFile('''
-void _f(int i) {} // _f
-void _g(int i) { // _g
-  _f(i);
-}
-void h() {
-  _g(null);
-}
-''', migratedContent: '''
-void _f(int? i) {} // _f
-void _g(int? i) { // _g
-  _f(i);
-}
-void h() {
-  _g(null);
-}
-''');
-    var region = unit.regions
-        .where((regionInfo) =>
-            regionInfo.offset == unit.content!.indexOf('? i) {} // _f'))
-        .single;
-    expect(region.traces, hasLength(1));
-    var trace = region.traces.single;
-    expect(trace.description, 'Nullability reason');
-    var entries = trace.entries;
-    expect(entries, hasLength(6));
-    // Entry 0 is the nullability of _f's argument
-    assertTraceEntry(
-        unit,
-        entries[0],
-        '_f',
-        unit.content!.indexOf('int? i) {} // _f'),
-        contains('parameter 0 of _f'),
-        hintActions: {
-          HintActionKind.addNullableHint,
-          HintActionKind.addNonNullableHint
-        });
-
-    // Entry 1 is the edge from _g's argument to _f's argument, due to g's call
-    // to _f.
-    assertTraceEntry(
-        unit, entries[1], '_g', unit.content!.indexOf('i);'), 'data flow');
-    // Entry 2 is the nullability of _g's argument
-    assertTraceEntry(unit, entries[2], '_g',
-        unit.content!.indexOf('int? i) { // _g'), contains('parameter 0 of _g'),
-        hintActions: {
-          HintActionKind.addNullableHint,
-          HintActionKind.addNonNullableHint
-        });
-    // Entry 3 is the edge from null to _g's argument, due to h's call to _g.
-    assertTraceEntry(
-        unit, entries[3], 'h', unit.content!.indexOf('null'), 'data flow');
-    // Entry 4 is the nullability of the null literal.
-    assertTraceEntry(unit, entries[4], 'h', unit.content!.indexOf('null'),
-        contains('null literal'));
-    // Entry 5 is the edge from always to null.
-    // TODO(paulberry): this edge provides no additional useful information and
-    // shouldn't be included in the trace.
-    assertTraceEntry(unit, entries[5], 'h', unit.content!.indexOf('null'),
-        'literal expression');
-  }
-
-  Future test_trace_nullCheck() async {
-    var unit = await buildInfoForSingleTestFile('int f(int/*?*/ i) => i + 1;',
-        migratedContent: 'int  f(int/*?*/ i) => i! + 1;');
-    var region = unit.regions
-        .where(
-            (regionInfo) => regionInfo.offset == unit.content!.indexOf('! +'))
-        .single;
-    expect(region.traces, hasLength(1));
-    var trace = region.traces.single;
-    expect(trace.description, 'Nullability reason');
-    var entries = trace.entries;
-    expect(entries, hasLength(2));
-    // Entry 0 is the nullability of the type of i.
-    assertTraceEntry(unit, entries[0], 'f', unit.content!.indexOf('int/*?*/'),
-        contains('parameter 0 of f'));
-    // Entry 1 is the edge from always to the type of i.
-    // TODO(paulberry): this edge provides no additional useful information and
-    // shouldn't be included in the trace.
-    assertTraceEntry(unit, entries[1], 'f', unit.content!.indexOf('int/*?*/'),
-        'explicitly hinted to be nullable');
-  }
-
-  Future test_trace_nullCheck_notNullableReason() async {
-    var unit = await buildInfoForSingleTestFile('''
-void f(int i) { // f
-  assert(i != null);
-}
-void g(int i) { // g
-  f(i); // call f
-}
-void h(int/*?*/ i) {
-  g(i);
-}
-''', migratedContent: '''
-void f(int  i) { // f
-  assert(i != null);
-}
-void g(int  i) { // g
-  f(i); // call f
-}
-void h(int/*?*/ i) {
-  g(i!);
-}
-''');
-    var region = unit.regions
-        .where((regionInfo) => regionInfo.offset == unit.content!.indexOf('!)'))
-        .single;
-    expect(region.traces, hasLength(2));
-    // Trace 0 is the nullability reason; we don't care about that right now.
-    // Trace 1 is the non-nullability reason.
-    var trace = region.traces[1];
-    expect(trace.description, 'Non-nullability reason');
-    var entries = trace.entries;
-    expect(entries, hasLength(4));
-    // Entry 0 is the nullability of g's argument
-    assertTraceEntry(unit, entries[0], 'g',
-        unit.content!.indexOf('int  i) { // g'), contains('parameter 0 of g'));
-    // Entry 1 is the edge from g's argument to f's argument, due to g's call to
-    // f.
-    assertTraceEntry(unit, entries[1], 'g',
-        unit.content!.indexOf('i); // call f'), 'data flow');
-    // Entry 2 is the nullability of f's argument
-    assertTraceEntry(unit, entries[2], 'f',
-        unit.content!.indexOf('int  i) { // f'), contains('parameter 0 of f'));
-    // Entry 3 is the edge f's argument to never, due to the assert.
-    assertTraceEntry(unit, entries[3], 'f', unit.content!.indexOf('assert'),
-        'value asserted to be non-null');
-  }
-
-  Future test_trace_nullCheckHint() async {
-    var unit = await buildInfoForSingleTestFile('int f(int/*?*/ i) => i/*!*/;',
-        migratedContent: 'int  f(int/*?*/ i) => i/*!*/;');
-    var region = unit.regions
-        .where(
-            (regionInfo) => regionInfo.offset == unit.content!.indexOf('/*!*/'))
-        .single;
-    expect(region.traces, hasLength(1));
-    var trace = region.traces.single;
-    expect(trace.description, 'Reason');
-    expect(trace.entries, hasLength(1));
-    assertTraceEntry(unit, trace.entries.single, 'f',
-        unit.content!.indexOf('i/*!*/'), 'Null check hint');
-  }
-
-  Future test_trace_refers_to_variable_initializer() async {
-    var unit = await buildInfoForSingleTestFile('''
-void f(int/*?*/ i) {
-  var x = [i];
-  int y = x[0];
-}
-''', migratedContent: '''
-void f(int/*?*/ i) {
-  var x = [i];
-  int? y = x[0];
-}
-''');
-    var region = unit.regions
-        .where(
-            (regionInfo) => regionInfo.offset == unit.content!.indexOf('? y'))
-        .single;
-    expect(region.traces, hasLength(1));
-    var trace = region.traces.single;
-    expect(trace.description, 'Nullability reason');
-    var entries = trace.entries;
-    expect(entries, hasLength(8));
-    // Entry 0 is the nullability of y
-    assertTraceEntry(unit, entries[0], 'f.y', unit.content!.indexOf('int? y'),
-        contains('f.y'));
-    // Entry 1 is the edge from the list element type of x to y, due to array
-    // indexing.
-    assertTraceEntry(unit, entries[1], 'f.y', unit.content!.indexOf('x[0]'),
-        contains('data flow'));
-    // Entry 2 is the nullability of the implicit list element type of x
-    assertTraceEntry(unit, entries[2], 'f.x', unit.content!.indexOf('x ='),
-        contains('type argument 0 of f.x'));
-    // Entry 3 is the edge from the explicit list element type on the RHS of x
-    // to the implicit list element type on the LHS of x
-    assertTraceEntry(unit, entries[3], 'f.x',
-        unit.content!.indexOf('[i]'), contains('data flow'));
-    // Entry 4 is the explicit list element type on the RHS of x
-    assertTraceEntry(unit, entries[4], 'f.x', unit.content!.indexOf('int?>[i]'),
-        contains('list element type'));
-    // Entry 5 is the edge from the parameter i to the list literal
-    assertTraceEntry(unit, entries[5], 'f.x', unit.content!.indexOf('i]'),
-        contains('data flow'));
-    // Entry 6 is the nullability of the parameter i
-    assertTraceEntry(unit, entries[6], 'f', unit.content!.indexOf('int/*?*/'),
-        contains('parameter 0 of f'));
-    // Entry 7 is the edge due to the explicit /*?*/ hint
-    assertTraceEntry(unit, entries[7], 'f', unit.content!.indexOf('int/*?*/'),
-        contains('explicitly hinted to be nullable'));
-  }
-
-  Future test_trace_substitutionNode() async {
-    var unit = await buildInfoForSingleTestFile('''
-class C {}
-
-C c;
-
-Map x = {};
-String/*!*/ y = x[0];
-''', migratedContent: '''
-class C {}
-
-C? c;
-
-Map  x = {};
-String/*!*/ y = x[0]!;
-''');
-    var region = unit.regions
-        .where((regionInfo) => regionInfo.offset == unit.content!.indexOf('!;'))
-        .single;
-    // The "why nullable" node associated with adding the `!` is a substitution
-    // node, and we don't currently generate a trace for a substitution node.
-    // TODO(paulberry): fix this.
-    // We do, however, generate a trace for "why not nullable".
-    expect(region.traces, hasLength(1));
-    expect(region.traces[0].description, 'Non-nullability reason');
-  }
-
-  Future test_type_made_nullable() async {
-    var unit = await buildInfoForSingleTestFile('''
-String g() => 1 == 2 ? "Hello" : null;
-''', migratedContent: '''
-String? g() => 1 == 2 ? "Hello" : null;
-''');
-    assertInTargets(targets: unit.targets, offset: 7, length: 1); // "g"
-    var regions = unit.regions;
-    expect(regions, hasLength(1));
-    assertRegion(
-        region: regions[0],
-        offset: 6,
-        explanation: "Changed type 'String' to be nullable");
-  }
-
-  Future test_type_made_nullable_due_to_hint() async {
-    var content = 'int/*?*/ x = 0;';
-    var migratedContent = 'int/*?*/ x = 0;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.fixRegions;
-    expect(regions, hasLength(2));
-    var textToRemove = '/*?*/';
-    assertRegionPair(regions, 0,
-        offset1: migratedContent.indexOf(textToRemove),
-        length1: 2,
-        offset2: migratedContent.indexOf(textToRemove) + 3,
-        length2: 2,
-        explanation:
-            "Changed type 'int' to be nullable, due to a nullability hint",
-        kind: NullabilityFixKind.makeTypeNullableDueToHint,
-        traces: isNotNull, edits: (List edits) {
-      expect(edits, hasLength(2));
-      var editsByDescription = {for (var edit in edits) edit.description: edit};
-      assertEdit(
-          edit: editsByDescription['Change to /*!*/ hint'],
-          offset: content.indexOf(textToRemove),
-          length: textToRemove.length,
-          replacement: '/*!*/');
-      assertEdit(
-          edit: editsByDescription['Remove /*?*/ hint'],
-          offset: content.indexOf(textToRemove),
-          length: textToRemove.length,
-          replacement: '');
-      return true;
-    });
-  }
-
-  Future test_type_not_made_nullable() async {
-    var unit = await buildInfoForSingleTestFile('int i = 0;',
-        migratedContent: 'int  i = 0;');
-    var region = unit.regions
-        .where(
-            (regionInfo) => regionInfo.offset == unit.content!.indexOf('  i'))
-        .single;
-    expect(region.length, 1);
-    expect(region.lineNumber, 1);
-    expect(region.explanation, "Type 'int' was not made nullable");
-    expect(region.edits.map((edit) => edit.description).toSet(),
-        {'Add /*?*/ hint', 'Add /*!*/ hint', 'Add late hint'});
-    var trace = region.traces.first;
-    expect(trace.description, 'Non-nullability reason');
-    var entries = trace.entries;
-    expect(entries, hasLength(1));
-    assertTraceEntry(unit, entries[0], 'i', unit.content!.indexOf('int'),
-        'No reason found to make nullable');
-    expect(region.kind, NullabilityFixKind.typeNotMadeNullable);
-  }
-
-  Future test_type_not_made_nullable_due_to_hint() async {
-    var content = 'int/*!*/ i = 0;';
-    var migratedContent = 'int/*!*/ i = 0;';
-    var unit = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    var regions = unit.regions;
-    expect(regions, hasLength(1));
-    var textToRemove = '/*!*/';
-    assertRegion(
-        region: regions[0],
-        offset: migratedContent.indexOf(textToRemove),
-        length: 5,
-        explanation: "Type 'int' was not made nullable due to a hint",
-        kind: NullabilityFixKind.typeNotMadeNullableDueToHint,
-        traces: isNotNull,
-        edits: (List edits) {
-          expect(edits, hasLength(2));
-          var editsByDescription = {
-            for (var edit in edits) edit.description: edit
-          };
-          assertEdit(
-              edit: editsByDescription['Change to /*?*/ hint'],
-              offset: content.indexOf(textToRemove),
-              length: textToRemove.length,
-              replacement: '/*?*/');
-          assertEdit(
-              edit: editsByDescription['Remove /*!*/ hint'],
-              offset: content.indexOf(textToRemove),
-              length: textToRemove.length,
-              replacement: '');
-          return true;
-        });
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/instrumentation_renderer_test.dart b/pkg/nnbd_migration/test/front_end/instrumentation_renderer_test.dart
deleted file mode 100644
index 452d4d05099d..000000000000
--- a/pkg/nnbd_migration/test/front_end/instrumentation_renderer_test.dart
+++ /dev/null
@@ -1,55 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/instrumentation_renderer.dart';
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/path_mapper.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'nnbd_migration_test_base.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(InstrumentationRendererTest);
-  });
-}
-
-@reflectiveTest
-class InstrumentationRendererTest extends NnbdMigrationTestBase {
-  /// Render the instrumentation view for [files].
-  Future renderViewForTestFiles(
-      {bool applied = false, bool needsRerun = false}) async {
-    var files = {convertPath('$projectPath/lib/a.dart'): 'int a = null;'};
-    await buildInfoForTestFiles(files, includedRoot: projectPath);
-    var migrationInfo =
-        MigrationInfo(infos, {}, resourceProvider.pathContext, projectPath);
-    var instrumentationRenderer = InstrumentationRenderer(
-        migrationInfo, PathMapper(resourceProvider), applied, needsRerun);
-    return instrumentationRenderer.render();
-  }
-
-  Future test_appliedStyle() async {
-    var renderedView = await renderViewForTestFiles(applied: true);
-    // harmless space in class list due to other potential classes here.
-    expect(renderedView, contains(''));
-  }
-
-  Future test_navigation_containsRoot() async {
-    var renderedView = await renderViewForTestFiles();
-    // harmless space in class list due to other potential classes here.
-    expect(renderedView, contains('
$projectPath
'));
-  }
-
-  Future test_needsRerunStyle() async {
-    var renderedView = await renderViewForTestFiles(needsRerun: true);
-    expect(renderedView, contains(''));
-  }
-
-  Future test_notAppliedStyle() async {
-    var renderedView = await renderViewForTestFiles(applied: false);
-    // harmless space in class list due to other potential classes here.
-    expect(renderedView, contains(''));
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/migration_info_test.dart b/pkg/nnbd_migration/test/front_end/migration_info_test.dart
deleted file mode 100644
index ad989db4d907..000000000000
--- a/pkg/nnbd_migration/test/front_end/migration_info_test.dart
+++ /dev/null
@@ -1,164 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer_plugin/protocol/protocol_common.dart';
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/offset_mapper.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(UnitInfoTest);
-  });
-}
-
-@reflectiveTest
-class UnitInfoTest {
-  static bool get _areAssertsEnabled {
-    try {
-      assert(false);
-      return false;
-    } on AssertionError {
-      return true;
-    }
-  }
-
-  void test_hadDiskContent_different() {
-    final unitInfo = UnitInfo('/foo.dart');
-    unitInfo.diskContent = 'abcd';
-    expect(unitInfo.hadDiskContent('dcba'), false);
-  }
-
-  void test_hadDiskContent_nullContentMatchesEmptyString() {
-    final unitInfo = UnitInfo('/foo.dart');
-    unitInfo.diskContent = '';
-    expect(unitInfo.hadDiskContent(null), true);
-    expect(unitInfo.hadDiskContent(''), true);
-  }
-
-  void test_hadDiskContent_nullMatchesEmptyStringContent() {
-    final unitInfo = UnitInfo('/foo.dart');
-    unitInfo.diskContent = null;
-    expect(unitInfo.hadDiskContent(null), true);
-    expect(unitInfo.hadDiskContent(''), true);
-  }
-
-  void test_hadDiskContent_theSame() {
-    final unitInfo = UnitInfo('/foo.dart');
-    unitInfo.diskContent = 'abcd';
-    expect(unitInfo.hadDiskContent('abcd'), true);
-  }
-
-  void test_hadDiskContent_usedBeforeSet_assertsDisabled() {
-    if (_areAssertsEnabled) return;
-
-    final unitInfo = UnitInfo('/foo.dart');
-    expect(unitInfo.hadDiskContent(''), false);
-  }
-
-  void test_hadDiskContent_usedBeforeSet_assertsEnabled() {
-    if (!_areAssertsEnabled) return;
-
-    final unitInfo = UnitInfo('/foo.dart');
-    expect(() => unitInfo.hadDiskContent(''), throwsA(isA()));
-  }
-
-  void test_handleSourceEdit() {
-    final unitInfo = UnitInfo('/foo.dart');
-    unitInfo.content = 'int  x;';
-    unitInfo.migrationOffsetMapper =
-        OffsetMapper.forEdits([SourceEdit('int'.length, 0, ' ')]);
-    unitInfo.handleSourceEdit(SourceEdit('int'.length, 0, '/*?*/'));
-    expect(unitInfo.content, 'int/*?*/  x;');
-    expect(unitInfo.offsetMapper.map('in'.length), 'in'.length);
-    expect(unitInfo.offsetMapper.map('int'.length), 'int/*?*/'.length);
-    expect(unitInfo.offsetMapper.map('int x'.length), 'int/*?*/  x'.length);
-    expect(unitInfo.diskChangesOffsetMapper.map('in'.length), 'in'.length);
-    expect(
-        unitInfo.diskChangesOffsetMapper.map('int'.length), 'int/*?*/'.length);
-    expect(unitInfo.diskChangesOffsetMapper.map('int x'.length),
-        'int/*?*/ x'.length);
-  }
-
-  void test_handleSourceEdit_deletion() {
-    final unitInfo = UnitInfo('/foo.dart');
-    unitInfo.content = 'int/*!*/ x = null!;';
-    unitInfo.migrationOffsetMapper =
-        OffsetMapper.forEdits([SourceEdit('int/*!*/ x = null'.length, 0, '!')]);
-    unitInfo.handleSourceEdit(SourceEdit('int'.length, '/*!*/'.length, ''));
-    expect(unitInfo.content, 'int x = null!;');
-    expect(unitInfo.offsetMapper.map('in'.length), 'in'.length);
-    expect(unitInfo.offsetMapper.map('int/*!*/ x'.length), 'int x'.length);
-    expect(unitInfo.offsetMapper.map('int/*!*/ x = null'.length),
-        'int x = null'.length);
-    expect(unitInfo.offsetMapper.map('int/*!*/ x = null;'.length),
-        'int x = null!;'.length);
-    expect(unitInfo.diskChangesOffsetMapper.map('in'.length), 'in'.length);
-    expect(
-        unitInfo.diskChangesOffsetMapper.map('int/*!*/'.length), 'int'.length);
-    expect(unitInfo.diskChangesOffsetMapper.map('int/*!*/ x'.length),
-        'int x'.length);
-  }
-
-  void test_handleSourceEdit_regression_41894() {
-    final unitInfo = UnitInfo('/foo.dart');
-    unitInfo.content = 'C > >  x;';
-    unitInfo.migrationOffsetMapper = OffsetMapper.forEdits([
-      SourceEdit('C'.length, 0, ' '),
-      SourceEdit('C>'.length, 0, ' '),
-      SourceEdit('C>>'.length, 0, ' ')
-    ]);
-    unitInfo.handleSourceEdit(SourceEdit('C'.length, 0, '/*?*/'));
-    unitInfo.handleSourceEdit(SourceEdit('C>'.length, 0, '/*?*/'));
-    unitInfo.handleSourceEdit(SourceEdit('C>>'.length, 0, '/*?*/'));
-
-    // Before 41894 was fixed, this would produce:
-    //
-    // `C/*?*/ >/*/*?*/?*/ >  x;`
-    //
-    // because the diskChangesOffsetMapper contained an insertion that was
-    // mapped on the post-migrated content mapper instead of the disk changes
-    // content mapper.
-    //
-    // This essentially meant that migrationInfo thought that the second to last
-    // /*?*/ hint was added 3 characters too late in the file, (that's the
-    // *migrated* offset of the third insertion), and so making an edit within
-    // those three characters was mapped five characters too early. In this
-    // example the fourth edit was presumed, from the offset mapper logic, to
-    // be an insertion before the second-to-last insertion when it is in fact
-    // insert after it.
-    expect(unitInfo.content, 'C/*?*/ >/*?*/ >/*?*/  x;');
-
-    // Rigorous offset mapper testing.
-    expect(unitInfo.offsetMapper.map('C'.length),
-        'C/*?*/'.length);
-    expect(unitInfo.offsetMapper.map('C>'.length),
-        'C/*?*/ >/*?*/'.length);
-    expect(unitInfo.offsetMapper.map('C>>'.length),
-        'C/*?*/ >/*?*/ /*?*/>'.length);
-    expect(unitInfo.offsetMapper.map('C>> '.length),
-        'C/*?*/ >/*?*/ /*?*/>  '.length);
-    expect(unitInfo.offsetMapper.map('C>> x'.length),
-        'C/*?*/ >/*?*/ /*?*/>  x'.length);
-    expect(
-        unitInfo.diskChangesOffsetMapper.map('C'.length),
-        'C/*?*/'.length);
-    expect(unitInfo.diskChangesOffsetMapper.map('C>'.length),
-        'C/*?*/>/*?*/'.length);
-    expect(unitInfo.diskChangesOffsetMapper.map('C>>'.length),
-        'C/*?*/>/*?*//*?*/>'.length);
-    expect(unitInfo.diskChangesOffsetMapper.map('C>> '.length),
-        'C/*?*/>/*?*//*?*/> '.length);
-    expect(unitInfo.diskChangesOffsetMapper.map('C>> x'.length),
-        'C/*?*/>/*?*//*?*/> x'.length);
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/migration_summary_test.dart b/pkg/nnbd_migration/test/front_end/migration_summary_test.dart
deleted file mode 100644
index 15b75bd7d474..000000000000
--- a/pkg/nnbd_migration/test/front_end/migration_summary_test.dart
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert';
-
-import 'package:analyzer/file_system/memory_file_system.dart';
-import 'package:analyzer/src/string_source.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/front_end/migration_summary.dart';
-import 'package:path/path.dart' as path;
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(MigrationSummaryTestPosix);
-    defineReflectiveTests(MigrationSummaryTestWindows);
-  });
-}
-
-abstract class MigrationSummaryTestBase {
-  MemoryResourceProvider get resourceProvider;
-}
-
-mixin MigrationSummaryTestCases on MigrationSummaryTestBase {
-  test_summarize_changes_by_file() {
-    var summaryPath = resourceProvider.convertPath('/summary.json');
-    var rootPath = resourceProvider.convertPath('/project');
-    var summary = MigrationSummary(summaryPath, resourceProvider, rootPath);
-    summary.recordChanges(
-        StringSource('', resourceProvider.convertPath('/project/lib/foo.dart')),
-        {
-          0: [
-            AtomicEdit.insert('x',
-                info: AtomicEditInfo(
-                    NullabilityFixDescription.makeTypeNullable('int'),
-                    const {}))
-          ]
-        });
-    summary.write();
-    var json =
-        jsonDecode(resourceProvider.getFile(summaryPath).readAsStringSync());
-    var separator = resourceProvider.pathContext.separator;
-    expect(json['changes']['byPath'], {
-      'lib${separator}foo.dart': {'makeTypeNullable': 1}
-    });
-  }
-}
-
-@reflectiveTest
-class MigrationSummaryTestPosix extends MigrationSummaryTestBase
-    with MigrationSummaryTestCases {
-  @override
-  final MemoryResourceProvider resourceProvider =
-      MemoryResourceProvider(context: path.posix);
-}
-
-@reflectiveTest
-class MigrationSummaryTestWindows extends MigrationSummaryTestBase
-    with MigrationSummaryTestCases {
-  @override
-  final MemoryResourceProvider resourceProvider =
-      MemoryResourceProvider(context: path.windows);
-}
diff --git a/pkg/nnbd_migration/test/front_end/mocks.dart b/pkg/nnbd_migration/test/front_end/mocks.dart
deleted file mode 100644
index d09c799baeeb..000000000000
--- a/pkg/nnbd_migration/test/front_end/mocks.dart
+++ /dev/null
@@ -1,46 +0,0 @@
-// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer_plugin/protocol/protocol.dart';
-import 'package:test/test.dart';
-
-/// A [Matcher] that check that the given [Response] has an expected identifier
-/// and no error.
-Matcher isResponseSuccess(String id) => _IsResponseSuccess(id);
-
-/// A [Matcher] that check that there are no `error` in a given [Response].
-class _IsResponseSuccess extends Matcher {
-  final String _id;
-
-  _IsResponseSuccess(this._id);
-
-  @override
-  Description describe(Description description) {
-    return description
-        .addDescriptionOf('response with identifier "$_id" and without error');
-  }
-
-  @override
-  Description describeMismatch(
-      item, Description mismatchDescription, Map matchState, bool verbose) {
-    Response? response = item as Response?;
-    if (response == null) {
-      mismatchDescription.add('is null response');
-    } else {
-      var id = response.id;
-      var error = response.error;
-      mismatchDescription.add('has identifier "$id"');
-      if (error != null) {
-        mismatchDescription.add(' and has error $error');
-      }
-    }
-    return mismatchDescription;
-  }
-
-  @override
-  bool matches(item, Map matchState) {
-    Response? response = item as Response?;
-    return response != null && response.id == _id && response.error == null;
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/navigation_tree_renderer_test.dart b/pkg/nnbd_migration/test/front_end/navigation_tree_renderer_test.dart
deleted file mode 100644
index 536560f16136..000000000000
--- a/pkg/nnbd_migration/test/front_end/navigation_tree_renderer_test.dart
+++ /dev/null
@@ -1,358 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/navigation_tree_renderer.dart';
-import 'package:nnbd_migration/src/front_end/path_mapper.dart';
-import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'nnbd_migration_test_base.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(NavigationTreeRendererTest);
-  });
-}
-
-const isNavigationTreeDirectoryNode =
-    TypeMatcher();
-
-const isNavigationTreeFileNode = TypeMatcher();
-
-@reflectiveTest
-class NavigationTreeRendererTest extends NnbdMigrationTestBase {
-  PathMapper? pathMapper;
-
-  /// Render the navigation tree view for [files].
-  Future> renderNavigationTree(
-      Map files) async {
-    await buildInfoForTestFiles(files, includedRoot: projectPath);
-    var migrationInfo =
-        MigrationInfo(infos, {}, resourceProvider.pathContext, projectPath);
-    pathMapper = PathMapper(resourceProvider);
-    return NavigationTreeRenderer(migrationInfo, pathMapper).render();
-  }
-
-  Future test_containsEditCounts() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = 1;',
-      convertPath('$projectPath/lib/b.dart'): 'int b = null;',
-      convertPath('$projectPath/lib/c.dart'): 'int c = null;\nint d = null;',
-    });
-
-    var libNode = response[0] as NavigationTreeDirectoryNode;
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode.havingSubtree([
-          isNavigationTreeFileNode.havingEditCount(0),
-          isNavigationTreeFileNode.havingEditCount(1),
-          isNavigationTreeFileNode.havingEditCount(2)
-        ]));
-  }
-
-  Future test_containsHrefs() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/src/b.dart'): 'int b = null;',
-      convertPath('$projectPath/tool.dart'): 'int c = null;',
-    });
-
-    var libNode = response[0];
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode.named('lib').havingSubtree([
-          isNavigationTreeDirectoryNode.named('src').havingSubtree([
-            isNavigationTreeFileNode.havingHref(
-                '$projectPath/lib/src/b.dart', pathMapper!)
-          ]),
-          isNavigationTreeFileNode.havingHref(
-              '$projectPath/lib/a.dart', pathMapper!)
-        ]));
-
-    var toolNode = response[1] as NavigationTreeFileNode;
-    expect(
-        toolNode.href, pathMapper!.map(convertPath('$projectPath/tool.dart')));
-  }
-
-  Future test_containsMultipleLinks_multipleDepths() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/src/b.dart'): 'int b = null;',
-      convertPath('$projectPath/tool.dart'): 'int c = null;',
-    });
-    expect(response, hasLength(2));
-
-    var libNode = response[0];
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode.named('lib').havingSubtree([
-          isNavigationTreeDirectoryNode
-              .named('src')
-              .havingSubtree([isNavigationTreeFileNode.named('b.dart')]),
-          isNavigationTreeFileNode.named('a.dart')
-        ]));
-
-    var toolNode = response[1];
-    expect(toolNode.name, 'tool.dart');
-  }
-
-  Future test_containsMultipleLinks_multipleRoots() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/bin/bin.dart'): 'int c = null;',
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-    });
-    expect(response, hasLength(2));
-
-    var binNode = response[0] as NavigationTreeDirectoryNode;
-    expect(binNode.type, equals(NavigationTreeNodeType.directory));
-    expect(binNode.name, equals('bin'));
-    expect(binNode.subtree, hasLength(1));
-
-    var libNode = response[1] as NavigationTreeDirectoryNode;
-    expect(libNode.type, equals(NavigationTreeNodeType.directory));
-    expect(libNode.name, equals('lib'));
-    expect(libNode.subtree, hasLength(1));
-  }
-
-  Future test_containsMultipleLinks_sameDepth() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/b.dart'): 'int b = null;',
-    });
-    expect(response, hasLength(1));
-
-    var libNode = response[0];
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode.named('lib').havingSubtree([
-          isNavigationTreeFileNode
-              .named('a.dart')
-              .havingPath(convertPath('lib/a.dart'))
-              .havingHref('$projectPath/lib/a.dart', pathMapper!),
-          isNavigationTreeFileNode
-              .named('b.dart')
-              .havingPath(convertPath('lib/b.dart'))
-              .havingHref('$projectPath/lib/b.dart', pathMapper!)
-        ]));
-  }
-
-  Future test_containsPaths() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/src/b.dart'): 'int b = null;',
-      convertPath('$projectPath/tool.dart'): 'int c = null;',
-    });
-
-    var libNode = response[0];
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode.named('lib').havingSubtree([
-          isNavigationTreeDirectoryNode.named('src').havingSubtree([
-            isNavigationTreeFileNode.havingPath(convertPath('lib/src/b.dart'))
-          ]),
-          isNavigationTreeFileNode.havingPath(convertPath('lib/a.dart'))
-        ]));
-
-    var toolNode = response[1];
-    expect(toolNode.path, 'tool.dart');
-  }
-
-  Future test_containsSingleLink_deep() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/src/a.dart'): 'int a = null;',
-    });
-    expect(response, hasLength(1));
-
-    var libNode = response[0];
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode.named('lib').havingSubtree([
-          isNavigationTreeDirectoryNode.named('src').havingSubtree([
-            isNavigationTreeFileNode
-                .named('a.dart')
-                .havingPath(convertPath('lib/src/a.dart'))
-                .havingHref('$projectPath/lib/src/a.dart', pathMapper!)
-          ])
-        ]));
-  }
-
-  Future test_containsSingleLink_shallow() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/a.dart'): 'int a = null;',
-    });
-    expect(response, hasLength(1));
-
-    var aNode = response[0] as NavigationTreeFileNode;
-    expect(aNode.name, 'a.dart');
-    expect(aNode.path, 'a.dart');
-    expect(aNode.href, pathMapper!.map(convertPath('$projectPath/a.dart')));
-  }
-
-  Future test_migrationStatus_directory_allMigrated() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/src/b.dart'): 'int b = null;',
-    });
-
-    var libNode = response[0] as NavigationTreeDirectoryNode;
-    ((libNode.subtree![0] as NavigationTreeDirectoryNode).subtree![0]
-            as NavigationTreeFileNode)
-        .migrationStatus = UnitMigrationStatus.alreadyMigrated;
-    (libNode.subtree![1] as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.alreadyMigrated;
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode
-            .named('lib')
-            .havingMigrationStatus(UnitMigrationStatus.alreadyMigrated)
-            .havingSubtree([
-          isNavigationTreeDirectoryNode
-              .named('src')
-              .havingMigrationStatus(UnitMigrationStatus.alreadyMigrated),
-          isNavigationTreeFileNode
-        ]));
-  }
-
-  Future test_migrationStatus_directory_allMigrating() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/src/b.dart'): 'int b = null;',
-    });
-
-    var libNode = response[0];
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode
-            .named('lib')
-            .havingMigrationStatus(UnitMigrationStatus.migrating)
-            .havingSubtree([
-          isNavigationTreeDirectoryNode
-              .named('src')
-              .havingMigrationStatus(UnitMigrationStatus.migrating),
-          isNavigationTreeFileNode
-        ]));
-  }
-
-  Future test_migrationStatus_directory_allOptingOut() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/src/b.dart'): 'int b = null;',
-    });
-
-    var libNode = response[0] as NavigationTreeDirectoryNode;
-    ((libNode.subtree![0] as NavigationTreeDirectoryNode).subtree![0]
-            as NavigationTreeFileNode)
-        .migrationStatus = UnitMigrationStatus.optingOut;
-    (libNode.subtree![1] as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.optingOut;
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode
-            .named('lib')
-            .havingMigrationStatus(UnitMigrationStatus.optingOut)
-            .havingSubtree([
-          isNavigationTreeDirectoryNode
-              .named('src')
-              .havingMigrationStatus(UnitMigrationStatus.optingOut),
-          isNavigationTreeFileNode
-        ]));
-  }
-
-  Future test_migrationStatus_directory_mixedInAndOut() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/src/b.dart'): 'int b = null;',
-      convertPath('$projectPath/lib/src/c.dart'): 'int b = null;',
-    });
-
-    var libNode = response[0] as NavigationTreeDirectoryNode;
-    var libSrcNode = libNode.subtree![0] as NavigationTreeDirectoryNode;
-    (libSrcNode.subtree![0] as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.optingOut;
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode
-            .named('lib')
-            .havingMigrationStatus(UnitMigrationStatus.indeterminate)
-            .havingSubtree([
-          isNavigationTreeDirectoryNode
-              .named('src')
-              .havingMigrationStatus(UnitMigrationStatus.indeterminate),
-          isNavigationTreeFileNode
-        ]));
-  }
-
-  Future test_migrationStatus_directory_mixedInAndOutAndMigrated() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = null;',
-      convertPath('$projectPath/lib/src/b.dart'): 'int b = null;',
-      convertPath('$projectPath/lib/src/c.dart'): 'int b = null;',
-    });
-
-    var libNode = response[0] as NavigationTreeDirectoryNode;
-    var libSrcNode = libNode.subtree![0] as NavigationTreeDirectoryNode;
-    (libSrcNode.subtree![0] as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.optingOut;
-    (libSrcNode.subtree![1] as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.alreadyMigrated;
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode
-            .named('lib')
-            .havingMigrationStatus(UnitMigrationStatus.indeterminate)
-            .havingSubtree([
-          isNavigationTreeDirectoryNode
-              .named('src')
-              .havingMigrationStatus(UnitMigrationStatus.optingOut),
-          isNavigationTreeFileNode
-        ]));
-  }
-
-  Future test_migrationStatus_file() async {
-    var response = await renderNavigationTree({
-      convertPath('$projectPath/lib/a.dart'): 'int a = 1;',
-      convertPath('$projectPath/lib/b.dart'): '// @dart=2.9\nint b = null;',
-    });
-
-    var libNode = response[0] as NavigationTreeDirectoryNode;
-    expect(
-        libNode,
-        isNavigationTreeDirectoryNode.havingSubtree([
-          isNavigationTreeFileNode
-              .havingMigrationStatus(UnitMigrationStatus.migrating),
-          isNavigationTreeFileNode
-              .havingMigrationStatus(UnitMigrationStatus.migrating),
-        ]));
-  }
-}
-
-extension on TypeMatcher {
-  TypeMatcher havingMigrationStatus(dynamic matcher) =>
-      having((node) => node.migrationStatus, 'migrationStatus', matcher);
-
-  TypeMatcher named(dynamic matcher) =>
-      having((node) => node.name, 'name', matcher);
-}
-
-extension on TypeMatcher {
-  TypeMatcher havingSubtree(dynamic matcher) =>
-      having((node) => node.subtree, 'subtree', matcher);
-}
-
-extension on TypeMatcher {
-  TypeMatcher havingEditCount(dynamic matcher) =>
-      having((node) => node.editCount, 'editCount', matcher);
-
-  //TypeMatcher named(dynamic matcher) =>
-  //    having((node) => node.name, 'name', matcher);
-
-  TypeMatcher havingHref(
-          String path, PathMapper pathMapper) =>
-      having((node) => node.href, 'href', pathMapper.map(path));
-
-  TypeMatcher havingPath(dynamic matcher) =>
-      having((node) => node.path, 'path', matcher);
-}
diff --git a/pkg/nnbd_migration/test/front_end/nnbd_migration_test_base.dart b/pkg/nnbd_migration/test/front_end/nnbd_migration_test_base.dart
deleted file mode 100644
index 6df8f38e314f..000000000000
--- a/pkg/nnbd_migration/test/front_end/nnbd_migration_test_base.dart
+++ /dev/null
@@ -1,264 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/analysis/results.dart';
-import 'package:analyzer/source/line_info.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/front_end/dartfix_listener.dart';
-import 'package:nnbd_migration/src/front_end/driver_provider_impl.dart';
-import 'package:nnbd_migration/src/front_end/info_builder.dart';
-import 'package:nnbd_migration/src/front_end/instrumentation_listener.dart';
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/non_nullable_fix.dart';
-import 'package:nnbd_migration/src/front_end/offset_mapper.dart';
-import 'package:nnbd_migration/src/hint_action.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import '../utilities/test_logger.dart';
-import 'analysis_abstract.dart';
-
-class ListenerClient implements DartFixListenerClient {
-  @override
-  void onException(String detail) {
-    fail('Unexpected call to onException($detail)');
-  }
-
-  @override
-  void onFatalError(String detail) {
-    fail('Unexpected call to onFatalError($detail)');
-  }
-
-  @override
-  void onMessage(String detail) {
-    fail('Unexpected call to onMessage($detail)');
-  }
-}
-
-@reflectiveTest
-class NnbdMigrationTestBase extends AbstractAnalysisTest {
-  /// The information produced by the InfoBuilder, or `null` if [buildInfo] has
-  /// not yet completed.
-  Set? infos;
-  NodeMapper? nodeMapper;
-
-  /// Assert that some target in [targets] has various properties.
-  void assertInTargets(
-      {required Iterable targets,
-      int? offset,
-      int? length,
-      OffsetMapper? offsetMapper}) {
-    var failureReasons = [
-      if (offset != null) 'offset: $offset',
-      if (length != null) 'length: $length',
-      if (offsetMapper != null) 'match a custom offset mapper',
-    ].join(' and ');
-    offsetMapper ??= OffsetMapper.identity;
-    expect(targets.any((t) {
-      return (offset == null || offset == offsetMapper!.map(t.offset)) &&
-          (length == null || length == t.length);
-    }), isTrue, reason: 'Expected one of $targets to contain $failureReasons');
-  }
-
-  /// Assert various properties of the given [region]. If an [offset] is
-  /// provided but no [length] is provided, a default length of `1` will be
-  /// used.
-  void assertRegion(
-      {required RegionInfo region,
-      int? offset,
-      int? length,
-      Object explanation = anything,
-      Object edits = anything,
-      Object traces = anything,
-      Object kind = NullabilityFixKind.makeTypeNullable}) {
-    if (offset != null) {
-      expect(region.offset, offset);
-      expect(region.length, length ?? 1);
-    } else if (length != null) {
-      expect(region.length, length);
-    }
-    expect(region.kind, kind);
-    expect(region.edits, edits);
-    expect(region.explanation, explanation);
-    expect(region.traces, traces);
-  }
-
-  /// Asserts various properties of the pair of [regions], `regions[index]` and
-  /// `regions[index + 1]`.  The expected offsets and lengths are specified
-  /// separately; everything else is asserted using the same matcher.
-  void assertRegionPair(List regions, int index,
-      {int? offset1,
-      int? length1,
-      int? offset2,
-      int? length2,
-      Object explanation = anything,
-      Object edits = anything,
-      Object traces = anything,
-      Object kind = anything}) {
-    assertRegion(
-        region: regions[index],
-        offset: offset1,
-        length: length1,
-        explanation: explanation,
-        edits: edits,
-        traces: traces,
-        kind: kind);
-    assertRegion(
-        region: regions[index + 1],
-        offset: offset2,
-        length: length2,
-        explanation: explanation,
-        edits: edits,
-        traces: traces,
-        kind: kind);
-  }
-
-  void assertTraceEntry(UnitInfo unit, TraceEntryInfo entryInfo,
-      String function, int offset, Object descriptionMatcher,
-      {Set? hintActions}) {
-    assert(offset >= 0);
-    var lineInfo = LineInfo.fromContent(unit.content!);
-    var expectedLocation = lineInfo.getLocation(offset);
-    expect(entryInfo.target!.filePath, unit.path);
-    expect(entryInfo.target!.line, expectedLocation.lineNumber);
-    expect(unit.offsetMapper.map(entryInfo.target!.offset), offset);
-    expect(entryInfo.function, function);
-    expect(entryInfo.description, descriptionMatcher);
-    if (hintActions != null) {
-      assertTraceHintActions(unit, entryInfo, hintActions, offset);
-    }
-  }
-
-  void assertTraceHintActions(UnitInfo unit, TraceEntryInfo traceEntry,
-      Set expectedHints, int nodeOffset) {
-    final actionsByKind = Map.fromIterables(
-        traceEntry.hintActions.map((action) => action.kind),
-        traceEntry.hintActions);
-    expect(actionsByKind, hasLength(expectedHints.length));
-    for (final expectedHint in expectedHints) {
-      final action = actionsByKind[expectedHint]!;
-      expect(action, isNotNull);
-      final node = nodeMapper!.nodeForId(action.nodeId)!;
-      expect(node, isNotNull);
-      expect(unit.offsetMapper.map(node.codeReference!.offset), nodeOffset);
-    }
-  }
-
-  /// Uses the InfoBuilder to build information for [testFile].
-  ///
-  /// The information is stored in [infos].
-  Future buildInfo(
-      {bool removeViaComments = true, bool warnOnWeakCode = false}) async {
-    var includedRoot = resourceProvider.pathContext.dirname(testFile!);
-    await _buildMigrationInfo([testFile],
-        includedRoot: includedRoot,
-        shouldBeMigratedFunction: (String? path) => true,
-        pathsToProcess: [testFile],
-        removeViaComments: removeViaComments,
-        warnOnWeakCode: warnOnWeakCode);
-  }
-
-  /// Uses the InfoBuilder to build information for a single test file.
-  ///
-  /// Asserts that [originalContent] is migrated to [migratedContent]. Returns
-  /// the singular UnitInfo which was built.
-  Future buildInfoForSingleTestFile(String originalContent,
-      {required String migratedContent,
-      bool removeViaComments = true,
-      bool warnOnWeakCode = false}) async {
-    addTestFile(originalContent);
-    await buildInfo(
-        removeViaComments: removeViaComments, warnOnWeakCode: warnOnWeakCode);
-    // Ignore info for dart:core.
-    var filteredInfos = [
-      for (var info in infos!)
-        if (!info.path!.contains('core.dart')) info
-    ];
-    expect(filteredInfos, hasLength(1));
-    var unit = filteredInfos[0];
-    expect(unit.path, testFile);
-    expect(unit.content, migratedContent);
-    return unit;
-  }
-
-  /// Uses the [InfoBuilder] to build information for test files.
-  ///
-  /// Returns the singular [UnitInfo] which was built.
-  Future> buildInfoForTestFiles(Map files,
-      {required String? includedRoot,
-      bool Function(String?)? shouldBeMigratedFunction,
-      Iterable? pathsToProcess}) async {
-    shouldBeMigratedFunction ??= (String? path) => true;
-    var testPaths = [];
-    files.forEach((String path, String content) {
-      newFile(path, content);
-      testPaths.add(path);
-    });
-    pathsToProcess ??= testPaths;
-    await _buildMigrationInfo(testPaths,
-        includedRoot: includedRoot,
-        shouldBeMigratedFunction: shouldBeMigratedFunction,
-        pathsToProcess: pathsToProcess);
-    // Ignore info for dart:core.
-    var filteredInfos = [
-      for (var info in infos!)
-        if (!info.path!.contains('core.dart')) info
-    ];
-    return filteredInfos;
-  }
-
-  void setUp() {
-    super.setUp();
-    nodeMapper = SimpleNodeMapper();
-  }
-
-  /// Uses the InfoBuilder to build information for files at [testPaths], which
-  /// should all share a common parent directory, [includedRoot].
-  Future _buildMigrationInfo(Iterable testPaths,
-      {required String? includedRoot,
-      required bool Function(String?) shouldBeMigratedFunction,
-      required Iterable pathsToProcess,
-      bool removeViaComments = true,
-      bool warnOnWeakCode = false}) async {
-    // Compute the analysis results.
-    var server = DriverProviderImpl(resourceProvider, driver!.analysisContext);
-    // Run the migration engine.
-    var listener = DartFixListener(server, ListenerClient());
-    var instrumentationListener = InstrumentationListener();
-    var adapter = NullabilityMigrationAdapter(listener);
-    var migration = NullabilityMigration(adapter,
-        permissive: false,
-        instrumentation: instrumentationListener,
-        removeViaComments: removeViaComments,
-        warnOnWeakCode: warnOnWeakCode);
-    Future forEachPath(void Function(ResolvedUnitResult) callback) async {
-      for (var testPath in testPaths) {
-        var result = await driver!.currentSession.getResolvedUnit(testPath!)
-            as ResolvedUnitResult;
-        callback(result);
-      }
-    }
-
-    await forEachPath(migration.prepareInput);
-    expect(migration.unmigratedDependencies, isEmpty);
-    await forEachPath(migration.processInput);
-    await forEachPath(migration.finalizeInput);
-    migration.finish();
-    // Build the migration info.
-    var info = instrumentationListener.data;
-    var logger = TestLogger(false);
-    var builder = InfoBuilder(
-        resourceProvider,
-        includedRoot,
-        info,
-        listener,
-        migration,
-        nodeMapper,
-        logger,
-        shouldBeMigratedFunction,
-        pathsToProcess);
-    infos = await builder.explainMigration();
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/offset_mapper_test.dart b/pkg/nnbd_migration/test/front_end/offset_mapper_test.dart
deleted file mode 100644
index 011210829b32..000000000000
--- a/pkg/nnbd_migration/test/front_end/offset_mapper_test.dart
+++ /dev/null
@@ -1,266 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer_plugin/protocol/protocol_common.dart';
-import 'package:nnbd_migration/src/front_end/offset_mapper.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'analysis_abstract.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(OffsetMapperTest);
-  });
-}
-
-@reflectiveTest
-class OffsetMapperTest extends AbstractAnalysisTest {
-  void test_identity() {
-    var mapper = OffsetMapper.identity;
-    expect(mapper.map(0), 0);
-    expect(mapper.map(20), 20);
-    expect(mapper.map(0xFFFFFF), 0xFFFFFF);
-  }
-
-  void test_insertMapper() {
-    var mapper = OffsetMapper.forInsertion(10, 5);
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), 15);
-    expect(mapper.map(11), 16);
-    expect(mapper.map(20), 25);
-  }
-
-  void test_multipleEdits() {
-    var mapper = OffsetMapper.forEdits([
-      SourceEdit(13, 0, '?'),
-      SourceEdit(21, 0, '!'),
-      SourceEdit(32, 0, '?'),
-    ]);
-    expect(mapper.map(0), 0);
-    expect(mapper.map(13), 13);
-    expect(mapper.map(14), 15);
-    expect(mapper.map(21), 22);
-    expect(mapper.map(22), 24);
-    expect(mapper.map(32), 34);
-    expect(mapper.map(33), 36);
-    expect(mapper.map(55), 58);
-  }
-
-  void test_rebase_deletionRebasingInsertion() {
-    var mapper = OffsetMapper.rebase(OffsetMapper.forReplacement(5, 2, ''),
-        OffsetMapper.forInsertion(10, 5));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(4), 4);
-    expect(mapper.map(5), null);
-    expect(mapper.map(6), null);
-    expect(mapper.map(7), 5);
-    expect(mapper.map(8), 6);
-    expect(mapper.map(11), 14);
-    expect(mapper.map(12), 15);
-  }
-
-  void test_rebase_insertionRebasingDeletion() {
-    var mapper = OffsetMapper.rebase(OffsetMapper.forInsertion(5, 5),
-        OffsetMapper.forReplacement(10, 5, ''));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(4), 4);
-    expect(mapper.map(5), 10);
-    expect(mapper.map(6), 11);
-    expect(mapper.map(9), 14);
-    expect(mapper.map(10), null);
-    expect(mapper.map(14), null);
-    expect(mapper.map(15), 15);
-    expect(mapper.map(16), 16);
-  }
-
-  void test_rebase_insertMapper() {
-    var mapper = OffsetMapper.rebase(
-        OffsetMapper.forInsertion(5, 5), OffsetMapper.forInsertion(10, 5));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(4), 4);
-    expect(mapper.map(5), 10);
-    expect(mapper.map(6), 11);
-    expect(mapper.map(9), 14);
-    expect(mapper.map(10), 20);
-    expect(mapper.map(11), 21);
-    expect(mapper.map(12), 22);
-  }
-
-  void test_replacementMapper_effectivelyDeletes() {
-    var mapper = OffsetMapper.forReplacement(10, 5, '');
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), null);
-    expect(mapper.map(11), null);
-    expect(mapper.map(14), null);
-    expect(mapper.map(15), 10);
-  }
-
-  void test_replacementMapper_effectivelyDeletesAndInserts() {
-    var mapper = OffsetMapper.forReplacement(10, 5, 'foo');
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), null);
-    expect(mapper.map(11), null);
-    expect(mapper.map(14), null);
-    expect(mapper.map(15), 13);
-    expect(mapper.map(16), 14);
-  }
-
-  void test_replacementMapper_effectivelyInserts() {
-    var mapper = OffsetMapper.forReplacement(10, 0, 'five ');
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), 15);
-    expect(mapper.map(11), 16);
-    expect(mapper.map(20), 25);
-  }
-
-  void test_sequence_insertMappers() {
-    var mapper = OffsetMapper.sequence(
-        OffsetMapper.forInsertion(30, 10), OffsetMapper.forInsertion(10, 10));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), 20);
-    expect(mapper.map(11), 21);
-    expect(mapper.map(29), 39);
-    expect(mapper.map(30), 50);
-    expect(mapper.map(31), 51);
-  }
-
-  void test_sequence_insertMappers_firstBeforeSecond() {
-    var mapper = OffsetMapper.sequence(
-        OffsetMapper.forInsertion(10, 10), OffsetMapper.forInsertion(30, 10));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), 20);
-    expect(mapper.map(11), 21);
-    expect(mapper.map(19), 29);
-    expect(mapper.map(20), 40);
-    expect(mapper.map(21), 41);
-  }
-
-  void test_sequence_insertMappers_overlapping() {
-    // by inserting into the middle of a previous insertion, we just effectively
-    // make the first insertion longer.
-    var mapper = OffsetMapper.sequence(
-        OffsetMapper.forInsertion(10, 10), OffsetMapper.forInsertion(15, 5));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), 25);
-    expect(mapper.map(11), 26);
-    expect(mapper.map(20), 35);
-  }
-
-  void test_sequence_replacementMappers_deleteAmidInsert() {
-    // Deleting in the middle of an insertion is equivalent to originally making
-    // a smaller insertion.
-    var mapper = OffsetMapper.sequence(
-        OffsetMapper.forReplacement(10, 0, 'five '),
-        OffsetMapper.forReplacement(12, 3, ''));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), 12);
-    expect(mapper.map(11), 13);
-  }
-
-  void test_sequence_replacementMappers_deleteAroundInsert() {
-    // Deleting around an insertion is equivalent to originally making a smaller
-    // deletion.
-    var mapper = OffsetMapper.sequence(
-        OffsetMapper.forReplacement(15, 0, 'five '),
-        OffsetMapper.forReplacement(10, 15, ''));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), null);
-    expect(mapper.map(11), null);
-    expect(mapper.map(19), null);
-    expect(mapper.map(20), 10);
-    expect(mapper.map(21), 11);
-  }
-
-  void test_sequence_replacementMappers_deleteIntoInsert() {
-    // A deletion starting before an insertion that goes into the middle of an
-    // insertion is equivalent to a smaller deletion + a smaller insertion.
-    var mapper = OffsetMapper.sequence(
-        OffsetMapper.forReplacement(10, 0, 'five '),
-        OffsetMapper.forReplacement(5, 7, ''));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(4), 4);
-    expect(mapper.map(5), null);
-    expect(mapper.map(6), null);
-    expect(mapper.map(10), 8);
-    expect(mapper.map(11), 9);
-  }
-
-  void test_sequence_replacementMappers_deletePastInsert() {
-    // A deletion starting in the middle of an insertion that goes past the end
-    // is equivalent to a smaller insertion + a smaller deletion.
-    var mapper = OffsetMapper.sequence(
-        OffsetMapper.forReplacement(10, 0, 'five '),
-        OffsetMapper.forReplacement(12, 10, ''));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), null);
-    expect(mapper.map(11), null);
-    expect(mapper.map(16), null);
-    expect(mapper.map(17), 12);
-    expect(mapper.map(18), 13);
-  }
-
-  void test_sequence_replacementMappers_insertAmidDeletion() {
-    // Inserting at a deletion offset is equivalent to inserting after the
-    // deletion.
-    var mapper = OffsetMapper.sequence(OffsetMapper.forReplacement(10, 5, ''),
-        OffsetMapper.forReplacement(10, 0, 'foo'));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), null);
-    expect(mapper.map(11), null);
-    expect(mapper.map(14), null);
-    expect(mapper.map(15), 13);
-    expect(mapper.map(16), 14);
-  }
-
-  void test_sequence_replacementMappers_twoDeletions_consecutive() {
-    var mapper = OffsetMapper.sequence(OffsetMapper.forReplacement(10, 5, ''),
-        OffsetMapper.forReplacement(10, 5, ''));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), null);
-    expect(mapper.map(11), null);
-    expect(mapper.map(19), null);
-    expect(mapper.map(20), 10);
-    expect(mapper.map(21), 11);
-  }
-
-  void test_sequence_replacementMappers_twoDeletions_separate() {
-    var mapper = OffsetMapper.sequence(OffsetMapper.forReplacement(10, 5, ''),
-        OffsetMapper.forReplacement(15, 5, ''));
-    expect(mapper.map(0), 0);
-    expect(mapper.map(9), 9);
-    expect(mapper.map(10), null);
-    expect(mapper.map(11), null);
-    expect(mapper.map(14), null);
-    expect(mapper.map(15), 10);
-    expect(mapper.map(16), 11);
-    expect(mapper.map(19), 14);
-    expect(mapper.map(20), null);
-    expect(mapper.map(21), null);
-    expect(mapper.map(24), null);
-    expect(mapper.map(25), 15);
-    expect(mapper.map(26), 16);
-  }
-
-  void test_singleEdit() {
-    var mapper = OffsetMapper.forEdits([
-      SourceEdit(13, 0, '?'),
-    ]);
-    expect(mapper.map(0), 0);
-    expect(mapper.map(13), 13);
-    expect(mapper.map(14), 15);
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/region_renderer_test.dart b/pkg/nnbd_migration/test/front_end/region_renderer_test.dart
deleted file mode 100644
index 8fb31f64d83b..000000000000
--- a/pkg/nnbd_migration/test/front_end/region_renderer_test.dart
+++ /dev/null
@@ -1,194 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/path_mapper.dart';
-import 'package:nnbd_migration/src/front_end/region_renderer.dart';
-import 'package:nnbd_migration/src/front_end/web/edit_details.dart';
-import 'package:path/path.dart' as p;
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'nnbd_migration_test_base.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(RegionRendererTest);
-    defineReflectiveTests(RegionRendererTestDriveD);
-  });
-}
-
-@reflectiveTest
-class RegionRendererTest extends RegionRendererTestBase {
-  /// Returns the basename of [testFile], used in traces.
-  String get _testFileBasename =>
-      resourceProvider.pathContext.basename(testFile!);
-
-  Future test_informationalRegion_containsTrace() async {
-    await buildInfoForSingleTestFile('f(int a) => a.isEven;',
-        migratedContent: 'f(int  a) => a.isEven;');
-    var response = renderRegion(5);
-    expect(response.traces, hasLength(1));
-    var trace = response.traces![0];
-    expect(trace.description, equals('Non-nullability reason'));
-  }
-
-  Future test_informationalRegion_containsTraceEntryDescriptions() async {
-    await buildInfoForSingleTestFile('f(int a) => a.isEven;',
-        migratedContent: 'f(int  a) => a.isEven;');
-    var response = renderRegion(5);
-    expect(response.traces, hasLength(1));
-    var trace = response.traces![0];
-    expect(trace.entries, hasLength(2));
-    expect(trace.entries[0].description,
-        equals('parameter 0 of f ($_testFileBasename:1:3)'));
-    expect(trace.entries[1].description, equals('data flow'));
-  }
-
-  Future test_informationalRegion_containsTraceLinks() async {
-    await buildInfoForSingleTestFile('f(int a) => a.isEven;',
-        migratedContent: 'f(int  a) => a.isEven;');
-    var response = renderRegion(5);
-    expect(response.traces, hasLength(1));
-    var trace = response.traces![0];
-    var entry = trace.entries[0];
-    expect(entry.link, isNotNull);
-    var testFileUriPath = resourceProvider.pathContext.toUri(testFile!).path;
-    expect(entry.link!.href,
-        equals('$testFileUriPath?offset=2&line=1&authToken=AUTH_TOKEN'));
-    expect(entry.link!.path,
-        equals(resourceProvider.pathContext.toUri(_testFileBasename).path));
-  }
-
-  Future test_modifiedOutput_containsExplanation() async {
-    await buildInfoForSingleTestFile('int a = null;',
-        migratedContent: 'int? a = null;');
-    var response = renderRegion(3);
-    expect(response.explanation, equals("Changed type 'int' to be nullable"));
-  }
-
-  Future test_modifiedOutput_containsPath() async {
-    await buildInfoForSingleTestFile('int a = null;',
-        migratedContent: 'int? a = null;');
-    var response = renderRegion(3);
-    expect(response.displayPath, equals(testFile));
-    expect(response.uriPath, equals(pathMapper!.map(testFile!)));
-    expect(response.line, equals(1));
-  }
-
-  Future test_modifiedOutput_containsTraceForNullabilityReason() async {
-    await buildInfoForSingleTestFile('int a = null;',
-        migratedContent: 'int? a = null;');
-    var response = renderRegion(3);
-    expect(response.traces, hasLength(1));
-    var trace = response.traces![0];
-    expect(trace.description, equals('Nullability reason'));
-    expect(trace.entries, hasLength(4));
-    expect(trace.entries[0].description, equals('a ($_testFileBasename:1:1)'));
-    expect(trace.entries[1].description, equals('data flow'));
-    expect(trace.entries[2].description,
-        equals('null literal ($_testFileBasename:1:9)'));
-    expect(trace.entries[3].description, equals('literal expression'));
-  }
-
-  Future test_unmodifiedOutput_containsExplanation() async {
-    await buildInfoForSingleTestFile('f(int a) => a.isEven;',
-        migratedContent: 'f(int  a) => a.isEven;');
-    var response = renderRegion(5);
-    expect(response.explanation, equals("Type 'int' was not made nullable"));
-  }
-
-  Future test_unmodifiedOutput_containsPath() async {
-    await buildInfoForSingleTestFile('f(int a) => a.isEven;',
-        migratedContent: 'f(int  a) => a.isEven;');
-    var response = renderRegion(5);
-    expect(response.displayPath, equals(testFile));
-    expect(response.uriPath, equals(pathMapper!.map(testFile!)));
-    expect(response.line, equals(1));
-  }
-}
-
-class RegionRendererTestBase extends NnbdMigrationTestBase {
-  PathMapper? pathMapper;
-
-  /// Render the region at [offset], using a [MigrationInfo] which knows only
-  /// about the library at `infos.single`.
-  EditDetails renderRegion(int offset) {
-    var migrationInfo =
-        MigrationInfo(infos, {}, resourceProvider.pathContext, projectPath);
-    var unitInfo = infos!.single;
-    var region = unitInfo.regionAt(offset);
-    pathMapper = PathMapper(resourceProvider);
-    return RegionRenderer(
-            region, unitInfo, migrationInfo, pathMapper, 'AUTH_TOKEN')
-        .render();
-  }
-}
-
-@reflectiveTest
-class RegionRendererTestDriveD extends RegionRendererTestBase {
-  @override
-  String get homePath => _switchToDriveD(super.homePath);
-
-  Future
-      test_informationalRegion_containsTraceLinks_separateDrive() async {
-    // See https://github.com/dart-lang/sdk/issues/43178. Linking from a file on
-    // one drive to a file on another drive can cause problems.
-    await buildInfoForSingleTestFile(r'''
-f(List a) {
-  if (1 == 2) List.from(a);
-}
-g() {
-  f(null);
-}
-''', migratedContent: r'''
-f(List? a) {
-  if (1 == 2) List.from(a!);
-}
-g() {
-  f(null);
-}
-''');
-    var response = renderRegion(44); // The inserted null-check.
-    expect(response.displayPath,
-        equals(_switchToDriveD(convertPath('/home/tests/bin/test.dart'))));
-    expect(response.traces, hasLength(2));
-    var trace = response.traces![1];
-    expect(trace.description, equals('Non-nullability reason'));
-    expect(trace.entries, hasLength(1));
-    var entry = trace.entries[0];
-    expect(entry.link, isNotNull);
-    var sdkCoreLib = convertPath('/sdk/lib/core/core.dart');
-    var sdkCoreLibUriPath = resourceProvider.pathContext.toUri(sdkCoreLib).path;
-    var coreLibText = resourceProvider.getFile(sdkCoreLib).readAsStringSync();
-    var expectedOffset =
-        'List.from'.allMatches(coreLibText).single.start + 'List.'.length;
-    var expectedLine =
-        '\n'.allMatches(coreLibText.substring(0, expectedOffset)).length + 1;
-    expect(
-        entry.link!.href,
-        equals('$sdkCoreLibUriPath?'
-            'offset=$expectedOffset&'
-            'line=$expectedLine&'
-            'authToken=AUTH_TOKEN'));
-    // On Windows, the path will simply be the absolute path to the core
-    // library, because there is no relative route from C:\ to D:\. On Posix,
-    // the path is relative.
-    var expectedLinkPath = resourceProvider.pathContext.style == p.Style.windows
-        ? sdkCoreLibUriPath
-        : '../../..$sdkCoreLibUriPath';
-    expect(entry.link!.path, equals(expectedLinkPath));
-  }
-
-  /// On Windows, replace the C:\ relative root in [path] with the D:\ relative
-  /// root.
-  ///
-  /// On Posix, nothing is be replaced.
-  String _switchToDriveD(String path) {
-    assert(resourceProvider.pathContext.isAbsolute(path));
-    return resourceProvider
-        .convertPath(path)
-        .replaceFirst(RegExp('^C:\\\\'), 'D:\\');
-  }
-}
diff --git a/pkg/nnbd_migration/test/front_end/test_all.dart b/pkg/nnbd_migration/test/front_end/test_all.dart
deleted file mode 100644
index 7c88db822779..000000000000
--- a/pkg/nnbd_migration/test/front_end/test_all.dart
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'info_builder_test.dart' as info_builder;
-import 'instrumentation_renderer_test.dart' as instrumentation_renderer;
-import 'migration_info_test.dart' as migration_info;
-import 'migration_summary_test.dart' as migration_summary;
-import 'navigation_tree_renderer_test.dart' as navigation_tree_renderer;
-import 'offset_mapper_test.dart' as offset_mapper;
-import 'region_renderer_test.dart' as region_renderer;
-import 'unit_renderer_test.dart' as unit_renderer;
-
-main() {
-  defineReflectiveSuite(() {
-    info_builder.main();
-    instrumentation_renderer.main();
-    migration_info.main();
-    migration_summary.main();
-    navigation_tree_renderer.main();
-    offset_mapper.main();
-    region_renderer.main();
-    unit_renderer.main();
-  }, name: 'front_end');
-}
diff --git a/pkg/nnbd_migration/test/front_end/unit_renderer_test.dart b/pkg/nnbd_migration/test/front_end/unit_renderer_test.dart
deleted file mode 100644
index 695916df81c5..000000000000
--- a/pkg/nnbd_migration/test/front_end/unit_renderer_test.dart
+++ /dev/null
@@ -1,450 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/path_mapper.dart';
-import 'package:nnbd_migration/src/front_end/unit_renderer.dart';
-import 'package:nnbd_migration/src/front_end/web/file_details.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'nnbd_migration_test_base.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(UnitRendererTest);
-  });
-}
-
-@reflectiveTest
-class UnitRendererTest extends NnbdMigrationTestBase {
-  /// Render [libraryInfo], using a [MigrationInfo] which knows only about this
-  /// library.
-  List renderUnits() {
-    var packageRoot = convertPath('/package');
-    var migrationInfo =
-        MigrationInfo(infos, {}, resourceProvider.pathContext, packageRoot);
-
-    var contents = [];
-    for (var unitInfo in infos!) {
-      contents.add(UnitRenderer(unitInfo, migrationInfo,
-              PathMapper(resourceProvider), 'AUTH_TOKEN')
-          .render());
-    }
-    return contents;
-  }
-
-  Future test_editList_containsCount() async {
-    await buildInfoForSingleTestFile('''
-int a = null;
-bool b = a.isEven;
-''', migratedContent: '''
-int? a = null;
-bool  b = a!.isEven;
-''');
-    var output = renderUnits()[0];
-    var editList = output.edits;
-    expect(editList, hasLength(2));
-  }
-
-  Future test_editList_containsEdits() async {
-    await buildInfoForSingleTestFile('''
-int a = null;
-bool b = a.isEven;
-''', migratedContent: '''
-int? a = null;
-bool  b = a!.isEven;
-''');
-    var output = renderUnits()[0];
-    // The null checks are higher priority than the assertions.
-    expect(output.edits.keys,
-        orderedEquals(['1 null check added', '1 type made nullable']));
-    var typesMadeNullable = output.edits['1 type made nullable']!;
-    expect(typesMadeNullable, hasLength(1));
-    var typeMadeNullable = typesMadeNullable.single;
-    expect(typeMadeNullable.line, equals(1));
-    expect(typeMadeNullable.offset, equals(3));
-    expect(typeMadeNullable.explanation,
-        equals("Changed type 'int' to be nullable"));
-    var nullChecks = output.edits['1 null check added']!;
-    expect(nullChecks, hasLength(1));
-    var nullCheck = nullChecks.single;
-    expect(nullCheck.line, equals(2));
-    expect(nullCheck.offset, equals(26));
-    expect(nullCheck.explanation,
-        equals('Added a non-null assertion to nullable expression'));
-  }
-
-  Future test_editList_countsHintAcceptanceSingly() async {
-    await buildInfoForSingleTestFile('int f(int/*?*/ x) => x/*!*/;',
-        migratedContent: 'int  f(int/*?*/ x) => x/*!*/;');
-    var output = renderUnits()[0];
-    expect(
-        output.edits.keys,
-        unorderedEquals([
-          '1 null check hint converted to null check',
-          '1 nullability hint converted to ?'
-        ]));
-  }
-
-  Future test_editList_countsHintAcceptanceSingly_late() async {
-    await buildInfoForSingleTestFile('/*late*/ int x = 0;',
-        migratedContent: '/*late*/ int  x = 0;');
-    var output = renderUnits()[0];
-    expect(output.edits.keys,
-        unorderedEquals(['1 late hint converted to late keyword']));
-  }
-
-  Future test_editList_countsHintAcceptanceSingly_lateFinal() async {
-    await buildInfoForSingleTestFile('/*late final*/ int x = 0;',
-        migratedContent: '/*late final*/ int  x = 0;');
-    var output = renderUnits()[0];
-    expect(
-        output.edits.keys,
-        unorderedEquals(
-            ['1 late final hint converted to late and final keywords']));
-  }
-
-  Future test_editList_countsWhereOrNullSingly() async {
-    await buildInfoForSingleTestFile(
-        '''
-import 'package:collection/collection.dart';
-
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''',
-        removeViaComments: false,
-        migratedContent: '''
-import 'package:collection/collection.dart';
-
-int? firstEven(Iterable  x)
-    => x.firstWherefirstWhereOrNull((x) => x.isEven, orElse: () => null);
-''');
-    var output = renderUnits()[0];
-    expect(output.edits.keys,
-        unorderedEquals(['1 method name changed', '1 type made nullable']));
-  }
-
-  Future test_editList_pluralHeader() async {
-    await buildInfoForSingleTestFile('''
-int a = null;
-int b = null;
-''', migratedContent: '''
-int? a = null;
-int? b = null;
-''');
-    var output = renderUnits()[0];
-    expect(output.edits.keys.toList(), ['2 types made nullable']);
-  }
-
-  Future test_handle_large_deleted_region_near_top_of_file() async {
-    await buildInfoForSingleTestFile('''
-class C {
-  int hash(Iterable elements) {
-    if (elements == null) {
-      return null.hashCode;
-    }
-    return 0;
-  }
-}
-
-List x = [null];
-''', migratedContent: '''
-class C {
-  int  hash(Iterable? elements) {
-    if (elements == null) {
-      return null.hashCode;
-    }
-    return 0;
-  }
-}
-
-List  x = [null];
-''', removeViaComments: false);
-    renderUnits();
-    // No assertions necessary; we are checking to make sure there is no crash.
-  }
-
-  Future test_info_within_deleted_code() async {
-    await buildInfoForSingleTestFile('''
-class C {
-  int hash(Iterable elements) {
-    if (elements == null) {
-      return null.hashCode;
-    }
-    return 0;
-  }
-}
-
-List x = [null];
-''', migratedContent: '''
-class C {
-  int  hash(Iterable? elements) {
-    if (elements == null) {
-      return null.hashCode;
-    }
-    return 0;
-  }
-}
-
-List  x = [null];
-''', removeViaComments: false);
-    var output = renderUnits()[0];
-    // Strip out URLs and span IDs; they're not being tested here.
-    var navContent = output.navigationContent!
-        .replaceAll(RegExp('href="[^"]*"'), 'href="..."')
-        .replaceAll(RegExp('id="[^"]*"'), 'id="..."');
-    expect(navContent, '''
-class C {
-  int  hash(Iterable<int >? elements) {
-    if (elements == null) {
-      return null.hashCode;
-    }
-    return 0;
-  }
-}
-
-List<int?>  x = [null];
-''');
-  }
-
-  Future test_inserted_lines() async {
-    await buildInfoForSingleTestFile('''
-int f(List values)
-    => values.firstWhere((i) => i.isEven, orElse: () => null);
-''', migratedContent: '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? f(List  values)
-    => values.firstWherefirstWhereOrNull((i) => i.isEven/* , orElse: () => null */);
-''');
-    var output = renderUnits()[0];
-    var regions = output.regions!;
-    // We're not testing the correctness of the data path, so drop it.
-    regions = regions.replaceAll(RegExp(' data-path="[^"]*"'), '');
-    // Split the output into table rows.
-    var rows = regions.split(RegExp('(?=');
-    expect(
-        rows[1],
-        '1'
-        ''
-        ''
-        "import 'package:collection/collection.dart' show IterableExtension;"
-        '');
-    expect(rows[2], '(new)');
-    expect(rows[3], startsWith('(new)int'));
-    expect(rows[4],
-        startsWith('2'));
-  }
-
-  void test_kindPriorityOrder() {
-    var nonDisplayedKinds = NullabilityFixKind.values.toSet();
-    for (var kind in UnitRenderer.kindPriorityOrder) {
-      expect(nonDisplayedKinds.remove(kind), isTrue);
-    }
-    // The only kinds that should not be displayed are those associated with a
-    // place where nothing interesting occurred.
-    expect(nonDisplayedKinds, {
-      NullabilityFixKind.typeNotMadeNullable,
-      NullabilityFixKind.typeNotMadeNullableDueToHint
-    });
-  }
-
-  Future test_method_name_change() async {
-    addPackageFile('collection', 'collection.dart', '');
-    await buildInfoForSingleTestFile(
-        '''
-import 'package:collection/collection.dart';
-
-int f(List values)
-    => values.firstWhere((i) => i.isEven, orElse: () => null);
-''',
-        removeViaComments: false,
-        migratedContent: '''
-import 'package:collection/collection.dart';
-
-int? f(List  values)
-    => values.firstWherefirstWhereOrNull((i) => i.isEven, orElse: () => null);
-''');
-    var output = renderUnits()[0];
-    var regions = output.regions!;
-    // We aren't testing data-offset or data-line behaviors.
-    regions = regions.replaceAll(RegExp(' data-offset="[^"]*"'), '');
-    regions = regions.replaceAll(RegExp(' data-line="[^"]*"'), '');
-    expect(
-        regions,
-        contains('firstWhere'
-            'firstWhereOrNull('));
-  }
-
-  Future test_navContentContainsEscapedHtml() async {
-    await buildInfoForSingleTestFile('List a = null;',
-        migratedContent: 'List? a = null;');
-    var output = renderUnits()[0];
-    // Strip out URLs which will change; not being tested here.
-    var navContent = output.navigationContent!
-        .replaceAll(RegExp('href=".*?"'), 'href="..."');
-    expect(
-        navContent,
-        contains(r'List'
-            r'<String >? '
-            r'a = null;'));
-  }
-
-  void test_nullAwarenessUnnecessaryInStrongMode() async {
-    await buildInfoForSingleTestFile('''
-int f(String/*!*/ s) => s?.length;
-''', migratedContent: '''
-int  f(String/*!*/ s) => s?.length;
-''', warnOnWeakCode: true);
-    var output = renderUnits()[0];
-    expect(_stripDataAttributes(output.regions!),
-        contains('s?.length'));
-    expect(
-        output.edits.keys,
-        contains(
-            '1 null-aware access will be unnecessary in strong checking mode'));
-  }
-
-  Future test_outputContains_addedType() async {
-    await buildInfoForSingleTestFile('''
-void f() {
-  final a = >[];
-  a.add([null]);
-}
-''', migratedContent: '''
-void f() {
-  final List> a =  >[];
-  a.add([null]);
-}
-''');
-    var output = renderUnits()[0];
-    var regions = _stripDataAttributes(output.regions!);
-    expect(
-        regions,
-        contains('final '
-            'List<List<int?>>'
-            ' a = <List<int'
-            ' '
-            '>'
-            ' '
-            '>[];'));
-  }
-
-  Future test_outputContains_replacedVar() async {
-    await buildInfoForSingleTestFile('''
-void f() {
-  var a = >[];
-  a.add([null]);
-}
-''', migratedContent: '''
-void f() {
-  varList> a =  >[];
-  a.add([null]);
-}
-''');
-    var output = renderUnits()[0];
-    var regions = _stripDataAttributes(output.regions!);
-    expect(
-        regions,
-        contains('var'
-            'List<List<int?>>'
-            ' a = <List<int'
-            ' '
-            '>'
-            ' '
-            '>[];'));
-  }
-
-  Future test_outputContainsModifiedAndUnmodifiedRegions() async {
-    await buildInfoForSingleTestFile('int a = null;',
-        migratedContent: 'int? a = null;');
-    var output = renderUnits()[0];
-    var regions = _stripDataAttributes(output.regions!);
-    expect(regions,
-        contains('int? a = null;'));
-  }
-
-  Future test_project_with_parts() async {
-    // In this test, we migrate a library and its part file.  Both files require
-    // addition of a `?`, but at different offsets.  We make sure the `?`s get
-    // added at the correct locations in each file.
-    var files = {
-      convertPath('$projectPath/lib/a.dart'): '''
-part 'b.dart';
-
-int f() => null;
-''',
-      convertPath('$projectPath/lib/b.dart'): '''
-part of 'a.dart';
-
-int g() => null;
-''',
-    };
-    await buildInfoForTestFiles(files, includedRoot: projectPath);
-    var output = renderUnits();
-    expect(output[0].sourceCode, contains('int?'));
-    expect(output[1].sourceCode, contains('int?'));
-  }
-
-  Future test_reference_to_sdk_file_with_parts() async {
-    await buildInfoForSingleTestFile('''
-import 'dart:async';
-Future f(Future x) {
-  return x.whenComplete(() {});
-}
-''', migratedContent: '''
-import 'dart:async';
-Future  f(Future  x) {
-  return x.whenComplete(() {});
-}
-''');
-    renderUnits();
-    // No assertions; we're just making sure there's no crash.
-  }
-
-  Future test_regionsContainsEscapedHtml_ampersand() async {
-    await buildInfoForSingleTestFile('bool a = true && false;',
-        migratedContent: 'bool  a = true && false;');
-    var output = renderUnits()[0];
-    expect(
-        output.regions,
-        contains('bool  a = true && false;'));
-  }
-
-  Future test_regionsContainsEscapedHtml_betweenRegions() async {
-    await buildInfoForSingleTestFile('List a = null;',
-        migratedContent: 'List? a = null;');
-    var output = renderUnits()[0];
-    var regions = _stripDataAttributes(output.regions!);
-    expect(
-        regions,
-        contains(
-            'List<String >'
-            '? a = null;'));
-  }
-
-  Future test_regionsContainsEscapedHtml_region() async {
-    await buildInfoForSingleTestFile('f(List a) => a.join(",");',
-        migratedContent: 'f(List  a) => a.join(",");');
-    var output = renderUnits()[0];
-    var regions = _stripDataAttributes(output.regions!);
-    expect(
-        regions,
-        contains(
-            'List<String '
-            '> '));
-  }
-
-  /// Strip out data attributes which are not being tested here.
-  String _stripDataAttributes(String html) =>
-      html.replaceAll(RegExp(' data-[^=]+="[^"]+"'), '');
-}
diff --git a/pkg/nnbd_migration/test/instrumentation_test.dart b/pkg/nnbd_migration/test/instrumentation_test.dart
deleted file mode 100644
index adc6cf3d4882..000000000000
--- a/pkg/nnbd_migration/test/instrumentation_test.dart
+++ /dev/null
@@ -1,1225 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/analysis/results.dart';
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer/src/test_utilities/find_node.dart';
-import 'package:nnbd_migration/fix_reason_target.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'abstract_context.dart';
-import 'api_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(_InstrumentationTest);
-  });
-}
-
-class _InstrumentationClient implements NullabilityMigrationInstrumentation {
-  final _InstrumentationTestBase test;
-
-  _InstrumentationClient(this.test);
-
-  @override
-  void changes(Source source, Map> changes) {
-    expect(test.changes, isNull);
-    test.changes = {
-      for (var entry in changes.entries)
-        if (entry.value.any((edit) => !edit.isInformative))
-          entry.key: entry.value
-    };
-  }
-
-  @override
-  void explicitTypeNullability(Source? source, TypeAnnotation typeAnnotation,
-      NullabilityNodeInfo? node) {
-    expect(source, test.source);
-    expect(test.explicitTypeNullability, isNot(contains(typeAnnotation)));
-    test.explicitTypeNullability[typeAnnotation] = node;
-  }
-
-  @override
-  void externalDecoratedType(Element element, DecoratedTypeInfo decoratedType) {
-    expect(test.externalDecoratedType, isNot(contains(element)));
-    test.externalDecoratedType[element] = decoratedType;
-  }
-
-  @override
-  void externalDecoratedTypeParameterBound(
-      TypeParameterElement typeParameter, DecoratedTypeInfo decoratedType) {
-    expect(test.externalDecoratedTypeParameterBound,
-        isNot(contains(typeParameter)));
-    test.externalDecoratedTypeParameterBound[typeParameter] = decoratedType;
-  }
-
-  @override
-  void finished() {}
-
-  @override
-  void graphEdge(EdgeInfo edge, EdgeOriginInfo originInfo) {
-    if (edge.destinationNode != test.always) {
-      expect(test.edgeOrigin, isNot(contains(edge)));
-      test.edges.add(edge);
-      test.edgeOrigin[edge] = originInfo;
-    }
-  }
-
-  @override
-  void immutableNodes(NullabilityNodeInfo never, NullabilityNodeInfo always) {
-    test.never = never;
-    test.always = always;
-  }
-
-  @override
-  void implicitReturnType(
-      Source? source, AstNode node, DecoratedTypeInfo? decoratedReturnType) {
-    expect(source, test.source);
-    expect(test.implicitReturnType, isNot(contains(node)));
-    test.implicitReturnType[node] = decoratedReturnType;
-  }
-
-  @override
-  void implicitType(
-      Source? source, AstNode? node, DecoratedTypeInfo decoratedType) {
-    expect(source, test.source);
-    expect(test.implicitType, isNot(contains(node)));
-    test.implicitType[node] = decoratedType;
-  }
-
-  @override
-  void implicitTypeArguments(
-      Source? source, AstNode node, Iterable types) {
-    expect(source, test.source);
-    expect(test.implicitTypeArguments, isNot(contains(node)));
-    test.implicitTypeArguments[node] = types.toList();
-  }
-
-  @override
-  void prepareForUpdate() {
-    test.changes = null;
-  }
-}
-
-@reflectiveTest
-class _InstrumentationTest extends _InstrumentationTestBase {}
-
-abstract class _InstrumentationTestBase extends AbstractContextTest {
-  NullabilityNodeInfo? always;
-
-  final Map explicitTypeNullability = {};
-
-  final Map externalDecoratedType = {};
-
-  final Map
-      externalDecoratedTypeParameterBound = {};
-
-  final List edges = [];
-
-  Map>? changes;
-
-  final Map implicitReturnType = {};
-
-  final Map implicitType = {};
-
-  final Map> implicitTypeArguments = {};
-
-  NullabilityNodeInfo? never;
-
-  final Map edgeOrigin = {};
-
-  late FindNode findNode;
-
-  Source? source;
-
-  Future analyze(String content,
-      {bool removeViaComments = false, bool warnOnWeakCode = true}) async {
-    var sourcePath = convertPath('$testsPath/lib/test.dart');
-    newFile(sourcePath, content);
-    var listener = TestMigrationListener();
-    var migration = NullabilityMigration(listener,
-        instrumentation: _InstrumentationClient(this),
-        removeViaComments: removeViaComments,
-        warnOnWeakCode: warnOnWeakCode);
-    var result =
-        await session.getResolvedUnit(sourcePath) as ResolvedUnitResult;
-    source = result.unit.declaredElement!.source;
-    findNode = FindNode(content, result.unit);
-    migration.prepareInput(result);
-    expect(migration.unmigratedDependencies, isEmpty);
-    migration.processInput(result);
-    migration.finalizeInput(result);
-    migration.finish();
-  }
-
-  void assertEdit(AtomicEdit edit,
-      {dynamic description = anything, dynamic fixReasons = anything}) {
-    var info = edit.info!;
-    expect(info.description, description);
-    expect(info.fixReasons, fixReasons);
-  }
-
-  Future test_explicitTypeNullability() async {
-    var content = '''
-int x = 1;
-int y = null;
-''';
-    await analyze(content);
-    expect(
-        explicitTypeNullability[findNode.typeAnnotation('int x')]!.isNullable,
-        false);
-    expect(
-        explicitTypeNullability[findNode.typeAnnotation('int y')]!.isNullable,
-        true);
-  }
-
-  Future test_externalDecoratedType() async {
-    await analyze('''
-main() {
-  print(1);
-}
-''');
-    expect(
-        externalDecoratedType[findNode.simple('print').staticElement!]!
-            .type!
-            .getDisplayString(withNullability: false),
-        'void Function(Object)');
-  }
-
-  Future test_externalDecoratedTypeParameterBound() async {
-    await analyze('''
-import 'dart:math';
-f(Point x) {}
-''');
-    var pointElement = findNode.namedType('Point').element as ClassElement;
-    var pointElementTypeParameter = pointElement.typeParameters[0];
-    expect(
-        externalDecoratedTypeParameterBound[pointElementTypeParameter]!
-            .type!
-            .getDisplayString(withNullability: false),
-        'num');
-  }
-
-  Future test_externalType_nullability_dynamic_edge() async {
-    await analyze('''
-f(List x) {}
-''');
-    var listElement = findNode.namedType('List').element as ClassElement;
-    var listElementTypeParameter = listElement.typeParameters[0];
-    var typeParameterBoundNode =
-        externalDecoratedTypeParameterBound[listElementTypeParameter]!.node;
-    var edge = edges
-        .where((e) =>
-            e.sourceNode == always &&
-            e.destinationNode == typeParameterBoundNode)
-        .single;
-    var origin = edgeOrigin[edge]!;
-    expect(origin.kind, EdgeOriginKind.alwaysNullableType);
-    expect(origin.element, same(listElementTypeParameter));
-    expect(origin.source, null);
-    expect(origin.node, null);
-  }
-
-  Future test_fix_reason_add_required_function() async {
-    var content = '_f({int/*!*/ i) {}';
-    await analyze(content);
-    var intAnnotation = findNode.typeAnnotation('int');
-    var intPos = content.indexOf('int');
-    var commentPos = content.indexOf('/*');
-    expect(changes!.keys, unorderedEquals([intPos, commentPos]));
-    assertEdit(changes![intPos]!.single,
-        description: NullabilityFixDescription.addRequired(null, '_f', 'i'),
-        fixReasons: {
-          FixReasonTarget.root: same(explicitTypeNullability[intAnnotation])
-        });
-  }
-
-  Future test_fix_reason_add_required_method() async {
-    var content = 'class C { _f({int/*!*/ i) {} }';
-    await analyze(content);
-    var intAnnotation = findNode.typeAnnotation('int');
-    var intPos = content.indexOf('int');
-    var commentPos = content.indexOf('/*');
-    expect(changes!.keys, unorderedEquals([intPos, commentPos]));
-    assertEdit(changes![intPos]!.single,
-        description: NullabilityFixDescription.addRequired('C', '_f', 'i'),
-        fixReasons: {
-          FixReasonTarget.root: same(explicitTypeNullability[intAnnotation])
-        });
-  }
-
-  Future test_fix_reason_discard_condition() async {
-    var content = '''
-_f(int/*!*/ i) {
-  if (i != null) {
-    return i;
-  }
-}
-''';
-    await analyze(content, warnOnWeakCode: false);
-    var intAnnotation = findNode.typeAnnotation('int');
-    var commentPos = content.indexOf('/*');
-    var ifPos = content.indexOf('if');
-    var afterReturnPos = content.indexOf('i;') + 2;
-    expect(changes!.keys, unorderedEquals([commentPos, ifPos, afterReturnPos]));
-    var expectedFixReasons = {
-      FixReasonTarget.root: same(explicitTypeNullability[intAnnotation])
-    };
-    assertEdit(changes![ifPos]!.single,
-        description: NullabilityFixDescription.discardCondition,
-        fixReasons: expectedFixReasons);
-    assertEdit(changes![afterReturnPos]!.single,
-        description: NullabilityFixDescription.discardCondition,
-        fixReasons: expectedFixReasons);
-  }
-
-  Future test_fix_reason_discard_condition_no_block() async {
-    var content = '''
-_f(int/*!*/ i) {
-  if (i != null) return i;
-}
-''';
-    await analyze(content, warnOnWeakCode: false);
-    var intAnnotation = findNode.typeAnnotation('int');
-    var commentPos = content.indexOf('/*');
-    var ifPos = content.indexOf('if');
-    expect(changes!.keys, unorderedEquals([commentPos, ifPos]));
-    assertEdit(changes![ifPos]!.single,
-        description: NullabilityFixDescription.discardCondition,
-        fixReasons: {
-          FixReasonTarget.root: same(explicitTypeNullability[intAnnotation])
-        });
-  }
-
-  Future test_fix_reason_discard_else() async {
-    var content = '''
-_f(int/*!*/ i) {
-  if (i != null) {
-    return i;
-  } else {
-    return 'null';
-  }
-}
-''';
-    await analyze(content, warnOnWeakCode: false);
-    var intAnnotation = findNode.typeAnnotation('int');
-    var commentPos = content.indexOf('/*');
-    var ifPos = content.indexOf('if');
-    var afterReturnPos = content.indexOf('i;') + 2;
-    expect(changes!.keys, unorderedEquals([commentPos, ifPos, afterReturnPos]));
-    var expectedFixReasons = {
-      FixReasonTarget.root: same(explicitTypeNullability[intAnnotation])
-    };
-    assertEdit(changes![ifPos]!.single,
-        description: NullabilityFixDescription.discardCondition,
-        fixReasons: expectedFixReasons);
-    assertEdit(changes![afterReturnPos]!.single,
-        description: NullabilityFixDescription.discardElse,
-        fixReasons: expectedFixReasons);
-  }
-
-  Future test_fix_reason_discard_else_empty_then() async {
-    var content = '''
-_f(int/*!*/ i) {
-  if (i != null) {} else {
-    return 'null';
-  }
-}
-''';
-    await analyze(content, warnOnWeakCode: false);
-    var intAnnotation = findNode.typeAnnotation('int');
-    var commentPos = content.indexOf('/*');
-    var bodyPos = content.indexOf('i) {') + 4;
-    expect(changes!.keys, unorderedEquals([commentPos, bodyPos]));
-    assertEdit(changes![bodyPos]!.single,
-        description: NullabilityFixDescription.discardIf,
-        fixReasons: {
-          FixReasonTarget.root: same(explicitTypeNullability[intAnnotation])
-        });
-  }
-
-  Future test_fix_reason_discard_then() async {
-    var content = '''
-_f(int/*!*/ i) {
-  if (i == null) {
-    return 'null';
-  } else {
-    return i;
-  }
-}
-''';
-    await analyze(content, warnOnWeakCode: false);
-    var intAnnotation = findNode.typeAnnotation('int');
-    var commentPos = content.indexOf('/*');
-    var ifPos = content.indexOf('if');
-    var afterReturnPos = content.indexOf('i;') + 2;
-    expect(changes!.keys, unorderedEquals([commentPos, ifPos, afterReturnPos]));
-    var expectedFixReasons = {
-      FixReasonTarget.root: same(explicitTypeNullability[intAnnotation])
-    };
-    assertEdit(changes![ifPos]!.single,
-        description: NullabilityFixDescription.discardThen,
-        fixReasons: expectedFixReasons);
-    assertEdit(changes![afterReturnPos]!.single,
-        description: NullabilityFixDescription.discardThen,
-        fixReasons: expectedFixReasons);
-  }
-
-  Future test_fix_reason_discard_then_no_else() async {
-    var content = '''
-_f(int/*!*/ i) {
-  if (i == null) {
-    return 'null';
-  }
-}
-''';
-    await analyze(content, warnOnWeakCode: false);
-    var intAnnotation = findNode.typeAnnotation('int');
-    var commentPos = content.indexOf('/*');
-    var bodyPos = content.indexOf('i) {') + 4;
-    expect(changes!.keys, unorderedEquals([commentPos, bodyPos]));
-    assertEdit(changes![bodyPos]!.single,
-        description: NullabilityFixDescription.discardIf,
-        fixReasons: {
-          FixReasonTarget.root: same(explicitTypeNullability[intAnnotation])
-        });
-  }
-
-  Future test_fix_reason_edge() async {
-    await analyze('''
-void f(int x) {
-  print(x.isEven);
-}
-void g(int y, bool b) {
-  if (b) {
-    f(y);
-  }
-}
-main() {
-  g(null, false);
-}
-''');
-    var yUsage = findNode.simple('y);');
-    var edit = changes![yUsage.end]!.single;
-    expect(edit.isInsertion, true);
-    expect(edit.replacement, '!');
-    var info = edit.info!;
-    expect(info.description, NullabilityFixDescription.checkExpression);
-    var reasons = info.fixReasons;
-    expect(reasons, hasLength(1));
-    var edge = reasons[FixReasonTarget.root] as EdgeInfo;
-    expect(edge.sourceNode,
-        same(explicitTypeNullability[findNode.typeAnnotation('int y')]));
-    expect(edge.destinationNode,
-        same(explicitTypeNullability[findNode.typeAnnotation('int x')]));
-    expect(edge.isSatisfied, false);
-    expect(edgeOrigin[edge]!.node, same(yUsage));
-  }
-
-  Future test_fix_reason_node() async {
-    await analyze('''
-int x = null;
-''');
-    var intAnnotation = findNode.typeAnnotation('int');
-    var entries = changes!.entries.toList();
-    expect(entries, hasLength(1));
-    expect(entries.single.key, intAnnotation.end);
-    var edit = entries.single.value.single;
-    expect(edit.isInsertion, true);
-    expect(edit.replacement, '?');
-    var info = edit.info!;
-    expect(info.description, NullabilityFixDescription.makeTypeNullable('int'));
-    var reasons = info.fixReasons;
-    expect(reasons, hasLength(1));
-    expect(reasons[FixReasonTarget.root],
-        same(explicitTypeNullability[intAnnotation]));
-  }
-
-  Future test_fix_reason_remove_question_from_question_dot() async {
-    var content = '_f(int/*!*/ i) => i?.isEven;';
-    await analyze(content, warnOnWeakCode: false);
-    var commentPos = content.indexOf('/*');
-    var questionDotPos = content.indexOf('?.');
-    expect(changes!.keys, unorderedEquals([commentPos, questionDotPos]));
-    assertEdit(changes![questionDotPos]!.single,
-        description: NullabilityFixDescription.removeNullAwareness,
-        fixReasons: isEmpty);
-  }
-
-  Future
-      test_fix_reason_remove_question_from_question_dot_method() async {
-    var content = '_f(int/*!*/ i) => i?.abs();';
-    await analyze(content, warnOnWeakCode: false);
-    var commentPos = content.indexOf('/*');
-    var questionDotPos = content.indexOf('?.');
-    expect(changes!.keys, unorderedEquals([commentPos, questionDotPos]));
-    assertEdit(changes![questionDotPos]!.single,
-        description: NullabilityFixDescription.removeNullAwareness,
-        fixReasons: isEmpty);
-  }
-
-  Future test_fix_reason_remove_unnecessary_cast() async {
-    await analyze('''
-_f(Object x) {
-  if (x is! int) return;
-  print((x as int) + 1);
-}
-''');
-    var xRef = findNode.simple('x as');
-    var asExpression = xRef.parent as Expression;
-    expect(changes, hasLength(3));
-    // Change #1: drop the `(` before the cast
-    var dropLeadingParen = changes![asExpression.offset - 1]!.single;
-    expect(dropLeadingParen.isDeletion, true);
-    expect(dropLeadingParen.length, 1);
-    expect(dropLeadingParen.info, null);
-    // Change #2: drop the text ` as int`
-    var dropAsInt = changes![xRef.end]!.single;
-    expect(dropAsInt.isDeletion, true);
-    expect(dropAsInt.length, 7);
-    expect(dropAsInt.info!.description, NullabilityFixDescription.removeAs);
-    expect(dropAsInt.info!.fixReasons, isEmpty);
-    // Change #3: drop the `)` after the cast
-    var dropTrailingParen = changes![asExpression.end]!.single;
-    expect(dropTrailingParen.isDeletion, true);
-    expect(dropTrailingParen.length, 1);
-    expect(dropTrailingParen.info, null);
-  }
-
-  Future test_fix_reason_rewrite_required() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-_f({@required int i}) {}
-''');
-    var intAnnotation = findNode.typeAnnotation('int');
-    expect(changes, isNotEmpty);
-    for (var change in changes!.values) {
-      expect(change, isNotEmpty);
-      for (var edit in change) {
-        var info = edit.info!;
-        expect(info.description,
-            NullabilityFixDescription.addRequired(null, '_f', 'i'));
-        expect(info.fixReasons[FixReasonTarget.root],
-            same(explicitTypeNullability[intAnnotation]));
-      }
-    }
-  }
-
-  Future test_graphEdge() async {
-    await analyze('''
-int f(int x) => x;
-''');
-    var xNode = explicitTypeNullability[findNode.typeAnnotation('int x')];
-    var returnNode = explicitTypeNullability[findNode.typeAnnotation('int f')];
-    expect(
-        edges.where(
-            (e) => e.sourceNode == xNode && e.destinationNode == returnNode),
-        hasLength(1));
-  }
-
-  Future test_graphEdge_guards() async {
-    await analyze('''
-int f(int i, int j) {
-  if (i == null) {
-    return j;
-  }
-  return 1;
-}
-''');
-    var iNode = explicitTypeNullability[findNode.typeAnnotation('int i')];
-    var jNode = explicitTypeNullability[findNode.typeAnnotation('int j')];
-    var returnNode = explicitTypeNullability[findNode.typeAnnotation('int f')];
-    var matchingEdges = edges
-        .where((e) => e.sourceNode == jNode && e.destinationNode == returnNode)
-        .toList();
-    expect(matchingEdges, hasLength(1));
-    expect(matchingEdges.single.guards, hasLength(1));
-    expect(matchingEdges.single.guards.single, iNode);
-  }
-
-  Future test_graphEdge_hard() async {
-    await analyze('''
-int f(int x) => x;
-''');
-    var xNode = explicitTypeNullability[findNode.typeAnnotation('int x')];
-    var returnNode = explicitTypeNullability[findNode.typeAnnotation('int f')];
-    var matchingEdges = edges
-        .where((e) => e.sourceNode == xNode && e.destinationNode == returnNode)
-        .toList();
-    expect(matchingEdges, hasLength(1));
-    expect(matchingEdges.single.isUnion, false);
-    expect(matchingEdges.single.isHard, true);
-  }
-
-  Future test_graphEdge_isSatisfied() async {
-    await analyze('''
-void f1(int i, bool b) {
-  f2(i, b);
-}
-void f2(int j, bool b) {
-  if (b) {
-    f3(j);
-  }
-}
-void f3(int k) {
-  f4(k);
-}
-void f4(int l) {
-  print(l.isEven);
-}
-main() {
-  f1(null, false);
-}
-''');
-    var iNode = explicitTypeNullability[findNode.typeAnnotation('int i')]!;
-    var jNode = explicitTypeNullability[findNode.typeAnnotation('int j')]!;
-    var kNode = explicitTypeNullability[findNode.typeAnnotation('int k')]!;
-    var lNode = explicitTypeNullability[findNode.typeAnnotation('int l')]!;
-    var iToJ = edges
-        .where((e) => e.sourceNode == iNode && e.destinationNode == jNode)
-        .single;
-    var jToK = edges
-        .where((e) => e.sourceNode == jNode && e.destinationNode == kNode)
-        .single;
-    var kToL = edges
-        .where((e) => e.sourceNode == kNode && e.destinationNode == lNode)
-        .single;
-    expect(iNode.isNullable, true);
-    expect(jNode.isNullable, true);
-    expect(kNode.isNullable, false);
-    expect(lNode.isNullable, false);
-    expect(iToJ.isSatisfied, true);
-    expect(jToK.isSatisfied, false);
-    expect(kToL.isSatisfied, true);
-  }
-
-  Future test_graphEdge_isUpstreamTriggered() async {
-    await analyze('''
-void f(int i, bool b) {
-  assert(i != null);
-  i.isEven; // unconditional
-  g(i);
-  h(i);
-  if (b) {
-    i.isEven; // conditional
-  }
-}
-void g(int/*?*/ j) {}
-void h(int k) {}
-''');
-    var iNode = explicitTypeNullability[findNode.typeAnnotation('int i')];
-    var jNode = explicitTypeNullability[findNode.typeAnnotation('int/*?*/ j')];
-    var kNode = explicitTypeNullability[findNode.typeAnnotation('int k')];
-    var assertNode = findNode.statement('assert');
-    var unconditionalUsageNode = findNode.simple('i.isEven; // unconditional');
-    var conditionalUsageNode = findNode.simple('i.isEven; // conditional');
-    var nonNullEdges = edgeOrigin.entries
-        .where((entry) =>
-            entry.key.sourceNode == iNode && entry.key.destinationNode == never)
-        .toList();
-    var assertEdge = nonNullEdges
-        .where((entry) => entry.value.node == assertNode)
-        .single
-        .key;
-    var unconditionalUsageEdge = edgeOrigin.entries
-        .where((entry) => entry.value.node == unconditionalUsageNode)
-        .single
-        .key;
-    var gCallEdge = edges
-        .where((e) => e.sourceNode == iNode && e.destinationNode == jNode)
-        .single;
-    var hCallEdge = edges
-        .where((e) => e.sourceNode == iNode && e.destinationNode == kNode)
-        .single;
-    var conditionalUsageEdge = edgeOrigin.entries
-        .where((entry) => entry.value.node == conditionalUsageNode)
-        .single
-        .key;
-    // Both assertEdge and unconditionalUsageEdge are upstream triggered because
-    // either of them would have been sufficient to cause i to be marked as
-    // non-nullable.
-    expect(assertEdge.isUpstreamTriggered, true);
-    expect(unconditionalUsageEdge.isUpstreamTriggered, true);
-    // conditionalUsageEdge is not upstream triggered because it is a soft edge,
-    // so it would not have caused i to be marked as non-nullable.
-    expect(conditionalUsageEdge.isUpstreamTriggered, false);
-    // Even though gCallEdge is a hard edge, it is not upstream triggered
-    // because its destination node is nullable.
-    expect(gCallEdge.isHard, true);
-    expect(gCallEdge.isUpstreamTriggered, false);
-    // Even though hCallEdge is a hard edge and its destination node is
-    // non-nullable, it is not upstream triggered because k could have been made
-    // nullable without causing any problems, so the presence of this edge would
-    // not have caused i to be marked as non-nullable.
-    expect(hCallEdge.isHard, true);
-    expect(hCallEdge.isUpstreamTriggered, false);
-  }
-
-  Future test_graphEdge_origin() async {
-    await analyze('''
-int f(int x) => x;
-''');
-    var xNode = explicitTypeNullability[findNode.typeAnnotation('int x')];
-    var returnNode = explicitTypeNullability[findNode.typeAnnotation('int f')];
-    var matchingEdges = edges
-        .where((e) => e.sourceNode == xNode && e.destinationNode == returnNode)
-        .toList();
-    var origin = edgeOrigin[matchingEdges.single]!;
-    expect(origin.source, source);
-    expect(origin.node, findNode.simple('x;'));
-  }
-
-  Future test_graphEdge_origin_dynamic_assignment() async {
-    await analyze('''
-int f(dynamic x) => x;
-''');
-    var xNode = explicitTypeNullability[findNode.typeAnnotation('dynamic x')];
-    var returnNode = explicitTypeNullability[findNode.typeAnnotation('int f')];
-    var matchingEdges = edges
-        .where((e) => e.sourceNode == xNode && e.destinationNode == returnNode)
-        .toList();
-    var origin = edgeOrigin[matchingEdges.single]!;
-    expect(origin.kind, EdgeOriginKind.dynamicAssignment);
-    expect(origin.source, source);
-    expect(origin.node, findNode.simple('x;'));
-  }
-
-  Future test_graphEdge_soft() async {
-    await analyze('''
-int f(int x, bool b) {
-  if (b) return x;
-  return 0;
-}
-''');
-    var xNode = explicitTypeNullability[findNode.typeAnnotation('int x')];
-    var returnNode = explicitTypeNullability[findNode.typeAnnotation('int f')];
-    var matchingEdges = edges
-        .where((e) => e.sourceNode == xNode && e.destinationNode == returnNode)
-        .toList();
-    expect(matchingEdges, hasLength(1));
-    expect(matchingEdges.single.isUnion, false);
-    expect(matchingEdges.single.isHard, false);
-  }
-
-  Future test_immutableNode_always() async {
-    await analyze('''
-int x = null;
-''');
-    expect(always!.isImmutable, true);
-    expect(always!.isNullable, true);
-    var xNode = explicitTypeNullability[findNode.typeAnnotation('int')];
-    var edge = edges.where((e) => e.destinationNode == xNode).single;
-    var edgeSource = edge.sourceNode;
-    var upstreamEdge =
-        edges.where((e) => e.destinationNode == edgeSource).single;
-    expect(upstreamEdge.sourceNode, always);
-  }
-
-  Future test_immutableNode_never() async {
-    await analyze('''
-bool f(int x) => x.isEven;
-''');
-    expect(never!.isImmutable, true);
-    expect(never!.isNullable, false);
-    var xNode = explicitTypeNullability[findNode.typeAnnotation('int')];
-    var edge = edges.where((e) => e.sourceNode == xNode).single;
-    expect(edge.destinationNode, never);
-  }
-
-  Future test_implicitReturnType_constructor() async {
-    await analyze('''
-class C {
-  factory C() => f(true);
-  C.named();
-}
-C f(bool b) => b ? C.named() : null;
-''');
-    var factoryReturnNode =
-        implicitReturnType[findNode.constructor('C(')]!.node;
-    var fReturnNode = explicitTypeNullability[findNode.typeAnnotation('C f')];
-    expect(
-        edges.where((e) =>
-            e.sourceNode == fReturnNode &&
-            e.destinationNode == factoryReturnNode),
-        hasLength(1));
-  }
-
-  Future test_implicitReturnType_formalParameter() async {
-    await analyze('''
-Object f(callback()) => callback();
-''');
-    var paramReturnNode = implicitReturnType[
-            findNode.functionTypedFormalParameter('callback())')]!
-        .node;
-    var fReturnNode =
-        explicitTypeNullability[findNode.typeAnnotation('Object')];
-    expect(
-        edges.where((e) =>
-            e.sourceNode == paramReturnNode &&
-            e.destinationNode == fReturnNode),
-        hasLength(1));
-  }
-
-  Future test_implicitReturnType_function() async {
-    await analyze('''
-f() => 1;
-Object g() => f();
-''');
-    var fReturnNode =
-        implicitReturnType[findNode.functionDeclaration('f() =>')]!.node;
-    var gReturnNode =
-        explicitTypeNullability[findNode.typeAnnotation('Object')];
-    expect(
-        edges.where((e) =>
-            e.sourceNode == fReturnNode && e.destinationNode == gReturnNode),
-        hasLength(1));
-  }
-
-  Future test_implicitReturnType_functionExpression() async {
-    await analyze('''
-main() {
-  int Function() f = () => g();
-}
-int g() => 1;
-''');
-    var fReturnNode =
-        explicitTypeNullability[findNode.typeAnnotation('int Function')];
-    var functionExpressionReturnNode =
-        implicitReturnType[findNode.functionExpression('() => g()')]!.node;
-    var gReturnNode = explicitTypeNullability[findNode.typeAnnotation('int g')];
-    expect(
-        edges.where((e) =>
-            e.sourceNode == gReturnNode &&
-            e.destinationNode == functionExpressionReturnNode),
-        hasLength(1));
-    expect(
-        edges.where((e) =>
-            e.sourceNode == functionExpressionReturnNode &&
-            e.destinationNode == fReturnNode),
-        hasLength(1));
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/39370')
-  Future test_implicitReturnType_functionTypeAlias() async {
-    await analyze('''
-typedef F();
-Object f(F callback) => callback();
-''');
-    var typedefReturnNode =
-        implicitReturnType[findNode.functionTypeAlias('F()')]!.node;
-    var fReturnNode =
-        explicitTypeNullability[findNode.typeAnnotation('Object')];
-    expect(
-        edges.where((e) =>
-            e.sourceNode == typedefReturnNode &&
-            e.destinationNode == fReturnNode),
-        hasLength(1));
-  }
-
-  Future test_implicitReturnType_genericFunctionType() async {
-    await analyze('''
-Object f(Function() callback) => callback();
-''');
-    var callbackReturnNode =
-        implicitReturnType[findNode.genericFunctionType('Function()')]!.node;
-    var fReturnNode =
-        explicitTypeNullability[findNode.typeAnnotation('Object')];
-    expect(
-        edges.where((e) =>
-            e.sourceNode == callbackReturnNode &&
-            e.destinationNode == fReturnNode),
-        hasLength(1));
-  }
-
-  Future test_implicitReturnType_method() async {
-    await analyze('''
-abstract class Base {
-  int f();
-}
-abstract class Derived extends Base {
-  f /*derived*/();
-}
-''');
-    var baseReturnNode =
-        explicitTypeNullability[findNode.typeAnnotation('int')];
-    var derivedReturnNode =
-        implicitReturnType[findNode.methodDeclaration('f /*derived*/')]!.node;
-    expect(
-        edges.where((e) =>
-            e.sourceNode == derivedReturnNode &&
-            e.destinationNode == baseReturnNode),
-        hasLength(1));
-  }
-
-  Future test_implicitType_catch_exception() async {
-    await analyze('''
-void f() {
-  try {} catch (e) {
-    Object o = e;
-  }
-}
-''');
-    var oNode = explicitTypeNullability[findNode.typeAnnotation('Object')];
-    var eNode = implicitType[findNode.catchClauseParameter('e)')]!.node;
-    expect(
-        edges.where((e) => e.sourceNode == eNode && e.destinationNode == oNode),
-        hasLength(1));
-  }
-
-  Future test_implicitType_catch_stackTrace() async {
-    await analyze('''
-void f() {
-  try {} catch (e, st) {
-    Object o = st;
-  }
-}
-''');
-    var oNode = explicitTypeNullability[findNode.typeAnnotation('Object')];
-    var stNode = implicitType[findNode.catchClauseParameter('st)')]!.node;
-    expect(
-        edges
-            .where((e) => e.sourceNode == stNode && e.destinationNode == oNode),
-        hasLength(1));
-  }
-
-  Future
-      test_implicitType_declaredIdentifier_forEachPartsWithDeclaration() async {
-    await analyze('''
-void f(List l) {
-  for (var x in l) {
-    int y = x;
-  }
-}
-''');
-    var xNode = implicitType[(findNode.forStatement('for').forLoopParts
-                as ForEachPartsWithDeclaration)
-            .loopVariable]!
-        .node;
-    var yNode = explicitTypeNullability[findNode.typeAnnotation('int y')];
-    expect(
-        edges.where((e) => e.sourceNode == xNode && e.destinationNode == yNode),
-        hasLength(1));
-  }
-
-  Future test_implicitType_formalParameter() async {
-    await analyze('''
-abstract class Base {
-  void f(int i);
-}
-abstract class Derived extends Base {
-  void f(i); /*derived*/
-}
-''');
-    var baseParamNode =
-        explicitTypeNullability[findNode.typeAnnotation('int i')];
-    var derivedParamNode =
-        implicitType[findNode.simpleParameter('i); /*derived*/')]!.node;
-    expect(
-        edges.where((e) =>
-            e.sourceNode == baseParamNode &&
-            e.destinationNode == derivedParamNode),
-        hasLength(1));
-  }
-
-  Future test_implicitType_namedParameter() async {
-    await analyze('''
-abstract class Base {
-  void f(void callback({int i}));
-}
-abstract class Derived extends Base {
-  void f(callback);
-}
-''');
-    var baseParamParamNode =
-        explicitTypeNullability[findNode.typeAnnotation('int i')];
-    var derivedParamParamNode =
-        implicitType[findNode.simpleParameter('callback)')]!
-            .namedParameter('i')!
-            .node;
-    expect(
-        edges.where((e) =>
-            e.sourceNode == baseParamParamNode &&
-            e.destinationNode == derivedParamParamNode),
-        hasLength(1));
-  }
-
-  Future test_implicitType_positionalParameter() async {
-    await analyze('''
-abstract class Base {
-  void f(void callback(int i));
-}
-abstract class Derived extends Base {
-  void f(callback);
-}
-''');
-    var baseParamParamNode =
-        explicitTypeNullability[findNode.typeAnnotation('int i')];
-    var derivedParamParamNode =
-        implicitType[findNode.simpleParameter('callback)')]!
-            .positionalParameter(0)!
-            .node;
-    expect(
-        edges.where((e) =>
-            e.sourceNode == baseParamParamNode &&
-            e.destinationNode == derivedParamParamNode),
-        hasLength(1));
-  }
-
-  Future test_implicitType_returnType() async {
-    await analyze('''
-abstract class Base {
-  void f(int callback());
-}
-abstract class Derived extends Base {
-  void f(callback);
-}
-''');
-    var baseParamReturnNode =
-        explicitTypeNullability[findNode.typeAnnotation('int callback')];
-    var derivedParamReturnNode =
-        implicitType[findNode.simpleParameter('callback)')]!.returnType!.node;
-    expect(
-        edges.where((e) =>
-            e.sourceNode == baseParamReturnNode &&
-            e.destinationNode == derivedParamReturnNode),
-        hasLength(1));
-  }
-
-  Future test_implicitType_typeArgument() async {
-    await analyze('''
-abstract class Base {
-  void f(List x);
-}
-abstract class Derived extends Base {
-  void f(x); /*derived*/
-}
-''');
-    var baseParamArgNode =
-        explicitTypeNullability[findNode.typeAnnotation('int>')];
-    var derivedParamArgNode =
-        implicitType[findNode.simpleParameter('x); /*derived*/')]!
-            .typeArgument(0)!
-            .node;
-    expect(
-        edges.where((e) =>
-            e.sourceNode == baseParamArgNode &&
-            e.destinationNode == derivedParamArgNode),
-        hasLength(1));
-  }
-
-  Future test_implicitType_variableDeclarationList() async {
-    await analyze('''
-void f(int i) {
-  var j = i;
-}
-''');
-    var iNode = explicitTypeNullability[findNode.typeAnnotation('int')];
-    var jNode = implicitType[findNode.variableDeclarationList('j')]!.node;
-    expect(
-        edges.where((e) => e.sourceNode == iNode && e.destinationNode == jNode),
-        hasLength(1));
-  }
-
-  Future test_implicitTypeArguments_genericFunctionCall() async {
-    await analyze('''
-List g(T t) {}
-List f() => g(null);
-''');
-    var implicitInvocationTypeArgumentNode =
-        implicitTypeArguments[findNode.methodInvocation('g(null)')]!
-            .single
-            .node;
-    var returnElementNode =
-        explicitTypeNullability[findNode.typeAnnotation('int')];
-    expect(edges.where((e) {
-      var destination = e.destinationNode;
-      return _isPointedToByAlways(e.sourceNode) &&
-          destination is SubstitutionNodeInfo &&
-          destination.innerNode == implicitInvocationTypeArgumentNode;
-    }), hasLength(1));
-    expect(edges.where((e) {
-      var source = e.sourceNode;
-      return source is SubstitutionNodeInfo &&
-          source.innerNode == implicitInvocationTypeArgumentNode &&
-          e.destinationNode == returnElementNode;
-    }), hasLength(1));
-  }
-
-  Future test_implicitTypeArguments_genericMethodCall() async {
-    await analyze('''
-class C {
-  List g(T t) {}
-}
-List f(C c) => c.g(null);
-''');
-    var implicitInvocationTypeArgumentNode =
-        implicitTypeArguments[findNode.methodInvocation('c.g(null)')]!
-            .single
-            .node;
-    var returnElementNode =
-        explicitTypeNullability[findNode.typeAnnotation('int')];
-    expect(edges.where((e) {
-      var destination = e.destinationNode;
-      return _isPointedToByAlways(e.sourceNode) &&
-          destination is SubstitutionNodeInfo &&
-          destination.innerNode == implicitInvocationTypeArgumentNode;
-    }), hasLength(1));
-    expect(edges.where((e) {
-      var source = e.sourceNode;
-      return source is SubstitutionNodeInfo &&
-          source.innerNode == implicitInvocationTypeArgumentNode &&
-          e.destinationNode == returnElementNode;
-    }), hasLength(1));
-  }
-
-  Future test_implicitTypeArguments_instanceCreationExpression() async {
-    await analyze('''
-class C {
-  C(T t);
-}
-C f() => C(null);
-''');
-    var implicitInvocationTypeArgumentNode =
-        implicitTypeArguments[findNode.instanceCreation('C(null)')]!
-            .single
-            .node;
-    var returnElementNode =
-        explicitTypeNullability[findNode.typeAnnotation('int')];
-    expect(edges.where((e) {
-      var destination = e.destinationNode;
-      return _isPointedToByAlways(e.sourceNode) &&
-          destination is SubstitutionNodeInfo &&
-          destination.innerNode == implicitInvocationTypeArgumentNode;
-    }), hasLength(1));
-    expect(
-        edges.where((e) =>
-            e.sourceNode == implicitInvocationTypeArgumentNode &&
-            e.destinationNode == returnElementNode),
-        hasLength(1));
-  }
-
-  Future test_implicitTypeArguments_listLiteral() async {
-    await analyze('''
-List f() => [null];
-''');
-    var implicitListLiteralElementNode =
-        implicitTypeArguments[findNode.listLiteral('[null]')]!.single.node;
-    var returnElementNode =
-        explicitTypeNullability[findNode.typeAnnotation('int')];
-    expect(
-        edges.where((e) =>
-            _isPointedToByAlways(e.sourceNode) &&
-            e.destinationNode == implicitListLiteralElementNode),
-        hasLength(1));
-    expect(
-        edges.where((e) =>
-            e.sourceNode == implicitListLiteralElementNode &&
-            e.destinationNode == returnElementNode),
-        hasLength(1));
-  }
-
-  Future test_implicitTypeArguments_mapLiteral() async {
-    await analyze('''
-Map f() => {1: null};
-''');
-    var implicitMapLiteralTypeArguments =
-        implicitTypeArguments[findNode.setOrMapLiteral('{1: null}')]!;
-    expect(implicitMapLiteralTypeArguments, hasLength(2));
-    var implicitMapLiteralKeyNode = implicitMapLiteralTypeArguments[0].node;
-    var implicitMapLiteralValueNode = implicitMapLiteralTypeArguments[1].node;
-    var returnKeyNode = explicitTypeNullability[findNode.typeAnnotation('int')];
-    var returnValueNode =
-        explicitTypeNullability[findNode.typeAnnotation('String')];
-    expect(
-        edges.where((e) =>
-            _pointsToNeverHard(e.sourceNode) &&
-            e.destinationNode == implicitMapLiteralKeyNode),
-        hasLength(1));
-    expect(
-        edges.where((e) =>
-            e.sourceNode == implicitMapLiteralKeyNode &&
-            e.destinationNode == returnKeyNode),
-        hasLength(1));
-    expect(
-        edges.where((e) =>
-            _isPointedToByAlways(e.sourceNode) &&
-            e.destinationNode == implicitMapLiteralValueNode),
-        hasLength(1));
-    expect(
-        edges.where((e) =>
-            e.sourceNode == implicitMapLiteralValueNode &&
-            e.destinationNode == returnValueNode),
-        hasLength(1));
-  }
-
-  Future test_implicitTypeArguments_setLiteral() async {
-    await analyze('''
-Set f() => {null};
-''');
-    var implicitSetLiteralElementNode =
-        implicitTypeArguments[findNode.setOrMapLiteral('{null}')]!.single.node;
-    var returnElementNode =
-        explicitTypeNullability[findNode.typeAnnotation('int')];
-    expect(
-        edges.where((e) =>
-            _isPointedToByAlways(e.sourceNode) &&
-            e.destinationNode == implicitSetLiteralElementNode),
-        hasLength(1));
-    expect(
-        edges.where((e) =>
-            e.sourceNode == implicitSetLiteralElementNode &&
-            e.destinationNode == returnElementNode),
-        hasLength(1));
-  }
-
-  Future test_implicitTypeArguments_typeAnnotation() async {
-    await analyze('''
-List f(List l) => l;
-''');
-    var implicitListElementType =
-        implicitTypeArguments[findNode.typeAnnotation('List l')]!.single.node;
-    var implicitReturnElementType =
-        explicitTypeNullability[findNode.typeAnnotation('Object')];
-    expect(
-        edges.where((e) =>
-            e.sourceNode == implicitListElementType &&
-            e.destinationNode == implicitReturnElementType),
-        hasLength(1));
-  }
-
-  Future test_substitutionNode() async {
-    await analyze('''
-class C {
-  void f(T t) {}
-}
-void g(C x, int y) {
-  x.f(y);
-}
-''');
-    var yNode = explicitTypeNullability[findNode.typeAnnotation('int y')];
-    var edge = edges.where((e) => e.sourceNode == yNode).single;
-    var sNode = edge.destinationNode as SubstitutionNodeInfo;
-    expect(sNode.innerNode,
-        explicitTypeNullability[findNode.typeAnnotation('int>')]);
-    expect(sNode.outerNode,
-        explicitTypeNullability[findNode.typeAnnotation('T t')]);
-  }
-
-  bool _isPointedToByAlways(NullabilityNodeInfo? node) {
-    return edges
-        .any((e) => e.sourceNode == always && e.destinationNode == node);
-  }
-
-  bool _pointsToNeverHard(NullabilityNodeInfo? node) {
-    return edges.any(
-        (e) => e.sourceNode == node && e.destinationNode == never && e.isHard);
-  }
-}
diff --git a/pkg/nnbd_migration/test/migration_cli_test.dart b/pkg/nnbd_migration/test/migration_cli_test.dart
deleted file mode 100644
index 4090164a61a5..000000000000
--- a/pkg/nnbd_migration/test/migration_cli_test.dart
+++ /dev/null
@@ -1,2292 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:async';
-import 'dart:convert';
-import 'dart:io';
-
-import 'package:analyzer/dart/analysis/features.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/file_system/file_system.dart' show ResourceProvider;
-import 'package:analyzer/file_system/memory_file_system.dart';
-import 'package:analyzer/file_system/physical_file_system.dart';
-import 'package:analyzer/src/dart/analysis/driver_based_analysis_context.dart';
-import 'package:analyzer/src/test_utilities/mock_sdk.dart' as mock_sdk;
-import 'package:args/args.dart';
-import 'package:cli_util/cli_logging.dart';
-import 'package:http/http.dart' as http;
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/migration_cli.dart';
-import 'package:nnbd_migration/src/front_end/dartfix_listener.dart';
-import 'package:nnbd_migration/src/front_end/instrumentation_listener.dart';
-import 'package:nnbd_migration/src/front_end/migration_summary.dart';
-import 'package:nnbd_migration/src/front_end/non_nullable_fix.dart';
-import 'package:nnbd_migration/src/front_end/web/edit_details.dart';
-import 'package:nnbd_migration/src/front_end/web/file_details.dart';
-import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart';
-import 'package:nnbd_migration/src/messages.dart' as messages;
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-import 'package:path/path.dart' as path;
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'utilities/test_logger.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(_MigrationCliTestPosix);
-    defineReflectiveTests(_MigrationCliTestWindows);
-  });
-}
-
-const sdkRootPathPosix = '/sdk';
-
-/// Specialization of [InstrumentationListener] that generates artificial
-/// exceptions, so that we can test they are properly propagated to top level.
-class _ExceptionGeneratingInstrumentationListener
-    extends InstrumentationListener {
-  _ExceptionGeneratingInstrumentationListener({super.migrationSummary});
-
-  @override
-  void externalDecoratedType(Element element, DecoratedTypeInfo decoratedType) {
-    if (element.name == 'print') {
-      throw StateError('Artificial exception triggered');
-    }
-    super.externalDecoratedType(element, decoratedType);
-  }
-}
-
-/// Specialization of [NonNullableFix] that generates artificial exceptions, so
-/// that we can test they are properly propagated to top level.
-class _ExceptionGeneratingNonNullableFix extends NonNullableFix {
-  _ExceptionGeneratingNonNullableFix(DartFixListener listener,
-      ResourceProvider resourceProvider, Object? bindAddress, Logger logger,
-      {List included = const [],
-      int? preferredPort,
-      String? summaryPath,
-      required String sdkPath})
-      : super(listener, resourceProvider, bindAddress, logger,
-            (String? path) => true,
-            included: included,
-            preferredPort: preferredPort,
-            summaryPath: summaryPath,
-            sdkPath: sdkPath);
-
-  @override
-  InstrumentationListener createInstrumentationListener(
-          {MigrationSummary? migrationSummary}) =>
-      _ExceptionGeneratingInstrumentationListener(
-          migrationSummary: migrationSummary);
-}
-
-class _MigrationCli extends MigrationCli {
-  final _MigrationCliTestBase _test;
-
-  /// If non-null, callback function that will be invoked by the `applyHook`
-  /// override.
-  void Function()? _onApplyHook;
-
-  _MigrationCli(this._test)
-      : super(
-            binaryName: 'nnbd_migration',
-            loggerFactory: (isVerbose) => _test.logger = TestLogger(isVerbose),
-            defaultSdkPathOverride:
-                _test.resourceProvider.convertPath(sdkRootPathPosix),
-            resourceProvider: _test.resourceProvider,
-            environmentVariables: _test.environmentVariables);
-
-  _MigrationCliRunner? decodeCommandLineArgs(ArgResults argResults,
-      {bool? isVerbose}) {
-    var runner = super.decodeCommandLineArgs(argResults, isVerbose: isVerbose);
-    if (runner == null) return null;
-    return _MigrationCliRunner(this, runner.options);
-  }
-}
-
-class _MigrationCliRunner extends MigrationCliRunner {
-  Future Function()? _runWhilePreviewServerActive;
-
-  _MigrationCliRunner(_MigrationCli super.cli, super.options);
-
-  _MigrationCli get cli => super.cli as _MigrationCli;
-
-  @override
-  void applyHook() {
-    super.applyHook();
-    cli._onApplyHook?.call();
-  }
-
-  @override
-  Object? computeBindAddress() {
-    var address = super.computeBindAddress();
-    if (Platform.environment.containsKey('FORCE_IPV6') &&
-        address == InternetAddress.loopbackIPv4) {
-      return InternetAddress.loopbackIPv6;
-    }
-    return address;
-  }
-
-  @override
-  Set computePathsToProcess(DriverBasedAnalysisContext context) =>
-      cli._test.overridePathsToProcess ??
-      _sortPaths(super.computePathsToProcess(context));
-
-  @override
-  NonNullableFix createNonNullableFix(DartFixListener listener,
-      ResourceProvider resourceProvider, Object? bindAddress,
-      {List included = const [],
-      int? preferredPort,
-      String? summaryPath,
-      required String sdkPath}) {
-    if (cli._test.injectArtificialException) {
-      return _ExceptionGeneratingNonNullableFix(
-          listener, resourceProvider, bindAddress, logger,
-          included: included,
-          preferredPort: preferredPort,
-          summaryPath: summaryPath,
-          sdkPath: sdkPath);
-    } else {
-      return super.createNonNullableFix(listener, resourceProvider, bindAddress,
-          included: included,
-          preferredPort: preferredPort,
-          summaryPath: summaryPath,
-          sdkPath: sdkPath);
-    }
-  }
-
-  @override
-  void listenForSignalInterrupt() {
-    if (_runWhilePreviewServerActive == null) {
-      fail('Preview server not expected to have been started');
-    }
-    sigIntSignalled = Completer();
-    _runWhilePreviewServerActive!
-        .call()
-        .then((_) => sigIntSignalled.complete());
-    _runWhilePreviewServerActive = null;
-  }
-
-  Future runWithPreviewServer(Future Function() callback) async {
-    _runWhilePreviewServerActive = callback;
-    await run();
-    if (_runWhilePreviewServerActive != null) {
-      fail('Preview server never started');
-    }
-  }
-
-  @override
-  bool shouldBeMigrated(String path) =>
-      cli._test.overrideShouldBeMigrated?.call(path) ??
-      super.shouldBeMigrated(path);
-
-  /// Sorts the paths in [paths] for repeatability of migration tests.
-  Set _sortPaths(Set paths) {
-    var pathList = paths.toList();
-    pathList.sort();
-    return pathList.toSet();
-  }
-}
-
-abstract class _MigrationCliTestBase {
-  Map environmentVariables = {};
-
-  /// If `true`, then an artificial exception should be generated when migration
-  /// encounters a reference to the `print` function.
-  bool injectArtificialException = false;
-
-  /// If non-null, this is injected as the return value for
-  /// [_MigrationCliRunner.computePathsToProcess].
-  Set? overridePathsToProcess;
-
-  bool Function(String)? overrideShouldBeMigrated;
-
-  set logger(TestLogger logger);
-
-  MemoryResourceProvider get resourceProvider;
-}
-
-mixin _MigrationCliTestMethods on _MigrationCliTestBase {
-  @override
-  late TestLogger logger;
-
-  final hasVerboseHelpMessage = contains('for verbose help output');
-
-  final hasUsageText = contains('Usage: nnbd_migration');
-
-  final urlStartRegexp = RegExp('https?:');
-
-  final dartVersionIsNullSafeByDefault =
-      Feature.non_nullable.releaseVersion != null;
-
-  String assertDecodeArgsFailure(List args) {
-    var cli = _createCli();
-    try {
-      cli.decodeCommandLineArgs(MigrationCli.createParser().parse(args));
-      fail('Migration succeeded; expected it to abort with an error');
-    } on MigrationExit catch (migrationExit) {
-      expect(migrationExit.exitCode, isNotNull);
-      expect(migrationExit.exitCode, isNot(0));
-    }
-    var stderrText = logger.stderrBuffer.toString();
-    expect(stderrText, hasUsageText);
-    expect(stderrText, hasVerboseHelpMessage);
-    return stderrText;
-  }
-
-  Future assertErrorExit(
-      MigrationCliRunner cliRunner, FutureOr Function() callback,
-      {required bool withUsage, dynamic expectedExitCode}) async {
-    expectedExitCode ??= isNot(0);
-    try {
-      await callback();
-      fail('Migration succeeded; expected it to abort with an error');
-    } on MigrationExit catch (migrationExit) {
-      expect(migrationExit.exitCode, isNotNull);
-      expect(migrationExit.exitCode, expectedExitCode);
-    }
-    expect(cliRunner.isPreviewServerRunning, isFalse);
-    return assertStderr(withUsage: withUsage);
-  }
-
-  void assertHttpSuccess(http.Response response) {
-    if (response.statusCode == 500) {
-      try {
-        var decodedResponse = jsonDecode(response.body);
-        print('Exception: ${decodedResponse['exception']}');
-        print('Stack trace:');
-        print(decodedResponse['stackTrace']);
-      } catch (_) {
-        print(response.body);
-      }
-      fail('HTTP request failed');
-    }
-    expect(response.statusCode, 200);
-  }
-
-  void assertNormalExit(MigrationCliRunner cliRunner) {
-    expect(cliRunner.isPreviewServerRunning, isFalse);
-  }
-
-  Future assertParseArgsFailure(List args) async {
-    try {
-      MigrationCli.createParser().parse(args);
-    } on FormatException catch (e) {
-      // Parsing failed, which was expected.
-      return e.message;
-    }
-    fail('Parsing was expected to fail, but did not');
-  }
-
-  CommandLineOptions assertParseArgsSuccess(List args) {
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(MigrationCli.createParser().parse(args))!;
-    assertNormalExit(cliRunner);
-    var options = cliRunner.options;
-    expect(options, isNotNull);
-    return options;
-  }
-
-  Future assertPreviewServerResponsive(String url) async {
-    var response = await httpGet(Uri.parse(url));
-    assertHttpSuccess(response);
-  }
-
-  void assertProjectContents(String projectDir, Map expected) {
-    for (var entry in expected.entries) {
-      var relativePathPosix = entry.key;
-      assert(!path.posix.isAbsolute(relativePathPosix));
-      var filePath = resourceProvider.pathContext
-          .join(projectDir, resourceProvider.convertPath(relativePathPosix));
-      expect(
-          resourceProvider.getFile(filePath).readAsStringSync(), entry.value);
-    }
-  }
-
-  Future assertRunFailure(List args,
-      {MigrationCli? cli,
-      bool withUsage = false,
-      dynamic expectedExitCode}) async {
-    expectedExitCode ??= isNot(0);
-    cli ??= _createCli();
-    MigrationCliRunner? cliRunner;
-    try {
-      cliRunner =
-          cli.decodeCommandLineArgs(MigrationCli.createParser().parse(args));
-    } on MigrationExit catch (e) {
-      expect(e.exitCode, isNotNull);
-      expect(e.exitCode, expectedExitCode);
-      return assertStderr(withUsage: withUsage);
-    }
-    return await assertErrorExit(cliRunner!, () => cliRunner!.run(),
-        withUsage: withUsage, expectedExitCode: expectedExitCode);
-  }
-
-  String assertStderr({required bool withUsage}) {
-    var stderrText = logger.stderrBuffer.toString();
-    expect(stderrText, withUsage ? hasUsageText : isNot(hasUsageText));
-    expect(stderrText,
-        withUsage ? hasVerboseHelpMessage : isNot(hasVerboseHelpMessage));
-    return stderrText;
-  }
-
-  /// Wraps a future containing an HTTP response so that when that response is
-  /// received, we will verify that it is reasonable.
-  Future checkHttpResponse(
-      Future futureResponse) async {
-    var response = await futureResponse;
-    // Check that all "http:" and "https:" URLs in the given HTTP response are
-    // absolute (guards against https://github.com/dart-lang/sdk/issues/43545).
-    for (var match in urlStartRegexp.allMatches(response.body)) {
-      expect(response.body.substring(match.end), startsWith('//'));
-    }
-    return response;
-  }
-
-  String createProjectDir(Map contents,
-      {String posixPath = '/test_project'}) {
-    for (var entry in contents.entries) {
-      var relativePathPosix = entry.key;
-      assert(!path.posix.isAbsolute(relativePathPosix));
-      var filePathPosix = path.posix.join(posixPath, relativePathPosix);
-      resourceProvider.newFile(
-          resourceProvider.convertPath(filePathPosix), entry.value!);
-    }
-    return resourceProvider.convertPath(posixPath);
-  }
-
-  Future getSourceFromServer(Uri uri, String path) async {
-    http.Response response = await tryGetSourceFromServer(uri, path);
-    assertHttpSuccess(response);
-    return jsonDecode(response.body)['sourceCode'] as String?;
-  }
-
-  /// Performs an HTTP get, verifying that the response received (if any) is
-  /// reasonable.
-  Future httpGet(Uri url, {Map? headers}) {
-    return checkHttpResponse(http.get(url, headers: headers));
-  }
-
-  /// Performs an HTTP post, verifying that the response received (if any) is
-  /// reasonable.
-  Future httpPost(Uri url,
-      {Map? headers, dynamic body, Encoding? encoding}) {
-    return checkHttpResponse(
-        http.post(url, headers: headers, body: body, encoding: encoding));
-  }
-
-  String packagePath(String path) =>
-      resourceProvider.convertPath('/.pub-cache/$path');
-
-  Future runWithPreviewServer(_MigrationCli cli, List args,
-      Future Function(String?) callback) async {
-    String? url;
-    var cliRunner = cli.decodeCommandLineArgs(_parseArgs(args));
-    if (cliRunner != null) {
-      await cliRunner.runWithPreviewServer(() async {
-        // Server should be running now
-        url = RegExp('http://.*', multiLine: true)
-            .stringMatch(logger.stdoutBuffer.toString());
-        await callback(url);
-      });
-      // Server should be stopped now
-      expect(httpGet(Uri.parse(url!)), throwsA(anything));
-      assertNormalExit(cliRunner);
-    }
-  }
-
-  void setUp() {
-    resourceProvider.newFolder(resourceProvider.pathContext.current);
-    environmentVariables.clear();
-  }
-
-  Map simpleProject(
-      {bool migrated = false,
-      String? sourceText,
-      String? pubspecText,
-      String? packageConfigText,
-      String? analysisOptionsText}) {
-    return {
-      'pubspec.yaml': pubspecText ??
-          '''
-name: test
-environment:
-  sdk: '${migrated ? '>=2.12.0 <3.0.0' : '>=2.6.0 <3.0.0'}'
-''',
-      '.dart_tool/package_config.json':
-          packageConfigText ?? _getPackageConfigText(migrated: migrated),
-      'lib/test.dart': sourceText ??
-          '''
-int${migrated ? '?' : ''} f() => null;
-''',
-      if (analysisOptionsText != null)
-        'analysis_options.yaml': analysisOptionsText,
-    };
-  }
-
-  void tearDown() {
-    NonNullableFix.shutdownAllServers();
-  }
-
-  test_default_logger() {
-    // When running normally, we don't override the logger; make sure it has a
-    // non-null default so that there won't be a crash.
-    expect(MigrationCli(binaryName: 'nnbd_migration').logger, isNotNull);
-  }
-
-  test_detect_old_sdk() async {
-    var cli = _createCli();
-    // Alter the mock SDK, changing the signature of Object.operator== to match
-    // the signature that was present prior to NNBD.  (This is what the
-    // migration tool uses to detect an old SDK).
-    var coreLib = resourceProvider.getFile(
-        resourceProvider.convertPath('$sdkRootPathPosix/lib/core/core.dart'));
-    var oldCoreLibText = coreLib.readAsStringSync();
-    var newCoreLibText = oldCoreLibText.replaceAll(
-        'external bool operator ==(Object other)',
-        'external bool operator ==(dynamic other)');
-    expect(newCoreLibText, isNot(oldCoreLibText));
-    coreLib.writeAsStringSync(newCoreLibText);
-    var projectDir = createProjectDir(simpleProject());
-    await assertRunFailure([projectDir], cli: cli);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains(messages.sdkNnbdOff));
-  }
-
-  test_detect_old_sdk_environment_variable() async {
-    environmentVariables['SDK_PATH'] = '/fake-old-sdk-path';
-    var cli = _createCli(); // Creates the mock SDK as a side effect
-    // Alter the mock SDK, changing the signature of Object.operator== to match
-    // the signature that was present prior to NNBD.  (This is what the
-    // migration tool uses to detect an old SDK).
-    var coreLib = resourceProvider.getFile(
-        resourceProvider.convertPath('$sdkRootPathPosix/lib/core/core.dart'));
-    var oldCoreLibText = coreLib.readAsStringSync();
-    var newCoreLibText = oldCoreLibText.replaceAll(
-        'external bool operator ==(Object other)',
-        'external bool operator ==(dynamic other)');
-    expect(newCoreLibText, isNot(oldCoreLibText));
-    coreLib.writeAsStringSync(newCoreLibText);
-    var projectDir = createProjectDir(simpleProject());
-    await assertRunFailure([projectDir], cli: cli);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains(messages.sdkNnbdOff));
-    expect(output, contains(messages.sdkPathEnvironmentVariableSet));
-    expect(output, contains(environmentVariables['SDK_PATH']));
-  }
-
-  test_flag_apply_changes_default() {
-    expect(assertParseArgsSuccess([]).applyChanges, isFalse);
-    expect(assertParseArgsSuccess([]).webPreview, isTrue);
-  }
-
-  test_flag_apply_changes_disable() async {
-    // "--no-apply-changes" is not an option.
-    await assertParseArgsFailure(['--no-apply-changes']);
-  }
-
-  test_flag_apply_changes_enable() {
-    var options = assertParseArgsSuccess(['--apply-changes']);
-    expect(options.applyChanges, isTrue);
-    expect(options.webPreview, isFalse);
-  }
-
-  test_flag_apply_changes_enable_with_no_web_preview() {
-    expect(
-        assertParseArgsSuccess(['--no-web-preview', '--apply-changes'])
-            .applyChanges,
-        isTrue);
-  }
-
-  test_flag_apply_changes_incompatible_with_web_preview() {
-    expect(assertDecodeArgsFailure(['--web-preview', '--apply-changes']),
-        contains('--apply-changes requires --no-web-preview'));
-  }
-
-  test_flag_help() {
-    var helpText = _getHelpText(verbose: false);
-    expect(helpText, hasUsageText);
-    expect(helpText, hasVerboseHelpMessage);
-  }
-
-  test_flag_help_verbose() {
-    var helpText = _getHelpText(verbose: true);
-    expect(helpText, hasUsageText);
-    expect(helpText, isNot(hasVerboseHelpMessage));
-  }
-
-  test_flag_ignore_errors_default() {
-    expect(assertParseArgsSuccess([]).ignoreErrors, isFalse);
-  }
-
-  test_flag_ignore_errors_disable() async {
-    await assertParseArgsFailure(['--no-ignore-errors']);
-  }
-
-  test_flag_ignore_errors_enable() {
-    expect(assertParseArgsSuccess(['--ignore-errors']).ignoreErrors, isTrue);
-  }
-
-  test_flag_ignore_exceptions_default() {
-    expect(assertParseArgsSuccess([]).ignoreExceptions, isFalse);
-  }
-
-  test_flag_ignore_exceptions_disable() async {
-    await assertParseArgsFailure(['--no-ignore-exceptions']);
-  }
-
-  test_flag_ignore_exceptions_enable() {
-    expect(assertParseArgsSuccess(['--ignore-exceptions']).ignoreExceptions,
-        isTrue);
-  }
-
-  test_flag_ignore_exceptions_hidden() {
-    var flagName = '--ignore-exceptions';
-    expect(_getHelpText(verbose: false), isNot(contains(flagName)));
-    expect(_getHelpText(verbose: true), contains(flagName));
-  }
-
-  test_flag_skip_import_check_default() {
-    expect(assertParseArgsSuccess([]).skipImportCheck, isFalse);
-  }
-
-  test_flag_skip_import_check_disable() async {
-    // "--no-skip-import-check" is not an option.
-    await assertParseArgsFailure(['--no-skip-import_check']);
-  }
-
-  test_flag_skip_import_check_enable() {
-    expect(assertParseArgsSuccess(['--skip-import-check']).skipImportCheck,
-        isTrue);
-  }
-
-  test_flag_web_preview_default() {
-    expect(assertParseArgsSuccess([]).webPreview, isTrue);
-  }
-
-  test_flag_web_preview_disable() {
-    expect(assertParseArgsSuccess(['--no-web-preview']).webPreview, isFalse);
-  }
-
-  test_flag_web_preview_enable() {
-    expect(assertParseArgsSuccess(['--web-preview']).webPreview, isTrue);
-  }
-
-  test_lifecycle_already_migrated_file() async {
-    Map createProject({bool migrated = false}) {
-      var projectContents = simpleProject(sourceText: '''
-${migrated ? '''
-// ignore: illegal_language_version_override
-''' : '''
-// ignore: illegal_language_version_override
-// @dart = 2.6'''}
-import 'already_migrated.dart';
-int${migrated ? '?' : ''} x = y;
-''', migrated: true);
-      projectContents['lib/already_migrated.dart'] = '''
-int? y = 0;
-''';
-      return projectContents;
-    }
-
-    var projectContents = createProject();
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    assertNormalExit(cliRunner);
-    // Check that a summary was printed
-    expect(logger.stdoutBuffer.toString(), contains('Applying changes'));
-    // And that it refers to test.dart, but not pubspec.yaml or
-    // already_migrated.dart.
-    expect(logger.stdoutBuffer.toString(), contains('test.dart'));
-    expect(logger.stdoutBuffer.toString(), isNot(contains('pubspec.yaml')));
-    expect(logger.stdoutBuffer.toString(),
-        isNot(contains('already_migrated.dart')));
-    // And that it does not tell the user they can rerun with `--apply-changes`
-    expect(logger.stdoutBuffer.toString(), isNot(contains('--apply-changes')));
-    // Check that the non-migrated library was changed but not the migrated one
-    assertProjectContents(projectDir, createProject(migrated: true));
-  }
-
-  test_lifecycle_apply_changes() async {
-    var projectContents = simpleProject();
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    var cliRunner =
-        cli.decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    bool applyHookCalled = false;
-    cli._onApplyHook = () {
-      expect(applyHookCalled, false);
-      applyHookCalled = true;
-      // Changes should have been made
-      assertProjectContents(projectDir, simpleProject(migrated: true));
-    };
-    await cliRunner.run();
-    assertNormalExit(cliRunner);
-    expect(applyHookCalled, true);
-    // Check that a summary was printed
-    expect(logger.stdoutBuffer.toString(), contains('Applying changes'));
-    // And that it refers to test.dart and pubspec.yaml
-    expect(logger.stdoutBuffer.toString(), contains('test.dart'));
-    expect(logger.stdoutBuffer.toString(), contains('pubspec.yaml'));
-    // And that it does not tell the user they can rerun with `--apply-changes`
-    expect(logger.stdoutBuffer.toString(), isNot(contains('--apply-changes')));
-  }
-
-  test_lifecycle_contextdiscovery_handles_multiple() async {
-    var projectContents = simpleProject();
-    var subProject = simpleProject();
-    for (var filePath in subProject.keys) {
-      projectContents['example/$filePath'] = subProject[filePath];
-    }
-    projectContents['example/analysis_options.yaml'] = '''
-linter:
-  rules:
-    - empty_constructor_bodies
-''';
-
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--no-web-preview', projectDir]))!;
-    await cliRunner.run();
-    assertNormalExit(cliRunner);
-    expect(cliRunner.hasMultipleAnalysisContext, true);
-    expect(cliRunner.analysisContext, isNotNull);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains('more than one project found'));
-  }
-
-  test_lifecycle_contextdiscovery_handles_single() async {
-    var projectContents = simpleProject();
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--no-web-preview', projectDir]))!;
-    await cliRunner.run();
-    assertNormalExit(cliRunner);
-    expect(cliRunner.hasMultipleAnalysisContext, false);
-    expect(cliRunner.analysisContext, isNotNull);
-  }
-
-  test_lifecycle_exception_handling() async {
-    var projectContents = simpleProject(sourceText: 'main() { print(0); }');
-    var projectDir = createProjectDir(projectContents);
-    injectArtificialException = true;
-    await assertRunFailure([projectDir]);
-    var errorOutput = logger.stderrBuffer.toString();
-    expect(errorOutput, contains('Artificial exception triggered'));
-    expect(
-        errorOutput, isNot(contains('try to fix errors in the source code')));
-    expect(errorOutput, contains('re-run with\n--ignore-exceptions'));
-    expect(errorOutput, contains('consider filing a bug report'));
-    expect(
-        errorOutput,
-        contains(
-            RegExp(r'Please include the SDK version \([0-9]+\.[0-9]+\..*\)')));
-  }
-
-  test_lifecycle_exception_handling_ignore() async {
-    var projectContents = simpleProject(sourceText: '''
-main() {
-  print(0);
-  int x = null;
-}
-''');
-    var projectDir = createProjectDir(projectContents);
-    injectArtificialException = true;
-    var cli = _createCli();
-    await runWithPreviewServer(cli, ['--ignore-exceptions', projectDir],
-        (url) async {
-      var output = logger.stdoutBuffer.toString();
-      expect(output, contains('No analysis issues found'));
-      expect(output, isNot(contains('Artificial exception triggered')));
-      expect(
-          output,
-          contains('Attempting to perform\nmigration anyway due to the use'
-              ' of --ignore-exceptions.'));
-      expect(output, contains('re-run without --ignore-exceptions'));
-      await assertPreviewServerResponsive(url!);
-      await _tellPreviewToApplyChanges(url);
-      assertProjectContents(
-          projectDir, simpleProject(migrated: true, sourceText: '''
-main() {
-  print(0);
-  int? x = null;
-}
-'''));
-    });
-    expect(logger.stderrBuffer.toString(), isEmpty);
-  }
-
-  test_lifecycle_exception_handling_multiple() async {
-    var projectContents =
-        simpleProject(sourceText: 'main() { print(0); print(1); }');
-    var projectDir = createProjectDir(projectContents);
-    injectArtificialException = true;
-    await assertRunFailure([projectDir]);
-    var errorOutput = logger.stderrBuffer.toString();
-    expect(
-        'Artificial exception triggered'.allMatches(errorOutput), hasLength(1));
-    expect(
-        errorOutput, isNot(contains('try to fix errors in the source code')));
-    expect(errorOutput, contains('re-run with\n--ignore-exceptions'));
-  }
-
-  test_lifecycle_exception_handling_with_error() async {
-    var projectContents =
-        simpleProject(sourceText: 'main() { print(0); unresolved; }');
-    var projectDir = createProjectDir(projectContents);
-    injectArtificialException = true;
-    await assertRunFailure(['--ignore-errors', projectDir]);
-    var errorOutput = logger.stderrBuffer.toString();
-    expect(errorOutput, contains('Artificial exception triggered'));
-    expect(errorOutput, contains('try to fix errors in the source code'));
-    expect(errorOutput, contains('re-run with\n--ignore-exceptions'));
-  }
-
-  test_lifecycle_ignore_errors_disable() async {
-    var projectContents = simpleProject(sourceText: '''
-int f() => null
-''');
-    var projectDir = createProjectDir(projectContents);
-    await assertRunFailure([projectDir]);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains('1 analysis issue found'));
-    var sep = resourceProvider.pathContext.separator;
-    expect(
-        output,
-        contains("error • Expected to find ';' at lib${sep}test.dart:1:12 • "
-            '(expected_token)'));
-    expect(output, contains('erroneous migration suggestions'));
-    expect(output, contains('We recommend fixing the analysis issues'));
-    expect(output, isNot(contains('Set the lower SDK constraint')));
-  }
-
-  test_lifecycle_ignore_errors_enable() async {
-    var projectContents = simpleProject(sourceText: '''
-int? f() => null
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, ['--ignore-errors', projectDir],
-        (url) async {
-      var output = logger.stdoutBuffer.toString();
-      expect(output, isNot(contains('No analysis issues found')));
-      expect(
-          output,
-          contains('Continuing with migration suggestions due to the use of '
-              '--ignore-errors.'));
-      await assertPreviewServerResponsive(url!);
-    });
-  }
-
-  test_lifecycle_import_check_handle_improper_lib_import() async {
-    Map computeProjectContents({required bool migrated}) => {
-          'pubspec.yaml': '''
-name: test
-environment:
-  sdk: '${migrated ? '>=2.12.0 <3.0.0' : '>=2.6.0 <3.0.0'}'
-''',
-          '.dart_tool/package_config.json':
-              _getPackageConfigText(migrated: migrated),
-          'lib/foo.dart': '''
-int${migrated ? '?' : ''} f() => null;
-''',
-          'test/foo_test.dart': '''
-import '../lib/foo.dart';
-int${migrated ? '?' : ''} g() => f();
-''',
-        };
-    var projectContents = computeProjectContents(migrated: false);
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    bool applyHookCalled = false;
-    cli._onApplyHook = () {
-      expect(applyHookCalled, false);
-      applyHookCalled = true;
-      // Changes should have been made
-      assertProjectContents(projectDir, computeProjectContents(migrated: true));
-    };
-    await runWithPreviewServer(cli, ['--skip-import-check', projectDir],
-        (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      await _tellPreviewToApplyChanges(url);
-      expect(applyHookCalled, true);
-      var output = logger.stdoutBuffer.toString();
-      expect(output,
-          isNot(contains('Warning: package has unmigrated dependencies')));
-      // Output should not mention that the user can rerun without
-      // `--skip-import-check`.
-      expect(output,
-          isNot(contains('`--${CommandLineOptions.skipImportCheckFlag}`')));
-    });
-  }
-
-  test_lifecycle_import_check_via_export() async {
-    // If the user's code exports a library that imports a non-migrated library,
-    // that's a problem too.
-    var projectContents = simpleProject(
-        sourceText: "export 'package:foo/foo.dart';",
-        packageConfigText: _getPackageConfigText(
-            migrated: false, packagesMigrated: {'foo': true, 'bar': false}));
-    var projectDir = createProjectDir(projectContents);
-    resourceProvider.newFile(
-        packagePath('foo/lib/foo.dart'), "import 'package:bar/bar.dart';");
-    resourceProvider.newFile(packagePath('bar/lib/bar.dart'), '');
-    await assertRunFailure([projectDir], expectedExitCode: 1);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains('Error: package has unmigrated dependencies'));
-    // Output should mention bar.dart, since it's unmigrated
-    expect(output, contains('package:bar/bar.dart'));
-    // But it should not mention foo.dart, which is migrated
-    expect(output, isNot(contains('package:foo/foo.dart')));
-  }
-
-  test_lifecycle_import_check_via_indirect_export() async {
-    // If the user's code imports a library that exports a library that imports
-    // a non-migrated library, that's a problem too.
-    var projectContents = simpleProject(
-        sourceText: "import 'package:foo/foo.dart';",
-        packageConfigText: _getPackageConfigText(
-            migrated: false,
-            packagesMigrated: {'foo': true, 'bar': true, 'baz': false}));
-    var projectDir = createProjectDir(projectContents);
-    resourceProvider.newFile(
-        packagePath('foo/lib/foo.dart'), "export 'package:bar/bar.dart';");
-    resourceProvider.newFile(
-        packagePath('bar/lib/bar.dart'), "import 'package:baz/baz.dart';");
-    resourceProvider.newFile(packagePath('baz/lib/baz.dart'), '');
-    await assertRunFailure([projectDir], expectedExitCode: 1);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains('Error: package has unmigrated dependencies'));
-    // Output should mention baz.dart, since it's unmigrated
-    expect(output, contains('package:baz/baz.dart'));
-    // But it should not mention foo.dart or bar.dart, which are migrated
-    expect(output, isNot(contains('package:foo/foo.dart')));
-    expect(output, isNot(contains('package:bar/bar.dart')));
-  }
-
-  test_lifecycle_import_lib_from_test() async {
-    Map makeProject({bool migrated = false}) {
-      return simpleProject(migrated: migrated)
-        ..['test/foo.dart'] = '''
-import '../lib/test.dart';
-''';
-    }
-
-    var projectContents = makeProject();
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    var cliRunner =
-        cli.decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    bool applyHookCalled = false;
-    cli._onApplyHook = () {
-      expect(applyHookCalled, false);
-      applyHookCalled = true;
-      // Changes should have been made
-      assertProjectContents(projectDir, makeProject(migrated: true));
-    };
-    await cliRunner.run();
-    assertNormalExit(cliRunner);
-    expect(applyHookCalled, true);
-  }
-
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/44118')
-  test_lifecycle_issue_44118() async {
-    var projectContents = simpleProject(sourceText: '''
-int f() => null
-''');
-    projectContents['lib/foo.dart'] = '''
-import 'test.dart';
-''';
-    var projectDir = createProjectDir(projectContents);
-    await assertRunFailure([projectDir]);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains('1 analysis issue found'));
-    var sep = resourceProvider.pathContext.separator;
-    expect(
-        output,
-        contains("error • Expected to find ';' at lib${sep}test.dart:1:12 • "
-            '(expected_token)'));
-    expect(
-        output,
-        contains(
-            'analysis errors will result in erroneous migration suggestions'));
-    expect(output, contains('Please fix the analysis issues'));
-  }
-
-  test_lifecycle_migration_already_performed() async {
-    var projectContents = simpleProject(migrated: true);
-    var projectDir = createProjectDir(projectContents);
-    await assertRunFailure([projectDir], expectedExitCode: 0);
-    var output = logger.stdoutBuffer.toString();
-    expect(output,
-        contains('All sources appear to be already migrated.  Nothing to do.'));
-  }
-
-  test_lifecycle_no_preview() async {
-    var projectContents = simpleProject();
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--no-web-preview', projectDir]))!;
-    await cliRunner.run();
-    assertNormalExit(cliRunner);
-    // Check that a summary was printed
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains('Diff of changes'));
-    // And that it refers to test.dart and pubspec.yaml
-    expect(output, contains('test.dart'));
-    expect(output, contains('pubspec.yaml'));
-    // And that it contains text from a changed line
-    expect(output, contains('f() => null'));
-    // And that it tells the user they can rerun with `--apply-changes`
-    expect(output, contains('--apply-changes'));
-    // No changes should have been made
-    assertProjectContents(projectDir, projectContents);
-  }
-
-  test_lifecycle_override_paths() async {
-    Map makeProject({bool migrated = false}) {
-      var projectContents = simpleProject(migrated: migrated);
-      projectContents['lib/test.dart'] = '''
-import 'skip.dart';
-import 'analyze_but_do_not_migrate.dart';
-int f() => 1;
-int${migrated ? '?' : ''} g() => 1;
-int${migrated ? '?' : ''} h() => 1;
-bool call_h() => h() == null;
-''';
-      projectContents['lib/skip.dart'] = '''
-import 'test.dart';
-bool call_f() => f() == null;
-''';
-      projectContents['lib/analyze_but_do_not_migrate.dart'] = '''
-import 'test.dart';
-bool call_g() => g() == null;
-''';
-      return projectContents;
-    }
-
-    var projectContents = makeProject();
-    var projectDir = createProjectDir(projectContents);
-    var testPath =
-        resourceProvider.pathContext.join(projectDir, 'lib', 'test.dart');
-    var analyzeButDoNotMigratePath = resourceProvider.pathContext
-        .join(projectDir, 'lib', 'analyze_but_do_not_migrate.dart');
-    overridePathsToProcess = {testPath, analyzeButDoNotMigratePath};
-    overrideShouldBeMigrated = (path) => path == testPath;
-    var cliRunner = _createCli().decodeCommandLineArgs(_parseArgs([
-      '--no-web-preview',
-      '--apply-changes',
-      '--skip-import-check',
-      projectDir
-    ]))!;
-    await cliRunner.run();
-    assertNormalExit(cliRunner);
-    // Check that a summary was printed
-    expect(logger.stdoutBuffer.toString(), contains('Applying changes'));
-    // And that it refers to test.dart and pubspec.yaml
-    expect(logger.stdoutBuffer.toString(), contains('test.dart'));
-    expect(logger.stdoutBuffer.toString(), contains('pubspec.yaml'));
-    // And that it does not tell the user they can rerun with `--apply-changes`
-    expect(logger.stdoutBuffer.toString(), isNot(contains('--apply-changes')));
-    // Changes should have been made only to test.dart, and only accounting for
-    // the calls coming from analyze_but_do_not_migrate.dart and test.dart
-    assertProjectContents(projectDir, makeProject(migrated: true));
-  }
-
-  test_lifecycle_preview() async {
-    var projectContents = simpleProject();
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      var localhostAddressText = Platform.environment.containsKey('FORCE_IPV6')
-          ? '[::1]'
-          : '127.0.0.1';
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      expect(url, startsWith('http://$localhostAddressText:'));
-      await assertPreviewServerResponsive(url!);
-    });
-    // No changes should have been made.
-    assertProjectContents(projectDir, projectContents);
-  }
-
-  test_lifecycle_preview_add_hint() async {
-    var projectContents = simpleProject(sourceText: 'int x;');
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var authToken = uri.queryParameters['authToken'];
-      var response = await httpPost(
-          uri.replace(
-              path: resourceProvider.pathContext
-                  .toUri(resourceProvider.pathContext
-                      .join(projectDir, 'lib', 'test.dart'))
-                  .path,
-              queryParameters: {
-                'offset': '3',
-                'end': '3',
-                'replacement': '/*!*/',
-                'authToken': authToken
-              }),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(response);
-      assertProjectContents(
-          projectDir, simpleProject(sourceText: 'int/*!*/ x;'));
-    });
-  }
-
-  test_lifecycle_preview_apply_changes() async {
-    var projectContents = simpleProject();
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    bool applyHookCalled = false;
-    cli._onApplyHook = () {
-      expect(applyHookCalled, false);
-      applyHookCalled = true;
-      // Changes should have been made
-      assertProjectContents(projectDir, simpleProject(migrated: true));
-    };
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      await _tellPreviewToApplyChanges(url);
-      expect(applyHookCalled, true);
-    });
-  }
-
-  test_lifecycle_preview_apply_changes_unreferenced_part() async {
-    var projectContents = simpleProject()
-      ..['lib/unreferenced_part.dart'] = '''
-part of foo;
-
-int f() => null;
-''';
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    bool applyHookCalled = false;
-    cli._onApplyHook = () {
-      expect(applyHookCalled, false);
-      applyHookCalled = true;
-      // Changes should have been made
-      assertProjectContents(projectDir, simpleProject(migrated: true));
-    };
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      await _tellPreviewToApplyChanges(url);
-      expect(applyHookCalled, true);
-    });
-  }
-
-  test_lifecycle_preview_extra_forward_slash() async {
-    var projectDir = createProjectDir(simpleProject());
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      var uri = Uri.parse(url!);
-      await assertPreviewServerResponsive(
-          uri.replace(path: '${uri.path}/').toString());
-    });
-  }
-
-  test_lifecycle_preview_navigation_links() async {
-    var projectContents = simpleProject(sourceText: 'int x;');
-    projectContents['lib/src/test.dart'] = 'import "../test.dart"; int y = x;';
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      final uri = Uri.parse(url);
-      final authToken = uri.queryParameters['authToken'];
-      final fileResponse = await httpGet(
-          uri.replace(
-              path: resourceProvider.pathContext
-                  .toUri(resourceProvider.pathContext
-                      .join(projectDir, 'lib', 'src', 'test.dart'))
-                  .path,
-              queryParameters: {'inline': 'true', 'authToken': authToken}),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      final fileJson = FileDetails.fromJson(jsonDecode(fileResponse.body));
-      final navigation = fileJson.navigationContent!;
-      final aLink = RegExp(r'');
-      for (final match in aLink.allMatches(navigation)) {
-        var href = match.group(1)!;
-        final contentsResponse = await httpGet(
-            uri.replace(
-                path: Uri.parse(href).path,
-                queryParameters: {'inline': 'true', 'authToken': authToken}),
-            headers: {'Content-Type': 'application/json; charset=UTF-8'});
-        assertHttpSuccess(contentsResponse);
-      }
-    });
-  }
-
-  test_lifecycle_preview_navigation_tree() async {
-    var projectContents = simpleProject(sourceText: 'int x;');
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var authToken = uri.queryParameters['authToken'];
-      var treeResponse = await httpGet(
-          uri.replace(
-              path: '/_preview/navigationTree.json',
-              queryParameters: {'authToken': authToken}),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      var navRoots = jsonDecode(treeResponse.body) as List;
-      for (final root in navRoots) {
-        var navTree =
-            NavigationTreeNode.fromJson(root) as NavigationTreeDirectoryNode;
-        for (final file in navTree.subtree!) {
-          if (file is NavigationTreeFileNode) {
-            final contentsResponse = await httpGet(
-                uri
-                    .resolve(file.href!)
-                    .replace(queryParameters: {'authToken': authToken}),
-                headers: {'Content-Type': 'application/json; charset=UTF-8'});
-            assertHttpSuccess(contentsResponse);
-          }
-        }
-      }
-    });
-  }
-
-  test_lifecycle_preview_on_host_any() async {
-    var projectContents = simpleProject();
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli()
-      ..decodeCommandLineArgs(_parseArgs(['--preview-hostname=any']));
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(url, isNot(contains('localhost')));
-      await assertPreviewServerResponsive(url!);
-    });
-    // No changes should have been made.
-    assertProjectContents(projectDir, projectContents);
-  }
-
-  test_lifecycle_preview_region_link() async {
-    var projectContents = simpleProject(sourceText: 'int x;');
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var authToken = uri.queryParameters['authToken'];
-      var regionResponse = await httpGet(
-          uri.replace(
-              path: resourceProvider.pathContext
-                  .toUri(resourceProvider.pathContext
-                      .join(projectDir, 'lib', 'test.dart'))
-                  .path,
-              queryParameters: {
-                'region': 'region',
-                'offset': '3',
-                'authToken': authToken
-              }),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      var regionJson = EditDetails.fromJson(jsonDecode(regionResponse.body));
-      final displayPath = regionJson.displayPath!;
-      final uriPath = regionJson.uriPath;
-      // uriPath should be a working URI
-      final contentsResponse = await httpGet(
-          uri.replace(
-              path: uriPath,
-              queryParameters: {'inline': 'true', 'authToken': authToken}),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(contentsResponse);
-
-      // Display path should be the actual windows path
-      final file = resourceProvider
-          .getFolder(projectDir)
-          .getChildAssumingFile(displayPath);
-      expect(file.exists, isTrue);
-    });
-  }
-
-  test_lifecycle_preview_region_table_path() async {
-    var projectContents = simpleProject(sourceText: 'int x;');
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      final uri = Uri.parse(url);
-      final authToken = uri.queryParameters['authToken'];
-      final fileResponse = await httpGet(
-          uri.replace(
-              path: resourceProvider.pathContext
-                  .toUri(resourceProvider.pathContext
-                      .join(projectDir, 'lib', 'test.dart'))
-                  .path,
-              queryParameters: {'inline': 'true', 'authToken': authToken}),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      final fileJson = FileDetails.fromJson(jsonDecode(fileResponse.body));
-      final regions = fileJson.regions!;
-      final regionsPathRegex = RegExp(r'');
-      expect(regionsPathRegex.hasMatch(regions), true);
-      final regionsPath = regionsPathRegex.matchAsPrefix(regions)!.group(1)!;
-      final contentsResponse = await httpGet(
-          uri.replace(
-              path: Uri.parse(regionsPath).path,
-              queryParameters: {'inline': 'true', 'authToken': authToken}),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(contentsResponse);
-    });
-  }
-
-  test_lifecycle_preview_rerun() async {
-    var origSourceText = 'void f() {}';
-    var projectContents = simpleProject(sourceText: origSourceText);
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var testPath =
-          resourceProvider.pathContext.join(projectDir, 'lib', 'test.dart');
-      var newSourceText = 'void g() {}';
-      resourceProvider.getFile(testPath).writeAsStringSync(newSourceText);
-      // We haven't rerun, so getting the file details from the server should
-      // still yield the original source text
-      expect(await getSourceFromServer(uri, testPath), origSourceText);
-      var response = await httpPost(uri.replace(path: 'rerun-migration'),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(response);
-      // Now that we've rerun, the server should yield the new source text
-      expect(await getSourceFromServer(uri, testPath), newSourceText);
-    });
-  }
-
-  test_lifecycle_preview_rerun_added_file() async {
-    var projectContents = simpleProject();
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var test2Path =
-          resourceProvider.pathContext.join(projectDir, 'lib', 'test2.dart');
-      var newSourceText = 'void g() {}';
-      resourceProvider.getFile(test2Path).writeAsStringSync(newSourceText);
-      // We haven't rerun, so getting the file details from the server should
-      // fail
-      var response = await tryGetSourceFromServer(uri, test2Path);
-      expect(response.statusCode, 404);
-      response = await httpPost(uri.replace(path: 'rerun-migration'),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(response);
-      // Now that we've rerun, the server should yield the new source text
-      expect(await getSourceFromServer(uri, test2Path), newSourceText);
-    });
-  }
-
-  test_lifecycle_preview_rerun_deleted_file() async {
-    var projectContents = {...simpleProject(), 'lib/other.dart': ''};
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    // Note: we use the summary to verify that the deletion was noticed
-    var summaryPath = resourceProvider.convertPath('/summary.json');
-    await runWithPreviewServer(cli, ['--summary', summaryPath, projectDir],
-        (url) async {
-      await assertPreviewServerResponsive(url!);
-      // lib/test.dart should be readable from the server and appear in the
-      // summary
-      var uri = Uri.parse(url);
-      var testPath =
-          resourceProvider.pathContext.join(projectDir, 'lib', 'test.dart');
-      await getSourceFromServer(uri, testPath);
-      var summaryData =
-          jsonDecode(resourceProvider.getFile(summaryPath).readAsStringSync());
-      var separator = resourceProvider.pathContext.separator;
-      expect(summaryData['changes']['byPath'],
-          contains('lib${separator}test.dart'));
-      // Now delete the lib file and rerun
-      resourceProvider.deleteFile(testPath);
-      var response = await httpPost(uri.replace(path: 'rerun-migration'),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(response);
-      // lib/test.dart should no longer be readable from the server and
-      // should no longer appear in the summary
-      response = await tryGetSourceFromServer(uri, testPath);
-      expect(response.statusCode, 404);
-      summaryData =
-          jsonDecode(resourceProvider.getFile(summaryPath).readAsStringSync());
-      expect(summaryData['changes']['byPath'],
-          isNot(contains('lib${separator}test.dart')));
-    });
-  }
-
-  test_lifecycle_preview_rerun_with_ignore_errors() async {
-    var origSourceText = 'void _f(int i) {}';
-    var projectContents = simpleProject(sourceText: origSourceText);
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, ['--ignore-errors', projectDir],
-        (url) async {
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var testPath =
-          resourceProvider.pathContext.join(projectDir, 'lib', 'test.dart');
-      resourceProvider
-          .getFile(testPath)
-          .writeAsStringSync('void _f(int? i) {}');
-      // We haven't rerun, so getting the file details from the server should
-      // still yield the original source text, with informational space.
-      expect(await getSourceFromServer(uri, testPath), 'void _f(int  i) {}');
-      var response = await httpPost(uri.replace(path: 'rerun-migration'),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(response);
-      var body = jsonDecode(response.body);
-      expect(body['success'], isTrue);
-      expect(body['errors'], isNull);
-      // Now that we've rerun, the server should yield the new source text
-      expect(await getSourceFromServer(uri, testPath), 'void _f(int?  i) {}');
-    });
-  }
-
-  test_lifecycle_preview_rerun_with_new_analysis_errors() async {
-    var origSourceText = 'void _f(int i) {}';
-    var projectContents = simpleProject(sourceText: origSourceText);
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var testPath =
-          resourceProvider.pathContext.join(projectDir, 'lib', 'test.dart');
-      var newSourceText = 'void _f(int? i) {}';
-      resourceProvider.getFile(testPath).writeAsStringSync(newSourceText);
-      // We haven't rerun, so getting the file details from the server should
-      // still yield the original source text, with informational space.
-      expect(await getSourceFromServer(uri, testPath), 'void _f(int  i) {}');
-      var response = await httpPost(uri.replace(path: 'rerun-migration'),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(response);
-      var body = jsonDecode(response.body);
-      expect(body['success'], isFalse);
-      expect(body['errors'], hasLength(1));
-      var error = body['errors'].single;
-      expect(error['severity'], equals('error'));
-      expect(
-          error['message'],
-          equals(
-              "This requires the 'non-nullable' language feature to be enabled"));
-      expect(error['location'],
-          equals(resourceProvider.pathContext.join('lib', 'test.dart:1:12')));
-      expect(error['code'], equals('experiment_not_enabled'));
-    });
-  }
-
-  test_lifecycle_preview_serves_only_from_project_dir() async {
-    var crazyFunctionName = 'crazyFunctionNameThatHasNeverBeenSeenBefore';
-    var projectContents =
-        simpleProject(sourceText: 'void $crazyFunctionName() {}');
-    var mainProjectDir = createProjectDir(projectContents);
-    var otherProjectDir =
-        createProjectDir(projectContents, posixPath: '/other_project_dir');
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [mainProjectDir], (url) async {
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-
-      Future tryGetSourceFromProject(String projectDir) =>
-          tryGetSourceFromServer(
-              uri,
-              resourceProvider.pathContext
-                  .join(projectDir, 'lib', 'test.dart'));
-
-      // To verify that we're forming the request correctly, make sure that we
-      // can read a file from mainProjectDir.
-      var response = await tryGetSourceFromProject(mainProjectDir);
-      assertHttpSuccess(response);
-      // And that crazyFunctionName appears in the response
-      expect(response.body, contains(crazyFunctionName));
-      // Now verify that making the exact same request from otherProjectDir
-      // fails.
-      response = await tryGetSourceFromProject(otherProjectDir);
-      expect(response.statusCode, 404);
-      // And check that we didn't leak any info through the 404 response.
-      expect(response.body, isNot(contains(crazyFunctionName)));
-    });
-  }
-
-  test_lifecycle_preview_stack_hint_action() async {
-    var projectContents = simpleProject(sourceText: 'int x;');
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var authToken = uri.queryParameters['authToken'];
-      var regionResponse = await httpGet(
-          uri.replace(
-              path: resourceProvider.pathContext
-                  .toUri(resourceProvider.pathContext
-                      .join(projectDir, 'lib', 'test.dart'))
-                  .path,
-              queryParameters: {
-                'region': 'region',
-                'offset': '3',
-                'authToken': authToken
-              }),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      var regionJson = jsonDecode(regionResponse.body);
-      var response = await httpPost(
-          uri.replace(
-              path: 'apply-hint', queryParameters: {'authToken': authToken}),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'},
-          body: jsonEncode(
-              regionJson['traces'][0]['entries'][0]['hintActions'][0]));
-      assertHttpSuccess(response);
-      assertProjectContents(
-          projectDir, simpleProject(sourceText: 'int/*?*/ x;'));
-    });
-  }
-
-  test_lifecycle_preview_stacktrace_link() async {
-    var projectContents = simpleProject(sourceText: 'int x;');
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    await runWithPreviewServer(cli, [projectDir], (url) async {
-      expect(
-          logger.stdoutBuffer.toString(), contains('No analysis issues found'));
-      await assertPreviewServerResponsive(url!);
-      var uri = Uri.parse(url);
-      var authToken = uri.queryParameters['authToken'];
-      var regionUri = uri.replace(
-          path: resourceProvider.pathContext
-              .toUri(resourceProvider.pathContext
-                  .join(projectDir, 'lib', 'test.dart'))
-              .path,
-          queryParameters: {
-            'region': 'region',
-            'offset': '3',
-            'authToken': authToken
-          });
-      var regionResponse = await httpGet(regionUri,
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      var regionJson = EditDetails.fromJson(jsonDecode(regionResponse.body));
-      final traceEntry = regionJson.traces![0].entries[0];
-      final uriPath = traceEntry.link!.href!;
-      // uriPath should be a working URI
-      final contentsResponse = await httpGet(
-          regionUri
-              .resolve(uriPath)
-              .replace(queryParameters: {'authToken': authToken}),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(contentsResponse);
-    });
-  }
-
-  test_lifecycle_skip_import_check_disable() async {
-    var projectContents = simpleProject(
-        sourceText: '''
-import 'package:foo/foo.dart';
-import 'package:foo/bar.dart';
-
-int f() => null;
-''',
-        packageConfigText: _getPackageConfigText(
-            migrated: false, packagesMigrated: {'foo': false}));
-    var projectDir = createProjectDir(projectContents);
-    resourceProvider.newFile(packagePath('foo/lib/foo.dart'), '');
-    resourceProvider.newFile(packagePath('foo/lib/bar.dart'), '');
-    await assertRunFailure([projectDir], expectedExitCode: 1);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains('Error: package has unmigrated dependencies'));
-    // Output should contain an indented, sorted list of all unmigrated
-    // dependencies.
-    expect(
-        output, contains('\n  package:foo/bar.dart\n  package:foo/foo.dart'));
-    // Output should mention that the user can rerun with `--skip-import-check`.
-    expect(output, contains('`--${CommandLineOptions.skipImportCheckFlag}`'));
-  }
-
-  test_lifecycle_skip_import_check_enable() async {
-    var projectContents = simpleProject(
-        sourceText: '''
-import 'package:foo/foo.dart';
-import 'package:foo/bar.dart';
-
-int f() => null;
-''',
-        packageConfigText: _getPackageConfigText(
-            migrated: false, packagesMigrated: {'foo': false}));
-    var projectDir = createProjectDir(projectContents);
-    resourceProvider.newFile(packagePath('foo/lib/foo.dart'), '');
-    resourceProvider.newFile(packagePath('foo/lib/bar.dart'), '');
-    var cli = _createCli();
-    await runWithPreviewServer(cli, ['--skip-import-check', projectDir],
-        (url) async {
-      await assertPreviewServerResponsive(url!);
-      var output = logger.stdoutBuffer.toString();
-      expect(output, contains('Warning: package has unmigrated dependencies'));
-      // Output should not mention the particular unmigrated dependencies.
-      expect(output, isNot(contains('package:foo')));
-      // Output should mention that the user can rerun without
-      // `--skip-import-check`.
-      expect(output, contains('`--${CommandLineOptions.skipImportCheckFlag}`'));
-    });
-  }
-
-  test_lifecycle_summary() async {
-    var projectContents = simpleProject();
-    var projectDir = createProjectDir(projectContents);
-    var summaryPath = resourceProvider.convertPath('/summary.json');
-    var cliRunner = _createCli().decodeCommandLineArgs(_parseArgs(
-        ['--no-web-preview', '--summary', summaryPath, projectDir]))!;
-    await cliRunner.run();
-    var summaryData =
-        jsonDecode(resourceProvider.getFile(summaryPath).readAsStringSync());
-    expect(summaryData, TypeMatcher());
-    expect(summaryData, contains('changes'));
-    assertNormalExit(cliRunner);
-  }
-
-  test_lifecycle_summary_does_not_double_count_hint_removals() async {
-    var projectContents = simpleProject(sourceText: 'int/*?*/ x;');
-    var projectDir = createProjectDir(projectContents);
-    var summaryPath = resourceProvider.convertPath('/summary.json');
-    var cliRunner = _createCli().decodeCommandLineArgs(_parseArgs(
-        ['--no-web-preview', '--summary', summaryPath, projectDir]))!;
-    await cliRunner.run();
-    assertNormalExit(cliRunner);
-    var summaryData =
-        jsonDecode(resourceProvider.getFile(summaryPath).readAsStringSync());
-    var separator = resourceProvider.pathContext.separator;
-    expect(summaryData['changes']['byPath']['lib${separator}test.dart'],
-        {'makeTypeNullableDueToHint': 1});
-  }
-
-  test_lifecycle_summary_rewritten_upon_rerun() async {
-    var projectContents = simpleProject(sourceText: 'int f(int/*?*/ i) => i;');
-    var projectDir = createProjectDir(projectContents);
-    var cli = _createCli();
-    var summaryPath = resourceProvider.convertPath('/summary.json');
-    await runWithPreviewServer(cli, ['--summary', summaryPath, projectDir],
-        (url) async {
-      await assertPreviewServerResponsive(url!);
-      var summaryData =
-          jsonDecode(resourceProvider.getFile(summaryPath).readAsStringSync());
-      var separator = resourceProvider.pathContext.separator;
-      expect(summaryData['changes']['byPath']['lib${separator}test.dart'],
-          {'makeTypeNullableDueToHint': 1, 'makeTypeNullable': 1});
-      var testPath =
-          resourceProvider.pathContext.join(projectDir, 'lib', 'test.dart');
-      var newSourceText = 'int f(int/*?*/ i) => i + 1;';
-      resourceProvider.getFile(testPath).writeAsStringSync(newSourceText);
-      // Rerunning should create a new summary
-      var uri = Uri.parse(url);
-      var response = await httpPost(uri.replace(path: 'rerun-migration'),
-          headers: {'Content-Type': 'application/json; charset=UTF-8'});
-      assertHttpSuccess(response);
-      summaryData =
-          jsonDecode(resourceProvider.getFile(summaryPath).readAsStringSync());
-      expect(summaryData['changes']['byPath']['lib${separator}test.dart'], {
-        'typeNotMadeNullable': 1,
-        'makeTypeNullableDueToHint': 1,
-        'checkExpression': 1
-      });
-    });
-  }
-
-  test_lifecycle_uri_error() async {
-    var projectContents = simpleProject(sourceText: '''
-import 'package:does_not/exist.dart';
-int f() => null;
-''');
-    var projectDir = createProjectDir(projectContents);
-    await assertRunFailure([projectDir]);
-    var output = logger.stdoutBuffer.toString();
-    expect(output, contains('1 analysis issue found'));
-    expect(output, contains('uri_does_not_exist'));
-    expect(output, isNot(contains('erroneous migration suggestions')));
-    expect(output, contains('Run `dart pub get`'));
-    expect(output, contains('Try running `dart migrate` again'));
-    expect(output, isNot(contains('Set the lower SDK constraint')));
-  }
-
-  test_migrate_path_absolute() {
-    resourceProvider.newFolder(resourceProvider.pathContext
-        .join(resourceProvider.pathContext.current, 'foo'));
-    expect(
-        resourceProvider.pathContext
-            .isAbsolute(assertParseArgsSuccess(['foo']).directory),
-        isTrue);
-  }
-
-  test_migrate_path_file() {
-    resourceProvider.newFile(resourceProvider.pathContext.absolute('foo'), '');
-    expect(assertDecodeArgsFailure(['foo']), contains('foo is a file'));
-  }
-
-  test_migrate_path_non_existent() {
-    expect(assertDecodeArgsFailure(['foo']), contains('foo does not exist'));
-  }
-
-  test_migrate_path_none() {
-    expect(assertParseArgsSuccess([]).directory,
-        resourceProvider.pathContext.current);
-  }
-
-  test_migrate_path_normalized() {
-    expect(assertParseArgsSuccess(['foo/..']).directory, isNot(contains('..')));
-  }
-
-  test_migrate_path_one() {
-    resourceProvider.newFolder(resourceProvider.pathContext
-        .join(resourceProvider.pathContext.current, 'foo'));
-    expect(
-        assertParseArgsSuccess(['foo']).directory,
-        resourceProvider.pathContext
-            .join(resourceProvider.pathContext.current, 'foo'));
-  }
-
-  test_migrate_path_two() async {
-    var stderrText = await assertRunFailure(['foo', 'bar'], withUsage: true);
-    expect(stderrText, contains('No more than one path may be specified'));
-  }
-
-  test_option_preview_hostname() {
-    expect(
-        assertParseArgsSuccess(['--preview-hostname', 'any']).previewHostname,
-        'any');
-  }
-
-  test_option_preview_hostname_default() {
-    expect(assertParseArgsSuccess([]).previewHostname, 'localhost');
-  }
-
-  test_option_preview_port() {
-    expect(
-        assertParseArgsSuccess(['--preview-port', '4040']).previewPort, 4040);
-  }
-
-  test_option_preview_port_default() {
-    expect(assertParseArgsSuccess([]).previewPort, isNull);
-  }
-
-  test_option_preview_port_format_error() {
-    expect(assertDecodeArgsFailure(['--preview-port', 'abc']),
-        contains('Invalid value for --preview-port'));
-  }
-
-  test_option_sdk() {
-    var path = Uri.parse('file:///foo/bar/baz').toFilePath();
-    expect(assertParseArgsSuccess(['--sdk-path', path]).sdkPath, same(path));
-  }
-
-  test_option_sdk_default() {
-    var cli = _createCli();
-    var cliRunner = cli.decodeCommandLineArgs(_parseArgs([]))!;
-    expect(cliRunner.options.sdkPath,
-        cli._test.resourceProvider.convertPath(sdkRootPathPosix));
-  }
-
-  test_option_sdk_hidden() {
-    var optionName = '--sdk-path';
-    expect(_getHelpText(verbose: false), isNot(contains(optionName)));
-    expect(_getHelpText(verbose: true), contains(optionName));
-  }
-
-  test_option_summary() {
-    var summaryPath = resourceProvider.convertPath('/summary.json');
-    expect(assertParseArgsSuccess(['--summary', summaryPath]).summary,
-        summaryPath);
-  }
-
-  test_option_unrecognized() async {
-    expect(
-        await assertParseArgsFailure(['--this-option-does-not-exist']),
-        contains(
-            'Could not find an option named "this-option-does-not-exist"'));
-  }
-
-  test_package_config_does_not_exist() async {
-    var projectContents = simpleProject()
-      ..remove('.dart_tool/package_config.json');
-    var projectDir = createProjectDir(projectContents);
-
-    if (dartVersionIsNullSafeByDefault) {
-      // The lack of a package config file means the test file is already opted
-      // in.
-      await assertRunFailure(['--apply-changes', projectDir]);
-      _expectErrorIndicatingCodeIsAlreadyOptedIn();
-    } else {
-      var cliRunner = _createCli()
-          .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-      await cliRunner.run();
-      // The Dart source code should still be migrated.
-      assertProjectContents(
-          projectDir,
-          simpleProject(migrated: true)
-            ..remove('.dart_tool/package_config.json'));
-    }
-  }
-
-  test_package_config_is_missing_languageVersion() async {
-    var packageConfigText = '''
-{
-  "configVersion": 2,
-  "packages": [
-    {
-      "name": "test",
-      "rootUri": "../",
-      "packageUri": "lib/"
-    }
-  ]
-}
-''';
-    var projectContents = simpleProject(packageConfigText: packageConfigText);
-    var projectDir = createProjectDir(projectContents);
-
-    if (dartVersionIsNullSafeByDefault) {
-      // An omitted languageVersion field means the code is opted in to null
-      // safety.
-      await assertRunFailure(['--apply-changes', projectDir]);
-      _expectErrorIndicatingCodeIsAlreadyOptedIn();
-    } else {
-      var cliRunner = _createCli()
-          .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-      await cliRunner.run();
-      // The Dart source code should still be migrated.
-      assertProjectContents(projectDir,
-          simpleProject(migrated: true, packageConfigText: packageConfigText));
-    }
-  }
-
-  test_package_config_is_missing_this_package() async {
-    var packageConfigText = '''
-{
-  "configVersion": 2,
-  "packages": [
-  ]
-}
-''';
-    var projectContents = simpleProject(packageConfigText: packageConfigText);
-    var projectDir = createProjectDir(projectContents);
-
-    if (dartVersionIsNullSafeByDefault) {
-      // An omitted entry in the package config means the code is opted in to null
-      // safety.
-      await assertRunFailure(['--apply-changes', projectDir]);
-      _expectErrorIndicatingCodeIsAlreadyOptedIn();
-    } else {
-      var cliRunner = _createCli()
-          .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-      await cliRunner.run();
-      // The Dart source code should still be migrated.
-      assertProjectContents(projectDir,
-          simpleProject(migrated: true, packageConfigText: packageConfigText));
-    }
-  }
-
-  test_package_config_is_wrong_version() async {
-    var packageConfigText = '''
-{
-  "configVersion": 3,
-  "packages": [
-    {
-      "name": "test",
-      "rootUri": "../",
-      "packageUri": "lib/",
-      "languageVersion": "2.6"
-    }
-  ]
-}
-''';
-    var projectContents = simpleProject(packageConfigText: packageConfigText);
-    var projectDir = createProjectDir(projectContents);
-
-    if (dartVersionIsNullSafeByDefault) {
-      // An unreadable package config means the code is opted in to null safety.
-      await assertRunFailure(['--apply-changes', projectDir]);
-      _expectErrorIndicatingCodeIsAlreadyOptedIn();
-    } else {
-      var cliRunner = _createCli()
-          .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-      await cliRunner.run();
-      // The Dart source code should still be migrated.
-      assertProjectContents(projectDir,
-          simpleProject(migrated: true, packageConfigText: packageConfigText));
-    }
-  }
-
-  test_pubspec_add_collection_dependency() async {
-    var projectContents = simpleProject(sourceText: '''
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''', pubspecText: '''
-name: test
-environment:
-  sdk: '>=2.6.0 <3.0.0'
-dependencies:
-  foo: ^1.2.3
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    expect(
-        logger.stdoutBuffer.toString(), contains('Please run `dart pub get`'));
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir, simpleProject(migrated: true, sourceText: '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? firstEven(Iterable x)
-    => x.firstWhereOrNull((x) => x.isEven);
-''', pubspecText: '''
-name: test
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-dependencies:
-  foo: ^1.2.3
-  collection: ^1.15.0-nullsafety.4
-'''));
-  }
-
-  test_pubspec_add_dependency_and_environment_sections() async {
-    var projectContents = simpleProject(sourceText: '''
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''', pubspecText: '''
-name: test
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    expect(
-        logger.stdoutBuffer.toString(), contains('Please run `dart pub get`'));
-    // The Dart source code should still be migrated.
-    assertProjectContents(projectDir, simpleProject(
-        migrated: true,
-        sourceText: '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? firstEven(Iterable x)
-    => x.firstWhereOrNull((x) => x.isEven);
-''',
-        // Note: section order is weird, but it's valid and this is a rare use
-        // case.
-        pubspecText: '''
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-dependencies:
-  collection: ^1.15.0-nullsafety.4
-name: test
-'''));
-  }
-
-  test_pubspec_add_dependency_section() async {
-    var projectContents = simpleProject(sourceText: '''
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    expect(
-        logger.stdoutBuffer.toString(), contains('Please run `dart pub get`'));
-    // The Dart source code should still be migrated.
-    assertProjectContents(projectDir, simpleProject(
-        migrated: true,
-        sourceText: '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? firstEven(Iterable x)
-    => x.firstWhereOrNull((x) => x.isEven);
-''',
-        // Note: `dependencies` section is in a weird place, but it's valid and
-        // this is a rare use case.
-        pubspecText: '''
-dependencies:
-  collection: ^1.15.0-nullsafety.4
-name: test
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-'''));
-  }
-
-  test_pubspec_does_not_exist() async {
-    var projectContents = simpleProject()..remove('pubspec.yaml');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir,
-        simpleProject(
-            migrated: true,
-            // The package config file should not have been touched.
-            packageConfigText: _getPackageConfigText(migrated: false))
-          ..remove('pubspec.yaml'));
-  }
-
-  test_pubspec_environment_is_missing_sdk() async {
-    var projectContents = simpleProject(pubspecText: '''
-name: test
-environment:
-  foo: 1
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir, simpleProject(migrated: true, pubspecText: '''
-name: test
-environment:
-  foo: 1
-  sdk: '>=2.12.0 <3.0.0'
-'''));
-  }
-
-  test_pubspec_environment_is_not_a_map() async {
-    var pubspecText = '''
-name: test
-environment: 1
-''';
-    var projectContents = simpleProject(pubspecText: pubspecText);
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir, simpleProject(migrated: true, pubspecText: pubspecText));
-  }
-
-  test_pubspec_environment_sdk_is_exact_version() async {
-    var pubspecText = '''
-name: test
-environment:
-  sdk: '2.0.0'
-''';
-    var projectContents = simpleProject(pubspecText: pubspecText);
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir,
-        simpleProject(
-            migrated: true,
-            pubspecText: pubspecText,
-            // The package config file should not have been touched.
-            packageConfigText: _getPackageConfigText(migrated: false)));
-  }
-
-  test_pubspec_environment_sdk_is_missing_min() async {
-    var pubspecText = '''
-name: test
-environment:
-  sdk: '<3.0.0'
-''';
-    var projectContents = simpleProject(pubspecText: pubspecText);
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir,
-        simpleProject(
-            migrated: true,
-            pubspecText: pubspecText,
-            // The package config file should not have been touched.
-            packageConfigText: _getPackageConfigText(migrated: false)));
-  }
-
-  test_pubspec_environment_sdk_is_not_string() async {
-    var pubspecText = '''
-name: test
-environment:
-  sdk: 1
-''';
-    var projectContents = simpleProject(pubspecText: pubspecText);
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir,
-        simpleProject(
-            migrated: true,
-            pubspecText: pubspecText,
-            // The package config file should not have been touched.
-            packageConfigText: _getPackageConfigText(migrated: false)));
-  }
-
-  test_pubspec_environment_sdk_is_union() async {
-    var pubspecText = '''
-name: test
-environment:
-  sdk: '>=2.0.0 <2.1.0 >=2.2.0 <3.0.0'
-''';
-    var projectContents = simpleProject(pubspecText: pubspecText);
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir,
-        simpleProject(
-            migrated: true,
-            pubspecText: pubspecText,
-            // The package config file should not have been touched.
-            packageConfigText: _getPackageConfigText(migrated: false)));
-  }
-
-  test_pubspec_has_unusual_max_sdk_constraint() async {
-    // No one should be using a weird max SDK constraint like this.  If they are
-    // doing so, we'll fix it to 3.0.0.
-    var projectContents = simpleProject(pubspecText: '''
-name: test
-environment:
-  sdk: '>=2.6.0 <2.17.4'
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir, simpleProject(migrated: true, pubspecText: '''
-name: test
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-'''));
-  }
-
-  test_pubspec_is_missing_environment() async {
-    var projectContents = simpleProject(pubspecText: '''
-name: test
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    // The Dart source code should still be migrated.
-    assertProjectContents(projectDir, simpleProject(migrated: true, pubspecText:
-        // This is strange-looking, but valid.
-        '''
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-name: test
-'''));
-  }
-
-  test_pubspec_is_not_a_map() async {
-    var projectContents = simpleProject(pubspecText: 'not-a-map');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    var message = await assertErrorExit(
-        cliRunner, () async => await cliRunner.run(),
-        withUsage: false);
-    expect(message, contains('Failed to parse pubspec file'));
-  }
-
-  test_pubspec_preserve_collection_dependency() async {
-    var projectContents = simpleProject(sourceText: '''
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''', pubspecText: '''
-name: test
-environment:
-  sdk: '>=2.6.0 <3.0.0'
-dependencies:
-  collection: ^1.16.0
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    expect(logger.stdoutBuffer.toString(),
-        isNot(contains('Please run `dart pub get`')));
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir, simpleProject(migrated: true, sourceText: '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? firstEven(Iterable x)
-    => x.firstWhereOrNull((x) => x.isEven);
-''', pubspecText: '''
-name: test
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-dependencies:
-  collection: ^1.16.0
-'''));
-  }
-
-  test_pubspec_update_collection_dependency() async {
-    var projectContents = simpleProject(sourceText: '''
-int firstEven(Iterable x)
-    => x.firstWhere((x) => x.isEven, orElse: () => null);
-''', pubspecText: '''
-name: test
-environment:
-  sdk: '>=2.6.0 <3.0.0'
-dependencies:
-  collection: ^1.14.0
-''');
-    var projectDir = createProjectDir(projectContents);
-    var cliRunner = _createCli()
-        .decodeCommandLineArgs(_parseArgs(['--apply-changes', projectDir]))!;
-    await cliRunner.run();
-    expect(
-        logger.stdoutBuffer.toString(), contains('Please run `dart pub get`'));
-    // The Dart source code should still be migrated.
-    assertProjectContents(
-        projectDir, simpleProject(migrated: true, sourceText: '''
-import 'package:collection/collection.dart' show IterableExtension;
-
-int? firstEven(Iterable x)
-    => x.firstWhereOrNull((x) => x.isEven);
-''', pubspecText: '''
-name: test
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-dependencies:
-  collection: ^1.15.0-nullsafety.4
-'''));
-  }
-
-  test_uses_physical_resource_provider_by_default() {
-    var cli = MigrationCli(binaryName: 'nnbd_migration');
-    expect(cli.resourceProvider, same(PhysicalResourceProvider.INSTANCE));
-  }
-
-  Future tryGetSourceFromServer(Uri uri, String path) async {
-    var authToken = uri.queryParameters['authToken'];
-    return await httpGet(
-        uri.replace(
-            path: resourceProvider.pathContext.toUri(path).path,
-            queryParameters: {'inline': 'true', 'authToken': authToken}),
-        headers: {'Content-Type': 'application/json; charset=UTF-8'});
-  }
-
-  _MigrationCli _createCli() {
-    mock_sdk.createMockSdk(
-      resourceProvider: resourceProvider,
-      root: resourceProvider.newFolder(
-        resourceProvider.convertPath(sdkRootPathPosix),
-      ),
-    );
-    return _MigrationCli(this);
-  }
-
-  void _expectErrorIndicatingCodeIsAlreadyOptedIn() {
-    var errorOutput = logger.stdoutBuffer.toString();
-    expect(errorOutput, contains('1 analysis issue found:'));
-    expect(
-        errorOutput,
-        contains("A value of type 'Null' can't be returned from the function "
-            "'f' because it has a return type of 'int'"));
-    expect(errorOutput, contains('Set the lower SDK constraint'));
-  }
-
-  String _getHelpText({required bool verbose}) {
-    var cliRunner = _createCli().decodeCommandLineArgs(_parseArgs(
-        ['--${CommandLineOptions.helpFlag}', if (verbose) '--verbose']));
-    expect(cliRunner, isNull);
-    var helpText = logger.stderrBuffer.toString();
-    return helpText;
-  }
-
-  String _getPackageConfigText(
-      {required bool migrated, Map packagesMigrated = const {}}) {
-    Object makePackageEntry(String name, bool migrated, {String? rootUri}) {
-      rootUri ??=
-          resourceProvider.pathContext.toUri(packagePath(name)).toString();
-      return {
-        'name': name,
-        'rootUri': rootUri,
-        'packageUri': 'lib/',
-        'languageVersion': migrated ? '2.12' : '2.6'
-      };
-    }
-
-    var json = {
-      'configVersion': 2,
-      'packages': [
-        makePackageEntry('test', migrated, rootUri: '../'),
-        for (var entry in packagesMigrated.entries)
-          makePackageEntry(entry.key, entry.value)
-      ]
-    };
-    return '${JsonEncoder.withIndent('  ').convert(json)}\n';
-  }
-
-  ArgResults _parseArgs(List args) {
-    return MigrationCli.createParser().parse(args);
-  }
-
-  Future _tellPreviewToApplyChanges(String url) async {
-    var uri = Uri.parse(url);
-    var authToken = uri.queryParameters['authToken'];
-    var response = await httpPost(
-        uri.replace(
-            path: PreviewSite.applyMigrationPath,
-            queryParameters: {'authToken': authToken}),
-        headers: {'Content-Type': 'application/json; charset=UTF-8'},
-        body: json.encode({'navigationTree': []}));
-    assertHttpSuccess(response);
-  }
-}
-
-@reflectiveTest
-class _MigrationCliTestPosix extends _MigrationCliTestBase
-    with _MigrationCliTestMethods {
-  @override
-  final MemoryResourceProvider resourceProvider;
-
-  _MigrationCliTestPosix()
-      : resourceProvider = MemoryResourceProvider(
-            context: path.style == path.Style.posix
-                ? null
-                : path.Context(
-                    style: path.Style.posix, current: '/working_dir'));
-}
-
-@reflectiveTest
-class _MigrationCliTestWindows extends _MigrationCliTestBase
-    with _MigrationCliTestMethods {
-  @override
-  final MemoryResourceProvider resourceProvider;
-
-  _MigrationCliTestWindows()
-      : resourceProvider = MemoryResourceProvider(
-            context: path.style == path.Style.windows
-                ? null
-                : path.Context(
-                    style: path.Style.windows, current: 'C:\\working_dir'));
-}
diff --git a/pkg/nnbd_migration/test/migration_visitor_test_base.dart b/pkg/nnbd_migration/test/migration_visitor_test_base.dart
deleted file mode 100644
index ae06d266100b..000000000000
--- a/pkg/nnbd_migration/test/migration_visitor_test_base.dart
+++ /dev/null
@@ -1,516 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/nullability_suffix.dart';
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/source/source.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:analyzer/src/dart/element/type_system.dart';
-import 'package:analyzer/src/generated/utilities_dart.dart';
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/src/conditional_discard.dart';
-import 'package:nnbd_migration/src/decorated_class_hierarchy.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/edge_builder.dart';
-import 'package:nnbd_migration/src/expression_checks.dart';
-import 'package:nnbd_migration/src/node_builder.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:nnbd_migration/src/nullability_node_target.dart';
-import 'package:nnbd_migration/src/variables.dart';
-import 'package:test/test.dart';
-
-import 'abstract_single_unit.dart';
-
-/// A [NodeMatcher] that matches any node, and records what node it matched to.
-class AnyNodeMatcher extends _RecordingNodeMatcher {
-  @override
-  bool matches(NullabilityNode? node) {
-    return true;
-  }
-}
-
-/// Mixin allowing unit tests to create decorated types easily.
-mixin DecoratedTypeTester implements DecoratedTypeTesterBase {
-  int nodeId = 0;
-
-  NullabilityNode get always => graph.always;
-
-  DecoratedType get bottom => DecoratedType(typeProvider.bottomType, never);
-
-  DecoratedType get dynamic_ => DecoratedType(typeProvider.dynamicType, always);
-
-  NullabilityNode get never => graph.never;
-
-  DecoratedType get null_ => DecoratedType(typeProvider.nullType, always);
-
-  DecoratedType get void_ => DecoratedType(typeProvider.voidType, always);
-
-  DecoratedType function(DecoratedType returnType,
-      {List required = const [],
-      List positional = const [],
-      Map named = const {},
-      List typeFormals = const [],
-      NullabilityNode? node}) {
-    int i = 0;
-    var parameters = required
-        .map((t) => ParameterElementImpl.synthetic(
-            'p${i++}', t.type!, ParameterKind.REQUIRED))
-        .toList();
-    parameters.addAll(positional.map((t) => ParameterElementImpl.synthetic(
-        'p${i++}', t.type!, ParameterKind.POSITIONAL)));
-    parameters.addAll(named.entries.map((e) => ParameterElementImpl.synthetic(
-        e.key, e.value.type!, ParameterKind.NAMED)));
-    return DecoratedType(
-        FunctionTypeImpl(
-          typeFormals: typeFormals,
-          parameters: parameters,
-          returnType: returnType.type!,
-          nullabilitySuffix: NullabilitySuffix.star,
-        ),
-        node ?? newNode(),
-        returnType: returnType,
-        positionalParameters: required.toList()..addAll(positional),
-        namedParameters: named);
-  }
-
-  DecoratedType future(DecoratedType parameter, {NullabilityNode? node}) {
-    return DecoratedType(
-        typeProvider.futureType(parameter.type!), node ?? newNode(),
-        typeArguments: [parameter]);
-  }
-
-  DecoratedType futureOr(DecoratedType parameter, {NullabilityNode? node}) {
-    return DecoratedType(
-        typeProvider.futureOrType(parameter.type!), node ?? newNode(),
-        typeArguments: [parameter]);
-  }
-
-  DecoratedType int_({NullabilityNode? node}) =>
-      DecoratedType(typeProvider.intType, node ?? newNode());
-
-  DecoratedType iterable(DecoratedType elementType, {NullabilityNode? node}) =>
-      DecoratedType(
-          typeProvider.iterableType(elementType.type!), node ?? newNode(),
-          typeArguments: [elementType]);
-
-  DecoratedType list(DecoratedType elementType, {NullabilityNode? node}) =>
-      DecoratedType(typeProvider.listType(elementType.type!), node ?? newNode(),
-          typeArguments: [elementType]);
-
-  NullabilityNode newNode() => NullabilityNode.forTypeAnnotation(
-      NullabilityNodeTarget.text('node ${nodeId++}'));
-
-  DecoratedType num_({NullabilityNode? node}) =>
-      DecoratedType(typeProvider.numType, node ?? newNode());
-
-  DecoratedType object({NullabilityNode? node}) =>
-      DecoratedType(typeProvider.objectType, node ?? newNode());
-
-  TypeParameterElement typeParameter(String name, DecoratedType bound) {
-    var element = TypeParameterElementImpl.synthetic(name);
-    element.bound = bound.type;
-    decoratedTypeParameterBounds.put(element, bound);
-    return element;
-  }
-
-  DecoratedType typeParameterType(TypeParameterElement typeParameter,
-      {NullabilityNode? node}) {
-    return DecoratedType(
-      typeParameter.instantiate(
-        nullabilitySuffix: NullabilitySuffix.star,
-      ),
-      node ?? newNode(),
-    );
-  }
-}
-
-/// Base functionality that must be implemented by classes mixing in
-/// [DecoratedTypeTester].
-abstract class DecoratedTypeTesterBase {
-  DecoratedTypeParameterBounds get decoratedTypeParameterBounds;
-
-  NullabilityGraph get graph;
-
-  TypeProvider get typeProvider;
-}
-
-class EdgeBuilderTestBase extends MigrationVisitorTestBase {
-  DecoratedClassHierarchy? decoratedClassHierarchy;
-
-  /// Analyzes the given source code, producing constraint variables and
-  /// constraints for it.
-  @override
-  Future analyze(String code) async {
-    var unit = await super.analyze(code);
-    decoratedClassHierarchy = DecoratedClassHierarchy(variables, graph);
-    unit.accept(EdgeBuilder(
-        typeProvider,
-        typeSystem,
-        variables,
-        graph,
-        testSource,
-        null,
-        decoratedClassHierarchy,
-        unit.declaredElement!.library));
-    return unit;
-  }
-}
-
-/// Mixin allowing unit tests to check for the presence of graph edges.
-mixin EdgeTester {
-  /// Gets the set of all nodes pointed to by always, plus always itself.
-  Set get alwaysPlus {
-    var result = {graph.always};
-    for (var edge in getEdges(graph.always, anyNode)) {
-      if (edge.guards.isEmpty) {
-        result.add(edge.destinationNode);
-      }
-    }
-    return result;
-  }
-
-  /// Returns a [NodeMatcher] that matches any node whatsoever.
-  AnyNodeMatcher get anyNode => AnyNodeMatcher();
-
-  NullabilityGraphForTesting get graph;
-
-  /// Gets the transitive closure of all nodes with hard edges pointing to
-  /// never, plus never itself.
-  Set get neverClosure {
-    var result = {};
-    var pending = [graph.never];
-    while (pending.isNotEmpty) {
-      var node = pending.removeLast();
-      if (result.add(node)) {
-        for (var edge in getEdges(anyNode, node)) {
-          pending.add(edge.sourceNode);
-        }
-      }
-    }
-    return result;
-  }
-
-  /// Gets the set of nodes with hard edges pointing to never.
-  Set get pointsToNever {
-    return {for (var edge in getEdges(anyNode, graph.never)) edge.sourceNode};
-  }
-
-  /// Asserts that a dummy edge exists from [source] to always.
-  NullabilityEdge assertDummyEdge(Object? source) =>
-      assertEdge(source, graph.always, hard: false, checkable: false);
-
-  /// Asserts that an edge exists with a node matching [source] and a node
-  /// matching [destination], and with the given [hard]ness and [guards].
-  ///
-  /// [source] and [destination] are converted to [NodeMatcher] objects if they
-  /// aren't already.  In practice this means that the caller can pass in either
-  /// a [NodeMatcher] or a [NullabilityNode].
-  NullabilityEdge assertEdge(Object? source, Object? destination,
-      {required bool hard,
-      bool checkable = true,
-      bool isSetupAssignment = false,
-      Object guards = isEmpty,
-      Object? codeReference}) {
-    var edges = getEdges(source, destination);
-    if (edges.isEmpty) {
-      fail('Expected edge $source -> $destination, found none');
-    } else if (edges.length != 1) {
-      fail('Found multiple edges $source -> $destination');
-    } else {
-      var edge = edges[0];
-      expect(edge.isHard, hard);
-      expect(edge.isCheckable, checkable);
-      expect(edge.isSetupAssignment, isSetupAssignment);
-      expect(edge.guards, guards);
-      if (codeReference != null) {
-        expect(edge.codeReference, codeReference);
-      }
-      return edge;
-    }
-  }
-
-  /// Asserts that no edge exists with a node matching [source] and a node
-  /// matching [destination].
-  ///
-  /// [source] and [destination] are converted to [NodeMatcher] objects if they
-  /// aren't already.  In practice this means that the caller can pass in either
-  /// a [NodeMatcher] or a [NullabilityNode].
-  void assertNoEdge(Object? source, Object? destination) {
-    var edges = getEdges(source, destination);
-    if (edges.isNotEmpty) {
-      fail('Expected no edge $source -> $destination, found $edges');
-    }
-  }
-
-  /// Asserts that a union-type edge exists between nodes [x] and [y].
-  ///
-  /// [x] and [y] are converted to [NodeMatcher] objects if they aren't already.
-  /// In practice this means that the caller can pass in either a [NodeMatcher]
-  /// or a [NullabilityNode].
-  void assertUnion(Object? x, Object? y) {
-    var edges = getEdges(x, y);
-    for (var edge in edges) {
-      if (edge.isUnion) {
-        expect(edge.upstreamNodes, hasLength(1));
-        return;
-      }
-    }
-    fail('Expected union between $x and $y, not found');
-  }
-
-  /// Gets a list of all edges whose source matches [source] and whose
-  /// destination matches [destination].
-  ///
-  /// [source] and [destination] are converted to [NodeMatcher] objects if they
-  /// aren't already.  In practice this means that the caller can pass in either
-  /// a [NodeMatcher] or a [NullabilityNode].
-  List getEdges(Object? source, Object? destination) {
-    var sourceMatcher = NodeMatcher(source);
-    var destinationMatcher = NodeMatcher(destination);
-    var result = [];
-    for (var edge in graph.getAllEdges()) {
-      if (sourceMatcher.matches(edge.sourceNode) &&
-          destinationMatcher.matches(edge.destinationNode)) {
-        sourceMatcher.matched(edge.sourceNode);
-        destinationMatcher.matched(edge.destinationNode);
-        result.add(edge);
-      }
-    }
-    return result;
-  }
-
-  /// Returns a [NodeMatcher] that matches any node in the given set.
-  NodeSetMatcher inSet(Set nodes) => NodeSetMatcher(nodes);
-
-  /// Creates a [NodeMatcher] matching a substitution node whose inner and outer
-  /// nodes match [inner] and [outer].
-  ///
-  /// [inner] and [outer] are converted to [NodeMatcher] objects if they aren't
-  /// already.  In practice this means that the caller can pass in either a
-  /// [NodeMatcher] or a [NullabilityNode].
-  NodeMatcher substitutionNode(Object? inner, Object? outer) =>
-      _SubstitutionNodeMatcher(NodeMatcher(inner), NodeMatcher(outer));
-}
-
-/// Mock representation of constraint variables.
-class InstrumentedVariables extends Variables {
-  final _conditionalDiscard = {};
-
-  final _decoratedExpressionTypes = {};
-
-  final _expressionChecks = {};
-
-  InstrumentedVariables(super.graph, super.typeProvider);
-
-  /// Gets the [ExpressionChecks] associated with the given [expression].
-  ExpressionChecksOrigin? checkExpression(Expression expression) =>
-      _expressionChecks[_normalizeExpression(expression)];
-
-  /// Gets the [conditionalDiscard] associated with the given [expression].
-  ConditionalDiscard? conditionalDiscard(AstNode node) =>
-      _conditionalDiscard[node];
-
-  /// Gets the [DecoratedType] associated with the given [expression].
-  DecoratedType? decoratedExpressionType(Expression expression) =>
-      _decoratedExpressionTypes[_normalizeExpression(expression)];
-
-  @override
-  void recordConditionalDiscard(
-      Source? source, AstNode node, ConditionalDiscard conditionalDiscard) {
-    _conditionalDiscard[node] = conditionalDiscard;
-    super.recordConditionalDiscard(source, node, conditionalDiscard);
-  }
-
-  void recordDecoratedExpressionType(Expression node, DecoratedType? type) {
-    super.recordDecoratedExpressionType(node, type);
-    _decoratedExpressionTypes[_normalizeExpression(node)] = type;
-  }
-
-  @override
-  void recordExpressionChecks(
-      Source? source, Expression expression, ExpressionChecksOrigin origin) {
-    super.recordExpressionChecks(source, expression, origin);
-    _expressionChecks[_normalizeExpression(expression)] = origin;
-  }
-
-  /// Unwraps any parentheses surrounding [expression].
-  Expression _normalizeExpression(Expression expression) {
-    while (expression is ParenthesizedExpression) {
-      expression = expression.expression;
-    }
-    return expression;
-  }
-}
-
-class MigrationVisitorTestBase extends AbstractSingleUnitTest with EdgeTester {
-  late InstrumentedVariables variables;
-
-  final NullabilityGraphForTesting graph;
-
-  final decoratedTypeParameterBounds = DecoratedTypeParameterBounds();
-
-  MigrationVisitorTestBase() : this._(NullabilityGraphForTesting());
-
-  MigrationVisitorTestBase._(this.graph);
-
-  NullabilityNode get always => graph.always;
-
-  NullabilityNode get never => graph.never;
-
-  TypeProvider get typeProvider => testAnalysisResult.typeProvider;
-
-  TypeSystemImpl get typeSystem =>
-      testAnalysisResult.typeSystem as TypeSystemImpl;
-
-  Future analyze(String code) async {
-    await resolveTestUnit(code);
-    variables = InstrumentedVariables(graph, typeProvider);
-    testUnit!
-        .accept(NodeBuilder(variables, testSource, null, graph, typeProvider));
-    return testUnit!;
-  }
-
-  /// Gets the [DecoratedType] associated with the constructor declaration whose
-  /// name matches [search].
-  DecoratedType decoratedConstructorDeclaration(String search) => variables
-      .decoratedElementType(findNode.constructor(search).declaredElement!);
-
-  Map decoratedDirectSupertypes(String name) {
-    return variables.decoratedDirectSupertypes(findElement.classOrMixin(name));
-  }
-
-  /// Gets the [DecoratedType] associated with the generic function type
-  /// annotation whose text is [text].
-  DecoratedType decoratedGenericFunctionTypeAnnotation(String text) {
-    return variables.decoratedTypeAnnotation(
-        testSource, findNode.genericFunctionType(text));
-  }
-
-  /// Gets the [DecoratedType] associated with the method declaration whose
-  /// name matches [search].
-  DecoratedType decoratedMethodType(String search) =>
-      variables.decoratedElementType(
-          findNode.methodDeclaration(search).declaredElement!);
-
-  /// Gets the [DecoratedType] associated with the type annotation whose text
-  /// is [text].
-  DecoratedType decoratedTypeAnnotation(String text) {
-    return variables.decoratedTypeAnnotation(
-        testSource, findNode.typeAnnotation(text));
-  }
-
-  /// Gets the [ConditionalDiscard] information associated with the collection
-  /// element whose text is [text].
-  ConditionalDiscard? elementDiscard(String text) {
-    return variables.conditionalDiscard(findNode.collectionElement(text));
-  }
-
-  /// Returns a [Matcher] that matches a [CodeReference] pointing to the given
-  /// file [offset], with the given [function] name.
-  TypeMatcher matchCodeRef(
-      {required int offset, required String function}) {
-    var location = testUnit!.lineInfo.getLocation(offset);
-    return TypeMatcher()
-        .having((cr) => cr.line, 'line', location.lineNumber)
-        .having((cr) => cr.column, 'column', location.columnNumber)
-        .having((cr) => cr.function, 'function', function);
-  }
-
-  void setUp() {
-    DecoratedTypeParameterBounds.current = decoratedTypeParameterBounds;
-    super.setUp();
-  }
-
-  /// Gets the [ConditionalDiscard] information associated with the statement
-  /// whose text is [text].
-  ConditionalDiscard? statementDiscard(String text) {
-    return variables.conditionalDiscard(findNode.statement(text));
-  }
-
-  void tearDown() {
-    DecoratedTypeParameterBounds.current = null;
-    super.tearDown();
-  }
-}
-
-/// Abstract base class representing a thing that can be matched against
-/// nullability nodes.
-abstract class NodeMatcher {
-  factory NodeMatcher(Object? expectation) {
-    if (expectation is NodeMatcher) return expectation;
-    if (expectation is NullabilityNode) return _ExactNodeMatcher(expectation);
-    fail(
-        'Unclear how to match node expectation of type ${expectation.runtimeType}');
-  }
-
-  void matched(NullabilityNode? node);
-
-  bool matches(NullabilityNode? node);
-}
-
-/// A [NodeMatcher] that matches any node contained in the given set.
-class NodeSetMatcher extends _RecordingNodeMatcher {
-  final Set _targetSet;
-
-  NodeSetMatcher(this._targetSet);
-
-  @override
-  bool matches(NullabilityNode? node) => _targetSet.contains(node);
-}
-
-/// A [NodeMatcher] that matches exactly one node.
-class _ExactNodeMatcher implements NodeMatcher {
-  final NullabilityNode _expectation;
-
-  _ExactNodeMatcher(this._expectation);
-
-  @override
-  void matched(NullabilityNode? node) {}
-
-  @override
-  bool matches(NullabilityNode? node) => node == _expectation;
-}
-
-/// Base class for [NodeMatcher]s that remember which nodes were matched.
-abstract class _RecordingNodeMatcher implements NodeMatcher {
-  final List _matchingNodes = [];
-
-  NullabilityNode? get matchingNode => _matchingNodes.single;
-
-  @override
-  void matched(NullabilityNode? node) {
-    _matchingNodes.add(node);
-  }
-}
-
-/// A [NodeMatcher] that matches a substitution node with the given inner and
-/// outer nodes.
-class _SubstitutionNodeMatcher implements NodeMatcher {
-  final NodeMatcher inner;
-  final NodeMatcher outer;
-
-  _SubstitutionNodeMatcher(this.inner, this.outer);
-
-  @override
-  void matched(NullabilityNode? node) {
-    if (node is NullabilityNodeForSubstitution) {
-      inner.matched(node.innerNode);
-      outer.matched(node.outerNode);
-    } else {
-      throw StateError(
-          'matched should only be called on nodes for which matches returned '
-          'true');
-    }
-  }
-
-  @override
-  bool matches(NullabilityNode? node) {
-    return node is NullabilityNodeForSubstitution &&
-        inner.matches(node.innerNode) &&
-        outer.matches(node.outerNode);
-  }
-}
diff --git a/pkg/nnbd_migration/test/node_builder_test.dart b/pkg/nnbd_migration/test/node_builder_test.dart
deleted file mode 100644
index 12f2090865d6..000000000000
--- a/pkg/nnbd_migration/test/node_builder_test.dart
+++ /dev/null
@@ -1,2264 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/element/type.dart';
-import 'package:nnbd_migration/src/decorated_type.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/hint_action.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'migration_visitor_test_base.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(NodeBuilderTest);
-  });
-}
-
-@reflectiveTest
-class NodeBuilderTest extends MigrationVisitorTestBase {
-  /// Gets the [DecoratedType] associated with the function declaration whose
-  /// name matches [search].
-  DecoratedType decoratedFunctionType(String search) =>
-      variables.decoratedElementType(
-          findNode.functionDeclaration(search).declaredElement!);
-
-  DecoratedType? decoratedTypeParameterBound(String search) =>
-      variables.decoratedTypeParameterBound(
-          findNode.typeParameter(search).declaredElement!);
-
-  Future test_catch_clause_with_stacktrace_with_on() async {
-    await analyze('''
-void f() {
-  try {} on String catch (ex, st) {}
-}
-''');
-    var exceptionType = variables.decoratedElementType(
-        findNode.catchClauseParameter('ex').declaredElement!);
-    expect(exceptionType.node, TypeMatcher());
-    var stackTraceType = variables.decoratedElementType(
-        findNode.catchClauseParameter('st').declaredElement!);
-    assertEdge(stackTraceType.node, never, hard: true, checkable: false);
-  }
-
-  Future test_catch_clause_with_stacktrace_without_on() async {
-    await analyze('''
-void f() {
-  try {} catch (ex, st) {}
-}
-''');
-    var exceptionType = variables.decoratedElementType(
-        findNode.catchClauseParameter('ex').declaredElement!);
-    expect(exceptionType.node.isImmutable, false);
-    var stackTraceType = variables.decoratedElementType(
-        findNode.catchClauseParameter('st').declaredElement!);
-    assertEdge(stackTraceType.node, never, hard: true, checkable: false);
-  }
-
-  Future test_catch_clause_without_catch() async {
-    await analyze('''
-void f() {
-  try {} on String {}
-}
-''');
-    // No assertions, since no variables are declared; we just want to make sure
-    // we don't crash.
-  }
-
-  Future test_catch_clause_without_stacktrace_with_on() async {
-    await analyze('''
-void f() {
-  try {} on String catch (ex) {}
-}
-''');
-    var exceptionType = variables.decoratedElementType(
-        findNode.catchClauseParameter('ex').declaredElement!);
-    expect(exceptionType.node, TypeMatcher());
-  }
-
-  Future test_catch_clause_without_stacktrace_without_on() async {
-    await analyze('''
-void f() {
-  try {} catch (ex) {}
-}
-''');
-    var exceptionType = variables.decoratedElementType(
-        findNode.catchClauseParameter('ex').declaredElement!);
-    expect(exceptionType.node.isImmutable, false);
-  }
-
-  Future test_class_alias_synthetic_constructors_no_parameters() async {
-    await analyze('''
-class C {
-  C.a();
-  C.b();
-}
-mixin M {}
-class D = C with M;
-''');
-    var constructors = findElement.class_('D').constructors;
-    expect(constructors, hasLength(2));
-    var a = findElement.constructor('a', of: 'D');
-    var aType = variables.decoratedElementType(a);
-    _assertType(aType.type!, 'D Function()');
-    expect(aType.node, same(never));
-    expect(aType.typeArguments, isEmpty);
-    _assertType(aType.returnType!.type!, 'D');
-    expect(aType.returnType!.node, same(never));
-    var b = findElement.constructor('b', of: 'D');
-    var bType = variables.decoratedElementType(b);
-    _assertType(bType.type!, 'D Function()');
-    expect(bType.node, same(never));
-    expect(bType.typeArguments, isEmpty);
-    _assertType(bType.returnType!.type!, 'D');
-    expect(bType.returnType!.node, same(never));
-  }
-
-  Future test_class_alias_synthetic_constructors_with_parameters() async {
-    await analyze('''
-class C {
-  C.a(int i);
-  C.b([int i]);
-  C.c({int i});
-  C.d(List x);
-}
-mixin M {}
-class D = C with M;
-''');
-    var constructors = findElement.class_('D').constructors;
-    expect(constructors, hasLength(4));
-    var a = findElement.constructor('a', of: 'D');
-    var aType = variables.decoratedElementType(a);
-    _assertType(aType.type!, 'D Function(int)');
-    expect(aType.node, same(never));
-    expect(aType.typeArguments, isEmpty);
-    _assertType(aType.returnType!.type!, 'D');
-    expect(aType.returnType!.node, same(never));
-    expect(aType.positionalParameters, hasLength(1));
-    _assertType(aType.positionalParameters![0].type!, 'int');
-    expect(aType.positionalParameters![0].node,
-        TypeMatcher());
-    expect(aType.namedParameters, isEmpty);
-    var b = findElement.constructor('b', of: 'D');
-    var bType = variables.decoratedElementType(b);
-    _assertType(bType.type!, 'D Function([int])');
-    expect(bType.node, same(never));
-    expect(bType.typeArguments, isEmpty);
-    _assertType(bType.returnType!.type!, 'D');
-    expect(bType.returnType!.node, same(never));
-    expect(bType.positionalParameters, hasLength(1));
-    _assertType(bType.positionalParameters![0].type!, 'int');
-    expect(bType.positionalParameters![0].node,
-        TypeMatcher());
-    expect(bType.namedParameters, isEmpty);
-    var c = findElement.constructor('c', of: 'D');
-    var cType = variables.decoratedElementType(c);
-    _assertType(cType.type!, 'D Function({int i})');
-    expect(cType.node, same(never));
-    expect(cType.typeArguments, isEmpty);
-    _assertType(cType.returnType!.type!, 'D');
-    expect(cType.returnType!.node, same(never));
-    expect(cType.positionalParameters, isEmpty);
-    expect(cType.namedParameters, hasLength(1));
-    expect(cType.namedParameters, contains('i'));
-    _assertType(cType.namedParameters!['i']!.type!, 'int');
-    expect(cType.namedParameters!['i']!.node,
-        TypeMatcher());
-    var d = findElement.constructor('d', of: 'D');
-    var dType = variables.decoratedElementType(d);
-    _assertType(dType.type!, 'D Function(List)');
-    expect(dType.node, same(never));
-    expect(dType.typeArguments, isEmpty);
-    _assertType(dType.returnType!.type!, 'D');
-    expect(dType.returnType!.node, same(never));
-    expect(dType.positionalParameters, hasLength(1));
-    _assertType(dType.positionalParameters![0].type!, 'List');
-    expect(dType.positionalParameters![0].node,
-        TypeMatcher());
-    expect(dType.positionalParameters![0].typeArguments, hasLength(1));
-    _assertType(dType.positionalParameters![0].typeArguments[0]!.type!, 'int');
-    expect(dType.positionalParameters![0].typeArguments[0]!.node,
-        TypeMatcher());
-    expect(dType.namedParameters, isEmpty);
-  }
-
-  Future
-      test_class_alias_synthetic_constructors_with_parameters_generic() async {
-    await analyze('''
-class C {
-  C(T t);
-}
-mixin M {}
-class D = C with M;
-''');
-    var dConstructor = findElement.unnamedConstructor('D');
-    var dConstructorType = variables.decoratedElementType(dConstructor);
-    _assertType(dConstructorType.type!, 'D Function(U)');
-    expect(dConstructorType.node, same(never));
-    expect(dConstructorType.typeFormals, isEmpty);
-    _assertType(dConstructorType.returnType!.type!, 'D');
-    expect(dConstructorType.returnType!.node, same(never));
-    var typeArguments = dConstructorType.returnType!.typeArguments;
-    expect(typeArguments, hasLength(1));
-    _assertType(typeArguments[0]!.type!, 'U');
-    expect(typeArguments[0]!.node, same(never));
-    var dParams = dConstructorType.positionalParameters!;
-    expect(dParams, hasLength(1));
-    _assertType(dParams[0].type!, 'U');
-    expect(dParams[0].node, TypeMatcher());
-  }
-
-  Future test_class_with_default_constructor() async {
-    await analyze('''
-class C {}
-''');
-    var defaultConstructor = findElement.class_('C').constructors.single;
-    var decoratedConstructorType =
-        variables.decoratedElementType(defaultConstructor);
-    _assertType(decoratedConstructorType.type!, 'C Function()');
-    expect(decoratedConstructorType.node, same(never));
-    _assertType(decoratedConstructorType.returnType!.type!, 'C');
-    expect(decoratedConstructorType.returnType!.node, same(never));
-  }
-
-  Future test_class_with_default_constructor_generic() async {
-    await analyze('''
-class C {}
-''');
-    var defaultConstructor = findElement.class_('C').constructors.single;
-    var decoratedConstructorType =
-        variables.decoratedElementType(defaultConstructor);
-    _assertType(decoratedConstructorType.type!, 'C Function()');
-    expect(decoratedConstructorType.node, same(never));
-    expect(decoratedConstructorType.typeArguments, isEmpty);
-    var returnType = decoratedConstructorType.returnType!;
-    _assertType(returnType.type!, 'C');
-    expect(returnType.node, same(never));
-    expect(returnType.typeArguments, hasLength(2));
-    _assertType(returnType.typeArguments[0]!.type!, 'T');
-    expect(returnType.typeArguments[0]!.node, same(never));
-    _assertType(returnType.typeArguments[1]!.type!, 'U');
-    expect(returnType.typeArguments[1]!.node, same(never));
-  }
-
-  Future test_constructor_factory() async {
-    await analyze('''
-class C {
-  C._();
-  factory C() => C._();
-}
-''');
-    var decoratedType = decoratedConstructorDeclaration('C(').returnType!;
-    expect(decoratedType.node, same(never));
-  }
-
-  Future test_constructor_metadata() async {
-    await analyze('''
-class A {
-  final Object x;
-  const A(this.x);
-}
-class C {
-  @A([])
-  C();
-}
-''');
-    var node = decoratedTypeAnnotation('int').node;
-    expect(node, TypeMatcher());
-  }
-
-  Future test_constructor_returnType_implicit_dynamic() async {
-    await analyze('''
-class C {
-  C();
-}
-''');
-    var decoratedType = decoratedConstructorDeclaration('C(').returnType!;
-    expect(decoratedType.node, same(never));
-  }
-
-  Future test_constructorFieldInitializer_visit_expression() async {
-    await analyze('''
-class C {
-  C() : f = [];
-  Object f;
-}
-''');
-    var node = decoratedTypeAnnotation('int').node;
-    expect(node, TypeMatcher());
-  }
-
-  Future test_directSupertypes_class_extends() async {
-    await analyze('''
-class C {}
-class D extends C {}
-''');
-    var types = decoratedDirectSupertypes('D');
-    var decorated = types[findElement.class_('C')]!;
-    _assertType(decorated.type!, 'C');
-    expect(decorated.node, same(never));
-    expect(decorated.typeArguments, hasLength(2));
-    expect(decorated.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('int').node));
-    expect(decorated.typeArguments[1]!.node,
-        same(decoratedTypeAnnotation('V> {').node));
-  }
-
-  Future test_directSupertypes_class_extends_default() async {
-    await analyze('''
-class C {}
-''');
-    var types = decoratedDirectSupertypes('C');
-    var decorated = types[typeProvider.objectType.element]!;
-    _assertType(decorated.type!, 'Object');
-    assertEdge(decorated.node, never, hard: true, checkable: false);
-    expect(decorated.typeArguments, isEmpty);
-  }
-
-  Future test_directSupertypes_class_implements() async {
-    await analyze('''
-class C {}
-class D implements C {}
-''');
-    var types = decoratedDirectSupertypes('D');
-    var decorated = types[findElement.class_('C')]!;
-    _assertType(decorated.type!, 'C');
-    expect(decorated.node, same(never));
-    expect(decorated.typeArguments, hasLength(2));
-    expect(decorated.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('int').node));
-    expect(decorated.typeArguments[1]!.node,
-        same(decoratedTypeAnnotation('V> {').node));
-  }
-
-  Future test_directSupertypes_class_with() async {
-    await analyze('''
-class C {}
-class D extends Object with C {}
-''');
-    var types = decoratedDirectSupertypes('D');
-    var decorated = types[findElement.class_('C')]!;
-    _assertType(decorated.type!, 'C');
-    expect(decorated.node, same(never));
-    expect(decorated.typeArguments, hasLength(2));
-    expect(decorated.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('int').node));
-    expect(decorated.typeArguments[1]!.node,
-        same(decoratedTypeAnnotation('V> {').node));
-  }
-
-  Future test_directSupertypes_classAlias_extends() async {
-    await analyze('''
-class M {}
-class C {}
-class D = C with M;
-''');
-    var types = decoratedDirectSupertypes('D');
-    var decorated = types[findElement.class_('C')]!;
-    _assertType(decorated.type!, 'C');
-    expect(decorated.node, same(never));
-    expect(decorated.typeArguments, hasLength(2));
-    expect(decorated.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('int').node));
-    expect(decorated.typeArguments[1]!.node,
-        same(decoratedTypeAnnotation('V> w').node));
-  }
-
-  Future test_directSupertypes_classAlias_implements() async {
-    await analyze('''
-class M {}
-class C {}
-class D = Object with M implements C;
-''');
-    var types = decoratedDirectSupertypes('D');
-    var decorated = types[findElement.class_('C')]!;
-    _assertType(decorated.type!, 'C');
-    expect(decorated.node, same(never));
-    expect(decorated.typeArguments, hasLength(2));
-    expect(decorated.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('int').node));
-    expect(decorated.typeArguments[1]!.node,
-        same(decoratedTypeAnnotation('V>;').node));
-  }
-
-  Future test_directSupertypes_classAlias_with() async {
-    await analyze('''
-class C {}
-class D = Object with C;
-''');
-    var types = decoratedDirectSupertypes('D');
-    var decorated = types[findElement.class_('C')]!;
-    _assertType(decorated.type!, 'C');
-    expect(decorated.node, same(never));
-    expect(decorated.typeArguments, hasLength(2));
-    expect(decorated.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('int').node));
-    expect(decorated.typeArguments[1]!.node,
-        same(decoratedTypeAnnotation('V>;').node));
-  }
-
-  Future test_directSupertypes_dartCoreClass() async {
-    await analyze('''
-abstract class D extends Iterable {}
-''');
-    var types = decoratedDirectSupertypes('D');
-    var super_ = types.values.single!;
-    _assertType(super_.type!, 'Iterable');
-    expect(super_.node, same(never));
-    expect(super_.typeArguments, hasLength(1));
-    expect(super_.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('V> {').node));
-  }
-
-  Future test_directSupertypes_mixin_extends_default() async {
-    await analyze('''
-mixin C {}
-''');
-    var types = decoratedDirectSupertypes('C');
-    var decorated = types[typeProvider.objectType.element]!;
-    _assertType(decorated.type!, 'Object');
-    assertEdge(decorated.node, never, hard: true, checkable: false);
-    expect(decorated.typeArguments, isEmpty);
-  }
-
-  Future test_directSupertypes_mixin_implements() async {
-    await analyze('''
-class C {}
-mixin D implements C {}
-''');
-    var types = decoratedDirectSupertypes('D');
-    var decorated = types[findElement.class_('C')]!;
-    _assertType(decorated.type!, 'C');
-    expect(decorated.node, same(never));
-    expect(decorated.typeArguments, hasLength(2));
-    expect(decorated.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('int').node));
-    expect(decorated.typeArguments[1]!.node,
-        same(decoratedTypeAnnotation('V> {').node));
-  }
-
-  Future test_directSupertypes_mixin_on() async {
-    await analyze('''
-class C {}
-mixin D on C {}
-''');
-    var types = decoratedDirectSupertypes('D');
-    var decorated = types[findElement.class_('C')]!;
-    _assertType(decorated.type!, 'C');
-    expect(decorated.node, same(never));
-    expect(decorated.typeArguments, hasLength(2));
-    expect(decorated.typeArguments[0]!.node,
-        same(decoratedTypeAnnotation('int').node));
-    expect(decorated.typeArguments[1]!.node,
-        same(decoratedTypeAnnotation('V> {').node));
-  }
-
-  Future test_displayName_castType() async {
-    await analyze('f(x) => x as int;');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'cast type (test.dart:1:14)');
-  }
-
-  Future test_displayName_constructedType() async {
-    await analyze('''
-class C {
-  factory C() = D;
-}
-class D implements C {}
-''');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'type argument 0 of constructed type (test.dart:2:19)');
-  }
-
-  Future test_displayName_exceptionType_implicit() async {
-    await analyze('''
-f(void Function() g) {
-  try {
-    g();
-  } catch (e) {}
-}
-''');
-    expect(
-        variables
-            .decoratedElementType(
-                findNode.catchClauseParameter('e)').declaredElement!)
-            .node
-            .displayName,
-        'f.e (test.dart:4:5)');
-  }
-
-  Future test_displayName_exceptionType_no_variable() async {
-    await analyze('''
-f(void Function() g) {
-  try {
-    g();
-  } on String {}
-}
-''');
-    expect(decoratedTypeAnnotation('String').node.displayName,
-        'exception type (test.dart:4:8)');
-  }
-
-  Future test_displayName_exceptionType_variable() async {
-    await analyze('''
-f(void Function() g) {
-  try {
-    g();
-  } on String catch (s) {}
-}
-''');
-    expect(decoratedTypeAnnotation('String').node.displayName,
-        'f.s (test.dart:4:8)');
-  }
-
-  Future test_displayName_explicitParameterType_named() async {
-    await analyze('void f({int x, int y}) {}');
-    expect(decoratedTypeAnnotation('int x').node.displayName,
-        'parameter x of f (test.dart:1:9)');
-    expect(decoratedTypeAnnotation('int y').node.displayName,
-        'parameter y of f (test.dart:1:16)');
-  }
-
-  Future test_displayName_explicitParameterType_positional() async {
-    await analyze('void f(int x, int y, [int z]) {}');
-    expect(decoratedTypeAnnotation('int x').node.displayName,
-        'parameter 0 of f (test.dart:1:8)');
-    expect(decoratedTypeAnnotation('int y').node.displayName,
-        'parameter 1 of f (test.dart:1:15)');
-    expect(decoratedTypeAnnotation('int z').node.displayName,
-        'parameter 2 of f (test.dart:1:23)');
-  }
-
-  Future test_displayName_extendedType() async {
-    await analyze('extension E on int {}');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'extended type (test.dart:1:16)');
-  }
-
-  Future test_displayName_field() async {
-    await analyze('class C { int x; }');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'C.x (test.dart:1:11)');
-  }
-
-  Future test_displayName_for_loop_variable() async {
-    await analyze('f(List x) { for (int y in x) {} }');
-    expect(decoratedTypeAnnotation('int y').node.displayName,
-        'f.y (test.dart:1:23)');
-  }
-
-  Future
-      test_displayName_functionExpressionInvocation_type_argument() async {
-    await analyze('f(g) => g();');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'type argument (test.dart:1:11)');
-  }
-
-  Future test_displayName_listElementType() async {
-    await analyze('f() => [];');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'list element type (test.dart:1:9)');
-  }
-
-  Future test_displayName_mapKeyType() async {
-    await analyze('f() => {};');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'map key type (test.dart:1:9)');
-  }
-
-  Future test_displayName_mapValueType() async {
-    await analyze('f() => {};');
-    expect(decoratedTypeAnnotation('String').node.displayName,
-        'map value type (test.dart:1:14)');
-  }
-
-  Future test_displayName_methodInvocation_type_argument() async {
-    await analyze('f(x) => x.g();');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'type argument (test.dart:1:13)');
-  }
-
-  Future test_displayName_setElementType() async {
-    await analyze('f() => {};');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'set element type (test.dart:1:9)');
-  }
-
-  Future test_displayName_supertype() async {
-    await analyze('''
-class C {}
-class D extends C {}
-''');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'type argument 0 of supertype of D (test.dart:2:19)');
-  }
-
-  Future test_displayName_testedType() async {
-    await analyze('f(x) => x is int;');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'tested type (test.dart:1:14)');
-  }
-
-  Future test_displayName_typeArgument() async {
-    await analyze('var x = >[];');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'type argument 0 of list element type (test.dart:1:15)');
-  }
-
-  Future test_displayName_typedef_new_parameter() async {
-    await analyze('typedef F = void Function(int x);');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'parameter 0 of F (test.dart:1:27)');
-  }
-
-  Future test_displayName_typedef_new_returnType() async {
-    await analyze('typedef F = int Function();');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'return type of F (test.dart:1:13)');
-  }
-
-  Future test_displayName_typedef_old_parameter() async {
-    await analyze('typedef void F(int x);');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'parameter 0 of F (test.dart:1:16)');
-  }
-
-  Future test_displayName_typedef_old_returnType() async {
-    await analyze('typedef int F();');
-    expect(decoratedTypeAnnotation('int').node.displayName,
-        'return type of F (test.dart:1:9)');
-  }
-
-  Future test_displayName_typeParameterBound() async {
-    await analyze('class C {}');
-    expect(decoratedTypeAnnotation('num').node.displayName,
-        'bound of C.T (test.dart:1:19)');
-  }
-
-  Future test_displayName_typeParameterBound_implicit() async {
-    await analyze('class C {}');
-    expect(
-        variables
-            .decoratedTypeParameterBound(
-                findElement.class_('C').typeParameters[0])!
-            .node
-            .displayName,
-        'bound of C.T (test.dart:1:19)');
-  }
-
-  Future test_displayName_variable_local() async {
-    await analyze('f() { int x; }');
-    expect(
-        decoratedTypeAnnotation('int').node.displayName, 'f.x (test.dart:1:7)');
-  }
-
-  Future test_displayName_variable_top_level() async {
-    await analyze('int x;');
-    expect(
-        decoratedTypeAnnotation('int').node.displayName, 'x (test.dart:1:1)');
-  }
-
-  Future test_dynamic_type() async {
-    await analyze('''
-dynamic f() {}
-''');
-    var decoratedType = decoratedTypeAnnotation('dynamic');
-    expect(decoratedFunctionType('f').returnType, same(decoratedType));
-    assertNoEdge(always, decoratedType.node);
-  }
-
-  Future test_extended_type_no_add_hint_actions() async {
-    await analyze('''
-class A extends Object {}
-''');
-    final node = decoratedTypeAnnotation('Object').node;
-    expect(node.hintActions, isEmpty);
-  }
-
-  Future test_field_type_implicit_dynamic() async {
-    await analyze('''
-class C {
-  var x;
-}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_field_type_inferred() async {
-    await analyze('''
-class C {
-  var x = 1;
-}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node, TypeMatcher());
-  }
-
-  Future test_field_type_inferred_dynamic() async {
-    await analyze('''
-dynamic f() {}
-class C {
-  var x = f();
-}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_field_type_simple() async {
-    await analyze('''
-class C {
-  int f = 0;
-}
-''');
-    var decoratedType = decoratedTypeAnnotation('int');
-    expect(decoratedType.node, TypeMatcher());
-    expect(
-        variables.decoratedElementType(findNode
-            .fieldDeclaration('f')
-            .fields
-            .variables[0]
-            .declaredElement!),
-        same(decoratedType));
-  }
-
-  Future test_fieldFormalParameter_function_namedParameter_typed() async {
-    await analyze('''
-class C {
-  Object f;
-  C(void this.f({int i}));
-}
-''');
-    var ctor = findElement.unnamedConstructor('C');
-    var ctorParam = ctor.parameters[0];
-    var ctorType = variables.decoratedElementType(ctor);
-    var ctorParamType = variables.decoratedElementType(ctorParam);
-    expect(ctorType.positionalParameters![0], same(ctorParamType));
-    expect(ctorParamType.node, TypeMatcher());
-    expect(ctorParamType.namedParameters!['i'],
-        same(decoratedTypeAnnotation('int')));
-  }
-
-  Future
-      test_fieldFormalParameter_function_namedParameter_untyped() async {
-    await analyze('''
-class C {
-  Object f;
-  C(void this.f({i}));
-}
-''');
-    var ctor = findElement.unnamedConstructor('C');
-    var ctorParam = ctor.parameters[0];
-    var ctorType = variables.decoratedElementType(ctor);
-    var ctorParamType = variables.decoratedElementType(ctorParam);
-    expect(ctorType.positionalParameters![0], same(ctorParamType));
-    expect(ctorParamType.node, TypeMatcher());
-    _assertType(ctorParamType.namedParameters!['i']!.type!, 'dynamic');
-    expect(ctorParamType.namedParameters!['i']!.node.isImmutable, false);
-  }
-
-  Future
-      test_fieldFormalParameter_function_positionalParameter_typed() async {
-    await analyze('''
-class C {
-  Object f;
-  C(void this.f(int i));
-}
-''');
-    var ctor = findElement.unnamedConstructor('C');
-    var ctorParam = ctor.parameters[0];
-    var ctorType = variables.decoratedElementType(ctor);
-    var ctorParamType = variables.decoratedElementType(ctorParam);
-    expect(ctorType.positionalParameters![0], same(ctorParamType));
-    expect(ctorParamType.node, TypeMatcher());
-    expect(ctorParamType.positionalParameters![0],
-        same(decoratedTypeAnnotation('int')));
-  }
-
-  Future
-      test_fieldFormalParameter_function_positionalParameter_untyped() async {
-    await analyze('''
-class C {
-  Object f;
-  C(void this.f(i));
-}
-''');
-    var ctor = findElement.unnamedConstructor('C');
-    var ctorParam = ctor.parameters[0];
-    var ctorType = variables.decoratedElementType(ctor);
-    var ctorParamType = variables.decoratedElementType(ctorParam);
-    expect(ctorType.positionalParameters![0], same(ctorParamType));
-    expect(ctorParamType.node, TypeMatcher());
-    _assertType(ctorParamType.positionalParameters![0].type!, 'dynamic');
-    expect(ctorParamType.positionalParameters![0].node.isImmutable, false);
-  }
-
-  Future test_fieldFormalParameter_function_return_typed() async {
-    await analyze('''
-class C {
-  Object f;
-  C(int this.f());
-}
-''');
-    var ctor = findElement.unnamedConstructor('C');
-    var ctorParam = ctor.parameters[0];
-    var ctorType = variables.decoratedElementType(ctor);
-    var ctorParamType = variables.decoratedElementType(ctorParam);
-    expect(ctorType.positionalParameters![0], same(ctorParamType));
-    expect(ctorParamType.node, TypeMatcher());
-    expect(ctorParamType.returnType, same(decoratedTypeAnnotation('int')));
-  }
-
-  Future test_fieldFormalParameter_function_return_untyped() async {
-    await analyze('''
-class C {
-  Object f;
-  C(this.f()) {}
-}
-''');
-    var ctor = findElement.unnamedConstructor('C');
-    var ctorParam = ctor.parameters[0];
-    var ctorType = variables.decoratedElementType(ctor);
-    var ctorParamType = variables.decoratedElementType(ctorParam);
-    expect(ctorType.positionalParameters![0], same(ctorParamType));
-    expect(ctorParamType.node, TypeMatcher());
-    _assertType(ctorParamType.returnType!.type!, 'dynamic');
-    expect(ctorParamType.returnType!.node.isImmutable, false);
-  }
-
-  Future
-      test_fieldFormalParameter_named_no_default_required_hint() async {
-    await analyze('''
-class C {
-  String s;
-  C({/*required*/ this.s});
-}
-''');
-    expect(
-        variables.getRequiredHint(
-            testSource, findNode.fieldFormalParameter('this.s')),
-        isNotNull);
-  }
-
-  Future
-      test_fieldFormalParameter_named_no_default_required_hint_annotation() async {
-    await analyze('''
-class C {
-  String s;
-  C({@deprecated /*required*/ this.s});
-}
-''');
-    expect(
-        variables.getRequiredHint(
-            testSource, findNode.fieldFormalParameter('this.s')),
-        isNotNull);
-  }
-
-  Future
-      test_fieldFormalParameter_named_no_default_required_hint_function_typed() async {
-    await analyze('''
-class C {
-  String Function() s;
-  C({/*required*/ String this.s()});
-}
-''');
-    expect(
-        variables.getRequiredHint(
-            testSource, findNode.fieldFormalParameter('this.s')),
-        isNotNull);
-  }
-
-  Future
-      test_fieldFormalParameter_named_no_default_required_hint_type() async {
-    await analyze('''
-class C {
-  String s;
-  C({/*required*/ String this.s});
-}
-''');
-    expect(
-        variables.getRequiredHint(
-            testSource, findNode.fieldFormalParameter('this.s')),
-        isNotNull);
-  }
-
-  Future test_fieldFormalParameter_typed() async {
-    await analyze('''
-class C {
-  int i;
-  C.named(int this.i);
-}
-''');
-    var decoratedConstructorParamType =
-        decoratedConstructorDeclaration('named').positionalParameters![0];
-    expect(decoratedTypeAnnotation('int this'),
-        same(decoratedConstructorParamType));
-    _assertType(decoratedConstructorParamType.type!, 'int');
-    expect(decoratedConstructorParamType.node,
-        TypeMatcher());
-    // Note: the edge builder will connect this node to the node for the type of
-    // the field.
-  }
-
-  Future test_fieldFormalParameter_untyped() async {
-    await analyze('''
-class C {
-  int i;
-  C.named(this.i);
-}
-''');
-    var decoratedConstructorParamType =
-        decoratedConstructorDeclaration('named').positionalParameters![0];
-    _assertType(decoratedConstructorParamType.type!, 'int');
-    expect(decoratedConstructorParamType.node,
-        TypeMatcher());
-    // Note: the edge builder will unify this implicit type with the type of the
-    // field.
-  }
-
-  Future test_formalParameter_named_no_default_required_hint() async {
-    await analyze('''
-void f({/*required*/ String s}) {}
-''');
-    expect(variables.getRequiredHint(testSource, findNode.simpleParameter('s')),
-        isNotNull);
-  }
-
-  Future
-      test_formalParameter_named_no_default_required_hint_annotation() async {
-    await analyze('''
-void f({@deprecated /*required*/ String s}) {}
-''');
-    expect(variables.getRequiredHint(testSource, findNode.simpleParameter('s')),
-        isNotNull);
-  }
-
-  Future
-      test_formalParameter_named_no_default_required_hint_covariant() async {
-    await analyze('''
-class C {
-  void f({/*required*/ covariant String s}) {}
-}
-''');
-    expect(
-        variables.getRequiredHint(
-            testSource, findNode.simpleParameter('String s')),
-        isNotNull);
-  }
-
-  Future
-      test_formalParameter_named_no_default_required_hint_final_type() async {
-    await analyze('''
-void f({/*required*/ final String s}) {}
-''');
-    expect(variables.getRequiredHint(testSource, findNode.simpleParameter('s')),
-        isNotNull);
-  }
-
-  Future
-      test_formalParameter_named_no_default_required_hint_no_type() async {
-    await analyze('''
-void f({/*required*/ s}) {}
-''');
-    expect(variables.getRequiredHint(testSource, findNode.simpleParameter('s')),
-        isNotNull);
-  }
-
-  Future test_formalParameter_named_no_default_required_hint_var() async {
-    await analyze('''
-void f({/*required*/ var s}) {}
-''');
-    expect(variables.getRequiredHint(testSource, findNode.simpleParameter('s')),
-        isNotNull);
-  }
-
-  Future test_function_explicit_returnType() async {
-    await analyze('''
-class C {
-  int f() => null;
-}
-''');
-    var decoratedType = decoratedTypeAnnotation('int');
-    expect(
-        decoratedType.node.displayName, 'return type of C.f (test.dart:2:3)');
-  }
-
-  Future test_function_generic_bounded() async {
-    await analyze('''
-T f(T t) => t;
-''');
-    var bound = decoratedTypeParameterBound('T extends')!;
-    expect(decoratedTypeAnnotation('Object'), same(bound));
-    expect(bound.node, isNot(always));
-    expect(bound.type, typeProvider.objectType);
-  }
-
-  Future test_function_generic_implicit_bound() async {
-    await analyze('''
-T f(T t) => t;
-''');
-    var bound = decoratedTypeParameterBound('T>')!;
-    assertEdge(always, bound.node, hard: false);
-    expect(bound.type, same(typeProvider.objectType));
-  }
-
-  Future test_function_metadata() async {
-    await analyze('''
-class A {
-  final Object x;
-  const A(this.x);
-}
-@A([])
-f() {}
-''');
-    var node = decoratedTypeAnnotation('int').node;
-    expect(node, TypeMatcher());
-  }
-
-  Future test_functionExpression() async {
-    await analyze('''
-void f() {
-  var x = (int i) => 1;
-}
-''');
-    var functionExpressionElement =
-        findNode.simpleParameter('int i').declaredElement!.enclosingElement!;
-    var decoratedType =
-        variables.decoratedElementType(functionExpressionElement);
-    expect(decoratedType.positionalParameters![0],
-        same(decoratedTypeAnnotation('int i')));
-    expect(decoratedType.node, same(never));
-    expect(
-        decoratedType.returnType!.node, TypeMatcher());
-  }
-
-  Future test_functionExpression_returns_bottom() async {
-    await analyze('''
-void f() {
-  var x = (int i) => throw 'foo';
-}
-''');
-    var functionExpressionElement =
-        findNode.simpleParameter('int i').declaredElement!.enclosingElement!;
-    var decoratedType =
-        variables.decoratedElementType(functionExpressionElement);
-    expect(
-        decoratedType.returnType!.node, TypeMatcher());
-  }
-
-  Future test_functionTypeAlias_generic() async {
-    await analyze('''
-typedef T F(U u);
-''');
-    var element = findElement.typeAlias('F');
-    var decoratedType = variables.decoratedElementType(element.aliasedElement!);
-    var t = element.typeParameters[0];
-    var u = element.typeParameters[1];
-    // typeFormals should be empty because this is not a generic function type,
-    // it's a generic typedef that defines an ordinary (non-generic) function
-    // type.
-    expect(decoratedType.typeFormals, isEmpty);
-    expect(decoratedType.returnType, same(decoratedTypeAnnotation('T F')));
-    expect(
-        (decoratedType.returnType!.type as TypeParameterType).element, same(t));
-    expect(
-        decoratedType.returnType!.node, TypeMatcher());
-    expect(
-        (decoratedType.positionalParameters![0].type as TypeParameterType)
-            .element,
-        same(u));
-    expect(decoratedType.positionalParameters![0].node,
-        TypeMatcher());
-  }
-
-  Future test_functionTypeAlias_implicit_return_type() async {
-    await analyze('''
-typedef F();
-''');
-    var decoratedType = variables
-        .decoratedElementType(findElement.typeAlias('F').aliasedElement!);
-    expect(decoratedType.returnType!.type is DynamicType, isTrue);
-    expect(decoratedType.returnType!.node.isImmutable, false);
-    expect(decoratedType.typeFormals, isEmpty);
-  }
-
-  Future test_functionTypeAlias_simple() async {
-    await analyze('''
-typedef int F(String s);
-''');
-    var decoratedType = variables
-        .decoratedElementType(findElement.typeAlias('F').aliasedElement!);
-    expect(decoratedType.returnType, same(decoratedTypeAnnotation('int')));
-    expect(decoratedType.typeFormals, isEmpty);
-    expect(decoratedType.positionalParameters![0],
-        same(decoratedTypeAnnotation('String')));
-  }
-
-  Future
-      test_functionTypedFormalParameter_named_no_default_required_hint() async {
-    await analyze('''
-void f({/*required*/ void s()}) {}
-''');
-    expect(
-        variables.getRequiredHint(
-            testSource, findNode.functionTypedFormalParameter('s')),
-        isNotNull);
-  }
-
-  Future
-      test_functionTypedFormalParameter_named_no_default_required_hint_no_return() async {
-    await analyze('''
-void f({/*required*/ s()}) {}
-''');
-    expect(
-        variables.getRequiredHint(
-            testSource, findNode.functionTypedFormalParameter('s')),
-        isNotNull);
-  }
-
-  Future test_functionTypedFormalParameter_namedParameter_typed() async {
-    await analyze('''
-void f(void g({int i})) {}
-''');
-    var f = findElement.function('f');
-    var g = f.parameters[0];
-    var fType = variables.decoratedElementType(f);
-    var gType = variables.decoratedElementType(g);
-    expect(fType.positionalParameters![0], same(gType));
-    expect(gType.node, TypeMatcher());
-    expect(gType.namedParameters!['i'], same(decoratedTypeAnnotation('int')));
-  }
-
-  Future
-      test_functionTypedFormalParameter_namedParameter_untyped() async {
-    await analyze('''
-void f(void g({i})) {}
-''');
-    var f = findElement.function('f');
-    var g = f.parameters[0];
-    var fType = variables.decoratedElementType(f);
-    var gType = variables.decoratedElementType(g);
-    expect(fType.positionalParameters![0], same(gType));
-    expect(gType.node, TypeMatcher());
-    _assertType(gType.namedParameters!['i']!.type!, 'dynamic');
-    expect(gType.namedParameters!['i']!.node.isImmutable, false);
-  }
-
-  Future
-      test_functionTypedFormalParameter_positionalParameter_typed() async {
-    await analyze('''
-void f(void g(int i)) {}
-''');
-    var f = findElement.function('f');
-    var g = f.parameters[0];
-    var fType = variables.decoratedElementType(f);
-    var gType = variables.decoratedElementType(g);
-    expect(fType.positionalParameters![0], same(gType));
-    expect(gType.node, TypeMatcher());
-    expect(
-        gType.positionalParameters![0], same(decoratedTypeAnnotation('int')));
-  }
-
-  Future
-      test_functionTypedFormalParameter_positionalParameter_untyped() async {
-    await analyze('''
-void f(void g(i)) {}
-''');
-    var f = findElement.function('f');
-    var g = f.parameters[0];
-    var fType = variables.decoratedElementType(f);
-    var gType = variables.decoratedElementType(g);
-    expect(fType.positionalParameters![0], same(gType));
-    expect(gType.node, TypeMatcher());
-    _assertType(gType.positionalParameters![0].type!, 'dynamic');
-    expect(gType.positionalParameters![0].node.isImmutable, false);
-  }
-
-  Future test_functionTypedFormalParameter_return_typed() async {
-    await analyze('''
-void f(int g()) {}
-''');
-    var f = findElement.function('f');
-    var g = f.parameters[0];
-    var fType = variables.decoratedElementType(f);
-    var gType = variables.decoratedElementType(g);
-    expect(fType.positionalParameters![0], same(gType));
-    expect(gType.node, TypeMatcher());
-    expect(gType.returnType, same(decoratedTypeAnnotation('int')));
-  }
-
-  Future test_functionTypedFormalParameter_return_untyped() async {
-    await analyze('''
-void f(g()) {}
-''');
-    var f = findElement.function('f');
-    var g = f.parameters[0];
-    var fType = variables.decoratedElementType(f);
-    var gType = variables.decoratedElementType(g);
-    expect(fType.positionalParameters![0], same(gType));
-    expect(gType.node, TypeMatcher());
-    _assertType(gType.returnType!.type!, 'dynamic');
-    expect(gType.returnType!.node.isImmutable, false);
-  }
-
-  Future test_genericFunctionType_formals() async {
-    await analyze('''
-void f(T Function(U) x) {}
-''');
-    var decoratedType = decoratedGenericFunctionTypeAnnotation('T Function');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedType));
-    expect(decoratedType.node, TypeMatcher());
-    _assertType(decoratedType.type!, 'T Function(U)');
-    expect(decoratedType.typeFormals, hasLength(2));
-    var t = decoratedType.typeFormals![0];
-    var u = decoratedType.typeFormals![1];
-    expect(
-        (decoratedType.returnType!.type as TypeParameterType).element, same(t));
-    expect(
-        (decoratedType.positionalParameters![0].type as TypeParameterType)
-            .element,
-        same(u));
-  }
-
-  Future test_genericFunctionType_namedParameterType() async {
-    await analyze('''
-void f(void Function({int y}) x) {}
-''');
-    var decoratedType =
-        decoratedGenericFunctionTypeAnnotation('void Function({int y})');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedType));
-    expect(decoratedType.node, TypeMatcher());
-    var decoratedIntType = decoratedTypeAnnotation('int');
-    expect(decoratedType.namedParameters!['y'], same(decoratedIntType));
-    expect(decoratedIntType.node, isNotNull);
-    expect(decoratedIntType.node, isNot(never));
-  }
-
-  Future test_genericFunctionType_returnType() async {
-    await analyze('''
-void f(int Function() x) {}
-''');
-    var decoratedType =
-        decoratedGenericFunctionTypeAnnotation('int Function()');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedType));
-    expect(decoratedType.node, TypeMatcher());
-    var decoratedIntType = decoratedTypeAnnotation('int');
-    expect(decoratedType.returnType, same(decoratedIntType));
-    expect(decoratedIntType.node, isNotNull);
-    expect(decoratedIntType.node, isNot(never));
-    expect(decoratedType.returnType!.node.displayName,
-        'return type of parameter 0 of f (test.dart:1:8)');
-  }
-
-  Future test_genericFunctionType_syntax_inferred_dynamic_return() async {
-    await analyze('''
-abstract class C {
-  Function() f();
-}
-''');
-    var decoratedFType = decoratedMethodType('f');
-    var decoratedFReturnType = decoratedFType.returnType!;
-    var decoratedFReturnReturnType = decoratedFReturnType.returnType!;
-    _assertType(decoratedFReturnReturnType.type!, 'dynamic');
-    expect(decoratedFReturnReturnType.node.isImmutable, false);
-  }
-
-  Future test_genericFunctionType_unnamedParameterType() async {
-    await analyze('''
-void f(void Function(int) x) {}
-''');
-    var decoratedType =
-        decoratedGenericFunctionTypeAnnotation('void Function(int)');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedType));
-    expect(decoratedType.node, TypeMatcher());
-    var decoratedIntType = decoratedTypeAnnotation('int');
-    expect(decoratedType.positionalParameters![0], same(decoratedIntType));
-    expect(decoratedIntType.node, isNotNull);
-    expect(decoratedIntType.node, isNot(never));
-  }
-
-  Future test_genericTypeAlias_generic_inner() async {
-    await analyze('''
-typedef F = T Function(U u);
-''');
-    var element = findElement.typeAlias('F');
-    var decoratedType = variables.decoratedElementType(element.aliasedElement!);
-    expect(decoratedType,
-        same(decoratedGenericFunctionTypeAnnotation('T Function')));
-    expect(decoratedType.typeFormals, hasLength(2));
-    var t = decoratedType.typeFormals![0];
-    var u = decoratedType.typeFormals![1];
-    expect(decoratedType.returnType, same(decoratedTypeAnnotation('T F')));
-    expect(
-        (decoratedType.returnType!.type as TypeParameterType).element, same(t));
-    expect(
-        decoratedType.returnType!.node, TypeMatcher());
-    expect(
-        (decoratedType.positionalParameters![0].type as TypeParameterType)
-            .element,
-        same(u));
-    expect(decoratedType.positionalParameters![0].node,
-        TypeMatcher());
-  }
-
-  Future test_genericTypeAlias_generic_outer() async {
-    await analyze('''
-typedef F = T Function(U u);
-''');
-    var element = findElement.typeAlias('F');
-    var decoratedType = variables.decoratedElementType(element.aliasedElement!);
-    expect(decoratedType,
-        same(decoratedGenericFunctionTypeAnnotation('T Function')));
-    var t = element.typeParameters[0];
-    var u = element.typeParameters[1];
-    // typeFormals should be empty because this is not a generic function type,
-    // it's a generic typedef that defines an ordinary (non-generic) function
-    // type.
-    expect(decoratedType.typeFormals, isEmpty);
-    expect(decoratedType.returnType, same(decoratedTypeAnnotation('T F')));
-    expect(
-        (decoratedType.returnType!.type as TypeParameterType).element, same(t));
-    expect(
-        decoratedType.returnType!.node, TypeMatcher());
-    expect(
-        (decoratedType.positionalParameters![0].type as TypeParameterType)
-            .element,
-        same(u));
-    expect(decoratedType.positionalParameters![0].node,
-        TypeMatcher());
-  }
-
-  Future test_genericTypeAlias_implicit_return_type() async {
-    await analyze('''
-typedef F = Function();
-''');
-    var decoratedType = variables
-        .decoratedElementType(findElement.typeAlias('F').aliasedElement!);
-    expect(decoratedType,
-        same(decoratedGenericFunctionTypeAnnotation('Function')));
-    expect(decoratedType.returnType!.type is DynamicType, isTrue);
-    expect(decoratedType.returnType!.node.isImmutable, false);
-    expect(decoratedType.typeFormals, isEmpty);
-  }
-
-  Future test_genericTypeAlias_simple() async {
-    await analyze('''
-typedef F = int Function(String s);
-''');
-    var decoratedType = variables
-        .decoratedElementType(findElement.typeAlias('F').aliasedElement!);
-    expect(decoratedType,
-        same(decoratedGenericFunctionTypeAnnotation('int Function')));
-    expect(decoratedType.returnType, same(decoratedTypeAnnotation('int')));
-    expect(decoratedType.typeFormals, isEmpty);
-    expect(decoratedType.positionalParameters![0],
-        same(decoratedTypeAnnotation('String')));
-    expect(decoratedType.returnType!.node.displayName,
-        'return type of F (test.dart:1:13)');
-  }
-
-  Future test_implicit_type_nested_no_add_hint_actions() async {
-    await analyze('''
-var x = [1];
-''');
-    final node = variables
-        .decoratedElementType(findNode
-            .topLevelVariableDeclaration('x')
-            .variables
-            .variables[0]
-            .declaredElement!)
-        .typeArguments[0]!
-        .node;
-    expect(node.hintActions, isEmpty);
-  }
-
-  Future test_implicit_type_no_add_hint_actions() async {
-    await analyze('''
-var x = 1;
-''');
-    final node = variables
-        .decoratedElementType(findNode
-            .topLevelVariableDeclaration('x')
-            .variables
-            .variables[0]
-            .declaredElement!)
-        .node;
-    expect(node.hintActions, isEmpty);
-  }
-
-  Future test_interfaceType_generic_instantiate_to_dynamic() async {
-    await analyze('''
-void f(List x) {}
-''');
-    var decoratedListType = decoratedTypeAnnotation('List');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedListType));
-    expect(decoratedListType.node, isNotNull);
-    expect(decoratedListType.node, isNot(never));
-    var decoratedArgType = decoratedListType.typeArguments[0]!;
-    expect(decoratedArgType.node.isImmutable, false);
-  }
-
-  Future test_interfaceType_generic_instantiate_to_function_type() async {
-    await analyze('''
-class C {}
-void f(C x) {}
-''');
-    var decoratedCType = decoratedTypeAnnotation('C x');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedCType));
-    expect(decoratedCType.node, TypeMatcher());
-    expect(decoratedCType.typeArguments, hasLength(1));
-    var decoratedArgType = decoratedCType.typeArguments[0]!;
-    expect(decoratedArgType.node, TypeMatcher());
-    expect(decoratedArgType.typeArguments, isEmpty);
-    var decoratedArgReturnType = decoratedArgType.returnType!;
-    expect(decoratedArgReturnType.node, TypeMatcher());
-    expect(decoratedArgReturnType.typeArguments, isEmpty);
-  }
-
-  Future
-      test_interfaceType_generic_instantiate_to_function_type_void() async {
-    await analyze('''
-class C {}
-void f(C x) {}
-''');
-    var decoratedCType = decoratedTypeAnnotation('C x');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedCType));
-    expect(decoratedCType.node, TypeMatcher());
-    expect(decoratedCType.typeArguments, hasLength(1));
-    var decoratedArgType = decoratedCType.typeArguments[0]!;
-    expect(decoratedArgType.node, TypeMatcher());
-    expect(decoratedArgType.typeArguments, isEmpty);
-    var decoratedArgReturnType = decoratedArgType.returnType!;
-    expect(decoratedArgReturnType.node.isImmutable, false);
-    expect(decoratedArgReturnType.typeArguments, isEmpty);
-  }
-
-  Future test_interfaceType_generic_instantiate_to_generic_type() async {
-    await analyze('''
-class C {}
-class D> {}
-void f(D x) {}
-''');
-    var decoratedDType = decoratedTypeAnnotation('D x');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedDType));
-    expect(decoratedDType.node, TypeMatcher());
-    expect(decoratedDType.typeArguments, hasLength(1));
-    var decoratedArgType = decoratedDType.typeArguments[0]!;
-    expect(decoratedArgType.node, TypeMatcher());
-    expect(decoratedArgType.typeArguments, hasLength(1));
-    var decoratedArgArgType = decoratedArgType.typeArguments[0]!;
-    expect(decoratedArgArgType.node, TypeMatcher());
-    expect(decoratedArgArgType.typeArguments, isEmpty);
-  }
-
-  Future
-      test_interfaceType_generic_instantiate_to_generic_type_2() async {
-    await analyze('''
-class C {}
-class D, U extends C> {}
-void f(D x) {}
-''');
-    var decoratedDType = decoratedTypeAnnotation('D x');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedDType));
-    expect(decoratedDType.node, TypeMatcher());
-    expect(decoratedDType.typeArguments, hasLength(2));
-    var decoratedArg0Type = decoratedDType.typeArguments[0]!;
-    expect(decoratedArg0Type.node, TypeMatcher());
-    expect(decoratedArg0Type.typeArguments, hasLength(2));
-    var decoratedArg0Arg0Type = decoratedArg0Type.typeArguments[0]!;
-    expect(decoratedArg0Arg0Type.node, TypeMatcher());
-    expect(decoratedArg0Arg0Type.typeArguments, isEmpty);
-    var decoratedArg0Arg1Type = decoratedArg0Type.typeArguments[1]!;
-    expect(decoratedArg0Arg1Type.node, TypeMatcher());
-    expect(decoratedArg0Arg1Type.typeArguments, isEmpty);
-    var decoratedArg1Type = decoratedDType.typeArguments[1]!;
-    expect(decoratedArg1Type.node, TypeMatcher());
-    expect(decoratedArg1Type.typeArguments, hasLength(2));
-    var decoratedArg1Arg0Type = decoratedArg1Type.typeArguments[0]!;
-    expect(decoratedArg1Arg0Type.node, TypeMatcher());
-    expect(decoratedArg1Arg0Type.typeArguments, isEmpty);
-    var decoratedArg1Arg1Type = decoratedArg1Type.typeArguments[1]!;
-    expect(decoratedArg1Arg1Type.node, TypeMatcher());
-    expect(decoratedArg1Arg1Type.typeArguments, isEmpty);
-  }
-
-  Future test_interfaceType_generic_instantiate_to_object() async {
-    await analyze('''
-class C {}
-void f(C x) {}
-''');
-    var decoratedListType = decoratedTypeAnnotation('C x');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedListType));
-    expect(decoratedListType.node, TypeMatcher());
-    expect(decoratedListType.typeArguments, hasLength(1));
-    var decoratedArgType = decoratedListType.typeArguments[0]!;
-    expect(decoratedArgType.node, TypeMatcher());
-    expect(decoratedArgType.typeArguments, isEmpty);
-  }
-
-  Future test_interfaceType_typeParameter() async {
-    await analyze('''
-void f(List x) {}
-''');
-    var decoratedListType = decoratedTypeAnnotation('List');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedListType));
-    expect(decoratedListType.node, isNotNull);
-    expect(decoratedListType.node, isNot(never));
-    var decoratedIntType = decoratedTypeAnnotation('int');
-    expect(decoratedListType.typeArguments[0], same(decoratedIntType));
-    expect(decoratedIntType.node, isNotNull);
-    expect(decoratedIntType.node, isNot(never));
-  }
-
-  Future test_local_function() async {
-    await analyze('''
-void f() {
-  int g(int i) => 1;
-}
-''');
-    var decoratedType = decoratedFunctionType('g');
-    expect(decoratedType.returnType, same(decoratedTypeAnnotation('int g')));
-    expect(decoratedType.positionalParameters![0],
-        same(decoratedTypeAnnotation('int i')));
-    expect(decoratedType.node, same(never));
-  }
-
-  Future test_localVariable_type_implicit_dynamic() async {
-    await analyze('''
-main() {
-  var x;
-}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_localVariable_type_inferred() async {
-    await analyze('''
-main() {
-  var x = 1;
-}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node, TypeMatcher());
-  }
-
-  Future test_localVariable_type_inferred_dynamic() async {
-    await analyze('''
-dynamic f() {}
-main() {
-  var x = f();
-}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_localVariable_type_inferred_function() async {
-    await analyze('''
-main() {
-  var x = () => 1;
-}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.returnType!.node.displayName,
-        'return type of main.x (test.dart:2:7)');
-  }
-
-  Future test_localVariable_type_inferred_generic() async {
-    await analyze('''
-main() {
-  var x = {1: 2};
-}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.typeArguments[0]!.node.displayName,
-        'type argument 0 of main.x (test.dart:2:7)');
-    expect(decoratedType.typeArguments[1]!.node.displayName,
-        'type argument 1 of main.x (test.dart:2:7)');
-  }
-
-  Future test_method_generic_bounded() async {
-    await analyze('''
-class C {
-  T f(T t) => t;
-}
-''');
-    var bound = decoratedTypeParameterBound('T extends')!;
-    expect(decoratedTypeAnnotation('Object'), same(bound));
-    expect(bound.node, isNot(always));
-    expect(bound.type, typeProvider.objectType);
-  }
-
-  Future test_method_generic_implicit_bound() async {
-    await analyze('''
-class C {
-  T f(T t) => t;
-}
-''');
-    var bound = decoratedTypeParameterBound('T>')!;
-    assertEdge(always, bound.node, hard: false);
-    expect(bound.type, same(typeProvider.objectType));
-  }
-
-  Future test_method_metadata() async {
-    await analyze('''
-class A {
-  final Object x;
-  const A(this.x);
-}
-class C {
-  @A([])
-  f() {}
-}
-''');
-    var node = decoratedTypeAnnotation('int').node;
-    expect(node, TypeMatcher());
-  }
-
-  Future test_method_parameterType_implicit_dynamic() async {
-    await analyze('''
-class C {
-  void f(x) {}
-}
-''');
-    var decoratedType = decoratedMethodType('f').positionalParameters![0];
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_method_parameterType_implicit_dynamic_named() async {
-    await analyze('''
-class C {
-  void f({x}) {}
-}
-''');
-    var decoratedType = decoratedMethodType('f').namedParameters!['x']!;
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_method_parameterType_inferred() async {
-    await analyze('''
-class B {
-  void f(int x) {}
-}
-class C extends B {
-  void f/*C*/(x) {}
-}
-''');
-    var decoratedType = decoratedMethodType('f/*C*/').positionalParameters![0];
-    expect(decoratedType.node, TypeMatcher());
-  }
-
-  Future test_method_parameterType_inferred_dynamic() async {
-    await analyze('''
-class B {
-  void f(dynamic x) {}
-}
-class C extends B {
-  void f/*C*/(x) {}
-}
-''');
-    var decoratedType = decoratedMethodType('f/*C*/').positionalParameters![0];
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_method_parameterType_inferred_dynamic_named() async {
-    await analyze('''
-class B {
-  void f({dynamic x = 0}) {}
-}
-class C extends B {
-  void f/*C*/({x = 0}) {}
-}
-''');
-    var decoratedType = decoratedMethodType('f/*C*/').namedParameters!['x']!;
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future
-      test_method_parameterType_inferred_generic_function_typed_no_bound() async {
-    await analyze('''
-class B {
-  void f/*B*/(T Function() x) {}
-}
-class C extends B {
-  void f/*C*/(x) {}
-}
-''');
-    var decoratedBaseType =
-        decoratedMethodType('f/*B*/').positionalParameters![0];
-    var decoratedType = decoratedMethodType('f/*C*/').positionalParameters![0];
-    var decoratedTypeFormalBound = decoratedTypeParameterBounds
-        .get((decoratedType.type as FunctionType).typeFormals[0])!;
-    _assertType(decoratedTypeFormalBound.type!, 'Object');
-    var decoratedBaseTypeFormalBound = decoratedTypeParameterBounds
-        .get((decoratedBaseType.type as FunctionType).typeFormals[0])!;
-    expect(decoratedTypeFormalBound.node,
-        isNot(same(decoratedBaseTypeFormalBound.node)));
-  }
-
-  Future
-      test_method_parameterType_inferred_generic_function_typed_with_bound() async {
-    await analyze('''
-class B {
-  void f/*B*/(T Function() x) {}
-}
-class C extends B {
-  void f/*C*/(x) {}
-}
-''');
-    var decoratedBaseType =
-        decoratedMethodType('f/*B*/').positionalParameters![0];
-    var decoratedType = decoratedMethodType('f/*C*/').positionalParameters![0];
-    var decoratedTypeFormalBound = decoratedTypeParameterBounds
-        .get((decoratedType.type as FunctionType).typeFormals[0])!;
-    _assertType(decoratedTypeFormalBound.type!, 'num');
-    var decoratedBaseTypeFormalBound = decoratedTypeParameterBounds
-        .get((decoratedBaseType.type as FunctionType).typeFormals[0])!;
-    expect(decoratedTypeFormalBound.node,
-        isNot(same(decoratedBaseTypeFormalBound.node)));
-  }
-
-  Future test_method_parameterType_inferred_named() async {
-    await analyze('''
-class B {
-  void f({int x = 0}) {}
-}
-class C extends B {
-  void f/*C*/({x = 0}) {}
-}
-''');
-    var decoratedType = decoratedMethodType('f/*C*/').namedParameters!['x']!;
-    expect(decoratedType.node, TypeMatcher());
-  }
-
-  Future test_method_returnType_implicit_dynamic() async {
-    await analyze('''
-class C {
-  f() => 1;
-}
-''');
-    var decoratedType = decoratedMethodType('f').returnType!;
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_method_returnType_inferred() async {
-    await analyze('''
-class B {
-  int f() => 1;
-}
-class C extends B {
-  f/*C*/() => 1;
-}
-''');
-    var decoratedType = decoratedMethodType('f/*C*/').returnType!;
-    expect(decoratedType.node, TypeMatcher());
-  }
-
-  Future test_method_returnType_inferred_dynamic() async {
-    await analyze('''
-class B {
-  dynamic f() => 1;
-}
-class C extends B {
-  f/*C*/() => 1;
-}
-''');
-    var decoratedType = decoratedMethodType('f/*C*/').returnType!;
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_parameters() async {
-    await analyze('''
-void foo({List values})  {
-  values.where((i) => true);
-}
-''');
-    // No assertions; just checking that it doesn't crash.
-  }
-
-  Future test_topLevelFunction_parameterType_implicit_dynamic() async {
-    await analyze('''
-void f(x) {}
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.simpleFormalParameter('x').declaredElement!);
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedType));
-    expect(decoratedType.type is DynamicType, isTrue);
-  }
-
-  Future test_topLevelFunction_parameterType_named_no_default() async {
-    await analyze('''
-void f({String s}) {}
-''');
-    var decoratedType = decoratedTypeAnnotation('String');
-    var functionType = decoratedFunctionType('f');
-    expect(functionType.namedParameters!['s'], same(decoratedType));
-    expect(decoratedType.node, isNotNull);
-    expect(decoratedType.node, isNot(never));
-    expect(decoratedType.node, isNot(always));
-    expect(functionType.namedParameters!['s']!.node.isPossiblyOptional, true);
-  }
-
-  Future
-      test_topLevelFunction_parameterType_named_no_default_required() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-void f({@required String s}) {}
-''');
-    var decoratedType = decoratedTypeAnnotation('String');
-    var functionType = decoratedFunctionType('f');
-    expect(functionType.namedParameters!['s'], same(decoratedType));
-    expect(decoratedType.node, isNotNull);
-    expect(decoratedType.node, isNot(never));
-    expect(decoratedType.node, isNot(always));
-    expect(functionType.namedParameters!['s']!.node.isPossiblyOptional, false);
-  }
-
-  Future
-      test_topLevelFunction_parameterType_named_no_default_required_hint() async {
-    addMetaPackage();
-    await analyze('''
-import 'package:meta/meta.dart';
-void f({/*required*/ String s}) {}
-''');
-    var decoratedType = decoratedTypeAnnotation('String');
-    var functionType = decoratedFunctionType('f');
-    expect(functionType.namedParameters!['s'], same(decoratedType));
-    expect(decoratedType.node, isNotNull);
-    expect(decoratedType.node, isNot(never));
-    expect(decoratedType.node, isNot(always));
-    expect(functionType.namedParameters!['s']!.node.isPossiblyOptional, false);
-    expect(variables.getRequiredHint(testSource, findNode.simpleParameter('s')),
-        isNotNull);
-  }
-
-  Future test_topLevelFunction_parameterType_named_with_default() async {
-    await analyze('''
-void f({String s = 'x'}) {}
-''');
-    var decoratedType = decoratedTypeAnnotation('String');
-    var functionType = decoratedFunctionType('f');
-    expect(functionType.namedParameters!['s'], same(decoratedType));
-    expect(decoratedType.node, isNotNull);
-    expect(decoratedType.node, isNot(never));
-    expect(functionType.namedParameters!['s']!.node.isPossiblyOptional, false);
-  }
-
-  Future test_topLevelFunction_parameterType_positionalOptional() async {
-    await analyze('''
-void f([int i]) {}
-''');
-    var decoratedType = decoratedTypeAnnotation('int');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedType));
-    expect(decoratedType.node, isNotNull);
-    expect(decoratedType.node, isNot(never));
-  }
-
-  Future test_topLevelFunction_parameterType_simple() async {
-    await analyze('''
-void f(int i) {}
-''');
-    var decoratedType = decoratedTypeAnnotation('int');
-    expect(decoratedFunctionType('f').positionalParameters![0],
-        same(decoratedType));
-    expect(decoratedType.node, isNotNull);
-    expect(decoratedType.node, isNot(never));
-  }
-
-  Future test_topLevelFunction_returnType_implicit_dynamic() async {
-    await analyze('''
-f() {}
-''');
-    var decoratedType = decoratedFunctionType('f').returnType!;
-    expect(decoratedType.type is DynamicType, isTrue);
-  }
-
-  Future test_topLevelFunction_returnType_simple() async {
-    await analyze('''
-int f() => 0;
-''');
-    var decoratedType = decoratedTypeAnnotation('int');
-    expect(decoratedFunctionType('f').returnType, same(decoratedType));
-    expect(decoratedType.node, isNotNull);
-    expect(decoratedType.node, isNot(never));
-  }
-
-  Future test_topLevelVariable_type_implicit_dynamic() async {
-    await analyze('''
-var x;
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_topLevelVariable_type_inferred() async {
-    await analyze('''
-var x = 1;
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node, TypeMatcher());
-  }
-
-  Future test_topLevelVariable_type_inferred_dynamic() async {
-    await analyze('''
-dynamic f() {}
-var x = f();
-''');
-    var decoratedType = variables.decoratedElementType(
-        findNode.variableDeclaration('x').declaredElement!);
-    expect(decoratedType.node.isImmutable, false);
-  }
-
-  Future test_type_add_non_null_hint() async {
-    await analyze('''
-void f(int i) {}
-''');
-    final node = decoratedTypeAnnotation('int').node;
-    expect(node.hintActions, contains(HintActionKind.addNonNullableHint));
-    expect(
-        node.hintActions[HintActionKind.addNonNullableHint]
-            .applyTo(super.testCode!),
-        '''
-void f(int/*!*/ i) {}
-''');
-  }
-
-  Future test_type_add_null_hint() async {
-    await analyze('''
-void f(int i) {}
-''');
-    final node = decoratedTypeAnnotation('int').node;
-    expect(node.hintActions, contains(HintActionKind.addNullableHint));
-    expect(
-        node.hintActions[HintActionKind.addNullableHint]
-            .applyTo(super.testCode!),
-        '''
-void f(int/*?*/ i) {}
-''');
-  }
-
-  Future test_type_comment_bang() async {
-    await analyze('''
-void f(int/*!*/ i) {}
-''');
-    final node = decoratedTypeAnnotation('int').node;
-    assertEdge(node, never, hard: true, checkable: false);
-    expect(
-        node.hintActions, isNot(contains(HintActionKind.addNonNullableHint)));
-    expect(node.hintActions, isNot(contains(HintActionKind.addNullableHint)));
-    expect(node.hintActions,
-        isNot(contains(HintActionKind.changeToNonNullableHint)));
-    expect(
-        node.hintActions[HintActionKind.removeNonNullableHint]
-            .applyTo(super.testCode!),
-        '''
-void f(int i) {}
-''');
-    expect(
-        node.hintActions[HintActionKind.changeToNullableHint]
-            .applyTo(super.testCode!),
-        '''
-void f(int/*?*/ i) {}
-''');
-  }
-
-  Future test_type_comment_question() async {
-    await analyze('''
-void f(int/*?*/ i) {}
-''');
-    final node = decoratedTypeAnnotation('int').node;
-    assertUnion(always, node);
-    expect(
-        node.hintActions, isNot(contains(HintActionKind.addNonNullableHint)));
-    expect(node.hintActions, isNot(contains(HintActionKind.addNullableHint)));
-    expect(
-        node.hintActions, isNot(contains(HintActionKind.changeToNullableHint)));
-    expect(
-        node.hintActions[HintActionKind.removeNullableHint]
-            .applyTo(super.testCode!),
-        '''
-void f(int i) {}
-''');
-    expect(
-        node.hintActions[HintActionKind.changeToNonNullableHint]
-            .applyTo(super.testCode!),
-        '''
-void f(int/*!*/ i) {}
-''');
-  }
-
-  Future test_type_nested_add_non_null_hint() async {
-    await analyze('''
-void f(List i) {}
-''');
-    final node = decoratedTypeAnnotation('int').node;
-    expect(node.hintActions, contains(HintActionKind.addNonNullableHint));
-    expect(
-        node.hintActions[HintActionKind.addNonNullableHint]
-            .applyTo(super.testCode!),
-        '''
-void f(List i) {}
-''');
-  }
-
-  Future test_type_nested_add_null_hint() async {
-    await analyze('''
-void f(List i) {}
-''');
-    final node = decoratedTypeAnnotation('int').node;
-    expect(node.hintActions, contains(HintActionKind.addNullableHint));
-    expect(
-        node.hintActions[HintActionKind.addNullableHint]
-            .applyTo(super.testCode!),
-        '''
-void f(List i) {}
-''');
-  }
-
-  Future test_type_parameter_explicit_bound() async {
-    await analyze('''
-class C {}
-''');
-    var bound = decoratedTypeParameterBound('T')!;
-    expect(decoratedTypeAnnotation('Object'), same(bound));
-    expect(bound.node, isNot(always));
-    expect(bound.type, typeProvider.objectType);
-  }
-
-  Future test_type_parameter_implicit_bound() async {
-    // The implicit bound of `T` is automatically `Object?`.  TODO(paulberry):
-    // consider making it possible for type inference to infer an explicit bound
-    // of `Object`.
-    await analyze('''
-class C {}
-''');
-    var bound = decoratedTypeParameterBound('T')!;
-    assertEdge(always, bound.node, hard: false);
-    expect(bound.type, same(typeProvider.objectType));
-  }
-
-  Future test_typedef_reference_generic_instantiated() async {
-    await analyze('''
-typedef F = T Function();
-F f;
-''');
-    // The instantiation of F should produce fresh nullability nodes, distinct
-    // from the ones in the typedef (they will be unified by the edge builder).
-    // This is necessary because there is no guarantee of whether the typedef or
-    // its usage will be visited first.
-    var typedefDecoratedType = variables
-        .decoratedElementType(findElement.typeAlias('F').aliasedElement!);
-    var decoratedType = decoratedTypeAnnotation('F');
-    expect(decoratedType.node, TypeMatcher());
-    expect(decoratedType.node, isNot(same(typedefDecoratedType.node)));
-    _assertType(decoratedType.returnType!.type!, 'int');
-    expect(
-        decoratedType.returnType!.node, TypeMatcher());
-    expect(decoratedType.returnType!.node,
-        isNot(same(typedefDecoratedType.returnType!.node)));
-  }
-
-  Future test_typedef_reference_generic_uninstantiated() async {
-    await analyze('''
-typedef F = T Function();
-F f;
-''');
-    // The instantiation of F should produce fresh nullability nodes, distinct
-    // from the ones in the typedef (they will be unified by the edge builder).
-    // This is necessary because there is no guarantee of whether the typedef or
-    // its usage will be visited first.
-    var typedefDecoratedType = variables
-        .decoratedElementType(findElement.typeAlias('F').aliasedElement!);
-    var decoratedType = decoratedTypeAnnotation('F f');
-    expect(decoratedType.node, TypeMatcher());
-    expect(decoratedType.node, isNot(same(typedefDecoratedType.node)));
-    _assertType(decoratedType.returnType!.type!, 'T');
-    expect(
-        decoratedType.returnType!.node, TypeMatcher());
-    expect(decoratedType.returnType!.node,
-        isNot(same(typedefDecoratedType.returnType!.node)));
-    var decoratedTypeFormalBound = decoratedTypeParameterBounds
-        .get((decoratedType.type as FunctionType).typeFormals[0])!;
-    _assertType(decoratedTypeFormalBound.type!, 'num');
-    expect(decoratedTypeFormalBound.node.displayName,
-        'bound of type formal T of f (test.dart:2:1)');
-    var decoratedTypedefTypeFormalBound = decoratedTypeParameterBounds
-        .get((typedefDecoratedType.type as FunctionType).typeFormals[0])!;
-    expect(decoratedTypeFormalBound.node,
-        isNot(same(decoratedTypedefTypeFormalBound.node)));
-  }
-
-  Future test_typedef_reference_simple() async {
-    await analyze('''
-typedef int F(String s);
-F f;
-''');
-    // The instantiation of F should produce fresh nullability nodes, distinct
-    // from the ones in the typedef (they will be unified by the edge builder).
-    // This is necessary because there is no guarantee of whether the typedef or
-    // its usage will be visited first.
-    var typedefDecoratedType = variables
-        .decoratedElementType(findElement.typeAlias('F').aliasedElement!);
-    var decoratedType = decoratedTypeAnnotation('F f');
-    expect(decoratedType.node, TypeMatcher());
-    expect(decoratedType.node, isNot(same(typedefDecoratedType.node)));
-    _assertType(decoratedType.returnType!.type!, 'int');
-    expect(
-        decoratedType.returnType!.node, TypeMatcher());
-    expect(decoratedType.returnType!.node,
-        isNot(same(typedefDecoratedType.returnType!.node)));
-    expect(typedefDecoratedType.returnType!.node.displayName,
-        'return type of F (test.dart:1:9)');
-    expect(decoratedType.returnType!.node.displayName,
-        'return type of f (test.dart:2:1)');
-    _assertType(decoratedType.positionalParameters![0].type!, 'String');
-    expect(decoratedType.positionalParameters![0].node,
-        TypeMatcher());
-    expect(decoratedType.positionalParameters![0].node,
-        isNot(same(typedefDecoratedType.positionalParameters![0].node)));
-    expect(decoratedType.positionalParameters![0].node.displayName,
-        'parameter 0 of f (test.dart:2:1)');
-  }
-
-  Future test_typedef_reference_simple_named_parameter() async {
-    await analyze('''
-typedef int F({String s});
-F f;
-''');
-    // The instantiation of F should produce fresh nullability nodes, distinct
-    // from the ones in the typedef (they will be unified by the edge builder).
-    // This is necessary because there is no guarantee of whether the typedef or
-    // its usage will be visited first.
-    var decoratedType = decoratedTypeAnnotation('F f');
-    expect(decoratedType.namedParameters!['s']!.node.displayName,
-        'parameter s of f (test.dart:2:1)');
-  }
-
-  Future test_typedef_reference_simple_two_parameters() async {
-    await analyze('''
-typedef int F(String s, int i);
-F f;
-''');
-    // The instantiation of F should produce fresh nullability nodes, distinct
-    // from the ones in the typedef (they will be unified by the edge builder).
-    // This is necessary because there is no guarantee of whether the typedef or
-    // its usage will be visited first.
-    var decoratedType = decoratedTypeAnnotation('F f');
-    expect(decoratedType.positionalParameters![0].node.displayName,
-        'parameter 0 of f (test.dart:2:1)');
-    expect(decoratedType.positionalParameters![1].node.displayName,
-        'parameter 1 of f (test.dart:2:1)');
-  }
-
-  Future test_typedef_rhs_nullability() async {
-    await analyze('''
-typedef F = void Function();
-''');
-    var decorated = decoratedGenericFunctionTypeAnnotation('void Function()');
-    expect(decorated.node, same(never));
-  }
-
-  Future test_variableDeclaration_late_final_hint_simple() async {
-    await analyze('/*late final*/ int i;');
-    expect(
-        variables.getLateHint(
-            testSource, findNode.variableDeclarationList('int i')),
-        isNotNull);
-  }
-
-  Future test_variableDeclaration_late_hint_after_metadata() async {
-    await analyze('@deprecated /*late*/ int i;');
-    expect(
-        variables.getLateHint(
-            testSource, findNode.variableDeclarationList('int i')),
-        isNotNull);
-  }
-
-  Future test_variableDeclaration_late_hint_multiple_comments() async {
-    await analyze('/*other*/ /*late*/ int i;');
-    expect(
-        variables.getLateHint(
-            testSource, findNode.variableDeclarationList('int i')),
-        isNotNull);
-  }
-
-  Future test_variableDeclaration_late_hint_simple() async {
-    await analyze('/*late*/ int i;');
-    expect(
-        variables.getLateHint(
-            testSource, findNode.variableDeclarationList('int i')),
-        isNotNull);
-  }
-
-  Future test_variableDeclaration_late_hint_with_spaces() async {
-    await analyze('/* late */ int i;');
-    expect(
-        variables.getLateHint(
-            testSource, findNode.variableDeclarationList('int i')),
-        isNotNull);
-  }
-
-  Future test_variableDeclaration_type_simple() async {
-    await analyze('''
-main() {
-  int i;
-}
-''');
-    var decoratedType = decoratedTypeAnnotation('int');
-    expect(decoratedType.node, TypeMatcher());
-  }
-
-  Future test_variableDeclaration_visit_initializer() async {
-    await analyze('''
-class C {}
-void f(C c) {
-  var x = c as C;
-}
-''');
-    var decoratedType = decoratedTypeAnnotation('int');
-    expect(decoratedType.node, TypeMatcher());
-  }
-
-  Future test_void_type() async {
-    await analyze('''
-void f() {}
-''');
-    var decoratedType = decoratedTypeAnnotation('void');
-    expect(decoratedFunctionType('f').returnType, same(decoratedType));
-    assertNoEdge(always, decoratedType.node);
-  }
-
-  void _assertType(DartType type, String expected) {
-    var typeStr = type.getDisplayString(withNullability: false);
-    expect(typeStr, expected);
-  }
-}
diff --git a/pkg/nnbd_migration/test/nullability_node_test.dart b/pkg/nnbd_migration/test/nullability_node_test.dart
deleted file mode 100644
index 88893b807918..000000000000
--- a/pkg/nnbd_migration/test/nullability_node_test.dart
+++ /dev/null
@@ -1,772 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/instrumentation.dart';
-import 'package:nnbd_migration/src/edge_origin.dart';
-import 'package:nnbd_migration/src/nullability_node.dart';
-import 'package:nnbd_migration/src/nullability_node_target.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(NullabilityNodeTest);
-  });
-}
-
-@reflectiveTest
-class NullabilityNodeTest {
-  final graph = NullabilityGraphForTesting();
-
-  /// A list of all edges that couldn't be satisfied.  May contain duplicates.
-  late List unsatisfiedEdges;
-
-  List? unsatisfiedSubstitutions;
-
-  NullabilityNode get always => graph.always;
-
-  NullabilityNode get never => graph.never;
-
-  void assertUnsatisfied(List expectedUnsatisfiedEdges) {
-    expect(unsatisfiedEdges.toSet(), expectedUnsatisfiedEdges.toSet());
-  }
-
-  NullabilityEdge connect(NullabilityNode source, NullabilityNode destination,
-      {bool hard = false,
-      bool checkable = true,
-      List guards = const []}) {
-    return graph.connect(source, destination, _TestEdgeOrigin(),
-        hard: hard, checkable: checkable, guards: guards);
-  }
-
-  NullabilityNode lub(NullabilityNode left, NullabilityNode right) {
-    return NullabilityNode.forLUB(left, right);
-  }
-
-  NullabilityNode newNode(int id) =>
-      NullabilityNode.forTypeAnnotation(NullabilityNodeTarget.text('node $id'));
-
-  void propagate() {
-    var propagationResult = graph.propagate();
-    unsatisfiedEdges = propagationResult.unsatisfiedEdges;
-    unsatisfiedSubstitutions = propagationResult.unsatisfiedSubstitutions;
-  }
-
-  NullabilityNode subst(NullabilityNode? inner, NullabilityNode? outer) {
-    return NullabilityNode.forSubstitution(inner, outer);
-  }
-
-  void test_always_and_never_state() {
-    propagate();
-    expect(always.isNullable, isTrue);
-    expect(never.isNullable, isFalse);
-    assertUnsatisfied([]);
-  }
-
-  void test_always_and_never_unaffected_by_hard_edges() {
-    var edge = connect(always, never, hard: true);
-    propagate();
-    expect(always.isNullable, isTrue);
-    expect(never.isNullable, isFalse);
-    assertUnsatisfied([edge]);
-  }
-
-  void test_always_and_never_unaffected_by_soft_edges() {
-    var edge = connect(always, never);
-    propagate();
-    expect(always.isNullable, isTrue);
-    expect(never.isNullable, isFalse);
-    assertUnsatisfied([edge]);
-  }
-
-  void test_always_destination() {
-    // always -> 1 -(hard)-> always
-    var n1 = newNode(1);
-    connect(always, n1);
-    connect(n1, always, hard: true);
-    propagate();
-    // Upstream propagation of non-nullability ignores edges terminating at
-    // `always`, so n1 should be nullable.
-    expect(n1.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_edge_satisfied_due_to_guard() {
-    // always -> 1
-    // 1 -(2) -> 3
-    // 3 -(hard)-> never
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(n1, n3, guards: [n2]);
-    connect(n3, never, hard: true);
-    propagate();
-    expect(n1.isNullable, true);
-    expect(n2.isNullable, false);
-    expect(n3.isNullable, false);
-    // Although n1 is nullable and n3 is non-nullable, the edge from 1 to 3 is
-    // considered satisfied because the guard (n2) is non-nullable.
-    assertUnsatisfied([]);
-  }
-
-  void test_lubNode_relatesInBothDirections() {
-    final nodeA = newNode(1);
-    final nodeB = newNode(2);
-    final lubNode = lub(nodeA, nodeB);
-
-    expect(nodeA.outerCompoundNodes, [lubNode]);
-    expect(nodeB.outerCompoundNodes, [lubNode]);
-  }
-
-  void test_never_source() {
-    // never -> 1
-    var n1 = newNode(1);
-    connect(never, n1);
-    propagate();
-    // Downstream propagation of nullability ignores edges originating at
-    // `never`, so n1 should be non-nullable.
-    expect(n1.isNullable, false);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_always_union() {
-    // always == 1
-    // 1 -(hard)-> never
-    // 1 -> 2
-    // 1 -> 3
-    // 3 -(hard)-> never
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    union(always, n1);
-    var edge_1_never = connect(n1, never, hard: true);
-    connect(n1, n2);
-    var edge_1_3 = connect(n1, n3);
-    connect(n3, never, hard: true);
-    propagate();
-    // Union edges take precedence over hard ones, so n1 should be nullable.
-    expect(n1.isNullable, true);
-    // And nullability should be propagated to n2.
-    expect(n2.isNullable, true);
-    // But it should not be propagated to n3 because non-nullability propagation
-    // takes precedence over ordinary nullability propagation.
-    expect(n3.isNullable, false);
-    assertUnsatisfied([edge_1_never, edge_1_3]);
-  }
-
-  void test_propagation_always_union_reversed() {
-    // always == 1
-    // 1 -(hard)-> never
-    // 1 -> 2
-    // 1 -> 3
-    // 3 -(hard)-> never
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    union(n1, always);
-    var edge_1_never = connect(n1, never, hard: true);
-    connect(n1, n2);
-    var edge_1_3 = connect(n1, n3);
-    connect(n3, never, hard: true);
-    propagate();
-    // Union edges take precedence over hard ones, so n1 should be nullable.
-    expect(n1.isNullable, true);
-    // And nullability should be propagated to n2.
-    expect(n2.isNullable, true);
-    // But it should not be propagated to n3 because non-nullability propagation
-    // takes precedence over ordinary nullability propagation.
-    expect(n3.isNullable, false);
-    assertUnsatisfied([edge_1_never, edge_1_3]);
-  }
-
-  void test_propagation_downstream_breadth_first() {
-    // always -> 1 -> 2
-    //           1 -> 3 -> 4
-    // always -> 5 -> 4
-    //           5 -> 6 -> 2
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(4);
-    var n5 = newNode(5);
-    var n6 = newNode(6);
-    connect(always, n1);
-    connect(n1, n2);
-    connect(n1, n3);
-    connect(n3, n4);
-    connect(always, n5);
-    connect(n5, n4);
-    connect(n5, n6);
-    connect(n6, n2);
-    propagate();
-    // Node 2 should be caused by node 1, since that's the shortest path back to
-    // "always".  Similarly, node 4 should be caused by node 5.
-    expect(_downstreamCauseNode(n2), same(n1));
-    expect(_downstreamCauseNode(n4), same(n5));
-  }
-
-  void test_propagation_downstream_guarded_multiple_guards_all_satisfied() {
-    // always -> 1
-    // always -> 2
-    // always -> 3
-    // 1 -(2,3)-> 4
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(3);
-    connect(always, n1);
-    connect(always, n2);
-    connect(always, n3);
-    connect(n1, n4, guards: [n2, n3]);
-    propagate();
-    expect(n4.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_guarded_multiple_guards_not_all_satisfied() {
-    // always -> 1
-    // always -> 2
-    // 1 -(2,3)-> 4
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(3);
-    connect(always, n1);
-    connect(always, n2);
-    connect(n1, n4, guards: [n2, n3]);
-    propagate();
-    expect(n4.isNullable, false);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_guarded_satisfy_guard_first() {
-    // always -> 1
-    // always -> 2
-    // 2 -(1)-> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(always, n2);
-    connect(n2, n3, guards: [n1]);
-    propagate();
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_guarded_satisfy_source_first() {
-    // always -> 1
-    // always -> 2
-    // 1 -(2)-> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(always, n2);
-    connect(n1, n3, guards: [n2]);
-    propagate();
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_guarded_unsatisfied_guard() {
-    // always -> 1
-    // 1 -(2)-> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(n1, n3, guards: [n2]);
-    propagate();
-    expect(n3.isNullable, false);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_guarded_unsatisfied_source() {
-    // always -> 1
-    // 2 -(1)-> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(n2, n3, guards: [n1]);
-    propagate();
-    expect(n3.isNullable, false);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_reverse_substitution_exact() {
-    // always -> subst(1, 2)
-    // 3 -(uncheckable)-> 1
-    // 4 -(uncheckable)-> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(4);
-    connect(always, subst(n1, n2));
-    connect(n3, n1, checkable: false);
-    connect(n4, n3, checkable: false);
-    propagate();
-    expect(n1.isNullable, true);
-    expect(n1.isExactNullable, true);
-    expect(n2.isNullable, false);
-    expect(n3.isNullable, true);
-    expect(n3.isExactNullable, true);
-    expect(n4.isNullable, true);
-    expect(n4.isExactNullable, true);
-  }
-
-  void test_propagation_downstream_reverse_substitution_exact_checkable() {
-    // always -> subst(1, 2)
-    // 3 -(uncheckable)-> 1
-    // 4 -(checkable)-> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(4);
-    connect(always, subst(n1, n2));
-    connect(n3, n1, checkable: false);
-    connect(n4, n3, checkable: true);
-    propagate();
-    expect(n1.isNullable, true);
-    expect(n1.isExactNullable, true);
-    expect(n2.isNullable, false);
-    expect(n3.isNullable, true);
-    expect(n3.isExactNullable, true);
-    expect(n4.isNullable, false);
-    expect(n4.isExactNullable, false);
-  }
-
-  void test_propagation_downstream_reverse_substitution_inner_non_nullable() {
-    // 1 -> never (hard)
-    // always -> subst(1, 2)
-    // 3 -> 2
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(n1, never, hard: true);
-    connect(always, subst(n1, n2));
-    connect(n3, n2);
-    propagate();
-    expect(n1.isNullable, false);
-    expect(n2.isNullable, true);
-    expect(n2.isExactNullable, false);
-    expect(n3.isNullable, false);
-  }
-
-  void test_propagation_downstream_reverse_substitution_non_null_intent() {
-    // always -> subst(1, 2)
-    // 3 -(uncheckable)-> 1
-    // 4 -(checkable)-> 3
-    // 4 -(hard) -> never
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(4);
-    connect(always, subst(n1, n2));
-    connect(n3, n1, checkable: false);
-    connect(n4, n3, checkable: false);
-    connect(n4, never, hard: true);
-    propagate();
-    expect(n1.isNullable, true);
-    expect(n1.isExactNullable, true);
-    expect(n2.isNullable, false);
-    expect(n3.isNullable, true);
-    expect(n3.isExactNullable, true);
-    expect(n4.isNullable, false);
-    expect(n4.isExactNullable, false);
-  }
-
-  void
-      test_propagation_downstream_reverse_substitution_outer_already_nullable() {
-    // always -> 2
-    // always -> subst(1, 2)
-    // 3 -> 2
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n2);
-    connect(always, subst(n1, n2));
-    connect(n3, n2);
-    propagate();
-    expect(n1.isNullable, false);
-    expect(n2.isNullable, true);
-    expect(n2.isExactNullable, false);
-    expect(n3.isNullable, false);
-  }
-
-  void test_propagation_downstream_reverse_substitution_unsatisfiable() {
-    // 1 -> never (hard)
-    // 2 -> never (hard)
-    // always -> subst(1, 2)
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    connect(n1, never, hard: true);
-    connect(n2, never, hard: true);
-    var substitutionNode = subst(n1, n2);
-    connect(always, substitutionNode);
-    propagate();
-    expect(n1.isNullable, false);
-    expect(n2.isNullable, false);
-    expect(substitutionNode.isNullable, false);
-    expect(unsatisfiedSubstitutions, isEmpty);
-  }
-
-  void test_propagation_downstream_through_lub_both() {
-    // always -> 1
-    // always -> 2
-    // LUB(1, 2) -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(always, n2);
-    connect(lub(n1, n2), n3);
-    propagate();
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_lub_cascaded() {
-    // always -> 1
-    // LUB(LUB(1, 2), 3) -> 4
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(3);
-    connect(always, n1);
-    connect(lub(lub(n1, n2), n3), n4);
-    propagate();
-    expect(n4.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_lub_left() {
-    // always -> 1
-    // LUB(1, 2) -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(lub(n1, n2), n3);
-    propagate();
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_lub_neither() {
-    // LUB(1, 2) -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(lub(n1, n2), n3);
-    propagate();
-    expect(n3.isNullable, false);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_lub_right() {
-    // always -> 2
-    // LUB(1, 2) -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n2);
-    connect(lub(n1, n2), n3);
-    propagate();
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_substitution_both() {
-    // always -> 1
-    // always -> 2
-    // subst(1, 2) -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(always, n2);
-    connect(subst(n1, n2), n3);
-    propagate();
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_substitution_cascaded() {
-    // always -> 1
-    // subst(subst(1, 2), 3) -> 4
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(3);
-    connect(always, n1);
-    connect(subst(subst(n1, n2), n3), n4);
-    propagate();
-    expect(n4.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_substitution_inner() {
-    // always -> 1
-    // subst(1, 2) -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    connect(subst(n1, n2), n3);
-    propagate();
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_substitution_neither() {
-    // subst(1, 2) -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(subst(n1, n2), n3);
-    propagate();
-    expect(n3.isNullable, false);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_substitution_outer() {
-    // always -> 2
-    // subst(1, 2) -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n2);
-    connect(subst(n1, n2), n3);
-    propagate();
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_union() {
-    // always -> 1
-    // 1 == 2
-    // 2 -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    union(n1, n2);
-    connect(n2, n3);
-    propagate();
-    expect(n1.isNullable, true);
-    expect(n2.isNullable, true);
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_downstream_through_union_reversed() {
-    // always -> 1
-    // 2 == 1
-    // 2 -> 3
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    union(n2, n1);
-    connect(n2, n3);
-    propagate();
-    expect(n1.isNullable, true);
-    expect(n2.isNullable, true);
-    expect(n3.isNullable, true);
-    assertUnsatisfied([]);
-  }
-
-  void test_propagation_simple() {
-    // always -(soft)-> 1 -(soft)-> 2 -(hard) -> 3 -(hard)-> never
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    connect(always, n1);
-    var edge_1_2 = connect(n1, n2);
-    connect(n2, n3, hard: true);
-    connect(n3, never, hard: true);
-    propagate();
-    expect(n1.isNullable, true);
-    expect(n2.isNullable, false);
-    expect(n3.isNullable, false);
-    assertUnsatisfied([edge_1_2]);
-  }
-
-  void test_propagation_upstream_breadth_first() {
-    // never <- 1 <- 2
-    //          1 <- 3 <- 4
-    // never <- 5 <- 4
-    //          5 <- 6 <- 2
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var n4 = newNode(4);
-    var n5 = newNode(5);
-    var n6 = newNode(6);
-    connect(n1, never, hard: true);
-    connect(n2, n1, hard: true);
-    connect(n3, n1, hard: true);
-    connect(n4, n3, hard: true);
-    connect(n5, never, hard: true);
-    connect(n4, n5, hard: true);
-    connect(n6, n5, hard: true);
-    connect(n2, n6, hard: true);
-    propagate();
-    // Node 2 should be caused by node 1, since that's the shortest path back to
-    // "always".  Similarly, node 4 should be caused by node 5.
-    expect(_upstreamCauseNode(n2), same(n1));
-    expect(_upstreamCauseNode(n4), same(n5));
-  }
-
-  void test_propagation_upstream_through_union() {
-    // always -> 1
-    // always -> 2
-    // always -> 3
-    // 1 -(hard)-> 2
-    // 2 == 3
-    // 3 -(hard)-> never
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var edge_always_1 = connect(always, n1);
-    var edge_always_2 = connect(always, n2);
-    var edge_always_3 = connect(always, n3);
-    connect(n1, n2, hard: true);
-    union(n2, n3);
-    connect(n3, never, hard: true);
-    propagate();
-    expect(n1.isNullable, false);
-    expect(n2.isNullable, false);
-    expect(n3.isNullable, false);
-    assertUnsatisfied([edge_always_1, edge_always_2, edge_always_3]);
-  }
-
-  void test_propagation_upstream_through_union_reversed() {
-    // always -> 1
-    // always -> 2
-    // always -> 3
-    // 1 -(hard)-> 2
-    // 3 == 2
-    // 3 -(hard)-> never
-    var n1 = newNode(1);
-    var n2 = newNode(2);
-    var n3 = newNode(3);
-    var edge_always_1 = connect(always, n1);
-    var edge_always_2 = connect(always, n2);
-    var edge_always_3 = connect(always, n3);
-    connect(n1, n2, hard: true);
-    union(n3, n2);
-    connect(n3, never, hard: true);
-    propagate();
-    expect(n1.isNullable, false);
-    expect(n2.isNullable, false);
-    expect(n3.isNullable, false);
-    assertUnsatisfied([edge_always_1, edge_always_2, edge_always_3]);
-  }
-
-  void test_satisfied_edge_destination_nullable() {
-    var n1 = newNode(1);
-    var edge = connect(always, n1);
-    propagate();
-    assertUnsatisfied([]);
-    expect(edge.isSatisfied, true);
-  }
-
-  void test_satisfied_edge_source_non_nullable() {
-    var n1 = newNode(1);
-    var n2 = newNode(1);
-    var edge = connect(n1, n2);
-    propagate();
-    assertUnsatisfied([]);
-    expect(edge.isSatisfied, true);
-  }
-
-  void test_satisfied_edge_two_sources_first_non_nullable() {
-    var n1 = newNode(1);
-    var n2 = newNode(1);
-    connect(always, n2);
-    var edge = connect(n1, never, guards: [n2]);
-    propagate();
-    assertUnsatisfied([]);
-    expect(edge.isSatisfied, true);
-  }
-
-  void test_satisfied_edge_two_sources_second_non_nullable() {
-    var n1 = newNode(1);
-    var n2 = newNode(1);
-    connect(always, n1);
-    var edge = connect(n1, never, guards: [n2]);
-    propagate();
-    assertUnsatisfied([]);
-    expect(edge.isSatisfied, true);
-  }
-
-  void test_substitution_simplify_null() {
-    var n1 = newNode(1);
-    expect(subst(null, n1), same(n1));
-    expect(subst(n1, null), same(n1));
-  }
-
-  void test_substitutionNode_relatesInBothDirections() {
-    final nodeA = newNode(1);
-    final nodeB = newNode(2);
-    final substNode = subst(nodeA, nodeB);
-
-    expect(nodeA.outerCompoundNodes, [substNode]);
-    expect(nodeB.outerCompoundNodes, [substNode]);
-  }
-
-  void test_unconstrained_node_non_nullable() {
-    var n1 = newNode(1);
-    propagate();
-    expect(n1.isNullable, false);
-    assertUnsatisfied([]);
-  }
-
-  void test_unsatisfied_edge_multiple_sources() {
-    var n1 = newNode(1);
-    connect(always, n1);
-    var edge = connect(always, never, guards: [n1]);
-    propagate();
-    assertUnsatisfied([edge]);
-    expect(edge.isSatisfied, false);
-  }
-
-  void test_unsatisfied_edge_single_source() {
-    var edge = connect(always, never);
-    propagate();
-    assertUnsatisfied([edge]);
-    expect(edge.isSatisfied, false);
-  }
-
-  void union(NullabilityNode x, NullabilityNode y) {
-    graph.union(x, y, _TestEdgeOrigin());
-  }
-
-  NullabilityNode? _downstreamCauseNode(NullabilityNode node) =>
-      (node.whyNullable as SimpleDownstreamPropagationStep).edge.sourceNode;
-
-  NullabilityNode _upstreamCauseNode(NullabilityNode node) =>
-      node.whyNotNullable!.principalCause!.node;
-}
-
-class _TestEdgeOrigin implements EdgeOrigin {
-  @override
-  CodeReference? get codeReference => null;
-
-  @override
-  String get description => 'Test edge';
-
-  @override
-  bool get isSetupAssignment => false;
-
-  @override
-  EdgeOriginKind? get kind => null;
-
-  @override
-  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
-}
diff --git a/pkg/nnbd_migration/test/preview/preview_site_test.dart b/pkg/nnbd_migration/test/preview/preview_site_test.dart
deleted file mode 100644
index 01bdcfb556aa..000000000000
--- a/pkg/nnbd_migration/test/preview/preview_site_test.dart
+++ /dev/null
@@ -1,632 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/src/test_utilities/resource_provider_mixin.dart';
-import 'package:analyzer_plugin/protocol/protocol_common.dart'
-    hide NavigationTarget;
-import 'package:nnbd_migration/nnbd_migration.dart';
-import 'package:nnbd_migration/src/front_end/dartfix_listener.dart';
-import 'package:nnbd_migration/src/front_end/migration_info.dart';
-import 'package:nnbd_migration/src/front_end/migration_state.dart';
-import 'package:nnbd_migration/src/front_end/navigation_tree_renderer.dart';
-import 'package:nnbd_migration/src/front_end/offset_mapper.dart';
-import 'package:nnbd_migration/src/front_end/path_mapper.dart';
-import 'package:nnbd_migration/src/front_end/web/navigation_tree.dart';
-import 'package:nnbd_migration/src/preview/preview_site.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import '../front_end/nnbd_migration_test_base.dart';
-import '../utilities/test_logger.dart';
-
-void main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(PreviewSiteTest);
-    defineReflectiveTests(PreviewSiteWithEngineTest);
-  });
-}
-
-@reflectiveTest
-class PreviewSiteTest with ResourceProviderMixin, PreviewSiteTestMixin {
-  @override
-  Future performEdit(String path, int offset, String replacement) {
-    final pathUri = Uri.file(path).path;
-    return site
-        .performEdit(Uri.parse('localhost://$pathUri?offset=$offset&end=$offset'
-            '&replacement=${Uri.encodeComponent(replacement)}'));
-  }
-
-  void setUp() {
-    dartfixListener = DartFixListener(null, ListenerClient());
-    final migrationInfo =
-        MigrationInfo({}, {}, resourceProvider.pathContext, null);
-    state = MigrationState(
-        null, null, dartfixListener, null, {}, (String? path) => true);
-    state!.pathMapper = PathMapper(resourceProvider);
-    state!.migrationInfo = migrationInfo;
-    logger = TestLogger(false /*isVerbose*/);
-    site = PreviewSite(state, () async {
-      return state;
-    }, () {}, logger);
-  }
-
-  void test_apply_regress41391() async {
-    final path = convertPath('/test.dart');
-    final file = getFile(path);
-    final analysisOptionsPath = convertPath('/analysis_options.yaml');
-    final analysisOptions = getFile(analysisOptionsPath);
-    analysisOptions.writeAsStringSync('analyzer:');
-    final content = 'void main() {}';
-    file.writeAsStringSync(content);
-    site.unitInfoMap[path] = UnitInfo(path)..diskContent = content;
-    // Add a source change for analysis_options, which has no UnitInfo.
-    dartfixListener!.addSourceFileEdit(
-        'enable experiment',
-        Location(analysisOptionsPath, 9, 0, 1, 9, endLine: 1, endColumn: 9),
-        SourceFileEdit(analysisOptionsPath, 0, edits: [
-          SourceEdit(9, 0, '\n  enable-experiment:\n  - non-nullable')
-        ]));
-    // This should not crash.
-    site.performApply([]);
-    expect(analysisOptions.readAsStringSync(), '''
-analyzer:
-  enable-experiment:
-  - non-nullable''');
-    expect(state!.hasBeenApplied, true);
-  }
-
-  void test_applyChangesEmpty() {
-    final file = getFile('/test.dart');
-    file.writeAsStringSync('void main() {}');
-    site.performApply([]);
-    expect(file.readAsStringSync(), 'void main() {}');
-    expect(state!.hasBeenApplied, true);
-  }
-
-  void test_applyChangesTwiceThrows() {
-    site.performApply([]);
-    expect(() => site.performApply([]), throwsA(isA()));
-  }
-
-  void test_applyMigration_sanityCheck_dontApply() async {
-    final path = convertPath('/test.dart');
-    final file = getFile(path);
-    site.unitInfoMap[path] = UnitInfo(path)
-      ..diskContent = '// different content';
-    final currentContent = 'void main() {}';
-    file.writeAsStringSync(currentContent);
-    dartfixListener!.addSourceFileEdit(
-        'test change',
-        Location(path, 10, 0, 1, 10, endLine: 1, endColumn: 10),
-        SourceFileEdit(path, 0, edits: [SourceEdit(10, 0, 'List args')]));
-    expect(() => site.performApply([]), throwsA(isA()));
-    expect(file.readAsStringSync(), currentContent);
-    expect(state!.hasBeenApplied, false);
-  }
-
-  void test_applyMultipleChanges() {
-    final path = convertPath('/test.dart');
-    final file = getFile(path);
-    final content = 'void main() {}';
-    file.writeAsStringSync(content);
-    site.unitInfoMap[path] = UnitInfo(path)..diskContent = content;
-    dartfixListener!.addSourceFileEdit(
-        'test change',
-        Location(path, 10, 0, 1, 10, endLine: 1, endColumn: 10),
-        SourceFileEdit(path, 0, edits: [
-          SourceEdit(10, 0, 'List args'),
-          SourceEdit(13, 0, '\n  print(args);\n')
-        ]));
-    site.performApply([]);
-    expect(file.readAsStringSync(), '''
-void main(List args) {
-  print(args);
-}''');
-    expect(state!.hasBeenApplied, true);
-  }
-
-  void test_applySingleChange() {
-    final path = convertPath('/test.dart');
-    final file = getFile(path);
-    final content = 'void main() {}';
-    file.writeAsStringSync(content);
-    site.unitInfoMap[path] = UnitInfo(path)..diskContent = content;
-    dartfixListener!.addSourceFileEdit(
-        'test change',
-        Location(path, 10, 0, 1, 10, endLine: 1, endColumn: 10),
-        SourceFileEdit(path, 0, edits: [SourceEdit(10, 0, 'List args')]));
-    site.performApply([]);
-    expect(file.readAsStringSync(), 'void main(List args) {}');
-    expect(state!.hasBeenApplied, true);
-  }
-
-  void test_optOutOfNullSafety_blankLines() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('  \n  \n'),
-        equals('// @dart=2.9\n\n  \n  \n'));
-  }
-
-  void test_optOutOfNullSafety_blankLines_windows() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('  \r\n  \r\n'),
-        equals('// @dart=2.9\r\n\r\n  \r\n  \r\n'));
-  }
-
-  void test_optOutOfNullSafety_commentThenCode() {
-    expect(
-        IncrementalPlan.optCodeOutOfNullSafety('// comment\n\nvoid main() {}'),
-        equals('// comment\n\n// @dart=2.9\n\nvoid main() {}'));
-  }
-
-  void test_optOutOfNullSafety_commentThenCode_windows() {
-    expect(
-        IncrementalPlan.optCodeOutOfNullSafety(
-            '// comment\r\n\r\nvoid main() {}'),
-        equals('// comment\r\n\r\n// @dart=2.9\r\n\r\nvoid main() {}'));
-  }
-
-  void test_optOutOfNullSafety_commentThenDirective() {
-    expect(
-        IncrementalPlan.optCodeOutOfNullSafety(
-            '// comment\nimport "dart:core";'),
-        equals('// comment\n\n// @dart=2.9\n\nimport "dart:core";'));
-  }
-
-  void test_optOutOfNullSafety_commentThenDirective_multiLine() {
-    expect(
-        IncrementalPlan.optCodeOutOfNullSafety(
-            '// comment\n// comment\nimport "dart:core";'),
-        equals(
-            '// comment\n// comment\n\n// @dart=2.9\n\nimport "dart:core";'));
-  }
-
-  void test_optOutOfNullSafety_commentThenSemicolon() {
-    expect(
-        IncrementalPlan.optCodeOutOfNullSafety('// comment\n;\nvoid main() {}'),
-        equals('// comment\n\n// @dart=2.9\n\n;\nvoid main() {}'));
-  }
-
-  void test_optOutOfNullSafety_empty() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety(''), equals('// @dart=2.9'));
-  }
-
-  void test_optOutOfNullSafety_singleComment_multiLine() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('// line 1\n// line 2'),
-        equals('// line 1\n// line 2\n\n// @dart=2.9\n'));
-  }
-
-  void test_optOutOfNullSafety_singleComment_multiLine_indented() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('  // line 1\n  // line 2'),
-        equals('  // line 1\n  // line 2\n\n// @dart=2.9\n'));
-  }
-
-  void test_optOutOfNullSafety_singleComment_singleLine() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('// comment'),
-        equals('// comment\n\n// @dart=2.9\n'));
-  }
-
-  void test_optOutOfNullSafety_singleComment_singleLine_trailingNewline() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('// comment\n'),
-        equals('// comment\n\n\n// @dart=2.9\n'));
-  }
-
-  void test_optOutOfNullSafety_singleLine() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('void main() {}'),
-        equals('// @dart=2.9\n\nvoid main() {}'));
-  }
-
-  void test_optOutOfNullSafety_singleLine_afterBlankLines() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('\n\nvoid main() {}'),
-        equals('// @dart=2.9\n\n\n\nvoid main() {}'));
-  }
-
-  void test_optOutOfNullSafety_singleLine_windows() {
-    expect(IncrementalPlan.optCodeOutOfNullSafety('void main() {}\r\n'),
-        equals('// @dart=2.9\r\n\r\nvoid main() {}\r\n'));
-  }
-
-  void test_performEdit() {
-    final path = convertPath('/test.dart');
-    final file = getFile(path);
-    final content = 'int foo() {}';
-    final unitInfo = UnitInfo(path)
-      ..diskContent = content
-      ..content = content
-      ..diskChangesOffsetMapper = OffsetMapper.identity;
-    site.unitInfoMap[path] = unitInfo;
-    file.writeAsStringSync(content);
-    performEdit(path, 3, '/*?*/');
-    expect(file.readAsStringSync(), 'int/*?*/ foo() {}');
-    expect(state!.hasBeenApplied, false);
-    expect(state!.needsRerun, true);
-    expect(unitInfo.content, 'int/*?*/ foo() {}');
-  }
-
-  void test_performEdit_sanityCheck_dontApply() {
-    final path = convertPath('/test.dart');
-    final file = getFile(path);
-    site.unitInfoMap[path] = UnitInfo(path)
-      ..diskContent = '// different content';
-    final currentContent = 'void main() {}';
-    file.writeAsStringSync(currentContent);
-    expect(() => performEdit(path, 0, 'foo'), throwsA(isA()));
-    expect(file.readAsStringSync(), currentContent);
-    expect(state!.hasBeenApplied, false);
-  }
-}
-
-mixin PreviewSiteTestMixin {
-  late PreviewSite site;
-  DartFixListener? dartfixListener;
-  MigrationState? state;
-  TestLogger? logger;
-
-  Future performEdit(String path, int offset, String replacement) {
-    final pathUri = Uri.file(path).path;
-    return site
-        .performEdit(Uri.parse('localhost://$pathUri?offset=$offset&end=$offset'
-            '&replacement=${Uri.encodeComponent(replacement)}'));
-  }
-}
-
-@reflectiveTest
-class PreviewSiteWithEngineTest extends NnbdMigrationTestBase
-    with PreviewSiteTestMixin {
-  MigrationInfo? migrationInfo;
-
-  Future setUpMigrationInfo(Map files,
-      {bool Function(String?)? shouldBeMigratedFunction,
-      Iterable? pathsToProcess}) async {
-    shouldBeMigratedFunction ??= (String? path) => true;
-    pathsToProcess ??= files.keys;
-    await buildInfoForTestFiles(files,
-        includedRoot: projectPath,
-        shouldBeMigratedFunction: shouldBeMigratedFunction,
-        pathsToProcess: pathsToProcess);
-    dartfixListener = DartFixListener(null, ListenerClient());
-    migrationInfo =
-        MigrationInfo(infos, {}, resourceProvider.pathContext, projectPath);
-    state = MigrationState(
-        null, null, dartfixListener, null, {}, shouldBeMigratedFunction);
-    nodeMapper = state!.nodeMapper;
-    state!.pathMapper = PathMapper(resourceProvider);
-    state!.migrationInfo = migrationInfo;
-    logger = TestLogger(false /*isVerbose*/);
-    site = PreviewSite(state, () async {
-      return state;
-    }, () {}, logger);
-  }
-
-  void test_applyHintAction() async {
-    await setUpMigrationInfo({});
-    final path = convertPath('$projectPath/bin/test.dart');
-    final file = getFile(path);
-    final content = r'''
-int x;
-int y = x;
-''';
-    file.writeAsStringSync(content);
-    final migratedContent = '''
-int? x;
-int? y = x;
-''';
-    final unitInfo = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    site.unitInfoMap[path] = unitInfo;
-    await site.performHintAction(
-        unitInfo.regions[1].traces[0].entries[0].hintActions[0]);
-    await site.performHintAction(
-        unitInfo.regions[1].traces[0].entries[2].hintActions[0]);
-    expect(file.readAsStringSync(), '''
-int/*?*/ x;
-int/*?*/ y = x;
-''');
-    expect(unitInfo.content, '''
-int/*?*/? x;
-int/*?*/? y = x;
-''');
-    assertRegion(
-        region: unitInfo.regions[0], offset: unitInfo.content!.indexOf('? x'));
-    assertRegion(
-        region: unitInfo.regions[1], offset: unitInfo.content!.indexOf('? y'));
-    final targets = List.from(unitInfo.targets);
-    assertInTargets(
-        targets: targets,
-        offset: unitInfo.content!.indexOf('x'),
-        offsetMapper: unitInfo.offsetMapper);
-    assertInTargets(
-        targets: targets,
-        offset: unitInfo.content!.indexOf('y'),
-        offsetMapper: unitInfo.offsetMapper);
-    var trace = unitInfo.regions[1].traces[0];
-    assertTraceEntry(
-        unitInfo,
-        trace.entries[0],
-        'y',
-        unitInfo.content!.indexOf('int/*?*/? y'),
-        contains('y (test.dart:2:1)'));
-    assertTraceEntry(unitInfo, trace.entries[1], 'y',
-        unitInfo.content!.indexOf('= x;') + '= '.length, contains('data flow'));
-    expect(state!.hasBeenApplied, false);
-    expect(state!.needsRerun, true);
-  }
-
-  void test_applyHintAction_removeHint() async {
-    await setUpMigrationInfo({});
-    final path = convertPath('$projectPath/bin/test.dart');
-    final file = getFile(path);
-    final content = r'''
-int/*!*/ x;
-int y = x;
-''';
-    file.writeAsStringSync(content);
-    final migratedContent = '''
-int/*!*/ x;
-int  y = x;
-''';
-    final unitInfo = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    site.unitInfoMap[path] = unitInfo;
-    await site.performHintAction(
-        unitInfo.regions[0].traces[0].entries[0].hintActions[0]);
-    expect(file.readAsStringSync(), '''
-int x;
-int y = x;
-''');
-    expect(unitInfo.content, '''
-int x;
-int  y = x;
-''');
-    expect(unitInfo.regions, hasLength(1));
-    assertRegion(
-        kind: NullabilityFixKind.typeNotMadeNullable,
-        region: unitInfo.regions[0],
-        offset: unitInfo.content!.indexOf('  y'));
-    final targets = List.from(unitInfo.targets);
-    assertInTargets(
-        targets: targets,
-        offset: unitInfo.content!.indexOf('x'),
-        offsetMapper: unitInfo.offsetMapper);
-    expect(state!.hasBeenApplied, false);
-    expect(state!.needsRerun, true);
-  }
-
-  void test_applyMigration_doNotOptOutFileNotInPathsToProcess() async {
-    final pathA = convertPath('$projectPath/lib/a.dart');
-    final pathB = convertPath('$projectPath/lib/b.dart');
-    final content = 'void main() {}';
-    await setUpMigrationInfo({pathA: content, pathB: content},
-        // Neither [pathA] nor [[pathB] should be migrated.
-        shouldBeMigratedFunction: (String? path) => false,
-        pathsToProcess: [pathA]);
-    site.unitInfoMap[pathA] = UnitInfo(pathA)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = false
-      ..migrationStatus = UnitMigrationStatus.optingOut;
-    site.unitInfoMap[pathB] = UnitInfo(pathB)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = false
-      ..migrationStatus = UnitMigrationStatus.optingOut;
-    var navigationTree =
-        NavigationTreeRenderer(migrationInfo, state!.pathMapper).render();
-    site.performApply(navigationTree);
-    expect(getFile(pathA).readAsStringSync(), '''
-// @dart=2.9
-
-void main() {}''');
-    expect(getFile(pathB).readAsStringSync(), 'void main() {}');
-  }
-
-  void test_applyMigration_migratePreviouslyOptedOutFile() async {
-    final path = convertPath('$projectPath/lib/a.dart');
-    final content = '''
-// @dart=2.9
-
-void main() {}''';
-    await setUpMigrationInfo({path: content});
-    site.unitInfoMap[path] = UnitInfo(path)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = true;
-    dartfixListener!.addSourceFileEdit(
-        'remove DLV comment',
-        Location(path, 0, 14, 1, 1, endLine: 3, endColumn: 1),
-        SourceFileEdit(path, 0, edits: [SourceEdit(0, 14, '')]));
-    var navigationTree =
-        NavigationTreeRenderer(migrationInfo, state!.pathMapper).render();
-    site.performApply(navigationTree);
-    expect(getFile(path).readAsStringSync(), 'void main() {}');
-    expect(logger!.stdoutBuffer.toString(), contains('''
-Migrated 1 file:
-    ${convertPath('lib/a.dart')}
-'''));
-  }
-
-  void test_applyMigration_optOutEmptyFile() async {
-    final path = convertPath('$projectPath/lib/a.dart');
-    final content = '';
-    await setUpMigrationInfo({path: content});
-    site.unitInfoMap[path] = UnitInfo(path)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = false;
-    var navigationTree =
-        NavigationTreeRenderer(migrationInfo, state!.pathMapper).render();
-    var libDir = navigationTree.single as NavigationTreeDirectoryNode;
-    (libDir.subtree!.single as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.optingOut;
-    site.performApply(navigationTree);
-    expect(getFile(path).readAsStringSync(), '// @dart=2.9');
-    expect(logger!.stdoutBuffer.toString(), contains('''
-Opted 1 file out of null safety with a new Dart language version comment:
-    ${convertPath('lib/a.dart')}
-'''));
-  }
-
-  void test_applyMigration_optOutFileWithEdits() async {
-    final path = convertPath('$projectPath/lib/a.dart');
-    final content = 'void main() {}';
-    await setUpMigrationInfo({path: content});
-    site.unitInfoMap[path] = UnitInfo(path)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = false;
-    dartfixListener!.addSourceFileEdit(
-        'test change',
-        Location(path, 10, 0, 1, 10, endLine: 1, endColumn: 10),
-        SourceFileEdit(path, 0, edits: [SourceEdit(10, 0, 'List args')]));
-    var navigationTree =
-        NavigationTreeRenderer(migrationInfo, state!.pathMapper).render();
-    var libDir = navigationTree.single as NavigationTreeDirectoryNode;
-    (libDir.subtree!.single as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.optingOut;
-    site.performApply(navigationTree);
-    expect(getFile(path).readAsStringSync(), '''
-// @dart=2.9
-
-void main() {}''');
-    expect(logger!.stdoutBuffer.toString(), contains('''
-Opted 1 file out of null safety with a new Dart language version comment:
-    ${convertPath('lib/a.dart')}
-'''));
-  }
-
-  void test_applyMigration_optOutFileWithoutEdits() async {
-    final path = convertPath('$projectPath/lib/a.dart');
-    final content = 'void main() {}';
-    await setUpMigrationInfo({path: content});
-    site.unitInfoMap[path] = UnitInfo(path)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = false;
-    var navigationTree =
-        NavigationTreeRenderer(migrationInfo, state!.pathMapper).render();
-    var libDir = navigationTree.single as NavigationTreeDirectoryNode;
-    (libDir.subtree!.single as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.optingOut;
-    site.performApply(navigationTree);
-    expect(getFile(path).readAsStringSync(), '''
-// @dart=2.9
-
-void main() {}''');
-    expect(logger!.stdoutBuffer.toString(), contains('''
-Opted 1 file out of null safety with a new Dart language version comment:
-    ${convertPath('lib/a.dart')}
-'''));
-  }
-
-  void test_applyMigration_optOutOne_migrateAnother() async {
-    final pathA = convertPath('$projectPath/lib/a.dart');
-    final pathB = convertPath('$projectPath/lib/b.dart');
-    final content = 'void main() {}';
-    await setUpMigrationInfo({pathA: content, pathB: content});
-    site.unitInfoMap[pathA] = UnitInfo(pathA)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = false;
-    site.unitInfoMap[pathB] = UnitInfo(pathB)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = false;
-    dartfixListener!.addSourceFileEdit(
-        'test change',
-        Location(pathA, 10, 0, 1, 10, endLine: 1, endColumn: 10),
-        SourceFileEdit(pathA, 0, edits: [SourceEdit(10, 0, 'List args')]));
-    dartfixListener!.addSourceFileEdit(
-        'test change',
-        Location(pathB, 10, 0, 1, 10, endLine: 1, endColumn: 10),
-        SourceFileEdit(pathB, 0, edits: [SourceEdit(10, 0, 'List args')]));
-    var navigationTree =
-        NavigationTreeRenderer(migrationInfo, state!.pathMapper).render();
-    var libDir = navigationTree.single as NavigationTreeDirectoryNode;
-    (libDir.subtree![0] as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.optingOut;
-    site.performApply(navigationTree);
-    expect(getFile(pathA).readAsStringSync(), '''
-// @dart=2.9
-
-void main() {}''');
-    expect(getFile(pathB).readAsStringSync(), '''
-void main(List args) {}''');
-    expect(logger!.stdoutBuffer.toString(), contains('''
-Migrated 1 file:
-    ${convertPath('lib/b.dart')}
-Opted 1 file out of null safety with a new Dart language version comment:
-    ${convertPath('lib/a.dart')}
-'''));
-  }
-
-  void test_applyMigration_optOutPreviouslyOptedOutFile() async {
-    final path = convertPath('$projectPath/lib/a.dart');
-    final content = '''
-// @dart=2.9
-
-int a;''';
-    await setUpMigrationInfo({path: content});
-    site.unitInfoMap[path] = UnitInfo(path)
-      ..diskContent = content
-      ..wasExplicitlyOptedOut = true;
-    dartfixListener!.addSourceFileEdit(
-        'remove DLV comment',
-        Location(path, 0, 14, 1, 1, endLine: 3, endColumn: 1),
-        SourceFileEdit(path, 0, edits: [SourceEdit(0, 14, '')]));
-    var navigationTree =
-        NavigationTreeRenderer(migrationInfo, state!.pathMapper).render();
-    var libDir = navigationTree.single as NavigationTreeDirectoryNode;
-    (libDir.subtree!.single as NavigationTreeFileNode).migrationStatus =
-        UnitMigrationStatus.optingOut;
-    site.performApply(navigationTree);
-    expect(getFile(path).readAsStringSync(), content);
-    expect(logger!.stdoutBuffer.toString(), contains('''
-Kept 1 file opted out of null safety:
-    ${convertPath('lib/a.dart')}
-'''));
-  }
-
-  void test_performEdit_multiple() async {
-    await setUpMigrationInfo({});
-    final path = convertPath('/test.dart');
-    final file = getFile(path);
-    final content = r'''
-int x;
-int y = x;
-''';
-    file.writeAsStringSync(content);
-    final migratedContent = '''
-int? x;
-int? y = x;
-''';
-    final unitInfo = await buildInfoForSingleTestFile(content,
-        migratedContent: migratedContent);
-    site.unitInfoMap[path] = unitInfo;
-    final firstEditOffset = unitInfo.regions[0].edits[0].offset;
-    performEdit(path, firstEditOffset, '/*?*/');
-    final secondEditOffset = unitInfo.regions[1].edits[0].offset;
-    performEdit(path, secondEditOffset, '/*?*/');
-    expect(file.readAsStringSync(), '''
-int/*?*/ x;
-int/*?*/ y = x;
-''');
-    expect(unitInfo.content, '''
-int/*?*/? x;
-int/*?*/? y = x;
-''');
-    assertRegion(
-        region: unitInfo.regions[0], offset: unitInfo.content!.indexOf('? x'));
-    assertRegion(
-        region: unitInfo.regions[1], offset: unitInfo.content!.indexOf('? y'));
-    final targets = List.from(unitInfo.targets);
-    assertInTargets(
-        targets: targets,
-        offset: unitInfo.content!.indexOf('x'),
-        offsetMapper: unitInfo.offsetMapper);
-    assertInTargets(
-        targets: targets,
-        offset: unitInfo.content!.indexOf('y'),
-        offsetMapper: unitInfo.offsetMapper);
-    var trace = unitInfo.regions[1].traces[0];
-    assertTraceEntry(
-        unitInfo,
-        trace.entries[0],
-        'y',
-        unitInfo.content!.indexOf('int/*?*/? y'),
-        contains('y (test.dart:2:1)'));
-    assertTraceEntry(unitInfo, trace.entries[1], 'y',
-        unitInfo.content!.indexOf('= x;') + '= '.length, contains('data flow'));
-    expect(state!.hasBeenApplied, false);
-    expect(state!.needsRerun, true);
-  }
-}
diff --git a/pkg/nnbd_migration/test/preview/test_all.dart b/pkg/nnbd_migration/test/preview/test_all.dart
deleted file mode 100644
index e357e6d3d262..000000000000
--- a/pkg/nnbd_migration/test/preview/test_all.dart
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'preview_site_test.dart' as preview_site;
-
-void main() {
-  defineReflectiveSuite(() {
-    preview_site.main();
-  }, name: 'preview');
-}
diff --git a/pkg/nnbd_migration/test/test_all.dart b/pkg/nnbd_migration/test/test_all.dart
deleted file mode 100644
index c2f9b7fcba80..000000000000
--- a/pkg/nnbd_migration/test/test_all.dart
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'already_migrated_code_decorator_test.dart'
-    as already_migrated_code_decorator_test;
-import 'api_test.dart' as api_test;
-import 'decorated_class_hierarchy_test.dart' as decorated_class_hierarchy_test;
-import 'decorated_type_test.dart' as decorated_type_test;
-import 'edge_builder_flow_analysis_test.dart'
-    as edge_builder_flow_analysis_test;
-import 'edge_builder_test.dart' as edge_builder_test;
-import 'edit_plan_test.dart' as edit_plan_test;
-import 'edit_planner_pass_through_merging_test.dart'
-    as edit_planner_pass_through_merging_test;
-import 'fix_aggregator_test.dart' as fix_aggregator_test;
-import 'fix_builder_test.dart' as fix_builder_test;
-import 'fix_reason_target_test.dart' as fix_reason_target_test;
-import 'front_end/test_all.dart' as front_end;
-import 'instrumentation_test.dart' as instrumentation_test;
-import 'migration_cli_test.dart' as migration_cli_test;
-import 'node_builder_test.dart' as node_builder_test;
-import 'nullability_node_test.dart' as nullability_node_test;
-import 'preview/test_all.dart' as preview;
-import 'utilities/test_all.dart' as utilities;
-import 'variables_test.dart' as variables;
-import 'verify_tests_test.dart' as verify_tests;
-
-main() {
-  defineReflectiveSuite(() {
-    already_migrated_code_decorator_test.main();
-    api_test.main();
-    decorated_class_hierarchy_test.main();
-    decorated_type_test.main();
-    edge_builder_flow_analysis_test.main();
-    edge_builder_test.main();
-    edit_plan_test.main();
-    edit_planner_pass_through_merging_test.main();
-    fix_aggregator_test.main();
-    fix_builder_test.main();
-    fix_reason_target_test.main();
-    front_end.main();
-    instrumentation_test.main();
-    migration_cli_test.main();
-    node_builder_test.main();
-    nullability_node_test.main();
-    preview.main();
-    utilities.main();
-    variables.main();
-    verify_tests.main();
-  });
-}
diff --git a/pkg/nnbd_migration/test/utilities/multi_future_tracker_test.dart b/pkg/nnbd_migration/test/utilities/multi_future_tracker_test.dart
deleted file mode 100644
index 18d7c67ca9f1..000000000000
--- a/pkg/nnbd_migration/test/utilities/multi_future_tracker_test.dart
+++ /dev/null
@@ -1,87 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:async';
-
-import 'package:nnbd_migration/src/utilities/multi_future_tracker.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(MultiFutureTrackerTest);
-  });
-}
-
-@reflectiveTest
-class MultiFutureTrackerTest {
-  MultiFutureTracker? testTracker;
-
-  tearDown() {
-    // This will leak futures on certain kinds of test failures.  But it is
-    // a test, so we don't care.
-    testTracker = null;
-  }
-
-  Future test_doesNotBlockWithoutLimit() async {
-    var completer1 = Completer();
-
-    // Limit is set above the number of futures we are adding.
-    testTracker = MultiFutureTracker(10);
-    await testTracker!.addFutureFromClosure(() => completer1.future);
-    // The second future added should be executing even though the first
-    // future is not complete.  A test failure will time out.
-    await testTracker!.addFutureFromClosure(() async {
-      expect(completer1.isCompleted, isFalse);
-      completer1.complete();
-    });
-
-    return await testTracker!.wait();
-  }
-
-  Future test_multiFutureBlocksOnLimit() async {
-    var completer1 = Completer();
-
-    testTracker = MultiFutureTracker(1);
-    await testTracker!.addFutureFromClosure(() => completer1.future);
-    // The second future added shouldn't be executing until the first
-    // future is complete.
-    var secondInQueue = testTracker!.addFutureFromClosure(() async {
-      expect(completer1.isCompleted, isTrue);
-    });
-
-    completer1.complete();
-    await secondInQueue;
-    return await testTracker!.wait();
-  }
-
-  Future test_returnsValueFromRun() async {
-    testTracker = MultiFutureTracker(1);
-    await expectLater(await testTracker!.runFutureFromClosure(() async => true),
-        equals(true));
-    await expectLater(
-        await testTracker!.runFutureFromClosure(() => true), equals(true));
-  }
-
-  Future test_runsSeriallyAtLowLimit() async {
-    var completer1 = Completer();
-
-    testTracker = MultiFutureTracker(1);
-    var runFuture1 = testTracker!.runFutureFromClosure(() => completer1.future);
-    var runFuture2 = testTracker!.runFutureFromClosure(() => null);
-
-    // Both futures _should_ timeout.
-    await expectLater(runFuture1.timeout(Duration(milliseconds: 1)),
-        throwsA(TypeMatcher()));
-    await expectLater(runFuture2.timeout(Duration(milliseconds: 1)),
-        throwsA(TypeMatcher()));
-    expect(completer1.isCompleted, isFalse);
-
-    completer1.complete();
-
-    // Now, these should complete normally.
-    await runFuture1;
-    await runFuture2;
-  }
-}
diff --git a/pkg/nnbd_migration/test/utilities/scoped_set_test.dart b/pkg/nnbd_migration/test/utilities/scoped_set_test.dart
deleted file mode 100644
index edaab6b96879..000000000000
--- a/pkg/nnbd_migration/test/utilities/scoped_set_test.dart
+++ /dev/null
@@ -1,174 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/utilities/scoped_set.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(ScopedSetTest);
-  });
-}
-
-@reflectiveTest
-class ScopedSetTest {
-  test_clearEachScope() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.add(0);
-    set.pushScope(copyCurrent: true);
-    set.clearEachScope();
-    expect(set.isInScope(0), false);
-    set.popScope();
-    expect(set.isInScope(0), false);
-  }
-
-  test_doScoped_actionPerformed() {
-    final set = ScopedSet();
-    bool ran = false;
-    set.doScoped(action: () {
-      ran = true;
-    });
-    expect(ran, true);
-  }
-
-  test_doScoped_actionThrows() {
-    final set = ScopedSet();
-    bool? threw;
-    try {
-      set.doScoped(action: () {
-        set.add(0);
-        throw '';
-      });
-    } catch (_) {
-      threw = true;
-    }
-
-    expect(threw, true);
-    expect(set.isInScope(0), false);
-  }
-
-  test_doScoped_copyCurrent() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.add(0);
-    set.doScoped(
-        copyCurrent: true,
-        action: () {
-          set.add(1);
-          expect(set.isInScope(0), true);
-          expect(set.isInScope(1), true);
-        });
-    expect(set.isInScope(0), true);
-    expect(set.isInScope(1), false);
-  }
-
-  test_doScoped_elements() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.doScoped(
-        elements: [0, 1],
-        action: () {
-          expect(set.isInScope(0), true);
-          expect(set.isInScope(1), true);
-        });
-    expect(set.isInScope(0), false);
-    expect(set.isInScope(1), false);
-  }
-
-  test_doScoped_newScope() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.add(0);
-    set.doScoped(action: () {
-      set.add(1);
-      expect(set.isInScope(0), false);
-      expect(set.isInScope(1), true);
-    });
-    expect(set.isInScope(0), true);
-    expect(set.isInScope(1), false);
-  }
-
-  test_initiallyEmpty() {
-    final set = ScopedSet();
-    expect(set.isInScope(0), false);
-    expect(set.isInScope(1), false);
-  }
-
-  test_popScope_copyCurrent() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.add(0);
-    set.pushScope(copyCurrent: true);
-    set.popScope();
-    expect(set.isInScope(0), true);
-  }
-
-  test_popScope_element() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.add(0);
-    set.pushScope();
-    set.popScope();
-    expect(set.isInScope(0), true);
-  }
-
-  test_popScope_empty() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.pushScope();
-    set.add(0);
-    set.popScope();
-    expect(set.isInScope(0), false);
-  }
-
-  test_pushScope_add() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.add(0);
-    expect(set.isInScope(0), true);
-  }
-
-  test_pushScope_copyCurrent() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.add(0);
-    set.pushScope(copyCurrent: true);
-    expect(set.isInScope(0), true);
-  }
-
-  test_pushScope_empty() {
-    final set = ScopedSet();
-    set.pushScope();
-    expect(set.isInScope(0), false);
-  }
-
-  test_pushScope_empty2() {
-    final set = ScopedSet();
-    set.pushScope();
-    set.add(0);
-    set.pushScope();
-    expect(set.isInScope(0), false);
-  }
-
-  test_pushScope_withElements() {
-    final set = ScopedSet();
-    set.pushScope(elements: [0, 1]);
-    expect(set.isInScope(0), true);
-    expect(set.isInScope(1), true);
-  }
-
-  test_removeFromAllScopes() {
-    final set = ScopedSet();
-    set.pushScope(elements: [0, 1]);
-    set.pushScope(copyCurrent: true);
-    set.removeFromAllScopes(0);
-    expect(set.isInScope(0), false);
-    expect(set.isInScope(1), true);
-    set.popScope();
-    expect(set.isInScope(0), false);
-    expect(set.isInScope(1), true);
-  }
-}
diff --git a/pkg/nnbd_migration/test/utilities/source_edit_diff_formatter_test.dart b/pkg/nnbd_migration/test/utilities/source_edit_diff_formatter_test.dart
deleted file mode 100644
index 39cf3142074d..000000000000
--- a/pkg/nnbd_migration/test/utilities/source_edit_diff_formatter_test.dart
+++ /dev/null
@@ -1,255 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:cli_util/cli_logging.dart';
-import 'package:nnbd_migration/src/edit_plan.dart';
-import 'package:nnbd_migration/src/utilities/source_edit_diff_formatter.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(SourceEditDiffFormatterTest);
-  });
-}
-
-@reflectiveTest
-class SourceEditDiffFormatterTest {
-  DiffStyle get compactStyle => DiffStyle.forTesting(true);
-
-  DiffStyle get traditionalStyle => DiffStyle.forTesting(false);
-
-  test_ansi_supported() {
-    var ansi = Ansi(true);
-    expect(
-        DiffStyle(ansi).formatDiff('ab', {
-          0: [AtomicEdit.delete(1)],
-          2: [AtomicEdit.insert('c')]
-        }),
-        [
-          'line 1   • ${ansi.red}${ansi.reversed}a${ansi.none}'
-              'b${ansi.green}${ansi.reversed}c${ansi.none}'
-        ]);
-  }
-
-  test_ansi_unsupported() {
-    var ansi = Ansi(false);
-    expect(
-        DiffStyle(ansi).formatDiff('ab', {
-          0: [AtomicEdit.delete(1)],
-          2: [AtomicEdit.insert('c')]
-        }),
-        ['line 1   -ab', '         +bc']);
-  }
-
-  test_compact_consecutiveEdits() {
-    expect(
-        compactStyle.formatDiff('a', {
-          1: [AtomicEdit.insert('b'), AtomicEdit.insert('c')]
-        }),
-        ['line 1   * a{+b+}{+c+}']);
-  }
-
-  test_compact_deletion() {
-    expect(
-        compactStyle.formatDiff('abc', {
-          1: [AtomicEdit.delete(1)]
-        }),
-        ['line 1   * a{-b-}c']);
-  }
-
-  test_compact_deletion_ending_in_newline_at_line_start() {
-    expect(
-        compactStyle.formatDiff('abc\ndef', {
-          0: [AtomicEdit.delete(4)]
-        }),
-        ['line 1   * {-abc-}']);
-  }
-
-  test_compact_deletion_ending_in_newline_not_at_line_start() {
-    expect(
-        compactStyle.formatDiff('abc\ndef', {
-          1: [AtomicEdit.delete(3)]
-        }),
-        ['line 1   * a{-bc-}']);
-  }
-
-  test_compact_deletion_multiline() {
-    expect(
-        compactStyle.formatDiff('abc\ndef', {
-          1: [AtomicEdit.delete(5)]
-        }),
-        ['line 1   * a{-bc-}', 'line 2   * {-de-}f']);
-  }
-
-  test_compact_initialText() {
-    expect(
-        compactStyle.formatDiff('abc', {
-          3: [AtomicEdit.insert('d')]
-        }),
-        ['line 1   * abc{+d+}']);
-  }
-
-  test_compact_insertion() {
-    expect(
-        compactStyle.formatDiff('ac', {
-          1: [AtomicEdit.insert('b')]
-        }),
-        ['line 1   * a{+b+}c']);
-  }
-
-  test_compact_insertion_ending_in_newline() {
-    expect(
-        compactStyle.formatDiff('def', {
-          0: [AtomicEdit.insert('abc\n')]
-        }),
-        ['line 1   * {+abc+}']);
-  }
-
-  test_compact_insertion_multiline() {
-    expect(
-        compactStyle.formatDiff('af', {
-          1: [AtomicEdit.insert('bc\nde')]
-        }),
-        ['line 1   * a{+bc+}', '         * {+de+}f']);
-  }
-
-  test_compact_sort() {
-    expect(
-        compactStyle.formatDiff('b', {
-          1: [AtomicEdit.insert('c')],
-          0: [AtomicEdit.insert('a')]
-        }),
-        ['line 1   * {+a+}b{+c+}']);
-  }
-
-  test_compact_startsWithUnchangedLine() {
-    expect(
-        compactStyle.formatDiff('a\nb', {
-          3: [AtomicEdit.insert('c')]
-        }),
-        ['line 2   * b{+c+}']);
-  }
-
-  test_compact_trailingTextOnEditedLine_withFinalNewline() {
-    expect(
-        compactStyle.formatDiff('ac\n', {
-          1: [AtomicEdit.insert('b')]
-        }),
-        ['line 1   * a{+b+}c']);
-  }
-
-  test_compact_trailingTextOnEditedLine_withoutFinalNewline() {
-    expect(
-        compactStyle.formatDiff('ac', {
-          1: [AtomicEdit.insert('b')]
-        }),
-        ['line 1   * a{+b+}c']);
-  }
-
-  test_traditional_consecutiveEdits() {
-    expect(
-        traditionalStyle.formatDiff('a', {
-          1: [AtomicEdit.insert('b'), AtomicEdit.insert('c')]
-        }),
-        ['line 1   -a', '         +a{+b+}{+c+}']);
-  }
-
-  test_traditional_deletion() {
-    expect(
-        traditionalStyle.formatDiff('abc', {
-          1: [AtomicEdit.delete(1)]
-        }),
-        ['line 1   -a{-b-}c', '         +ac']);
-  }
-
-  test_traditional_deletion_ending_in_newline_at_line_start() {
-    expect(
-        traditionalStyle.formatDiff('abc\ndef', {
-          0: [AtomicEdit.delete(4)]
-        }),
-        ['line 1   -{-abc-}']);
-  }
-
-  test_traditional_deletion_ending_in_newline_not_at_line_start() {
-    expect(
-        traditionalStyle.formatDiff('abc\ndef', {
-          1: [AtomicEdit.delete(3)]
-        }),
-        ['line 1   -a{-bc-}', 'line 2   -def', '         +adef']);
-  }
-
-  test_traditional_deletion_multiline() {
-    expect(
-        traditionalStyle.formatDiff('abc\ndef', {
-          1: [AtomicEdit.delete(5)]
-        }),
-        ['line 1   -a{-bc-}', 'line 2   -{-de-}f', '         +af']);
-  }
-
-  test_traditional_initialText() {
-    expect(
-        traditionalStyle.formatDiff('abc', {
-          3: [AtomicEdit.insert('d')]
-        }),
-        ['line 1   -abc', '         +abc{+d+}']);
-  }
-
-  test_traditional_insertion() {
-    expect(
-        traditionalStyle.formatDiff('ac', {
-          1: [AtomicEdit.insert('b')]
-        }),
-        ['line 1   -ac', '         +a{+b+}c']);
-  }
-
-  test_traditional_insertion_ending_in_newline() {
-    expect(
-        traditionalStyle.formatDiff('def', {
-          0: [AtomicEdit.insert('abc\n')]
-        }),
-        ['line 1   +{+abc+}']);
-  }
-
-  test_traditional_insertion_multiline() {
-    expect(
-        traditionalStyle.formatDiff('af', {
-          1: [AtomicEdit.insert('bc\nde')]
-        }),
-        ['line 1   -af', '         +a{+bc+}', '         +{+de+}f']);
-  }
-
-  test_traditional_sort() {
-    expect(
-        traditionalStyle.formatDiff('b', {
-          1: [AtomicEdit.insert('c')],
-          0: [AtomicEdit.insert('a')]
-        }),
-        ['line 1   -b', '         +{+a+}b{+c+}']);
-  }
-
-  test_traditional_startsWithUnchangedLine() {
-    expect(
-        traditionalStyle.formatDiff('a\nb', {
-          3: [AtomicEdit.insert('c')]
-        }),
-        ['line 2   -b', '         +b{+c+}']);
-  }
-
-  test_traditional_trailingTextOnEditedLine_withFinalNewline() {
-    expect(
-        traditionalStyle.formatDiff('ac\n', {
-          1: [AtomicEdit.insert('b')]
-        }),
-        ['line 1   -ac', '         +a{+b+}c']);
-  }
-
-  test_traditional_trailingTextOnEditedLine_withoutFinalNewline() {
-    expect(
-        traditionalStyle.formatDiff('ac', {
-          1: [AtomicEdit.insert('b')]
-        }),
-        ['line 1   -ac', '         +a{+b+}c']);
-  }
-}
diff --git a/pkg/nnbd_migration/test/utilities/test_all.dart b/pkg/nnbd_migration/test/utilities/test_all.dart
deleted file mode 100644
index dc5758e38edc..000000000000
--- a/pkg/nnbd_migration/test/utilities/test_all.dart
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import 'multi_future_tracker_test.dart' as multi_future_tracker_test;
-import 'scoped_set_test.dart' as scoped_set_test;
-import 'source_edit_diff_formatter_test.dart'
-    as source_edit_diff_formatter_test;
-import 'where_not_null_transformer_test.dart'
-    as where_not_null_transformer_test;
-import 'where_or_null_transformer_test.dart' as where_or_null_transformer_test;
-
-main() {
-  defineReflectiveSuite(() {
-    multi_future_tracker_test.main();
-    scoped_set_test.main();
-    source_edit_diff_formatter_test.main();
-    where_not_null_transformer_test.main();
-    where_or_null_transformer_test.main();
-  });
-}
diff --git a/pkg/nnbd_migration/test/utilities/test_logger.dart b/pkg/nnbd_migration/test/utilities/test_logger.dart
deleted file mode 100644
index 67f73f9aa336..000000000000
--- a/pkg/nnbd_migration/test/utilities/test_logger.dart
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:cli_util/cli_logging.dart';
-
-/// TODO(paulberry): move into cli_util
-class TestLogger implements Logger {
-  final stderrBuffer = StringBuffer();
-
-  final stdoutBuffer = StringBuffer();
-
-  final bool isVerbose;
-
-  TestLogger(this.isVerbose);
-
-  @override
-  Ansi get ansi => Ansi(false);
-
-  @override
-  void flush() {}
-
-  @override
-  Progress progress(String message) {
-    return SimpleProgress(this, message);
-  }
-
-  @override
-  void stderr(String message) {
-    stderrBuffer.writeln(message);
-  }
-
-  @override
-  void stdout(String message) {
-    stdoutBuffer.writeln(message);
-  }
-
-  @override
-  void trace(String message) {
-    if (isVerbose) {
-      stdoutBuffer.writeln(message);
-    }
-  }
-
-  @override
-  void write(String message) {
-    stdoutBuffer.write(message);
-  }
-
-  @override
-  void writeCharCode(int charCode) {
-    stdoutBuffer.writeCharCode(charCode);
-  }
-}
diff --git a/pkg/nnbd_migration/test/utilities/where_not_null_transformer_test.dart b/pkg/nnbd_migration/test/utilities/where_not_null_transformer_test.dart
deleted file mode 100644
index a4e9f47fd793..000000000000
--- a/pkg/nnbd_migration/test/utilities/where_not_null_transformer_test.dart
+++ /dev/null
@@ -1,212 +0,0 @@
-// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/dart/element/type_system.dart';
-import 'package:nnbd_migration/src/utilities/where_not_null_transformer.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import '../abstract_single_unit.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(WhereNotNullTransformerTest);
-  });
-}
-
-@reflectiveTest
-class WhereNotNullTransformerTest extends AbstractSingleUnitTest {
-  late WhereNotNullTransformer transformer;
-
-  TypeProvider get typeProvider => testAnalysisResult.typeProvider;
-
-  TypeSystem get typeSystem => testAnalysisResult.typeSystem;
-
-  Future analyze(String code) async {
-    await resolveTestUnit(code);
-    transformer = WhereNotNullTransformer(typeProvider, typeSystem);
-  }
-
-  Future test_match() async {
-    await analyze('''
-f(List x) => x.where((i) => i != null);
-''');
-    var methodInvocation = findNode.methodInvocation('.where');
-    var transformationInfo =
-        transformer.tryTransformMethodInvocation(methodInvocation)!;
-    expect(transformationInfo, isNotNull);
-    expect(transformationInfo.methodInvocation, same(methodInvocation));
-    expect(transformationInfo.argument,
-        same(findNode.functionExpression('(i) => i != null')));
-    expect(transformationInfo.originalName, 'where');
-    expect(transformationInfo.replacementName, 'whereNotNull');
-  }
-
-  Future test_match_extended() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) => i != null);
-''');
-    var methodInvocation = findNode.methodInvocation('.where');
-    var transformationInfo =
-        transformer.tryTransformMethodInvocation(methodInvocation)!;
-    expect(transformationInfo, isNotNull);
-    expect(transformationInfo.methodInvocation, same(methodInvocation));
-    expect(transformationInfo.argument,
-        same(findNode.functionExpression('(i) => i != null')));
-    expect(transformationInfo.originalName, 'where');
-    expect(transformationInfo.replacementName, 'whereNotNull');
-  }
-
-  Future test_match_returns_subtype() async {
-    await analyze('''
-abstract class C implements Iterable {
-  List where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) => i != null);
-''');
-    var methodInvocation = findNode.methodInvocation('.where');
-    var transformationInfo =
-        transformer.tryTransformMethodInvocation(methodInvocation)!;
-    expect(transformationInfo, isNotNull);
-    expect(transformationInfo.methodInvocation, same(methodInvocation));
-    expect(transformationInfo.argument,
-        same(findNode.functionExpression('(i) => i != null')));
-    expect(transformationInfo.originalName, 'where');
-    expect(transformationInfo.replacementName, 'whereNotNull');
-  }
-
-  Future test_mismatch_closure_block_typed() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) { return i != null; });
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-
-  Future test_mismatch_closure_lhs_not_identifier() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) => 2*i != null);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-
-  Future test_mismatch_closure_lhs_wrong_element() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) => c != null);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-
-  Future test_mismatch_closure_non_binary_expression() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) => true);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-
-  Future test_mismatch_closure_wrong_operator() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) => i == null);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-
-  Future test_mismatch_extension_method() async {
-    await analyze('''
-extension on String {
-  Iterable where(bool test(int element)) => null;
-}
-f(String s) => s.where((i) => i != null);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-
-  Future test_mismatch_misnamed_method() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable fooBar(bool test(int element)) => null;
-}
-f(C c) => c.fooBar((i) => i != null);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.fooBar')),
-        isNull);
-  }
-
-  Future test_mismatch_not_a_subtype_of_iterable() async {
-    await analyze('''
-abstract class C {
-  Iterable where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) => i != null);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-
-  Future test_mismatch_rhs_not_null() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable where(bool test(int element)) => null;
-}
-f(C c) => c.where((i) => i != 0);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-
-  Future test_mismatch_too_many_arguments() async {
-    await analyze('''
-abstract class C implements Iterable {
-  Iterable where(bool test(int element), {int x}) => null;
-}
-f(C c) => c.where((i) => i != null, x: 0);
-''');
-    expect(
-        transformer
-            .tryTransformMethodInvocation(findNode.methodInvocation('.where')),
-        isNull);
-  }
-}
diff --git a/pkg/nnbd_migration/test/utilities/where_or_null_transformer_test.dart b/pkg/nnbd_migration/test/utilities/where_or_null_transformer_test.dart
deleted file mode 100644
index 748d373da887..000000000000
--- a/pkg/nnbd_migration/test/utilities/where_or_null_transformer_test.dart
+++ /dev/null
@@ -1,157 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/dart/element/type_provider.dart';
-import 'package:analyzer/dart/element/type_system.dart';
-import 'package:nnbd_migration/src/utilities/where_or_null_transformer.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-import '../abstract_single_unit.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(WhereOrNullTransformerTest);
-  });
-}
-
-@reflectiveTest
-class WhereOrNullTransformerTest extends AbstractSingleUnitTest {
-  late WhereOrNullTransformer transformer;
-
-  TypeProvider get typeProvider => testAnalysisResult.typeProvider;
-
-  TypeSystem get typeSystem => testAnalysisResult.typeSystem;
-
-  Future analyze(String code) async {
-    await resolveTestUnit(code);
-    transformer = WhereOrNullTransformer(typeProvider, typeSystem);
-  }
-
-  Future test_match() async {
-    await analyze('''
-f(List x) => x.firstWhere((i) => i.isEven, orElse: () => null);
-''');
-    var orElseExpression = findNode.functionExpression('() => null');
-    var transformationInfo =
-        transformer.tryTransformOrElseArgument(orElseExpression)!;
-    expect(transformationInfo, isNotNull);
-    expect(transformationInfo.methodInvocation,
-        same(findNode.methodInvocation('firstWhere')));
-    expect(transformationInfo.orElseArgument, same(orElseExpression.parent));
-    expect(transformationInfo.originalName, 'firstWhere');
-    expect(transformationInfo.replacementName, 'firstWhereOrNull');
-  }
-
-  Future test_match_extended() async {
-    await analyze('''
-abstract class C implements Iterable {
-  int firstWhere(bool test(int element), {int orElse()}) => null;
-}
-f(C c) => c.firstWhere((i) => i.isEven, orElse: () => null);
-''');
-    var orElseExpression = findNode.functionExpression('() => null');
-    var transformationInfo =
-        transformer.tryTransformOrElseArgument(orElseExpression)!;
-    expect(transformationInfo, isNotNull);
-    expect(transformationInfo.methodInvocation,
-        same(findNode.methodInvocation('firstWhere((')));
-    expect(transformationInfo.orElseArgument, same(orElseExpression.parent));
-    expect(transformationInfo.originalName, 'firstWhere');
-    expect(transformationInfo.replacementName, 'firstWhereOrNull');
-  }
-
-  Future test_mismatch_misnamed_method() async {
-    await analyze('''
-abstract class C extends Iterable {
-  int fooBar(bool test(int element), {int orElse()});
-}
-f(C c) => c.fooBar((i) => i.isEven, orElse: () => null);
-''');
-    expect(
-        transformer.tryTransformOrElseArgument(
-            findNode.functionExpression('() => null')),
-        isNull);
-  }
-
-  Future test_mismatch_orElse_expression() async {
-    await analyze('''
-f(List x) => x.firstWhere((i) => i.isEven, orElse: () => 0);
-''');
-    expect(
-        transformer
-            .tryTransformOrElseArgument(findNode.functionExpression('() => 0')),
-        isNull);
-  }
-
-  Future test_mismatch_orElse_name() async {
-    await analyze('''
-abstract class C extends Iterable {
-  @override
-  int firstWhere(bool test(int element), {int orElse(), int ifSo()});
-}
-f(C c) => c.firstWhere((i) => i.isEven, ifSo: () => null);
-''');
-    expect(
-        transformer.tryTransformOrElseArgument(
-            findNode.functionExpression('() => null')),
-        isNull);
-  }
-
-  Future test_mismatch_orElse_named_parameter() async {
-    await analyze('''
-f(List x) => x.firstWhere((i) => i.isEven, orElse: ({int x}) => null);
-''');
-    expect(
-        transformer.tryTransformOrElseArgument(
-            findNode.functionExpression(') => null')),
-        isNull);
-  }
-
-  Future test_mismatch_orElse_optional_parameter() async {
-    await analyze('''
-f(List x) => x.firstWhere((i) => i.isEven, orElse: ([int x]) => null);
-''');
-    expect(
-        transformer.tryTransformOrElseArgument(
-            findNode.functionExpression(') => null')),
-        isNull);
-  }
-
-  Future test_mismatch_orElse_presence_of_other_arg() async {
-    await analyze('''
-abstract class C extends Iterable {
-  @override
-  int firstWhere(bool test(int element), {int orElse(), int ifSo()});
-}
-f(C c) => c.firstWhere((i) => i.isEven, orElse: () => null, ifSo: () => null);
-''');
-    expect(
-        transformer.tryTransformOrElseArgument(
-            findNode.functionExpression('() => null,')),
-        isNull);
-  }
-
-  Future test_mismatch_other_subexpression() async {
-    await analyze('''
-List f(List x) => x;
-g(List x) => f(x).firstWhere((i) => i.isEven, orElse: () => null);
-''');
-    var xExpression = findNode.simple('x).firstWhere');
-    expect(transformer.tryTransformOrElseArgument(xExpression), isNull);
-  }
-
-  Future test_mismatch_unrelated_type() async {
-    await analyze('''
-abstract class C {
-  int firstWhere(bool test(int element), {int orElse()});
-}
-f(C c) => c.firstWhere((i) => i.isEven, orElse: () => null);
-''');
-    expect(
-        transformer.tryTransformOrElseArgument(
-            findNode.functionExpression('() => null')),
-        isNull);
-  }
-}
diff --git a/pkg/nnbd_migration/test/variables_test.dart b/pkg/nnbd_migration/test/variables_test.dart
deleted file mode 100644
index fd1e5103f729..000000000000
--- a/pkg/nnbd_migration/test/variables_test.dart
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:nnbd_migration/src/variables.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(_UniqueIdentifierForSpanTest);
-  });
-}
-
-@reflectiveTest
-class _UniqueIdentifierForSpanTest {
-  void test_inverse() {
-    const maxEnd = 1000;
-    for (int offset = 0; offset <= maxEnd; offset++) {
-      for (int end = offset; end <= maxEnd; end++) {
-        var uniqueId = Variables.uniqueIdentifierForSpan(offset, end);
-        var decoded = Variables.spanForUniqueIdentifier(uniqueId);
-        expect(decoded.offset, offset);
-        expect(decoded.end, end);
-      }
-    }
-  }
-
-  void test_uniqueness() {
-    const maxEnd = 1000;
-    const maxExpectedId = maxEnd * maxEnd;
-    var idsSeen = {};
-    for (int offset = 0; offset <= maxEnd; offset++) {
-      for (int end = offset; end <= maxEnd; end++) {
-        var pairDescription = '($offset, $end)';
-        var uniqueId = Variables.uniqueIdentifierForSpan(offset, end);
-        expect(uniqueId, lessThanOrEqualTo(maxExpectedId));
-        var previousUseOfThisId = idsSeen[uniqueId];
-        expect(previousUseOfThisId, isNull,
-            reason:
-                '$pairDescription maps to $uniqueId, which was previously used '
-                'by $previousUseOfThisId');
-        idsSeen[uniqueId] = pairDescription;
-      }
-    }
-  }
-}
diff --git a/pkg/nnbd_migration/test/verify_tests_test.dart b/pkg/nnbd_migration/test/verify_tests_test.dart
deleted file mode 100644
index cd08ec6b88ea..000000000000
--- a/pkg/nnbd_migration/test/verify_tests_test.dart
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:analyzer/file_system/physical_file_system.dart';
-import 'package:analyzer_utilities/package_root.dart' as package_root;
-import 'package:analyzer_utilities/verify_tests.dart';
-
-void main() {
-  var provider = PhysicalResourceProvider.INSTANCE;
-  var packageRoot = provider.pathContext.normalize(package_root.packageRoot);
-  var pathToAnalyze = provider.pathContext.join(packageRoot, 'nnbd_migration');
-  var testDirPath = provider.pathContext.join(pathToAnalyze, 'test');
-  VerifyTests(testDirPath).build();
-}
diff --git a/pkg/nnbd_migration/tool/codegen/assemble_resources.dart b/pkg/nnbd_migration/tool/codegen/assemble_resources.dart
deleted file mode 100644
index 27fa5dcb7eab..000000000000
--- a/pkg/nnbd_migration/tool/codegen/assemble_resources.dart
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// This script provides an alternative way of creating the
-// lib/src/front_end/resources/resources.g.dart file, based on a set of provided
-// files that has already been suitably compiled.
-
-import 'dart:io';
-
-import 'package:args/args.dart';
-
-import 'generate_resources.dart';
-
-main(List args) {
-  var argParser = ArgParser()
-    ..addOption('output', abbr: 'o', help: 'Output to FILE', valueHelp: 'FILE')
-    ..addFlag('help', abbr: 'h', negatable: false, help: 'Show help');
-  var parsedArgs = argParser.parse(args);
-  if (parsedArgs['help'] as bool) {
-    print('Usage: dart assemble_resources.dart INPUT_FILES');
-    print('');
-    print(argParser.usage);
-    exit(1);
-  }
-  var content =
-      generateResourceFile([for (var arg in parsedArgs.rest) File(arg)]);
-  var output = parsedArgs['output'] as String?;
-  if (output == null) {
-    stdout.write(content);
-  } else {
-    File(output).writeAsStringSync(content);
-  }
-}
diff --git a/pkg/nnbd_migration/tool/codegen/check_generated_test.dart b/pkg/nnbd_migration/tool/codegen/check_generated_test.dart
deleted file mode 100644
index 9a251ab8be33..000000000000
--- a/pkg/nnbd_migration/tool/codegen/check_generated_test.dart
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:test/test.dart';
-
-import 'generate_resources.dart' as generate_resources;
-
-/// Validate that the
-/// pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart
-/// file was regenerated after changing upstream dependencies.
-void main() async {
-  test('description', () {
-    generate_resources.verifyResourcesGDartGenerated(failVerification: fail);
-  });
-}
diff --git a/pkg/nnbd_migration/tool/codegen/extract_resource.dart b/pkg/nnbd_migration/tool/codegen/extract_resource.dart
deleted file mode 100644
index 486fbc4aa363..000000000000
--- a/pkg/nnbd_migration/tool/codegen/extract_resource.dart
+++ /dev/null
@@ -1,128 +0,0 @@
-// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// This script provides a quick way, via the command line, to extract one of the
-// resources encoded in the file lib/src/front_end/resources/resources.g.dart.
-
-import 'dart:convert';
-import 'dart:io';
-import 'dart:typed_data';
-
-import 'package:analyzer/dart/analysis/utilities.dart';
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:args/args.dart';
-import 'package:path/path.dart' as path;
-
-main(List args) {
-  var argResults = argParser.parse(args);
-  if (argResults['help'] as bool) {
-    fail(null, showUsage: true);
-  }
-  if (argResults.rest.isNotEmpty) {
-    fail('Unexpected extra arguments', showUsage: true);
-  }
-  bool list = argResults['list'] as bool;
-  String? path = argResults['path'] as String?;
-  String? resource = argResults['resource'] as String?;
-  if (list && resource != null) {
-    fail('Only one of --resource and --list may be provided');
-  } else if (!list && resource == null) {
-    fail('Either --resource or --list must be provided');
-  }
-  var file = locateResourcesFile(path);
-  var parseResult =
-      parseString(content: file.readAsStringSync(), path: file.path);
-  final variableNameRegExp = RegExp(r'^_(.*)_base64$');
-  for (var declaration in parseResult.unit.declarations) {
-    if (declaration is TopLevelVariableDeclaration) {
-      for (var variable in declaration.variables.variables) {
-        if (variable.initializer == null) continue;
-        var match = variableNameRegExp.matchAsPrefix(variable.name.lexeme);
-        if (match == null) continue;
-        var shortName = match.group(1);
-        if (list) {
-          stdout.writeln(shortName);
-        } else if (resource == shortName) {
-          stdout.add(decodeVariableDeclaration(variable));
-          return;
-        }
-      }
-    }
-  }
-  if (list) {
-    return;
-  } else {
-    fail('Resource $resource not found in ${file.path}');
-  }
-}
-
-final argParser = ArgParser()
-  ..addOption('resource',
-      abbr: 'r', valueHelp: 'RESOURCE', help: 'Extract resource RESOURCE')
-  ..addFlag('list',
-      negatable: false, abbr: 'l', help: 'List which resources are present')
-  ..addOption('path',
-      abbr: 'p',
-      valueHelp: 'PATH',
-      help:
-          'Search for resources.g.dart inside PATH rather than current working '
-          'directory')
-  ..addFlag('help', negatable: false, abbr: 'h');
-
-Uint8List decodeVariableDeclaration(VariableDeclaration variable) {
-  var initializer = variable.initializer as StringLiteral;
-  var stringValue = initializer.stringValue!;
-  return base64.decode(stringValue.replaceAll('\n', '').trim());
-}
-
-void fail(String? message, {bool showUsage = false}) {
-  if (message != null) {
-    stderr.writeln(message);
-  }
-  if (showUsage) {
-    stderr.writeln('''
-usage: dart pkg/nnbd_migration/tool/codegen/extract_resource.dart -r 
-
-Reads the file `resources.g.dart` from the appropriate directory, extracts the
-embedded resource named ``, and prints it to standard out.
-''');
-    stderr.writeln(argParser.usage);
-  }
-  exit(1);
-}
-
-/// Tries to guess the location of `resources.g.dart` using optional [pathHint]
-/// as a starting point.
-File locateResourcesFile(String? pathHint) {
-  pathHint ??= '.';
-  final pathParts =
-      'pkg/nnbd_migration/lib/src/front_end/resources/resources.g.dart'
-          .split('/');
-  var currentPath = path.normalize(pathHint);
-  while (true) {
-    for (int i = 0; i <= pathParts.length; i++) {
-      var pathToTry = path.normalize(path.join(
-          currentPath, path.joinAll(pathParts.sublist(pathParts.length - i))));
-      var file = File(pathToTry);
-      var type = file.statSync().type;
-      if (type == FileSystemEntityType.notFound && i == 0) {
-        fail('No such file or directory: $pathToTry');
-      }
-      if (type == FileSystemEntityType.link) {
-        type = File(file.resolveSymbolicLinksSync()).statSync().type;
-      }
-      if (type == FileSystemEntityType.file) {
-        return file;
-      }
-    }
-    if (currentPath == '.') {
-      currentPath = Directory.current.path;
-    }
-    var nextPath = path.dirname(currentPath);
-    if (nextPath == currentPath) {
-      fail('Could not find file `resources.g.dart` starting at $pathHint');
-    }
-    currentPath = nextPath;
-  }
-}
diff --git a/pkg/nnbd_migration/tool/codegen/generate_resources.dart b/pkg/nnbd_migration/tool/codegen/generate_resources.dart
deleted file mode 100644
index 7caf5f44115c..000000000000
--- a/pkg/nnbd_migration/tool/codegen/generate_resources.dart
+++ /dev/null
@@ -1,284 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// This script generates the
-// lib/src/front_end/resources/resources.g.dart file from the contents
-// of the lib/src/front_end/resources directory.
-
-import 'dart:convert';
-import 'dart:io';
-import 'dart:math' as math;
-
-import 'package:args/args.dart';
-import 'package:crypto/crypto.dart';
-import 'package:path/path.dart' as path;
-
-void main(List args) async {
-  var argParser = ArgParser()
-    ..addFlag('verify', negatable: false)
-    ..addFlag('dev', negatable: false)
-    ..addOption('dart_path')
-    ..addFlag('help', negatable: false);
-  var argResults = argParser.parse(args);
-  if (argResults['help'] == true) {
-    fail('''
-usage: dart pkg/nnbd_migration/tool/codegen/generate_resources.dart [--verify]
-
-Run with no args to generate web resources for the NNBD migration preview tool.
-Run with '--verify' to validate that the web resource have been regenerated.
-''');
-  }
-
-  if (FileSystemEntity.isFileSync(
-      path.join('tool', 'codegen', 'generate_resources.dart'))) {
-    // We're running from the project root - cd up two directories.
-    Directory.current = Directory.current.parent.parent;
-  } else if (!FileSystemEntity.isDirectorySync(
-      path.join('pkg', 'nnbd_migration'))) {
-    fail('Please run this tool from the root of the sdk repo.');
-  }
-
-  bool verify = argResults['verify'] as bool;
-  bool? dev = argResults['dev'] as bool?;
-
-  if (verify) {
-    verifyResourcesGDartGenerated();
-  } else {
-    await compileWebFrontEnd(devMode: dev!, dartPath: dartPath(argResults)!);
-
-    print('');
-
-    createResourcesGDart();
-  }
-}
-
-final File dartSources = File(path.join('pkg', 'nnbd_migration', 'lib', 'src',
-    'front_end', 'web', 'migration.dart'));
-
-final javascriptOutput = File(path.join('pkg', 'nnbd_migration', 'lib', 'src',
-    'front_end', 'resources', 'migration.js'));
-
-final Directory resourceDir = Directory(
-    path.join('pkg', 'nnbd_migration', 'lib', 'src', 'front_end', 'resources'));
-
-final File resourcesFile = File(path.join('pkg', 'nnbd_migration', 'lib', 'src',
-    'front_end', 'resources', 'resources.g.dart'));
-
-final List resourceTypes = [
-  '.css',
-  '.html',
-  '.js',
-  '.png',
-  '.ttf',
-];
-
-String base64Encode(List bytes) {
-  var encoded = base64.encode(bytes);
-
-  // Logic to cut lines into 80-character chunks.
-  var lines = [];
-  var index = 0;
-
-  while (index < encoded.length) {
-    var line = encoded.substring(index, math.min(index + 80, encoded.length));
-    lines.add(line);
-    index += line.length;
-  }
-
-  return lines.join('\n');
-}
-
-Future compileWebFrontEnd(
-    {required bool devMode, required String dartPath}) async {
-  // dart compile js -m -o output source
-  var process = await Process.start(dartPath, [
-    'compile',
-    'js',
-    devMode ? '-O1' : '-m',
-    '--no-frequency-based-minification',
-    '-o',
-    javascriptOutput.path,
-    dartSources.path,
-  ]);
-  process.stdout.listen((List data) => stdout.add(data));
-  process.stderr.listen((List data) => stderr.add(data));
-  var exitCode = await process.exitCode;
-
-  if (exitCode != 0) {
-    fail('Failed compiling ${dartSources.path}.');
-  }
-}
-
-void createResourcesGDart() {
-  var content = generateResourceFile(
-      sortDir(resourceDir.listSync()).where((entity) {
-        var name = path.basename(entity.path);
-        return entity is File && resourceTypes.contains(path.extension(name));
-      }).cast(),
-      sourcesMd5: _computeSourcesMd5());
-
-  // write the content
-  resourcesFile.writeAsStringSync(content);
-}
-
-/// Returns the dartPath, either from [argResults] or the Platform.
-String? dartPath(ArgResults argResults) {
-  if (argResults.wasParsed('dart_path')) {
-    return argResults['dart_path'] as String?;
-  } else {
-    return Platform.resolvedExecutable;
-  }
-}
-
-void fail(String message) {
-  stderr.writeln(message);
-  exit(1);
-}
-
-/// Fail the script, and print out a message indicating how to regenerate the
-/// resources file.
-void failGenerate(String message) {
-  stderr.writeln('$message.');
-  stderr.writeln();
-  stderr.writeln('''
-To re-generate lib/src/front_end/resources/resources.g.dart, run:
-
-  dart pkg/nnbd_migration/tool/codegen/generate_resources.dart
-''');
-  exit(1);
-}
-
-String generateResourceFile(Iterable resources, {String? sourcesMd5}) {
-  var filePath = path.relative(Platform.script.toFilePath());
-  var buf = StringBuffer('''
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// This file is generated; don't edit it directly.
-//
-// See $filePath for how
-// to edit the source content and for re-generation instructions.
-
-import 'dart:convert' as convert;
-''');
-
-  for (var resource in resources) {
-    var name = path.basename(resource.path).replaceAll('.', '_');
-    print('adding $name...');
-
-    buf.writeln();
-    buf.writeln('String get $name {');
-    buf.writeln('  return _$name ??= _decode(_${name}_base64);');
-    buf.writeln('}');
-  }
-
-  buf.writeln(r'''
-
-String _decode(String data) {
-  data = data.replaceAll('\n', '').trim();
-  return String.fromCharCodes(convert.base64Decode(data));
-}''');
-
-  for (var resource in resources) {
-    var name = path.basename(resource.path).replaceAll('.', '_');
-
-    String source;
-    var extension = path.extension(resource.path);
-    if (extension == '.png' || extension == '.ttf') {
-      source = resource.readAsStringSync(encoding: latin1);
-    } else {
-      source = resource.readAsStringSync();
-    }
-
-    var delimiter = "'''";
-
-    buf.writeln();
-    buf.writeln('String? _$name;');
-    if (sourcesMd5 != null &&
-        name == path.basename(javascriptOutput.path).replaceAll('.', '_')) {
-      // Write out the crc for the dart code.
-      buf.writeln("// migration_dart md5 is '$sourcesMd5'");
-    } else {
-      // highlight_css md5 is 'fb012626bafd286510d32da815dae448'
-      buf.writeln("// $name md5 is '${md5String(source)}'");
-    }
-    buf.writeln('String _${name}_base64 = $delimiter');
-    buf.writeln(base64Encode(source.codeUnits));
-    buf.writeln('$delimiter;');
-  }
-
-  return buf.toString();
-}
-
-String md5String(String str) {
-  return md5.convert(str.codeUnits).toString();
-}
-
-List sortDir(Iterable entities) {
-  var result = entities.toList();
-  result.sort((a, b) => a.path.compareTo(b.path));
-  return result;
-}
-
-void verifyResourcesGDartGenerated({
-  VerificationFunction failVerification = failGenerate,
-}) {
-  print('Verifying that ${path.basename(resourcesFile.path)} is up-to-date...');
-
-  // Find the hashes for the last generated version of resources.g.dart.
-  var resourceHashes = {};
-  // highlight_css md5 is 'fb012626bafd286510d32da815dae448'
-  var hashPattern = RegExp(r"// (\S+) md5 is '(\S+)'");
-  for (var match in hashPattern.allMatches(resourcesFile.readAsStringSync())) {
-    resourceHashes[match.group(1)] = match.group(2);
-  }
-
-  // For all resources (modulo compiled JS ones), verify the hash.
-  for (var entity in sortDir(resourceDir.listSync())) {
-    var name = path.basename(entity.path);
-    if (!resourceTypes.contains(path.extension(name))) {
-      continue;
-    }
-
-    if (name == 'migration.js' ||
-        name == 'dart_192.png' ||
-        path.extension(name) == '.ttf') {
-      // skip the compiled js and logo
-      continue;
-    }
-
-    var key = name.replaceAll('.', '_');
-    if (!resourceHashes.containsKey(key)) {
-      failVerification('No entry on resources.g.dart for $name');
-    } else {
-      var hash = md5String((entity as File).readAsStringSync());
-      if (hash != resourceHashes[key]) {
-        failVerification('$name not up to date in resources.g.dart');
-      }
-    }
-  }
-
-  // verify the compiled dart code
-  String hash = _computeSourcesMd5();
-  if (hash != resourceHashes['migration_dart']) {
-    failVerification('Compiled javascript not up to date in resources.g.dart');
-  }
-
-  print('Generated resources up to date.');
-}
-
-String _computeSourcesMd5() {
-  var sourceCode = StringBuffer();
-  // collect the dart source code
-  for (var entity in sortDir(dartSources.parent.listSync())) {
-    if (entity.path.endsWith('.dart')) {
-      sourceCode.write((entity as File).readAsStringSync());
-    }
-  }
-  var sourcesMd5 = md5String(sourceCode.toString());
-  return sourcesMd5;
-}
-
-typedef VerificationFunction = void Function(String);
diff --git a/pkg/nnbd_migration/tool/steamroll_ecosystem.sh b/pkg/nnbd_migration/tool/steamroll_ecosystem.sh
deleted file mode 100755
index 0c6374b0bb3c..000000000000
--- a/pkg/nnbd_migration/tool/steamroll_ecosystem.sh
+++ /dev/null
@@ -1,450 +0,0 @@
-#!/usr/bin/env bash
-#
-# Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-#
-
-set -ex
-
-#
-# Build a workspace component from a package.
-#
-# $1: the name of the package
-# $2: the name of the repository (same as package if missing)
-# $3: branch to clone from (master if missing).  Do not select multiple
-#     different branches for the same repo, that
-#     will not work and is not enforced.
-# $4: subdirectory of the repository applicable to the package (root if missing)
-function make_clone_from_package {
-  local package_name="$1"
-  local repo_name="$2"
-  local branch="$3"
-  local subdir="$4"
-
-  [ -z "${repo_name}" ] && repo_name=${package_name}
-  [ -z "${branch}" ] && branch=master
-  [ -z "${subdir}" ] && subdir=.
-
-  add_repo_to_workspace "${repo_name}" "${branch}"
-  ln -sfn "_repos/${repo_name}/${subdir}" "${package_name}"
-
-  grep -v "^${package_name}:file://" .packages >> .packages.new || true
-  echo "${package_name}:file://$(pwd)/$(readlink ${package_name})/lib" \
-    >> .packages.new
-  mv .packages.new .packages
-}
-
-# HACK ALERT: no associative arrays in bash 3 and eval is a bad idea.  Use
-# files instead.  :-(
-repos_changed_this_run="`mktemp`"
-done_this_run="`mktemp`"
-trap _cleanup EXIT
-function _cleanup {
-  rm -f "${done_this_run}" "${repos_changed_this_run}"
-}
-
-# Returns true if we have already processed this repository or package.
-#
-# Repository names are prefixed with "_repos/", package names are plain.
-#
-# $1: repository or package name
-function already_done_this_run {
-  grep -q "^$1$" "${done_this_run}"
-  return $?
-}
-
-# Adds the parameter to the run log file.
-#
-# $1: package name, or repository name prefixed with '_repos/'.
-function log_this_run {
-  echo "$1" >> "${done_this_run}"
-}
-
-# Returns true if when pulling this repository it changed.
-#
-# Unlike `already_done_this_run`, repository names are plain.
-#
-# $1: repository name
-function repo_changed_this_run {
-  grep -q "^$1$" "${repos_changed_this_run}"
-  return $?
-}
-
-# Adds the parameter to the repository changed log.
-#
-# $1: repository name
-function log_repo_changed_this_run {
-  echo "$1" >> "${repos_changed_this_run}"
-}
-
-
-function _pull_into_repo {
-  local branch="$1"
-  local revision="$2"
-  local sparse_param
-
-  if [ "${branch}" == "master" ] ; then
-    sparse_param=--depth=1
-  fi
-
-  [ -z "${revision}" ] && revision="${branch}"
-
-  git pull ${sparse_param} --rebase originHTTP "${revision}"
-}
-
-#
-# Add a git repository to the workspace.
-#
-# $1: the name of the repository
-# $2: branch to clone from
-# $3: revision to check out, or leave at HEAD if empty.  We can't use sparse
-#     clones in this case.
-function add_repo_to_workspace {
-  local repo_name="$1"
-  local branch="$2"
-  local revision
-  local clone
-
-  local curr_head
-  local prev_head
-
-  if already_done_this_run "_repos/${repo_name}" ; then return 0 ; fi
-  log_this_run "_repos/${repo_name}"
-
-  case "${repo_name}" in
-    archive) clone="git@github.com:brendan-duncan/${repo_name}.git" ;;
-    build_verify) clone="git@github.com:kevmoo/${repo_name}.git" ;;
-    build_version) clone="git@github.com:kevmoo/${repo_name}.git" ;;
-    csv) clone="git@github.com:close2/csv.git" ;;
-    git) clone="git@github.com:kevmoo/${repo_name}.git" ;;
-    node-interop) clone="git@github.com:pulyaevskiy/node-interop.git" ;;
-    node_preamble) clone="git@github.com:mbullington/${repo_name}.dart.git" ;;
-    package_config)
-      clone="git@github.com:dart-lang/${repo_name}.git"
-      revision=1.1.0
-      ;;
-    source_gen_test) clone="git@github.com:kevmoo/${repo_name}.git" ;;
-    quiver-dart) clone="git@github.com:google/${repo_name}.git" ;;
-    uuid) clone="git@github.com:Daegalus/dart-uuid.git" ;;
-    *.dart) clone="git@github.com:google/${repo_name}" ;;
-    *)
-      clone="git@github.com:dart-lang/${repo_name}.git"
-      echo "WARNING: using default for ${repo_name}, this might not work"
-    ;;
-  esac
-
-  if [ -d "_repos/${repo_name}" ] ; then
-    pushd "_repos/${repo_name}"
-    prev_head="$(git rev-parse HEAD)"
-    ${NO_UPDATE} _pull_into_repo "${branch}" "${revision}"
-    curr_head="$(git rev-parse HEAD)"
-    if [ "${prev_head}" != "${curr_head}" ] ; then
-      log_repo_changed_this_run "${repo_name}"
-    fi
-    git checkout -b "${branch}"
-    popd
-    return $?
-  fi
-
-  mkdir -p _repos
-  pushd "_repos"
-  git init "${repo_name}"
-  pushd "${repo_name}"
-  git remote add "origin" -t "${branch}" "${clone}"
-  # Use HTTP for pulls to reduce authentication overhead and excessive pressing
-  # of authentication tokens.  This means we might be prompted for
-  # username/password if a package does not exist, but that's
-  # the tradeoff.
-  git remote add "originHTTP" -t "${branch}" \
-    $(echo "${clone}" | sed s,^git@github.com:,https://github.com/,g)
-  git config core.sparsecheckout true
-  echo "**" >> .git/info/sparse-checkout
-  echo "!**/.packages" >> .git/info/sparse-checkout
-  echo "!**/pubspec.lock" >> .git/info/sparse-checkout
-  echo "!**/.dart_tool/package_config.json" >> .git/info/sparse-checkout
-  # TODO(jcollins-g): Usual bag of tricks does not work to stop git pull from
-  # prompting and force it to hard fail if authentication is required.  Why?
-  if ! _pull_into_repo ${branch} ${revision} ; then
-    echo error cloning: "${clone}".  Cleaning up
-    popd
-    # We remove the repository here so that if you're iteratively adding new
-    # repository configurations, a rerun of the script will re-initialize the
-    # misconfigured repository.
-    rm -rf "${repo_name}"
-    popd
-    return 2
-  fi
-  log_repo_changed_this_run "${repo_name}"
-  popd
-  popd
-}
-
-
-# Tries pub get multiple times since it occasionally fails.
-# Returns false if we ran out of retries.
-function pub_get_with_retries {
-  for try in 1 2 3 4 5 ; do
-    if pub get --no-precompile ; then return 0 ; fi
-    sleep $[$try * $try]
-  done
-  return 1
-}
-
-#
-# Puts to stdout a list of the package names for the dependencies of a package.
-#
-# Uses pub (super slow).
-#
-# $1: directory name
-function generate_package_names_with_pub {
-  local directory_name="$1"
-  if [ -n "${ONE_PUB_ONLY}" ] && [ "${ONE_PUB_ONLY}" != "$1" ] ; then
-    return 0
-  fi
-  [ -z "${directory_name}" ] && directory_name=.
-  pushd "${directory_name}" >/dev/null
-  pub_get_with_retries >/dev/null
-  popd >/dev/null
-  # HACK ALERT: assumes '.pub-cache' is in the path of the real pub cache.
-  # Packages referring to other packages via path in pubspec.yaml are not
-  # supported at all and we do not include dependencies derived that way
-  # exclusively.
-  grep -v '^#' "${directory_name}/.packages" | grep '.pub-cache' | cut -f 1 -d :
-}
-
-# Returns true if we can use yq, or false if there is a path package dependency.
-function _can_use_yq {
-  for k in dependencies dev_dependencies ; do
-    if yq r "$1/pubspec.yaml" "${k}.*.path" | egrep -q -v '^(- null|null)$' ; then
-      return 1
-    fi
-  done
-  return 0
-}
-
-# Prints package and version number, one per line, to stdout.
-function _generate_yq_helper {
-  yq r "$1/pubspec.yaml" dependencies | egrep '^\w+:' | sed 's/:/ /'
-  yq r "$1/pubspec.yaml" dev_dependencies | egrep '^\w+:' | sed 's/:/ /'
-}
-
-#
-# Puts to stdout a list of the package names for the dependencies of a package.
-#
-# Parses yaml (fast), but requires the 'yq' program.
-#
-# $1: directory name
-function generate_package_names_with_yq {
-  local directory_name="$1"
-  local package
-  local version
-  if _can_use_yq "${directory_name}" ; then
-    _generate_yq_helper "${directory_name}" | while read package version ; do
-      if [ ! -z "${version}" ] ; then
-        echo "${package}"
-      else
-        echo "assert: should have a version number or we should have used pub" >&2
-        return 1
-      fi
-    done
-  else
-    generate_package_names_with_pub "${directory_name}"
-  fi
-}
-
-#
-# Add a package, recursively, to the workspace.  A package may add its own
-# repository, or use an existing one.
-#
-# $1: the package name.  Must be one of the packages we know the location of.
-#
-function add_package_to_workspace {
-  local package_name="$1"
-
-  if already_done_this_run "${package_name}" ; then return 0 ; fi
-  log_this_run "${package_name}"
-
-  if [ -d "${package_name}" ] ; then {
-    pushd "${package_name}"
-    prev_head="$(git rev-parse HEAD)"
-    popd
-  } ; fi
-
-  local repo
-
-  case "${package_name}" in
-    _fe_analyzer_shared) repo=sdk
-      make_clone_from_package _fe_analyzer_shared "${repo}" master pkg/_fe_analyzer_shared ;;
-    analyzer_utilities) repo=sdk
-      make_clone_from_package analyzer_utilities "${repo}" master pkg/analyzer_utilities ;;
-    analyzer) repo=sdk
-      make_clone_from_package analyzer "${repo}" master pkg/analyzer ;;
-    build) repo=build
-      make_clone_from_package build "${repo}" master build ;;
-    build_config) repo=build
-      make_clone_from_package build_config "${repo}" master build_config ;;
-    build_daemon) repo=build
-      make_clone_from_package build_daemon "${repo}" master build_daemon ;;
-    build_integration) repo=sdk
-      make_clone_from_package build_integration "${repo}" master pkg/build_integration ;;
-    build_modules) repo=build
-      make_clone_from_package build_modules "${repo}" master build_modules ;;
-    build_node_compilers) repo=node-interop
-      make_clone_from_package build_node_compilers "${repo}" master build_node_compilers ;;
-    build_resolvers) repo=build
-      make_clone_from_package build_resolvers "${repo}" master build_resolvers ;;
-    build_runner) repo=build
-      make_clone_from_package build_runner "${repo}" master build_runner ;;
-    build_runner_core) repo=build
-      make_clone_from_package build_runner_core "${repo}" master build_runner_core;;
-    build_test) repo=build
-      make_clone_from_package build_test "${repo}" master build_test ;;
-    build_vm_compilers) repo=build
-      make_clone_from_package build_vm_compilers "${repo}" master build_vm_compilers ;;
-    build_web_compilers) repo=build
-      make_clone_from_package build_web_compilers "${repo}" master build_web_compilers ;;
-    built_collection) repo=built_collection.dart
-      make_clone_from_package built_collection "${repo}" ;;
-    built_value) repo=built_value.dart
-      make_clone_from_package built_value "${repo}" master built_value ;;
-    built_value_generator) repo=built_value.dart
-      make_clone_from_package built_value_generator "${repo}" master built_value_generator ;;
-    checked_yaml) repo=json_serializable
-      make_clone_from_package checked_yaml "${repo}" master checked_yaml ;;
-    expect) repo=sdk
-      make_clone_from_package expect "${repo}" master pkg/expect ;;
-    front_end) repo=sdk
-      make_clone_from_package front_end "${repo}" master pkg/front_end ;;
-    grinder) repo=grinder.dart
-      make_clone_from_package grinder "${repo}" ;;
-    kernel) repo=sdk
-      make_clone_from_package kernel "${repo}" master pkg/kernel ;;
-    meta) repo=sdk
-      make_clone_from_package meta "${repo}" master pkg/meta ;;
-    node_interop) repo=node-interop
-      make_clone_from_package node_interop "${repo}" master node_interop ;;
-    node_io) repo=node-interop
-      make_clone_from_package node_io "${repo}" master node_io ;;
-    js) repo=sdk
-      make_clone_from_package js "${repo}" master pkg/js ;;
-    json_annotation) repo=json_serializable
-      make_clone_from_package json_annotation "${repo}" master json_annotation ;;
-    json_serializable) repo=json_serializable
-      make_clone_from_package json_serializable "${repo}" master json_serializable ;;
-    package_config) repo=package_config
-      # TODO(jcollins-g): remove pin after https://github.com/dart-lang/sdk/issues/40208
-      make_clone_from_package package_config "${repo}" 2453cd2e78c2db56ee2669ced17ce70dd00bf576 ;;
-    protobuf) repo=protobuf
-      make_clone_from_package protobuf "${repo}" master protobuf ;;
-    scratch_space) repo=build
-      make_clone_from_package scratch_space "${repo}" master scratch_space ;;
-    source_gen) repo=source_gen
-      make_clone_from_package source_gen "${repo}" master source_gen ;;
-    source_gen_test) repo=source_gen_test
-      make_clone_from_package source_gen_test "${repo}" ;;
-    test) repo=test
-      make_clone_from_package test "${repo}" master pkgs/test ;;
-    test_api) repo=test
-      make_clone_from_package test_api "${repo}" master pkgs/test_api ;;
-    test_core) repo=test
-      make_clone_from_package test_core "${repo}" master pkgs/test_core ;;
-    testing) repo=sdk
-      make_clone_from_package testing "${repo}" master pkg/testing ;;
-    vm_service) repo=sdk
-      make_clone_from_package vm_service "${repo}" master pkg/vm_service ;;
-    quiver) repo=quiver-dart
-      make_clone_from_package quiver "${repo}" ;;
-    *) repo="${package_name}"
-      make_clone_from_package "${package_name}" ;;
-  esac
-
-  # Use the .packages file to check for packages we've completed in the
-  # past, and refresh them all.  This enables us to detect if we need to rerun
-  # pub for any of them.
-  if [ -e ".packages" -a -z "${HAVE_DONE_GLOBAL_REFRESH}" ] ; then
-    HAVE_DONE_GLOBAL_REFRESH=1
-    for n in $(grep -v '^#' ".packages" | cut -f 1 -d :) ; do
-      add_package_to_workspace "$n"
-    done
-  fi
-
-  if [ "${package_name}" = "kernel" ] ; then
-    # HACK ALERT: kernel depends on unpublished packages, so we can't use pub.
-    for n in args meta expect front_end test testing ; do
-      add_package_to_workspace "$n"
-    done
-  else
-    # HACK ALERT: some packages have dependencies only available via path. Add
-    # those here.
-    case "${package_name}" in
-      analyzer)
-        add_package_to_workspace "analyzer_utilities"
-        ;;
-    esac
-    if [ -n "${NO_UPDATE}" ] || repo_changed_this_run "${repo}" ; then
-      if [ -z "${ONE_PUB_ONLY}" ] ; then
-        for n in $(generate_package_names_with_yq "${package_name}") ; do
-          add_package_to_workspace "$n"
-        done
-      else
-        for n in $(generate_package_names_with_pub "${package_name}") ; do
-          add_package_to_workspace "$n"
-        done
-      fi
-    fi
-  fi
-  rm -f "${package_name}/.packages"
-  rm -f "${package_name}/pubspec.lock"
-  rm -f "${package_name}/.dart_tool/package_config.json"
-}
-
-
-#
-# Creates a flat workspace for the given package name.
-#
-# All repositories are checked out no more than once under _repos.  These
-# clones are "stock" without full history but should still be usable to make
-# changes on -- the main issue is that all of them have any checked in
-# .packages, pubspec.lock, or package_config.json files hidden.  This could
-# impact test running in the SDK if dev_dependencies are not fully specified in
-# pubspec.yaml -- modify this script to add the necessary entries if need be.
-#
-# Symlinks to package directories are placed in the root of the workspace for
-# convenience.
-#
-# One .packages file to rule them all is placed in the root of the workspace --
-# do not run pub get yourself on any of the packages.
-#
-# Set "NO_UPDATE" to "echo" to not try git pull on existing repos and to assume
-# we always have to re-pub-get.  This is useful in debugging the script and
-# iteratively adding repository configurations.
-#
-# Set "ONE_PUB_ONLY" to the package being migrated to restrict running pub to
-# one package only.  This has the impact of only pulling in dev dependencies
-# for the top level package.
-#
-# This script might be able to update your existing workspace, or it might
-# trash it completely.  Make backups.
-#
-function main {
-  if ! which yq ; then
-    echo "missing: yq.  apt-get install yq or brew install yq" >&2
-    return 2
-  fi
-
-  if [ -z "$1" -o -z "$2" ] ; then
-    echo usage: $0 source_package_name workspace_dir
-    return 2
-  fi
-
-  DEST_WORKSPACE_ROOT="$2"
-
-  mkdir -p ${DEST_WORKSPACE_ROOT}
-  cd ${DEST_WORKSPACE_ROOT}
-
-  add_package_to_workspace "$1"
-}
-
-
-main "$@"
diff --git a/pkg/nnbd_migration/tool/summary_stats.dart b/pkg/nnbd_migration/tool/summary_stats.dart
deleted file mode 100644
index 6e7bd5175ccb..000000000000
--- a/pkg/nnbd_migration/tool/summary_stats.dart
+++ /dev/null
@@ -1,53 +0,0 @@
-import 'dart:convert' show jsonDecode;
-import 'dart:io';
-
-void main(List args) {
-  var jsonPath = args[0];
-  var json =
-      jsonDecode(File(jsonPath).readAsStringSync()) as Map;
-  var changes = json['changes'] as Map;
-  var byPath = changes['byPath'] as Map?;
-  if (args.isEmpty) {
-    print('''
-Usage: summary_stats.dart  [category_name]
-
-Prints statistics of `dart migrate` suggestions summary, created with the
-`--summary` flag of `dart migrate`.
-
-If [category_name] is not given, this prints the total number of suggestions
-which the tool made, per category.
-
-If [category_name] is given, this prints the file names and suggestion counts of
-each file with one or more suggestions categorized as [category_name].
-''');
-  } else if (args.length == 1) {
-    _printTotals(byPath!);
-  } else {
-    var category = args[1];
-    _printCategory(byPath!, category);
-  }
-}
-
-/// Prints the file names and counts of files with suggestions of [category].
-void _printCategory(Map byPath, String category) {
-  byPath.forEach((String path, Object value) {
-    var counts = value as Map;
-    if (counts.containsKey(category)) {
-      print('$path: ${counts[category]}');
-    }
-  });
-}
-
-/// Prints the total number of suggestions for each category.
-void _printTotals(Map byPath) {
-  var summary = {};
-  for (var file in byPath.values.cast>()) {
-    file.forEach((category, count) {
-      summary[category as String] = (summary[category] ?? 0) + (count as int);
-    });
-  }
-  var categories = summary.keys.toList()..sort();
-  for (var category in categories) {
-    print('$category:  ${summary[category]}');
-  }
-}