#2004. Add deferred libraries tests according to the changed spec

Language/Libraries_and_Scripts/Imports/same_name_prefix_A01_t01.dart

@@ -0,0 +1,23 @@
+// Copyright (c) 2023, 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.
+
+/// @assertion It is a compile-time error if the prefix used in a deferred
+/// import is also used as the prefix of another import clause
+///
+/// @description Checks that it is a compile-time error if the prefix used in a
+/// deferred import is also used as the prefix of another deferred import clause
+/// @author sgrekhov22@gmail.com
+
+import 'static_type_lib.dart' deferred as p;
+//                            ^^^^^^^^
+// [analyzer] unspecified
+
+import 'syntax_lib.dart' deferred as p;
+//                       ^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+main() {
+  p.loadLibrary();
+}

Language/Libraries_and_Scripts/Imports/same_name_prefix_A01_t02.dart

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+// Copyright (c) 2023, 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.
+
+/// @assertion It is a compile-time error if the prefix used in a deferred
+/// import is also used as the prefix of another import clause
+///
+/// @description Checks that it is a compile-time error if the prefix used in a
+/// deferred import is also used as the prefix of another immediate import
+/// clause
+/// @author sgrekhov22@gmail.com
+
+import 'static_type_lib.dart' deferred as p;
+//                            ^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+import 'syntax_lib.dart' as p;
+
+main() {
+  p.loadLibrary();
+}

Language/Libraries_and_Scripts/Imports/same_name_prefix_A02_t01.dart

@@ -0,0 +1,20 @@
+// Copyright (c) 2023, 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.
+
+/// @assertion It is a compile-time error if the prefix used in a deferred
+/// import is also used as the prefix of another import clause
+///
+/// @description Checks that it is not an error if the prefix used in a
+/// non-deferred import is also used as the prefix of another immediate import
+/// clause
+/// @author sgrekhov22@gmail.com
+
+import '../../../Utils/expect.dart';
+import 'static_type_lib.dart' as p;
+import 'syntax_lib.dart' as p;
+
+main() {
+  Expect.equals(1, p.someFunc()); // from static_type_lib.dart
+  Expect.equals("hide", p.hide); // from syntax_lib.dart
+}

Language/Libraries_and_Scripts/Imports/same_name_prefix_A02_t02.dart

@@ -0,0 +1,23 @@
+// Copyright (c) 2023, 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.
+
+/// @assertion It is a compile-time error if the prefix used in a deferred
+/// import is also used as the prefix of another import clause
+///
+/// @description Checks that it is not an error if two deferred libraries with
+/// two different prefixes are imported
+/// @author sgrekhov22@gmail.com
+
+import '../../../Utils/expect.dart';
+import 'static_type_lib.dart' deferred as p1;
+import 'syntax_lib.dart' deferred as p2;
+
+main() async {
+  asyncStart();
+  await p1.loadLibrary();
+  await p2.loadLibrary();
+  Expect.equals(1, p1.someFunc()); // from static_type_lib.dart
+  Expect.equals("hide", p2.hide); // from syntax_lib.dart
+  asyncEnd();
+}

Language/Libraries_and_Scripts/Imports/semantics_A01_t01.dart

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+// Copyright (c) 2023, 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.
+
+/// @assertion Let Ii be an import directive that refers to a URI via the string
+/// si. The semantics of Ii is specified as follows:
+/// Case ⟨Semantics of deferred imports⟩. If Ii is a deferred import with prefix
+/// p, a binding of p to a deferred prefix run-time namespace NSdeferred is
+/// present in the library namespace of the current library L. Let NSimport,i be
+/// the namespace imported from the library specified by Ii.
+/// NSdeferred then has the following bindings:
+/// • The name loadLibrary is bound to a function with signature
+///   Future<void> loadLibrary(). This function returns a future f. When called,
+///   the function causes an immediate import I′ to be executed at some future
+///   time, where I′ is derived from Ii by eliding the word deferred and adding
+///   a hide loadLibrary combinator clause. The execution of the immediate
+///   import may fail for implementation specific reasons. For instance, I′
+///   imports a different library than the one that the specified URI referred
+///   to at compiletime; or an OS level file read error occurs; etc. We say that
+///   the invocation of loadLibrary succeeds if f completes with a value, and
+///   that the invocation fails if f completes with an error.
+///
+/// @description Checks that static type of `loadLibrary` is
+/// `Future<void> Function()`
+/// @author sgrekhov22@gmail.com
+
+import "static_type_lib.dart" deferred as p;
+import "../../../Utils/static_type_helper.dart";
+
+main() {
+  p.loadLibrary.expectStaticType<Exactly<Future<void> Function()>>();
+}

Language/Libraries_and_Scripts/Imports/semantics_A01_t02.dart

@@ -0,0 +1,49 @@
+// Copyright (c) 2011, 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.
+
+/// @assertion Let Ii be an import directive that refers to a URI via the string
+/// si. The semantics of Ii is specified as follows:
+/// Case ⟨Semantics of deferred imports⟩. If Ii is a deferred import with prefix
+/// p, a binding of p to a deferred prefix run-time namespace NSdeferred is
+/// present in the library namespace of the current library L. Let NSimport,i be
+/// the namespace imported from the library specified by Ii.
+/// NSdeferred then has the following bindings:
+/// • The name loadLibrary is bound to a function with signature
+///   Future<void> loadLibrary(). This function returns a future f. When called,
+///   the function causes an immediate import I′ to be executed at some future
+///   time, where I′ is derived from Ii by eliding the word deferred and adding
+///   a hide loadLibrary combinator clause. The execution of the immediate
+///   import may fail for implementation specific reasons. For instance, I′
+///   imports a different library than the one that the specified URI referred
+///   to at compiletime; or an OS level file read error occurs; etc. We say that
+///   the invocation of loadLibrary succeeds if f completes with a value, and
+///   that the invocation fails if f completes with an error.
+///
+/// @description Checks that call of `loadLibrary` causes an immediate import of
+/// the deferred library
+/// @author ngl@unipro.ru
+
+import "../../../Utils/expect.dart";
+import "static_type_lib.dart" deferred as p;
+
+void testLoaded() {
+  Expect.equals(1, p.someFunc());
+  Expect.equals(3, p.someVar);
+  Expect.equals(2, p.someGetter);
+  p.someSetter = 1;
+  p.Func;
+  Expect.isTrue(p.loadLibrary() is Future<void>);
+  Expect.runtimeIsType<Future<void>>(p.loadLibrary());
+}
+
+main()  {
+  asyncStart();
+  p.loadLibrary().then((v) {
+    testLoaded();
+    asyncEnd();
+  },
+  onError: (e) {
+    Expect.fail("Library should be loaded");
+  });
+}

Language/Libraries_and_Scripts/Imports/semantics_A02_t01.dart

@@ -0,0 +1,39 @@
+// Copyright (c) 2011, 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.
+
+/// @assertion Let Ii be an import directive that refers to a URI via the string
+/// si. The semantics of Ii is specified as follows:
+/// Case ⟨Semantics of deferred imports⟩. If Ii is a deferred import with prefix
+/// p, a binding of p to a deferred prefix run-time namespace NSdeferred is
+/// present in the library namespace of the current library L. Let NSimport,i be
+/// the namespace imported from the library specified by Ii.
+/// NSdeferred then has the following bindings:
+/// ...
+/// • For every top level function f named id in NSimport,i, a corresponding
+///   function named id with the same signature as f. Calling the function
+///   results in a dynamic error that occurs before any actual arguments are
+///   evaluated. Closurizing the function also results in a dynamic error.
+/// • For every top level getter g named id in NSimport,i, a corresponding
+///   getter named id with the same signature as g. Calling the getter results
+///   in a dynamic error.
+/// • For every top level setter s named id= in NSimport,i, a corresponding
+///   setter named id= with the same signature as s. Calling the setter results
+///   in a dynamic error that occurs before the actual argument is evaluated.
+///
+/// @description Checks that for every top-level declaration in the imported
+/// library a corresponding declaration with the same name created in the
+/// current library. Calling the imported name results in a runtime error.
+/// @Issue 33118
+/// @issue 42491
+/// @author ngl@unipro.ru
+
+import "../../../Utils/expect.dart";
+import "static_type_lib.dart" deferred as p;
+
+main() {
+  Expect.throws(() { p.someFunc(); }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { p.someGetter; }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { p.someSetter = 2; }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { p.Func; }, (e) => e is NoSuchMethodError);
+}