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Simplify pattern grammar, improve or-pattern diagnostics #81869

Merged
merged 1 commit into from
Feb 18, 2021
Merged

Simplify pattern grammar, improve or-pattern diagnostics #81869

merged 1 commit into from
Feb 18, 2021

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@mark-i-m mark-i-m commented Feb 8, 2021

This implements the change under FCP in #81415. It allows nested or-patterns to contain a leading |, simplifying the grammar for patterns.

Along the way, we also improve the diagnostics around a few specially-handled cases, such as using || instead of |, using or-patterns in fn params, including the leading | in the pattern span, etc.

r? @petrochenkov

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Feb 8, 2021
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mark-i-m commented Feb 8, 2021

(blocked on the FCP)

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@petrochenkov petrochenkov added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 9, 2021
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@mark-i-m mark-i-m mentioned this pull request Feb 13, 2021
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r=me with commits squashed.

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Simplify pattern grammar by allowing nested leading vert
aee1e59 
Along the way, we also implement a handful of diagnostics improvements
and fixes, particularly with respect to the special handling of `||` in
place of `|` and when there are leading verts in function params, which
don't allow top-level or-patterns anyway.
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@rustbot modify labels: -S-waiting-on-author +S-waiting-on-review

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Feb 15, 2021
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@bors r+

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bors commented Feb 15, 2021

📌 Commit aee1e59 has been approved by petrochenkov

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 15, 2021
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Feb 16, 2021
@Dylan-DPC
Rollup merge of rust-lang#81869 - mark-i-m:leading-vert, r=petrochenkov
359bd0e 
Simplify pattern grammar, improve or-pattern diagnostics

This implements the change under FCP in rust-lang#81415. It allows nested or-patterns to contain a leading `|`, simplifying the [grammar for patterns](https://github.com/rust-lang/reference/pull/957/files?short_path=cc629f1#diff-cc629f15712821139bc706c63b3845ab59a008e2a998e08ffad42e3aebcbcbe2).

Along the way, we also improve the diagnostics around a few specially-handled cases, such as using `||` instead of `|`, using or-patterns in fn params, including the leading `|` in the pattern span, etc.

r? `@petrochenkov`
@Dylan-DPC-zz Dylan-DPC-zz mentioned this pull request Feb 16, 2021
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Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Feb 16, 2021
@Dylan-DPC
Rollup merge of rust-lang#81869 - mark-i-m:leading-vert, r=petrochenkov
f9f1f23 
Simplify pattern grammar, improve or-pattern diagnostics

This implements the change under FCP in rust-lang#81415. It allows nested or-patterns to contain a leading `|`, simplifying the [grammar for patterns](https://github.com/rust-lang/reference/pull/957/files?short_path=cc629f1#diff-cc629f15712821139bc706c63b3845ab59a008e2a998e08ffad42e3aebcbcbe2).

Along the way, we also improve the diagnostics around a few specially-handled cases, such as using `||` instead of `|`, using or-patterns in fn params, including the leading `|` in the pattern span, etc.

r? ``@petrochenkov``
@Dylan-DPC-zz Dylan-DPC-zz mentioned this pull request Feb 16, 2021
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Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Feb 17, 2021
@Dylan-DPC
Rollup merge of rust-lang#81869 - mark-i-m:leading-vert, r=petrochenkov
6ea042c 
Simplify pattern grammar, improve or-pattern diagnostics

This implements the change under FCP in rust-lang#81415. It allows nested or-patterns to contain a leading `|`, simplifying the [grammar for patterns](https://github.com/rust-lang/reference/pull/957/files?short_path=cc629f1#diff-cc629f15712821139bc706c63b3845ab59a008e2a998e08ffad42e3aebcbcbe2).

Along the way, we also improve the diagnostics around a few specially-handled cases, such as using `||` instead of `|`, using or-patterns in fn params, including the leading `|` in the pattern span, etc.

r? ```@petrochenkov```
@Dylan-DPC-zz Dylan-DPC-zz mentioned this pull request Feb 17, 2021
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bors commented Feb 17, 2021

⌛ Testing commit aee1e59 with merge eed9db515e021252ae97a7ffa64238ad040ccbea...

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bors commented Feb 17, 2021

💥 Test timed out

@bors bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Feb 17, 2021
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Looks spurious?

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@bors retry

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 17, 2021
@Dylan-DPC-zz Dylan-DPC-zz mentioned this pull request Feb 17, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 18, 2021
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Auto merge of rust-lang#82241 - Dylan-DPC:rollup-munmzg5, r=Dylan-DPC
cbf666d 
Rollup of 8 pull requests

Successful merges:

 - rust-lang#77728 (Expose force_quotes on Windows.)
 - rust-lang#80572 (Add a `Result::into_ok_or_err` method to extract a `T` from `Result<T, T>`)
 - rust-lang#81860 (Fix SourceMap::start_point)
 - rust-lang#81869 (Simplify pattern grammar, improve or-pattern diagnostics)
 - rust-lang#81898 (Fix debug information for function arguments of type &str or slice.)
 - rust-lang#81972 (Placeholder lifetime error cleanup)
 - rust-lang#82007 (Implement reborrow for closure captures)
 - rust-lang#82021 (Spell out nested Self type in lint message)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 91e5384 into rust-lang:master Feb 18, 2021
@rustbot rustbot added this to the 1.52.0 milestone Feb 18, 2021
@mark-i-m mark-i-m mentioned this pull request Mar 4, 2021
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m-ou-se added a commit to m-ou-se/rust that referenced this pull request Mar 6, 2021
@m-ou-se
Rollup merge of rust-lang#82048 - mark-i-m:or-pat-type-ascription, r=…
7f2c008 
…petrochenkov

or-patterns: disallow in `let` bindings

~~Blocked on rust-lang#81869

Disallows top-level or-patterns before type ascription. We want to reserve this syntactic space for possible future generalized type ascription.

r? `@petrochenkov`
m-ou-se added a commit to m-ou-se/rust that referenced this pull request Mar 9, 2021
@m-ou-se
Rollup merge of rust-lang#82048 - mark-i-m:or-pat-type-ascription, r=…
8684eb9 
…petrochenkov

or-patterns: disallow in `let` bindings

~~Blocked on rust-lang#81869

Disallows top-level or-patterns before type ascription. We want to reserve this syntactic space for possible future generalized type ascription.

r? `@petrochenkov`
m-ou-se added a commit to m-ou-se/rust that referenced this pull request Mar 9, 2021
@m-ou-se
Rollup merge of rust-lang#82048 - mark-i-m:or-pat-type-ascription, r=…
0d97f9b 
…petrochenkov

or-patterns: disallow in `let` bindings

~~Blocked on rust-lang#81869

Disallows top-level or-patterns before type ascription. We want to reserve this syntactic space for possible future generalized type ascription.

r? ``@petrochenkov``
flip1995 pushed a commit to flip1995/rust-clippy that referenced this pull request Mar 11, 2021
@m-ou-se
Rollup merge of #82048 - mark-i-m:or-pat-type-ascription, r=petrochenkov
824662d 
or-patterns: disallow in `let` bindings

~~Blocked on rust-lang/rust#81869

Disallows top-level or-patterns before type ascription. We want to reserve this syntactic space for possible future generalized type ascription.

r? ``@petrochenkov``
@dtolnay dtolnay mentioned this pull request Mar 26, 2021
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@iDawer iDawer mentioned this pull request Jul 28, 2022
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@afetisov afetisov mentioned this pull request Aug 2, 2022
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yoav-lavi pushed a commit to grafbase/grafbase that referenced this pull request Sep 5, 2023
@mettke
fix(deps): update rust crate syn to v2 (#2512)
f87459b 
[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [syn](https://github.com/dtolnay/syn) | dependencies | major | `1`
-> `2` |

---

### Release Notes

<details>
<summary>dtolnay/syn (syn)</summary>

### [`v2.0.27`](https://github.com/dtolnay/syn/releases/tag/2.0.27)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.26...2.0.27)

- Documentation improvements (thanks
[@&#8203;GuillaumeGomez](https://github.com/GuillaumeGomez))

### [`v2.0.26`](https://github.com/dtolnay/syn/releases/tag/2.0.26)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.25...2.0.26)

- Implement `Spanned` for `QSelf`
([#&#8203;1465](https://github.com/dtolnay/syn/issues/1465))

### [`v2.0.25`](https://github.com/dtolnay/syn/releases/tag/2.0.25)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.24...2.0.25)

- Support single identifier as unbraced const generic argument
([#&#8203;1483](https://github.com/dtolnay/syn/issues/1483))
- Produce error message when LitStr::parse is used on a suffixed string
literal ([#&#8203;1484](https://github.com/dtolnay/syn/issues/1484))

### [`v2.0.24`](https://github.com/dtolnay/syn/releases/tag/2.0.24)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.23...2.0.24)

- Fix duplication of braces around const generic argument in non-full
mode ([#&#8203;1482](https://github.com/dtolnay/syn/issues/1482))

### [`v2.0.23`](https://github.com/dtolnay/syn/releases/tag/2.0.23)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.22...2.0.23)

- Preserve attributes on verbatim Item in statement position
([#&#8203;1476](https://github.com/dtolnay/syn/issues/1476))
- Support generic_const_exprs where-clauses such as `where [(); {
T::COUNT }]:` in non-"full" mode
([#&#8203;1478](https://github.com/dtolnay/syn/issues/1478))

### [`v2.0.22`](https://github.com/dtolnay/syn/releases/tag/2.0.22)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.21...2.0.22)

- Parse `c"…"` c-string literals (tracking issue:
[https://github.com/rust-lang/rust/issues/105723](https://github.com/rust-lang/rust/issues/105723))

### [`v2.0.21`](https://github.com/dtolnay/syn/releases/tag/2.0.21)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.20...2.0.21)

- Fix value computed by `LitByteStr::value` in the case of a cooked byte
string literal containing form feed or vertical tab characters following
an escaped newline
([#&#8203;1474](https://github.com/dtolnay/syn/issues/1474))

### [`v2.0.20`](https://github.com/dtolnay/syn/releases/tag/2.0.20)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.19...2.0.20)

-   Documentation improvements

### [`v2.0.19`](https://github.com/dtolnay/syn/releases/tag/2.0.19)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.18...2.0.19)

- Improve rendering of compile errors within 2015-edition code calling a
2018+ edition proc macro
([#&#8203;1467](https://github.com/dtolnay/syn/issues/1467), thanks
[@&#8203;danielhenrymantilla](https://github.com/danielhenrymantilla))

### [`v2.0.18`](https://github.com/dtolnay/syn/releases/tag/2.0.18)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.17...2.0.18)

- Permit empty attr in syn::meta::parser
([#&#8203;1460](https://github.com/dtolnay/syn/issues/1460))

### [`v2.0.17`](https://github.com/dtolnay/syn/releases/tag/2.0.17)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.16...2.0.17)

- Enable proc_macro support on wasm targets
([#&#8203;1459](https://github.com/dtolnay/syn/issues/1459))

### [`v2.0.16`](https://github.com/dtolnay/syn/releases/tag/2.0.16)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.15...2.0.16)

- Parse `builtin #` syntax as Expr::Verbatim
([https://github.com/rust-lang/rust/issues/110680](https://github.com/rust-lang/rust/issues/110680),
[#&#8203;1454](https://github.com/dtolnay/syn/issues/1454))

### [`v2.0.15`](https://github.com/dtolnay/syn/releases/tag/2.0.15)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.14...2.0.15)

- Ensure `Type::Tuple` of length 1 prints as a tuple even if trailing
comma is not provided in the Punctuated
([#&#8203;1444](https://github.com/dtolnay/syn/issues/1444), thanks
[@&#8203;Fancyflame](https://github.com/Fancyflame))

### [`v2.0.14`](https://github.com/dtolnay/syn/releases/tag/2.0.14)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.13...2.0.14)

- Add Punctuated::pop_punct()
([#&#8203;1442](https://github.com/dtolnay/syn/issues/1442), thanks
[@&#8203;programmerjake](https://github.com/programmerjake))

### [`v2.0.13`](https://github.com/dtolnay/syn/releases/tag/2.0.13)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.12...2.0.13)

- Improve spans of Expr::Field parsed from a float Literal
([#&#8203;1433](https://github.com/dtolnay/syn/issues/1433),
[#&#8203;1436](https://github.com/dtolnay/syn/issues/1436))

### [`v2.0.12`](https://github.com/dtolnay/syn/releases/tag/2.0.12)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.11...2.0.12)

- Refer to `compile_error!` by absolute path in token stream produced by
syn::Error::to_compile_error
([#&#8203;1431](https://github.com/dtolnay/syn/issues/1431), thanks
[@&#8203;smoelius](https://github.com/smoelius))

### [`v2.0.11`](https://github.com/dtolnay/syn/releases/tag/2.0.11)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.10...2.0.11)

- Improve error message on empty parens inside parse_nested_meta
([#&#8203;1428](https://github.com/dtolnay/syn/issues/1428))

### [`v2.0.10`](https://github.com/dtolnay/syn/releases/tag/2.0.10)

[Compare
Source](https://github.com/dtolnay/syn/compare/2.0.9...2.0.10)

- Fix visibility being parsed incorrectly on macro invocations inside of
a trait

### [`v2.0.9`](https://github.com/dtolnay/syn/releases/tag/2.0.9)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.8...2.0.9)

- Disallow `type` items in an extern block, trait, or module from being
marked `default`

### [`v2.0.8`](https://github.com/dtolnay/syn/releases/tag/2.0.8)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.7...2.0.8)

- Treat `try` keyword as 2015-edition identifier in definition of try
macro ([#&#8203;1422](https://github.com/dtolnay/syn/issues/1422))

### [`v2.0.7`](https://github.com/dtolnay/syn/releases/tag/2.0.7)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.6...2.0.7)

-   Fix parsing of `mut self` inside of Type::BareFn

### [`v2.0.6`](https://github.com/dtolnay/syn/releases/tag/2.0.6)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.5...2.0.6)

- Improve error message on missing ';' between statements
([#&#8203;1419](https://github.com/dtolnay/syn/issues/1419))
- Keep non-brace macro invocations in trailing expr position as
Expr::Macro
([#&#8203;1420](https://github.com/dtolnay/syn/issues/1420))

### [`v2.0.5`](https://github.com/dtolnay/syn/releases/tag/2.0.5)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.4...2.0.5)

- Expose `ExprMacro` data structure even when `features="full"` is not
used ([#&#8203;1417](https://github.com/dtolnay/syn/issues/1417))

### [`v2.0.4`](https://github.com/dtolnay/syn/releases/tag/2.0.4)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.3...2.0.4)

- Improve error reporting when parsing identifiers and paths
([#&#8203;1415](https://github.com/dtolnay/syn/issues/1415),
[#&#8203;1416](https://github.com/dtolnay/syn/issues/1416))

### [`v2.0.3`](https://github.com/dtolnay/syn/releases/tag/2.0.3)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.2...2.0.3)

- Expose `ExprGroup` data structure even when `features="full"` is not
used ([#&#8203;1412](https://github.com/dtolnay/syn/issues/1412))

### [`v2.0.2`](https://github.com/dtolnay/syn/releases/tag/2.0.2)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.1...2.0.2)

-   Documentation improvements

### [`v2.0.1`](https://github.com/dtolnay/syn/releases/tag/2.0.1)

[Compare Source](https://github.com/dtolnay/syn/compare/2.0.0...2.0.1)

- Add methods on syn::Meta for reporting error on an incorrect kind of
attribute ([#&#8203;1409](https://github.com/dtolnay/syn/issues/1409))

### [`v2.0.0`](https://github.com/dtolnay/syn/releases/tag/2.0.0)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.109...2.0.0)

This release contains a batch of syntax tree improvements to incorporate
ongoing Rust language development from the past 3.5 years since syn 1.

It never seems like an ideal time to finalize a syntax tree design,
considering the frankly alarming number of syntax-disrupting language
features currently in flight: keyword generics, restrictions,
capabilities and contexts, conditional constness, new varieties of
literals, dyn revamp such as explicitly dyn-safe traits and dyn-star,
expression syntax in various phases of being added or being torn out
(const blocks, try blocks, raw references), auto traits and negative
impls, generalizations to higher rank trait bounds, async closures and
static async trait methods, postfix keywords, pattern types, return type
notation, unsafe attributes, …

The plan continues to be the same as laid out originally in the 1.0.0
release announcement:

> Be aware that the underlying Rust language will continue to evolve.
Syn is able to accommodate most kinds of Rust grammar changes via the
nonexhaustive enums and `Verbatim` variants in the syntax tree, but we
will plan to put out new major versions on a 12 to 24 month cadence to
incorporate ongoing language changes as needed.

If anything, the takeaway from the 3.5 year longevity of syn 1 is that
this period was tamer from a language development perspective than
anticipated, but that is unlikely to last and I think around 24 months
is still the correct cadence to expect between releases going forward.

<br>

<p align="center"><a href="https://docs.rs/syn/2/syn/">[API
documentation for 2.0]</a></p>

### Breaking changes

-   Minimum required Rust version is raised from rustc 1.31 to 1.56.

##### Expressions

- Support for `box expr` syntax has been deleted, as it has been deleted
recently from rustc.

- Support for type ascription syntax `expr: Type` in expression position
has been deleted.

- Support for unstable `&raw const expr` raw-pointer reference syntax
has been deleted.

- The representation of generic arguments has been unified between
method calls and non-method paths into a single `GenericArgument` type,
which supersedes the previous `GenericMethodArgument` and
`MethodTurbofish`.

- Generic arguments now distinguish between associated types
(`AssocType`) and associated constant values (`AssocConst`). Previously
these would be parsed ambiguously as `Binding`.

- The binary assignment operators in `BinOp` have been renamed to align
with the naming used by the standard library's `core::ops` module's
traits. For example `BinOp::AddEq` is now called `BinOp::AddAssign`.

- `Expr::Struct` struct construction expressions now support structs
which are a variant of an enum associated type of a trait, as in `<Type
as Trait>::Assoc::Variant { ... }`, which has recently been added to
Rust.

- `Expr::Range` now follows the `start` and `end` naming used by the
standard library's `RangeBounds` trait, rather than `from`/`to` or
`lo`/`hi`.

- `Expr::AssignOp` has been merged into `Expr::Binary`, which now
represents both non-assignment and assignment binary operators.

- Stricter parsing of ranges. None of the following are valid
expressions, but were previously accepted by syn: `..=`, `lo..=`, `...`,
`...hi`, `lo...`, `lo...hi`.

- `Expr::Closure` now includes a representation for `for<...>`
lifetimes.

##### Statements

- Variants `Stmt::Expr` (tail-position expression without trailing
semicolon) and `Stmt::Semi` (non-tail expression with trailing
semicolon) have been combined into `Stmt::Expr` with the optional
semicolon represented by `Option<Token![;]>`.

- The syntax tree for `Stmt::Local` has been extended to handle
`let`/`else` syntax.

- Macros in statement position are now uniformly parsed as
`Stmt::Macro`. Previously these would be disambiguated to `Stmt::Item`,
although it was ambiguous whether a macro in statement position would
expand to an item (like `thread_local! { ... }`) vs an expression (like
`println! { ... }`).

##### Patterns

- Pattern parsing for all the different syntactic positions in which
patterns are allowed has been split into `Pat::parse_single` (for
function- and closure-argument position, where top-level `|` is not
allowed), `Pat::parse_multi` (where `|` is allowed) and
`Pat::parse_multi_with_leading_vert` (for the pattern of match arms,
which allow an optional leading `|`). Previously only a single `parse`
behavior was supported and behaved like the new `parse_single`.

- The `Pat` syntax tree now shares more common data structures with the
`Expr` syntax tree where possible, such as for literals, paths, macros,
and ranges in pattern position.

- Parsing of struct field patterns does a better job rejecting bogus
syntax such as `Struct { 0 asdf }` and `Struct { ref mut 0: asdf }`,
which were previously incorrectly accepted.

- `Pat::Range` now supports one-sided ranges by representing the start
and end bound of the range by `Option<Expr>`.

- `Pat::Struct` keeps track of attributes on the optional `..` "rest"
part of the pattern, as in `let Struct { x, #[cfg(any())] .. } = _;`.

- Parsing unary negation now enforces that only literal patterns can be
unarily negated. For example `-self::CONST` and `-const { 0i32 }` are
not valid syntax in pattern position.

- `Pat::TupleStruct` no longer wraps a value of type `PatTuple` but
represents that information in its fields directly.

- A single parenthesized pattern without trailing comma inside the
parentheses is no longer considered a `Pat::Tuple`, it will be parsed as
`Pat::Paren`.

- One-sided range patterns are no longer allowed inside of slice
patterns. `[lo..]` and `[..=hi]` are not considered valid pattern syntax
by Rust.

##### Items

- Typed `self` in a method signature, such as `self: Pin<&mut Self>`,
will now be parsed as `FnArg::Receiver`. This means `self`, whether with
or without an explicit type, is always treated as a `Receiver`.
Previously only the `&self` and `&mut self` shorthand receivers were
parsed as `Receiver`.

- `TraitItem::Method` and `ImplItem::Method` have been renamed to
`TraitItem::Fn` and `ImplItem::Fn`, as they do not necessarily represent
methods if the function signature contains no `self`.

- `Item::Macro2` has been deleted as "macros 2.0" syntax is no longer
considered on track for stabilization.

- Various item kinds now hold `Generics` which didn't used to have them.

- The variadic argument of an extern function signature can now be given
an optional parameter name.

-   `WherePredicate::Eq` is no longer supported.

- `Visibility::Crate` is no longer supported. This syntax has been
removed from rustc.

- Public visibility is now represented by a single `Token![pub]` token
rather than the old `VisPublic` struct.

- `LifetimeDef` is now called `LifetimeParam`. This name makes more
sense in the context of the `GenericParam` enum (which also includes
`TypeParam` and `ConstParam`), and is the name that the Rust Reference
uses.

- Modules and extern blocks (`Item::Mod` and `Item::ForeignMod`) can now
be marked `unsafe`.

##### Attributes

- The syntax tree for `Attribute` has been redesigned. The new API
better accommodates attributes which mix structured and unstructured
content at different levels of nesting.

-   `AttributeArgs` has been removed. Use `Punctuated<Meta, Token![,]>`.

- For parsing attribute contents, `parse_meta()` is superseded by a new
parsing library called `syn::meta`, and the `parse_nested_meta` method
on `Attribute`.

##### Tokens

- In string literals, the handling of non-ASCII whitespace after
trailing `\` now matches what is implemented by rustc. Space, horizontal
tab, line feed, and carriage return are the only 4 whitespace characters
which are supposed to be stripped from the beginning of the next line.

- The delimiter tokens `syn::token::Paren`, `Bracket`, and `Brace` now
store 2 spans (the open and close punctuation separately) rather than
just 1. Use `.join()` to obtain a single `Span` spanning the whole
group.

- Keyword construction now requires a single span; an array of 1 span is
no longer accepted. Use `Token![trait](span)` instead of
`Token![trait]([span])`.

- Some token types have been renamed to conform with terminology used by
the [Rust
Reference](https://doc.rust-lang.org/1.68.0/reference/tokens.html#punctuation).
These are `Add`->`Plus`, `Bang`->`Not`, `Colon2`->`PathSep`,
`Div`->`Slash`, `Dot2`->`DotDot`, `Dot3`->`DotDotDot`, `Rem`->`Percent`,
and `Sub`->`Minus`.

##### More

- Several enums have been made `#[non_exhaustive]` in anticipation of
upcoming language changes. This includes `WherePredicate`, `Lit`, and
`GenericArgument`.

- The `impl Extend<Pair<T, P>> for Punctuated<T, P>` now requires `P:
Default` and will push a default punctuation between the pre-existing
elements and the new ones, if there is not already a trailing
punctuation. Previously it would panic in this situation.

- `ParseStream::parse_terminated` now takes a peek-style punctuation
argument instead of turbofish. Replace `input.parse_terminated::<_,
Token![,]>(Thing::parse)` with `input.parse_terminated(Thing::parse,
Token![,])`.

###
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### [`v1.0.108`](https://github.com/dtolnay/syn/releases/tag/1.0.108)

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- Fix handling of unusual whitespace after escaped newlines in
`LitStr::value`
([#&#8203;1381](https://github.com/dtolnay/syn/issues/1381), thanks
[@&#8203;ModProg](https://github.com/ModProg))

### [`v1.0.107`](https://github.com/dtolnay/syn/releases/tag/1.0.107)

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-   Opt out of `-Zrustdoc-scrape-examples` on docs.rs for now

### [`v1.0.106`](https://github.com/dtolnay/syn/releases/tag/1.0.106)

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-   Documentation improvements

### [`v1.0.105`](https://github.com/dtolnay/syn/releases/tag/1.0.105)

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- Improve parse errors related to `dyn` and `impl` type syntax
([#&#8203;1245](https://github.com/dtolnay/syn/issues/1245))

### [`v1.0.104`](https://github.com/dtolnay/syn/releases/tag/1.0.104)

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-   Add `PathArguments::is_none()`

### [`v1.0.103`](https://github.com/dtolnay/syn/releases/tag/1.0.103)

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- Implement `PartialOrd` for `Cursor`
([#&#8203;1236](https://github.com/dtolnay/syn/issues/1236),
[#&#8203;1237](https://github.com/dtolnay/syn/issues/1237), thanks
[@&#8203;CAD97](https://github.com/CAD97))

### [`v1.0.102`](https://github.com/dtolnay/syn/releases/tag/1.0.102)

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- More efficient internal representation for `TokenBuffer`
([#&#8203;1223](https://github.com/dtolnay/syn/issues/1223), thanks
[@&#8203;CAD97](https://github.com/CAD97))
- Fix parsing of a left shift after macro metavariable in type position
([#&#8203;1229](https://github.com/dtolnay/syn/issues/1229))

### [`v1.0.101`](https://github.com/dtolnay/syn/releases/tag/1.0.101)

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- Eliminate a bunch of redundant work done by LitStr::parse
([#&#8203;1221](https://github.com/dtolnay/syn/issues/1221))

### [`v1.0.100`](https://github.com/dtolnay/syn/releases/tag/1.0.100)

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- Parse closures with explicit empty lifetime parameter list `for<> ||
-> T {…}` ([#&#8203;1212](https://github.com/dtolnay/syn/issues/1212),
[https://github.com/rust-lang/rust/issues/97362](https://github.com/rust-lang/rust/issues/97362))
- Parse `dyn*` provisional syntax
([#&#8203;1213](https://github.com/dtolnay/syn/issues/1213),
[https://github.com/rust-lang/rust/issues/91611](https://github.com/rust-lang/rust/issues/91611))
- Parse attributes on the "rest" pattern of a struct in pattern
position, `Struct { #[attr] .. }`
([#&#8203;1214](https://github.com/dtolnay/syn/issues/1214))
- Parse `static async` and `static async move` closures
([#&#8203;1215](https://github.com/dtolnay/syn/issues/1215),
[https://github.com/rust-lang/rust/issues/62290](https://github.com/rust-lang/rust/issues/62290))

### [`v1.0.99`](https://github.com/dtolnay/syn/releases/tag/1.0.99)

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-   Add categories and keywords to crates.io metadata

### [`v1.0.98`](https://github.com/dtolnay/syn/releases/tag/1.0.98)

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-   Format example code with rustfmt

### [`v1.0.97`](https://github.com/dtolnay/syn/releases/tag/1.0.97)

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-   Update examples

### [`v1.0.96`](https://github.com/dtolnay/syn/releases/tag/1.0.96)

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- Add a `punct_mut()` method on `syn::punctuated::Pair` to return
`Option<&mut P>`
([#&#8203;1183](https://github.com/dtolnay/syn/issues/1183))

### [`v1.0.95`](https://github.com/dtolnay/syn/releases/tag/1.0.95)

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- Replace unicode-xid with unicode-ident crate:
https://github.com/dtolnay/unicode-ident

### [`v1.0.94`](https://github.com/dtolnay/syn/releases/tag/1.0.94)

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-   Resolve some unused_macro_rules warnings

### [`v1.0.93`](https://github.com/dtolnay/syn/releases/tag/1.0.93)

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- Fix compile error when `Some` means something unusual in the
expression namespace of the scope where `custom_keyword` is invoked
([#&#8203;1171](https://github.com/dtolnay/syn/issues/1171), thanks
[@&#8203;zakarumych](https://github.com/zakarumych))

### [`v1.0.92`](https://github.com/dtolnay/syn/releases/tag/1.0.92)

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- Make compatible with Miri's tag-raw-pointers mode
([#&#8203;1166](https://github.com/dtolnay/syn/issues/1166), thanks
[@&#8203;saethlin](https://github.com/saethlin))

### [`v1.0.91`](https://github.com/dtolnay/syn/releases/tag/1.0.91)

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-   impl ToTokens for RangeLimits
-   impl Parse for ExprAwait
-   impl Parse for GenericMethodArgument
-   impl Parse for MethodTurbofish

### [`v1.0.90`](https://github.com/dtolnay/syn/releases/tag/1.0.90)

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- Update recommended exhaustive matching idiom to use
`non_exhaustive_omitted_patterns` lint:

    ```rust
    match expr {
        Expr::Array(e) => {…}
        Expr::Assign(e) => {…}
        ...
        Expr::Yield(e) => {…}

        #[cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
        _ => {/* some sane fallback */}
    }
    ```

### [`v1.0.89`](https://github.com/dtolnay/syn/releases/tag/1.0.89)

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- Remove support for inner attributes on non-block expressions
([#&#8203;1146](https://github.com/dtolnay/syn/issues/1146),
[https://github.com/rust-lang/rust/pull/83312](https://github.com/rust-lang/rust/pull/83312))
- Fix panic on comma after `mut self` in a bare fn type
([#&#8203;1148](https://github.com/dtolnay/syn/issues/1148))

### [`v1.0.88`](https://github.com/dtolnay/syn/releases/tag/1.0.88)

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- Parse `..` pattern in pattern of `let`
([#&#8203;1136](https://github.com/dtolnay/syn/issues/1136))
- Parse `for<…>` lifetime introducer on closures
([#&#8203;1135](https://github.com/dtolnay/syn/issues/1135))
- Reject postfix operators after cast
([#&#8203;1117](https://github.com/dtolnay/syn/issues/1117))
- Implement extra-traits for `Nothing`
([#&#8203;1144](https://github.com/dtolnay/syn/issues/1144))

### [`v1.0.87`](https://github.com/dtolnay/syn/releases/tag/1.0.87)

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- Parse trait bounds containing associated constant constraint
([#&#8203;1138](https://github.com/dtolnay/syn/issues/1138))
- Change syntax of where-clauses on generic associated types
([#&#8203;1071](https://github.com/dtolnay/syn/issues/1071),
[https://github.com/rust-lang/rust/issues/89122](https://github.com/rust-lang/rust/issues/89122))

### [`v1.0.86`](https://github.com/dtolnay/syn/releases/tag/1.0.86)

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-   Add support for parsing if- and while-let-chains (RFC 2497)

### [`v1.0.85`](https://github.com/dtolnay/syn/releases/tag/1.0.85)

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- Add `token()` method to each variant of syn::Lit to expose the
underlying token representation with original formatting

### [`v1.0.84`](https://github.com/dtolnay/syn/releases/tag/1.0.84)

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- Add
[`parse_quote_spanned!`](https://docs.rs/syn/1.0.84/syn/macro.parse_quote_spanned.html)
macro which is a combination `parse_quote!` + `quote_spanned!`

### [`v1.0.83`](https://github.com/dtolnay/syn/releases/tag/1.0.83)

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- Fix panic parsing trait impl with qself in trait type: `impl
<Thing<>>::Trait for Type {}`
([#&#8203;1109](https://github.com/dtolnay/syn/issues/1109))
- Preserve attributes on let-else stmt: `#[attr] let pat = val else {
return }` ([#&#8203;1110](https://github.com/dtolnay/syn/issues/1110))

### [`v1.0.82`](https://github.com/dtolnay/syn/releases/tag/1.0.82)

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- Support parenthesized generic argument syntax with `::` disambiguator:
`Fn::() -> !`
([#&#8203;1096](https://github.com/dtolnay/syn/issues/1096))

### [`v1.0.81`](https://github.com/dtolnay/syn/releases/tag/1.0.81)

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- Support arbitrary precision negative literal tokens on rustc 1.56+
([#&#8203;1087](https://github.com/dtolnay/syn/issues/1087),
[#&#8203;1088](https://github.com/dtolnay/syn/issues/1088))

### [`v1.0.80`](https://github.com/dtolnay/syn/releases/tag/1.0.80)

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- Parse unstable `~const` syntax in where-clauses
([#&#8203;1083](https://github.com/dtolnay/syn/issues/1083), tracking
issue
[https://github.com/rust-lang/rust/issues/67792](https://github.com/rust-lang/rust/issues/67792))

### [`v1.0.79`](https://github.com/dtolnay/syn/releases/tag/1.0.79)

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- Support trailing `+` in `dyn Trait` syntax, including bare (non-`dyn`)
pre-2018 trait object syntax
([#&#8203;1075](https://github.com/dtolnay/syn/issues/1075),
[#&#8203;1077](https://github.com/dtolnay/syn/issues/1077),
[#&#8203;1078](https://github.com/dtolnay/syn/issues/1078),
[#&#8203;1079](https://github.com/dtolnay/syn/issues/1079),
[#&#8203;1080](https://github.com/dtolnay/syn/issues/1080),
[#&#8203;1081](https://github.com/dtolnay/syn/issues/1081))

### [`v1.0.78`](https://github.com/dtolnay/syn/releases/tag/1.0.78)

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- Parse trailing `+` in the bounds of `impl Trait` type
([#&#8203;1073](https://github.com/dtolnay/syn/issues/1073))

### [`v1.0.77`](https://github.com/dtolnay/syn/releases/tag/1.0.77)

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- Match Rust 1.57+'s parsing of dot and question mark after a curly
braced macro invocation
([#&#8203;1068](https://github.com/dtolnay/syn/issues/1068))

### [`v1.0.76`](https://github.com/dtolnay/syn/releases/tag/1.0.76)

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- Parse unstable `let`–`else` syntax
([#&#8203;1050](https://github.com/dtolnay/syn/issues/1050),
[#&#8203;1057](https://github.com/dtolnay/syn/issues/1057))
- Parse qualified braced variant expressions and patterns: `<E>::V {..}`
([#&#8203;1058](https://github.com/dtolnay/syn/issues/1058),
[#&#8203;1059](https://github.com/dtolnay/syn/issues/1059))
- Fix precedence of outer attributes in front of an assignment
expression in statement position
([#&#8203;1060](https://github.com/dtolnay/syn/issues/1060))

### [`v1.0.75`](https://github.com/dtolnay/syn/releases/tag/1.0.75)

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-   Improve spans on a method without body inside an impl block
- Documentation improvements
([#&#8203;922](https://github.com/dtolnay/syn/issues/922), thanks
[@&#8203;Tamschi](https://github.com/Tamschi))

### [`v1.0.74`](https://github.com/dtolnay/syn/releases/tag/1.0.74)

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- Reject `for<'a> dyn Trait<'a>` syntax; the correct representation is
`dyn for<'a> Trait<'a>`
([#&#8203;1042](https://github.com/dtolnay/syn/issues/1042))

### [`v1.0.73`](https://github.com/dtolnay/syn/releases/tag/1.0.73)

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- Add From\<Ident>, From\<Index>, From\<usize> for Member
([#&#8203;1038](https://github.com/dtolnay/syn/issues/1038), thanks
[@&#8203;m-ou-se](https://github.com/m-ou-se))

### [`v1.0.72`](https://github.com/dtolnay/syn/releases/tag/1.0.72)

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- Parse const generics which use value of a previous const generic
parameter as a default value
([#&#8203;1027](https://github.com/dtolnay/syn/issues/1027))

### [`v1.0.71`](https://github.com/dtolnay/syn/releases/tag/1.0.71)

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- Fix panic deserializing an ItemImpl with a non-path in trait position
([#&#8203;1023](https://github.com/dtolnay/syn/issues/1023))
- Parse visibility on impl blocks
([#&#8203;1024](https://github.com/dtolnay/syn/issues/1024))
- Fix parsing a type parameter default on the first generic parameter of
an impl block
([#&#8203;1025](https://github.com/dtolnay/syn/issues/1025), thanks
[@&#8203;taiki-e](https://github.com/taiki-e))

### [`v1.0.70`](https://github.com/dtolnay/syn/releases/tag/1.0.70)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.69...1.0.70)

- Fix precedence of closure body vs ExprRange rhs: `|| .. .method()`
([#&#8203;1019](https://github.com/dtolnay/syn/issues/1019))
- Parse inner attributes inside of structs and enums
([#&#8203;1022](https://github.com/dtolnay/syn/issues/1022))

### [`v1.0.69`](https://github.com/dtolnay/syn/releases/tag/1.0.69)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.68...1.0.69)

- Improve Parse impls of ExprBox, ExprUnary, ExprLet, ExprClosure,
ExprReference, ExprBreak, ExprContinue, ExprReturn, ExprYield to respect
precedence for parsing a subexpression beginning with the respective
keyword/punctuation
([#&#8203;1007](https://github.com/dtolnay/syn/issues/1007),
[#&#8203;1008](https://github.com/dtolnay/syn/issues/1008),
[#&#8203;1009](https://github.com/dtolnay/syn/issues/1009),
[#&#8203;1010](https://github.com/dtolnay/syn/issues/1010),
[#&#8203;1011](https://github.com/dtolnay/syn/issues/1011),
[#&#8203;1012](https://github.com/dtolnay/syn/issues/1012),
[#&#8203;1013](https://github.com/dtolnay/syn/issues/1013),
[#&#8203;1014](https://github.com/dtolnay/syn/issues/1014),
[#&#8203;1015](https://github.com/dtolnay/syn/issues/1015))

### [`v1.0.68`](https://github.com/dtolnay/syn/releases/tag/1.0.68)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.67...1.0.68)

- Preserve span of `LexError` on conversion to `syn::Error`
([#&#8203;1006](https://github.com/dtolnay/syn/issues/1006))

### [`v1.0.67`](https://github.com/dtolnay/syn/releases/tag/1.0.67)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.66...1.0.67)

- Accept outer attributes in the Parse impl of ExprBlock
([#&#8203;1004](https://github.com/dtolnay/syn/issues/1004))

### [`v1.0.66`](https://github.com/dtolnay/syn/releases/tag/1.0.66)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.65...1.0.66)

- Parse equality constraints on generic associated types
([#&#8203;979](https://github.com/dtolnay/syn/issues/979))
- Parse default value exprs in const generic declarations
([#&#8203;980](https://github.com/dtolnay/syn/issues/980))
- Fix infinite loop parsing malformed type ascription expression in
non-`full` mode
([#&#8203;978](https://github.com/dtolnay/syn/issues/978))
- Improve Parse impls of ExprArray, ExprAsync, ExprBlock, ExprMacro,
ExprParen, ExprRepeat, ExprStruct, ExprTryBlock, ExprUnsafe to succeed
parsing even in the presence of trailing binary operators
([#&#8203;991](https://github.com/dtolnay/syn/issues/991),
[#&#8203;992](https://github.com/dtolnay/syn/issues/992),
[#&#8203;993](https://github.com/dtolnay/syn/issues/993),
[#&#8203;994](https://github.com/dtolnay/syn/issues/994),
[#&#8203;995](https://github.com/dtolnay/syn/issues/995),
[#&#8203;996](https://github.com/dtolnay/syn/issues/996),
[#&#8203;997](https://github.com/dtolnay/syn/issues/997),
[#&#8203;998](https://github.com/dtolnay/syn/issues/998),
[#&#8203;999](https://github.com/dtolnay/syn/issues/999))

### [`v1.0.65`](https://github.com/dtolnay/syn/releases/tag/1.0.65)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.64...1.0.65)

- Parse visibility on macro_rules
([#&#8203;981](https://github.com/dtolnay/syn/issues/981), tracking
issue
[rust-lang/rust#78855](https://github.com/rust-lang/rust/issues/78855))
- Parse leading vert in or-patterns
([#&#8203;982](https://github.com/dtolnay/syn/issues/982), matching
the Rust grammar change in
[rust-lang/rust#81869](https://github.com/rust-lang/rust/issues/81869))
- Parse static with omitted type
([#&#8203;983](https://github.com/dtolnay/syn/issues/983))
- Parse placeholder type in type parameter position
([#&#8203;984](https://github.com/dtolnay/syn/issues/984))

### [`v1.0.64`](https://github.com/dtolnay/syn/releases/tag/1.0.64)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.63...1.0.64)

- Avoid `clippy::expl_impl_clone_on_copy` pedantic lint in downstream
custom token types
([#&#8203;976](https://github.com/dtolnay/syn/issues/976))

### [`v1.0.63`](https://github.com/dtolnay/syn/releases/tag/1.0.63)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.62...1.0.63)

- Fix parsing associated types with empty trait bound list after colon
([#&#8203;974](https://github.com/dtolnay/syn/issues/974))

### [`v1.0.62`](https://github.com/dtolnay/syn/releases/tag/1.0.62)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.61...1.0.62)

- Republish to work around docs.rs bug
[https://github.com/rust-lang/docs.rs/issues/1300](https://github.com/rust-lang/docs.rs/issues/1300)

### [`v1.0.61`](https://github.com/dtolnay/syn/releases/tag/1.0.61)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.60...1.0.61)

- Improve assertion failures on invalid use of `Punctuated` API
([#&#8203;970](https://github.com/dtolnay/syn/issues/970), thanks
[@&#8203;osa1](https://github.com/osa1))
- Add `Lifetime::span` and `Lifetime::set_span` accessors
([#&#8203;971](https://github.com/dtolnay/syn/issues/971))

### [`v1.0.60`](https://github.com/dtolnay/syn/releases/tag/1.0.60)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.59...1.0.60)

- Provide an idiom for testing exhaustiveness of pattern matches on
`Expr`, `Type`, `Pat`, `Item`, `ForeignItem`, `TraitItem`, and
`ImplItem` ([#&#8203;694](https://github.com/dtolnay/syn/issues/694))

    ```rust
    match expr {
        Expr::Array(e) => {...}
        Expr::Assign(e) => {...}
        ...
        Expr::Yield(e) => {...}

        #[cfg(test)]
        Expr::__TestExhaustive(_) => unimplemented!(),
        #[cfg(not(test))]
        _ => { /* some sane fallback */ }
    }
    ```

The above is the only supported idiom for exhaustive matching of those
enum. Do not write anything differently as it is not supported.

The conditional compilation on match-arms lets us fail your tests but
not break your library when adding a variant. You will be notified by a
test failure when a variant is added, so that you can add code to handle
it, but your library will continue to compile and work for downstream
users in the interim.

### [`v1.0.59`](https://github.com/dtolnay/syn/releases/tag/1.0.59)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.58...1.0.59)

- Parse empty supertrait lists consistently with rustc
([#&#8203;952](https://github.com/dtolnay/syn/issues/952))
- Fix loss of span information on comma tokens inside of Type::Tuple
during parse
([#&#8203;959](https://github.com/dtolnay/syn/issues/959))

### [`v1.0.58`](https://github.com/dtolnay/syn/releases/tag/1.0.58)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.57...1.0.58)

- Allow literals to parse as a const generic path argument even without
"full" feature enabled
([#&#8203;951](https://github.com/dtolnay/syn/issues/951))

    ```rust
    pub struct Struct {
        array: Array<10>,  // used to require `features = "full"`
    }
    ```

### [`v1.0.57`](https://github.com/dtolnay/syn/releases/tag/1.0.57)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.56...1.0.57)

- Make Punctuated::new available as a `const fn`
([#&#8203;949](https://github.com/dtolnay/syn/issues/949))

### [`v1.0.56`](https://github.com/dtolnay/syn/releases/tag/1.0.56)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.55...1.0.56)

- Add
[`Error::into_compile_error`](https://docs.rs/syn/1.0.56/syn/struct.Error.html#method.into_compile_error)

### [`v1.0.55`](https://github.com/dtolnay/syn/releases/tag/1.0.55)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.54...1.0.55)

- Preserve None-delimited group around macro metavariable when parsing
`T<$ty>` ([#&#8203;944](https://github.com/dtolnay/syn/issues/944),
[#&#8203;945](https://github.com/dtolnay/syn/issues/945))

### [`v1.0.54`](https://github.com/dtolnay/syn/releases/tag/1.0.54)

[Compare
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- Fix parsing of `impl` items with macro metavariable in the trait path:
`impl $trait for Type {...}`
([#&#8203;942](https://github.com/dtolnay/syn/issues/942))

### [`v1.0.53`](https://github.com/dtolnay/syn/releases/tag/1.0.53)

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- Parse `impl !Trait {...}` syntax
([#&#8203;936](https://github.com/dtolnay/syn/issues/936))

### [`v1.0.52`](https://github.com/dtolnay/syn/releases/tag/1.0.52)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.51...1.0.52)

- Parse `unsafe extern` block syntax
([#&#8203;918](https://github.com/dtolnay/syn/issues/918))
- Parse `unsafe mod` syntax
([#&#8203;919](https://github.com/dtolnay/syn/issues/919))
- Parse `const {...}` block syntax
([#&#8203;921](https://github.com/dtolnay/syn/issues/921))
- Parse destructuring assignment syntax
([#&#8203;933](https://github.com/dtolnay/syn/issues/933))

### [`v1.0.51`](https://github.com/dtolnay/syn/releases/tag/1.0.51)

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- Allow parsing signatures in which const generic params appear in front
of lifetime params
([#&#8203;920](https://github.com/dtolnay/syn/issues/920))

### [`v1.0.50`](https://github.com/dtolnay/syn/releases/tag/1.0.50)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.48...1.0.50)

- Apply `doc(cfg(...))` on feature gated APIs for docs.rs-rendered
documentation
([#&#8203;925](https://github.com/dtolnay/syn/issues/925))

### [`v1.0.48`](https://github.com/dtolnay/syn/releases/tag/1.0.48)

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-   Rebuild for https://astexplorer.net

### [`v1.0.47`](https://github.com/dtolnay/syn/releases/tag/1.0.47)

[Compare
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-   Documentation improvements

### [`v1.0.46`](https://github.com/dtolnay/syn/releases/tag/1.0.46)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.45...1.0.46)

- Fix parsing structured attributes that contain nested absolute paths,
such as `#[derive(::serde::Serialize)]`
([#&#8203;909](https://github.com/dtolnay/syn/issues/909))

### [`v1.0.45`](https://github.com/dtolnay/syn/releases/tag/1.0.45)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.44...1.0.45)

- Provide more detailed error messages when parsing specific literal
kind ([#&#8203;908](https://github.com/dtolnay/syn/issues/908))

### [`v1.0.44`](https://github.com/dtolnay/syn/releases/tag/1.0.44)

[Compare
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- Fix some parsing of patterns inside of None-delimited groups
([#&#8203;907](https://github.com/dtolnay/syn/issues/907))

### [`v1.0.43`](https://github.com/dtolnay/syn/releases/tag/1.0.43)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.42...1.0.43)

-   Add Parse impl for syn::Signature

### [`v1.0.42`](https://github.com/dtolnay/syn/releases/tag/1.0.42)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.41...1.0.42)

- Fix several bugs involving unusual suffixes on integer and floating
point literal tokens
([#&#8203;898](https://github.com/dtolnay/syn/issues/898),
[#&#8203;899](https://github.com/dtolnay/syn/issues/899),
[#&#8203;900](https://github.com/dtolnay/syn/issues/900))

### [`v1.0.41`](https://github.com/dtolnay/syn/releases/tag/1.0.41)

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- Fix panic on printing an incomplete (having fewer path segments than
originally parsed with) qualified path (ExprPath, PatPath, TypePath
containing QSelf)
([#&#8203;891](https://github.com/dtolnay/syn/issues/891), thanks
[@&#8203;taiki-e](https://github.com/taiki-e))
- Fix panic triggered by syntactically invalid overflowing negative
float literal after `.` in a field access position, e.g. `let _ =
obj.-0.9E999999`
([#&#8203;895](https://github.com/dtolnay/syn/issues/895), thanks
[@&#8203;sameer](https://github.com/sameer))
- Enable using `parse_macro_input!` with a Parser function rather than
type having a Parse impl
([#&#8203;896](https://github.com/dtolnay/syn/issues/896), thanks
[@&#8203;sbrocket](https://github.com/sbrocket))

### [`v1.0.40`](https://github.com/dtolnay/syn/releases/tag/1.0.40)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.39...1.0.40)

- Fix panic on parsing float literals having both an exponent and a
suffix beginning with 'e' or 'E', such as `9e99e999`
([#&#8203;893](https://github.com/dtolnay/syn/issues/893))

### [`v1.0.39`](https://github.com/dtolnay/syn/releases/tag/1.0.39)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.38...1.0.39)

- Improve compile time by pre-expanding derives
([#&#8203;885](https://github.com/dtolnay/syn/issues/885))
- Parse const generic parameters in any order relative to type
parameters ([#&#8203;886](https://github.com/dtolnay/syn/issues/886))

### [`v1.0.38`](https://github.com/dtolnay/syn/releases/tag/1.0.38)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.37...1.0.38)

- Accept traits with parenthesized path arguments in impls
([#&#8203;880](https://github.com/dtolnay/syn/issues/880), thanks
[@&#8203;alecmocatta](https://github.com/alecmocatta))

### [`v1.0.37`](https://github.com/dtolnay/syn/releases/tag/1.0.37)

[Compare
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- Handle shebang in a way that matches rustc 1.46+
([#&#8203;876](https://github.com/dtolnay/syn/issues/876),
[https://github.com/rust-lang/rust/pull/71487](https://github.com/rust-lang/rust/pull/71487),
[https://github.com/rust-lang/rust/pull/73596](https://github.com/rust-lang/rust/pull/73596))

    ```rust
    #!//am/i/a/comment

    fn main() {} // ^ shebang
    ```

    ```rust
    #!//am/i/a/comment

    [allow(dead_code)] // ^ not a shebang
    fn main() {}
    ```

- Accept <code>tuple.0.  0</code> as a tuple indexing expression
([#&#8203;877](https://github.com/dtolnay/syn/issues/877))

### [`v1.0.36`](https://github.com/dtolnay/syn/releases/tag/1.0.36)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.35...1.0.36)

- Add Lit::span, Lit::set_span
([#&#8203;874](https://github.com/dtolnay/syn/issues/874))

### [`v1.0.35`](https://github.com/dtolnay/syn/releases/tag/1.0.35)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.34...1.0.35)

- Fix parsing of Expr::Field in non-full mode
([#&#8203;870](https://github.com/dtolnay/syn/issues/870))

### [`v1.0.34`](https://github.com/dtolnay/syn/releases/tag/1.0.34)

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-   Documentation improvements

### [`v1.0.33`](https://github.com/dtolnay/syn/releases/tag/1.0.33)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.32...1.0.33)

- Parse `tuple.0.0` as an indexing expression
([https://github.com/rust-lang/rust/pull/71322](https://github.com/rust-lang/rust/pull/71322))
- Add `Parse` impls for optional of proc-macro2 types:
`Option<TokenTree>`, `Option<Punct>`, `Option<Literal>`, `Option<Group>`

### [`v1.0.32`](https://github.com/dtolnay/syn/releases/tag/1.0.32)

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- Fix parsing $:item macro_rules metavariables containing outer
attributes ([#&#8203;852](https://github.com/dtolnay/syn/issues/852))

### [`v1.0.31`](https://github.com/dtolnay/syn/releases/tag/1.0.31)

[Compare
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- Add
[`Expr::parse_without_eager_brace`](https://docs.rs/syn/1.0.31/syn/enum.Expr.html#method.parse_without_eager_brace)
to parse expressions in ambiguous syntactic position.

Rust grammar has an ambiguity where braces sometimes turn a path
expression into a struct initialization and sometimes do not. In the
following code, the expression `S {}` is one expression. Presumably
there is an empty struct `struct S {}` defined somewhere which it is
instantiating.

    ```rust
    let _ = *S {};

    // parsed by rustc as: `*(S {})`
    ```

We would want to parse the above using `Expr::parse` after the `=`
token.

    But in the following, `S {}` is *not* a struct init expression.

    ```rust
    if *S {} {}

    // parsed by rustc as:
    //
    //    if (*S) {
    //        /* empty block */
    //    }
    //    {
    //        /* another empty block */
    //    }
    ```

For that reason we would want to parse if-conditions using
`Expr::parse_without_eager_brace` after the `if` token. Same for similar
syntactic positions such as the condition expr after a `while` token or
the expr at the top of a `match`.

The Rust grammar's choices around which way this ambiguity is resolved
at various syntactic positions is fairly arbitrary. Really either parse
behavior could work in most positions, and language designers just
decide each case based on which is more likely to be what the programmer
had in mind most of the time.

    ```rust
    if return S {} {}

    // parsed by rustc as:
    //
    //    if (return (S {})) {
    //    }
    //
    // but could equally well have been this other arbitrary choice:
    //
    //    if (return S) {
    //    }
    //    {}
    ```

Note the grammar ambiguity on trailing braces is distinct from
precedence and is not captured by assigning a precedence level to the
braced struct init expr in relation to other operators. This can be
illustrated by `return 0..S {}` vs `match 0..S {}`. The former parses as
`return (0..(S {}))` implying tighter precedence for struct init than
`..`, while the latter parses as `match (0..S) {}` implying tighter
precedence for `..` than struct init, a contradiction.

### [`v1.0.30`](https://github.com/dtolnay/syn/releases/tag/1.0.30)

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Source](https://github.com/dtolnay/syn/compare/1.0.29...1.0.30)

- Parse struct init expressions where the type name is an interpolated
macro_rules metavariable, such as `$struct {}` where $struct:ident
([#&#8203;842](https://github.com/dtolnay/syn/issues/842))
- Handle nesting of None-delimited groups
([#&#8203;843](https://github.com/dtolnay/syn/issues/843), thanks
[@&#8203;Aaron1011](https://github.com/Aaron1011))

### [`v1.0.29`](https://github.com/dtolnay/syn/releases/tag/1.0.29)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.28...1.0.29)

- Parse macro call exprs where the macro name is an interpolated
macro_rules metavariable, such as `$macro!()`
([#&#8203;838](https://github.com/dtolnay/syn/issues/838))
- Parse paths containing generic parameters where the first path segment
is an interpolated macro_rules metavariable, such as `$seg<'a>`
([#&#8203;839](https://github.com/dtolnay/syn/issues/839))

### [`v1.0.28`](https://github.com/dtolnay/syn/releases/tag/1.0.28)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.27...1.0.28)

- Recognize empty None-delimited group produced by interpolating a $:vis
macro metavariable when parsing a Visibility
([#&#8203;836](https://github.com/dtolnay/syn/issues/836))

### [`v1.0.27`](https://github.com/dtolnay/syn/releases/tag/1.0.27)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.26...1.0.27)

- Parse function calls in which the callee is an interpolated macro
variable `$fn(...)`
([#&#8203;833](https://github.com/dtolnay/syn/issues/833))

### [`v1.0.26`](https://github.com/dtolnay/syn/releases/tag/1.0.26)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.25...1.0.26)

- Parse paths containing an interpolated first component, such as
`$first::rest`
([https://github.com/rust-lang/rust/issues/72608](https://github.com/rust-lang/rust/issues/72608),
[#&#8203;832](https://github.com/dtolnay/syn/issues/832))

### [`v1.0.25`](https://github.com/dtolnay/syn/releases/tag/1.0.25)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.24...1.0.25)

- Parse opt-out `?const` trait bounds
([#&#8203;767](https://github.com/dtolnay/syn/issues/767))
- Parse const generics in method generic arguments
([#&#8203;816](https://github.com/dtolnay/syn/issues/816), thanks
[@&#8203;yodaldevoid](https://github.com/yodaldevoid))
- Parse trait bounds on type alias items
([#&#8203;821](https://github.com/dtolnay/syn/issues/821))
- Parse const generics on impl blocks
([#&#8203;822](https://github.com/dtolnay/syn/issues/822))
- Fix precedence of attributes on binary expressions to match rustc
([#&#8203;823](https://github.com/dtolnay/syn/issues/823))
- Remove parsing of `extern::` paths which were removed from nightly in
January 2019
([#&#8203;825](https://github.com/dtolnay/syn/issues/825),
[https://github.com/rust-lang/rust/pull/57572](https://github.com/rust-lang/rust/pull/57572))
- Add `Punctuated::clear`, analogous to Vec::clear
([#&#8203;828](https://github.com/dtolnay/syn/issues/828))

### [`v1.0.24`](https://github.com/dtolnay/syn/releases/tag/1.0.24)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.23...1.0.24)

- Parse `mut self` receiver in function pointer type
([#&#8203;812](https://github.com/dtolnay/syn/issues/812),
[#&#8203;814](https://github.com/dtolnay/syn/issues/814))
- Parse const trait impls
([#&#8203;813](https://github.com/dtolnay/syn/issues/813))
- Improve error reporting inside struct expressions and struct patterns
([#&#8203;818](https://github.com/dtolnay/syn/issues/818))

### [`v1.0.23`](https://github.com/dtolnay/syn/releases/tag/1.0.23)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.22...1.0.23)

- Parse inner attributes in traits
([#&#8203;803](https://github.com/dtolnay/syn/issues/803))
- Parse const underscore in traits and impls
([#&#8203;804](https://github.com/dtolnay/syn/issues/804))
- Implement Extend<Error> for Error
([#&#8203;805](https://github.com/dtolnay/syn/issues/805))
- Parse Or patterns
([#&#8203;806](https://github.com/dtolnay/syn/issues/806))
- Parse outer attributes on Expr\* structs
([#&#8203;807](https://github.com/dtolnay/syn/issues/807))
- Parse top level const/static without value
([#&#8203;808](https://github.com/dtolnay/syn/issues/808))
- Parse syntactically accepted functions
([#&#8203;809](https://github.com/dtolnay/syn/issues/809))
- Parse extern static with value
([#&#8203;810](https://github.com/dtolnay/syn/issues/810))

Thanks [@&#8203;taiki-e](https://github.com/taiki-e) for all of these.

### [`v1.0.22`](https://github.com/dtolnay/syn/releases/tag/1.0.22)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.21...1.0.22)

- Parse literal suffix on byte string, byte, and char literal tokens:
`br#"..."#suffix`, `b'?'suffix`, `'?'suffix`
([#&#8203;799](https://github.com/dtolnay/syn/issues/799),
[#&#8203;800](https://github.com/dtolnay/syn/issues/800))

### [`v1.0.21`](https://github.com/dtolnay/syn/releases/tag/1.0.21)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.20...1.0.21)

-   Documentation improvements

### [`v1.0.20`](https://github.com/dtolnay/syn/releases/tag/1.0.20)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.19...1.0.20)

- Improve span of error message when an error during
`syn::Macro::parse_body` is triggered past the last token of the macro
body ([#&#8203;791](https://github.com/dtolnay/syn/issues/791))

### [`v1.0.19`](https://github.com/dtolnay/syn/releases/tag/1.0.19)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.18...1.0.19)

- Parse a more lenient extern type syntax inside extern blocks
([#&#8203;763](https://github.com/dtolnay/syn/issues/763))

### [`v1.0.18`](https://github.com/dtolnay/syn/releases/tag/1.0.18)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.17...1.0.18)

- Ignore unparsed empty None-delimited groups at the end of a macro
input ([#&#8203;783](https://github.com/dtolnay/syn/issues/783))

### [`v1.0.17`](https://github.com/dtolnay/syn/releases/tag/1.0.17)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.16...1.0.17)

-   Expose `syn::Lit` in `default-features = false` mode

### [`v1.0.16`](https://github.com/dtolnay/syn/releases/tag/1.0.16)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.15...1.0.16)

- Fix parsing of `&raw` raw reference operator
([https://github.com/rust-lang/rust/issues/64490](https://github.com/rust-lang/rust/issues/64490))
to require explicitly specified constness, `&raw mut` or `&raw const`

### [`v1.0.15`](https://github.com/dtolnay/syn/releases/tag/1.0.15)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.14...1.0.15)

- Add
[`Punctuated::first_mut`](https://docs.rs/syn/1.0.15/syn/punctuated/struct.Punctuated.html#method.first_mut)
to return a mut reference to the first sequence element

### [`v1.0.14`](https://github.com/dtolnay/syn/releases/tag/1.0.14)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.13...1.0.14)

- Produce more helpful error messages from
[Attribute::parse_args](https://docs.rs/syn/1.0/syn/struct.Attribute.html#method.parse_args)

### [`v1.0.13`](https://github.com/dtolnay/syn/releases/tag/1.0.13)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.12...1.0.13)

- Allow parse_quote! to parse Vec\<Stmt>, with the same behavior as
Block::parse_within
([#&#8203;741](https://github.com/dtolnay/syn/issues/741))

### [`v1.0.12`](https://github.com/dtolnay/syn/releases/tag/1.0.12)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.11...1.0.12)

- Reject function signatures with an incorrectly placed receiver
parameter, like `fn f(x: u8, &self)`
- Produce correctly spanned error when parsing punct beyond the end of a
delimited group
([#&#8203;739](https://github.com/dtolnay/syn/issues/739))

### [`v1.0.11`](https://github.com/dtolnay/syn/releases/tag/1.0.11)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.10...1.0.11)

- Implement quote::IdentFragment for syn::Member and syn::Index so that
spans are preserved when using these types in quote's `format_ident!`
macro

    ```rust
    use quote::format_ident;
    use syn::Index;

    let index: Index = /* ... */;
    let ident = format_ident!("__{}", index); // produces __0, __1, etc
    ```

### [`v1.0.10`](https://github.com/dtolnay/syn/releases/tag/1.0.10)

[Compare
Source](https://github.com/dtolnay/syn/compare/1.0.9...1.0.10)

- Provide `Hash` and `Eq` impls for syn::Member even without
"extra-traits" feature enabled, as this type is commonly useful in a
hashset

### [`v1.0.9`](https://github.com/dtolnay/syn/releases/tag/1.0.9)

[Compare Source](https://github.com/dtolnay/syn/compare/1.0.8...1.0.9)

- Fix failure to parse tuple struct fields of tuple type starting with
`crate` ([#&#8203;720](https://github.com/dtolnay/syn/issues/720),
[#&#8203;723](https://github.com/dtolnay/syn/issues/723), thanks
[@&#8203;mystor](https://github.com/mystor))
- Fix unexpected tokens being ignored when using Speculative::advance_to
([#&#8203;721](https://github.com/dtolnay/syn/issues/721),
[#&#8203;723](https://github.com/dtolnay/syn/issues/723), thank

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