Update Rust crate syn to 1.0.109

[renovate]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
syn	dependencies	patch	1.0.109	source

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

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Release Notes

dtolnay/syn (syn)

v1.0.109

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v1.0.108

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• Fix handling of unusual whitespace after escaped newlines in LitStr::value (#​1381, thanks @​ModProg)

v1.0.107

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

v1.0.106

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• Documentation improvements

v1.0.105

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• Improve parse errors related to dyn and impl type syntax (#​1245)

v1.0.104

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• Add PathArguments::is_none()

v1.0.103

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• Implement PartialOrd for Cursor (#​1236, #​1237, thanks @​CAD97)

v1.0.102

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• More efficient internal representation for TokenBuffer (#​1223, thanks @​CAD97)
• Fix parsing of a left shift after macro metavariable in type position (#​1229)

v1.0.101

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• Eliminate a bunch of redundant work done by LitStr::parse (#​1221)

v1.0.100

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

v1.0.99

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• Add categories and keywords to crates.io metadata

v1.0.98

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• Format example code with rustfmt

v1.0.97

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• Update examples

v1.0.96

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• Add a punct_mut() method on syn::punctuated::Pair to return Option<&mut P> (#​1183)

v1.0.95

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

v1.0.94

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• Resolve some unused_macro_rules warnings

v1.0.93

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• Fix compile error when Some means something unusual in the expression namespace of the scope where custom_keyword is invoked (#​1171, thanks @​zakarumych)

v1.0.92

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• Make compatible with Miri's tag-raw-pointers mode (#​1166, thanks @​saethlin)

v1.0.91

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

v1.0.90

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• Update recommended exhaustive matching idiom to use non_exhaustive_omitted_patterns lint:

  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

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• Remove support for inner attributes on non-block expressions (#​1146, rust-lang/rust#83312)
• Fix panic on comma after mut self in a bare fn type (#​1148)

v1.0.88

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• Parse .. pattern in pattern of let (#​1136)
• Parse for<…> lifetime introducer on closures (#​1135)
• Reject postfix operators after cast (#​1117)
• Implement extra-traits for Nothing (#​1144)

v1.0.87

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• Parse trait bounds containing associated constant constraint (#​1138)
• Change syntax of where-clauses on generic associated types (#​1071, rust-lang/rust#89122)

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