Bump syn from 0.15.40 to 1.0.51

[dependabot-preview]

Bumps syn from 0.15.40 to 1.0.51.

Release notes

Sourced from syn's releases.

1.0.51

• Allow parsing signatures in which const generic params appear in front of lifetime params (#920)

1.0.50

• Apply doc(cfg(...)) on feature gated APIs for docs.rs-rendered documentation (#925)

1.0.49

• Fix parsing async functions inside None-delimited groups in a statement context (#916)

1.0.48

• Rebuild for https://astexplorer.net

1.0.47

• Documentation improvements

1.0.46

• Fix parsing structured attributes that contain nested absolute paths, such as #[derive(::serde::Serialize)] (#909)

1.0.45

• Provide more detailed error messages when parsing specific literal kind (#908)

1.0.44

• Fix some parsing of patterns inside of None-delimited groups (#907)

1.0.43

• Add Parse impl for syn::Signature

1.0.42

• Fix several bugs involving unusual suffixes on integer and floating point literal tokens (#898, #899, #900)

1.0.41

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

1.0.40

• Fix panic on parsing float literals having both an exponent and a suffix beginning with 'e' or 'E', such as 9e99e999 (#893)

1.0.39

• Improve compile time by pre-expanding derives (#885)
• Parse const generic parameters in any order relative to type parameters (#886)

1.0.38

• Accept traits with parenthesized path arguments in impls (#880, thanks @alecmocatta)

1.0.37

• Handle shebang in a way that matches rustc 1.46+ (#876, rust-lang/rust#71487, rust-lang/rust#73596)

  #!//am/i/a/comment

Commits

• 7092ee5 Release 1.0.51
• 33323b6 Normalize syntax tree before roundtrip comparison
• ee54e51 Remove unused rustc import from test suite
• 28df47f Ignore FnDecl params containing dummy TyKind
• 93ded1a Do full comparison of literals inside token stream
• 37c5e4c Do full comparison of token::Lit symbols
• 6ba2193 Normalize doc comments inside TokenStream for comparison
• 6de5e20 Compare doc comment and doc attribute as equal in roundtrip test
• f4c65bc Work around ParseSess cache in test_round_trip
• a006013 Support qualified path in structual spanless eq macros
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #620.