build(deps): bump syn from 1.0.69 to 1.0.81

[dependabot]

Bumps syn from 1.0.69 to 1.0.81.

Release notes

Sourced from syn's releases.

1.0.81

• Support arbitrary precision negative literal tokens on rustc 1.56+ (#1087, #1088)

1.0.80

• Parse unstable ~const syntax in where-clauses (#1083, tracking issue rust-lang/rust#67792)

1.0.79

• Support trailing + in dyn Trait syntax, including bare (non-dyn) pre-2018 trait object syntax (#1075, #1077, #1078, #1079, #1080, #1081)

1.0.78

• Parse trailing + in the bounds of impl Trait type (#1073)

1.0.77

• Match Rust 1.57+'s parsing of dot and question mark after a curly braced macro invocation (#1068)

1.0.76

• Parse unstable let–else syntax (#1050, #1057)
• Parse qualified braced variant expressions and patterns: <E>::V {..} (#1058, #1059)
• Fix precedence of outer attributes in front of an assignment expression in statement position (#1060)

1.0.75

• Improve spans on a method without body inside an impl block
• Documentation improvements (#922, thanks @​Tamschi)

1.0.74

• Reject for<'a> dyn Trait<'a> syntax; the correct representation is dyn for<'a> Trait<'a> (#1042)

1.0.73

• Add From<Ident>, From<Index>, From<usize> for Member (#1038, thanks @​m-ou-se)

1.0.72

• Parse const generics which use value of a previous const generic parameter as a default value (#1027)

1.0.71

• Fix panic deserializing an ItemImpl with a non-path in trait position (#1023)
• Parse visibility on impl blocks (#1024)
• Fix parsing a type parameter default on the first generic parameter of an impl block (#1025, thanks @​taiki-e)

1.0.70

• Fix precedence of closure body vs ExprRange rhs: || .. .method() (#1019)
• Parse inner attributes inside of structs and enums (#1022)

Commits

• 6044282 Release 1.0.81
• f39a581 Merge pull request #1088 from dtolnay/literalparse
• 0ca31d1 Delete lit overflow test
• 793b1c3 Pull in proc-macro2 negative literal support
• 3609334 Link to rustc PR for negative literal parse
• a7eedc1 Locally ignore unnecessary_wraps pedantic clippy lint
• d9a9ff4 Bypass negative literal workaround on 1.56+
• 30984ec Merge pull request #1087 from dtolnay/literalparse
• 0fda5ad Use 'FromStr for Literal' instead of TokenStream workaround
• 68e7ab8 Suppress no_effect_underscore_binding pedantic Clippy lint in test suite
• Additional commits viewable in compare view

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.38%. Comparing base (eb24a28) to head (6774b85).
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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #270   +/-   ##
========================================
  Coverage    68.38%   68.38%           
========================================
  Files           28       28           
  Lines         1186     1186           
========================================
  Hits           811      811           
  Misses         375      375           

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[dependabot]

Superseded by #274.