Bump syn from 0.15.40 to 1.0.40

[dependabot-preview]

Bumps syn from 0.15.40 to 1.0.40.

Release notes

Sourced from syn's releases.

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
  fn main() {} // ^ shebang

  #!//am/i/a/comment
  [allow(dead_code)] // ^ not a shebang
  fn main() {}

• Accept tuple.0.  0 as a tuple indexing expression (#877)

1.0.36

• Add Lit::span, Lit::set_span (#874)

1.0.35

• Fix parsing of Expr::Field in non-full mode (#870)

1.0.34

• Documentation improvements

1.0.33

• Parse tuple.0.0 as an indexing expression (rust-lang/rust#71322)
• Add Parse impls for optional of proc-macro2 types: Option<TokenTree>, Option<Punct>, Option<Literal>, Option<Group>

1.0.32

• Fix parsing $:item macro_rules metavariables containing outer attributes (#852)

1.0.31

• Add Expr::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.

Commits

• b66b940 Release 1.0.40
• 9a51f1c Merge pull request #894 from dtolnay/float
• 63ccc27 Allow 'e' as first character of float suffix
• c2ef263 Add test of suffix on a float literal
• 19f8297 Update generated code with proc-macro2 1.0.20's formatting
• ec38881 Update tokenstream whitespace for proc-macro2 1.0.20
• aad8e4b Update test suite to nightly-2020-09-03
• 0b3145d Replace double check on Option with 'if let'
• 9fa964d Update test suite to nightly-2020-08-24
• 7f7d995 Update test suite to nightly-2020-08-22
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #606.