Bump syn from 0.15.40 to 1.0.35

[dependabot-preview[bot]]

Bumps syn from 0.15.40 to 1.0.35.

Release notes

Sourced from syn's releases.

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.

  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.

  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.

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

Commits

• ba2b69a Release 1.0.35
• b114793 Fix double parse of dot token in non-full mode
• ff578f1 Remove support note from readme
• 0af800c Quote no longer requires recursion
• 3721a20 Update test suite to nightly-2020-07-16
• 7ab667f Suppress match_like_matches_macro clippy lint
• a7953b0 Suppress option_if_let_else clippy pedantic lint
• 2f88d8f Release 1.0.34
• 4913b10 Add example expansion to parse_macro_input documentation
• d5bdf68 Update test suite to nightly-2020-07-11
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #599.