Bump syn from 1.0.55 to 1.0.67

[dependabot]

Bumps syn from 1.0.55 to 1.0.67.

Release notes

Sourced from syn's releases.

1.0.67

• Accept outer attributes in the Parse impl of ExprBlock (#1004)

1.0.66

• Parse equality constraints on generic associated types (#979)
• Parse default value exprs in const generic declarations (#980)
• Fix infinite loop parsing malformed type ascription expression in non-full mode (#978)
• Improve Parse impls of ExprArray, ExprAsync, ExprBlock, ExprMacro, ExprParen, ExprRepeat, ExprStruct, ExprTryBlock, ExprUnsafe to succeed parsing even in the presence of trailing binary operators (#991, #992, #993, #994, #995, #996, #997, #998, #999)

1.0.65

• Parse visibility on macro_rules (#981, tracking issue rust-lang/rust#78855)
• Parse leading vert in or-patterns (#982, matching the Rust grammar change in rust-lang/rust#81869)
• Parse static with omitted type (#983)
• Parse placeholder type in type parameter position (#984)

1.0.64

• Avoid clippy::expl_impl_clone_on_copy pedantic lint in downstream custom token types (#976)

1.0.63

• Fix parsing associated types with empty trait bound list after colon (#974)

1.0.62

• Republish to work around docs.rs bug rust-lang/docs.rs#1300

1.0.61

• Improve assertion failures on invalid use of Punctuated API (#970, thanks @​osa1)
• Add Lifetime::span and Lifetime::set_span accessors (#971)

1.0.60

• Provide an idiom for testing exhaustiveness of pattern matches on Expr, Type, Pat, Item, ForeignItem, TraitItem, and ImplItem (#694)

  match expr {
      Expr::Array(e) => {...}
      Expr::Assign(e) => {...}
      ...
      Expr::Yield(e) => {...}
  #[cfg(test)]
  Expr::__TestExhaustive(_) => unimplemented!(),
  #[cfg(not(test))]
  _ => { /* some sane fallback */ }
  
  }

  The above is the only supported idiom for exhaustive matching of those enum. Do not write anything differently as it is not supported.

  The conditional compilation on match-arms lets us fail your tests but not break your library when adding a variant. You will be notified by a test failure when a variant is added, so that you can add code to handle it, but your library will continue to compile and work for downstream users in the interim.

1.0.59

... (truncated)

Commits

• eede299 Release 1.0.67
• 359297f Merge pull request #1004 from dtolnay/blockattr
• 310df0c Parse outer attrs on ExprBlock
• ee66f12 Release 1.0.66
• c37d618 Merge pull request #1002 from dtolnay/castprecedence
• 5ced044 Report no precedence for : binary operator in non-full mode
• 725fca7 Merge pull request #1001 from dtolnay/gat
• 69e5f70 Resolve collapsible_if lint in generic associated type equality parsing
• d3b0276 Parse generic associated type equality constraint
• 1a31fb2 Merge pull request #1000 from dtolnay/constdefault
• Additional commits viewable in compare view

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