Bump syn from 1.0.51 to 1.0.68 in /oak_loader

[dependabot]

Bumps syn from 1.0.51 to 1.0.68.

Release notes

Sourced from syn's releases.

1.0.68

• Preserve span of LexError on conversion to syn::Error (#1006)

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.

... (truncated)

Commits

• 2ad23f2 Release 1.0.68
• d354188 Merge pull request #1006 from dtolnay/lexerror
• 28915db Preserve span of LexError on conversion to syn::Error
• 16781e7 Update test suite to nightly-2021-03-30
• 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
• Additional commits viewable in compare view

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[dependabot]

Superseded by #34.