Bump syn from 1.0.89 to 1.0.90

[dependabot]

Bumps syn from 1.0.89 to 1.0.90.

Release notes

Sourced from syn's releases.

1.0.90

• Update recommended exhaustive matching idiom to use non_exhaustive_omitted_patterns lint:

  match expr {
      Expr::Array(e) => {…}
      Expr::Assign(e) => {…}
      ...
      Expr::Yield(e) => {…}
  #[cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
  _ => {/* some sane fallback */}
  
  }

Commits

• a0f0bb3 Release 1.0.90
• be520c1 Merge pull request #1067 from dtolnay/nonexhaustive
• c6ce512 Switch non exhaustive syntax tree enums to use #[non_exhaustive]
• 390e0c1 Move path printing to a pub(crate) function
• d545093 Fix up variable names in exhaustive matching idiom comments
• c1a63c4 Fix unused associated constant warning
• 3d72c80 Factor out placeholder to DUMMY const
• a0ed0d3 Replace placeholder to avoid round trip over proc macro bridge
• a9759cf Replace meaningless placeholder with one of the legit expr variants
• 5796d98 Update generated modules at prettyplease 0.1.8
• See full diff in compare view

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