Bump syn from 1.0.48 to 1.0.57

[dependabot]

Bumps syn from 1.0.48 to 1.0.57.

Release notes

Sourced from syn's releases.

1.0.57

• Make Punctuated::new available as a const fn (#949)

1.0.56

• Add Error::into_compile_error

1.0.55

• Preserve None-delimited group around macro metavariable when parsing T<$ty> (#944, #945)

1.0.54

• Fix parsing of impl items with macro metavariable in the trait path: impl $trait for Type {...} (#942)

1.0.53

• Parse impl !Trait {...} syntax (#936)

1.0.52

• Parse unsafe extern block syntax (#918)
• Parse unsafe mod syntax (#919)
• Parse const {...} block syntax (#921)
• Parse destructuring assignment syntax (#933)

1.0.51

• Allow parsing signatures in which const generic params appear in front of lifetime params (#920)

1.0.50

• Apply doc(cfg(...)) on feature gated APIs for docs.rs-rendered documentation (#925)

1.0.49

• Fix parsing async functions inside None-delimited groups in a statement context (#916)

Commits

• d58d7cb Release 1.0.57
• a43539c Resolve use_self clippy lint
• 7ca5691 Remove no longer triggered clippy lints
• 875eb74 Format with rustfmt 1.4.30-nightly
• 9203f69 Merge pull request #949 from dtolnay/const
• f2b69c4 Make Punctuated::new const fn on rustc 1.39+
• 0211762 Merge pull request #948 from dtolnay/rustfmt
• a632de1 Update internal code generator to rustfmt 2.0.0-rc.2
• 71f401c Resolve redundant_semicolons lint in test suite
• e220fff Inform clippy of supported compiler version in clippy.toml
• Additional commits viewable in compare view

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[dependabot]

The following labels could not be found: A2-insubstantial, B0-silent, C1-low.

[dependabot]

Superseded by #13.