Bump syn from 1.0.42 to 1.0.52

[dependabot-preview[bot]]

Bumps syn from 1.0.42 to 1.0.52.

Release notes

Sourced from syn's releases.

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)

1.0.48

• Rebuild for https://astexplorer.net

1.0.47

• Documentation improvements

1.0.46

• Fix parsing structured attributes that contain nested absolute paths, such as #[derive(::serde::Serialize)] (#909)

1.0.45

• Provide more detailed error messages when parsing specific literal kind (#908)

1.0.44

• Fix some parsing of patterns inside of None-delimited groups (#907)

1.0.43

• Add Parse impl for syn::Signature

Commits

• d8dde48 Release 1.0.52
• 530f2c7 Merge pull request #934 from dtolnay/destructuring-assignment
• 8ae9129 Parse destructuring assignment
• 785c8c9 Update test suite to nightly-2020-11-27
• a050914 Handle printing ?const type param bounds that are not the first bound
• de4d2d1 Flatten verbatim expr into verbatim pat
• d327248 Merge pull request #932 from dtolnay/constblock-range
• b2e975d Parse const blocks in range patterns
• cf110e3 Merge pull request #931 from dtolnay/constblock-pat
• 98a5e9b Parse const blocks in pattern position
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #180.