Bump syn from 1.0.38 to 1.0.46

[dependabot-preview]

Bumps syn from 1.0.38 to 1.0.46.

Release notes

Sourced from syn's releases.

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

1.0.42

• Fix several bugs involving unusual suffixes on integer and floating point literal tokens (#898, #899, #900)

1.0.41

• Fix panic on printing an incomplete (having fewer path segments than originally parsed with) qualified path (ExprPath, PatPath, TypePath containing QSelf) (#891, thanks @taiki-e)
• Fix panic triggered by syntactically invalid overflowing negative float literal after . in a field access position, e.g. let _ = obj.-0.9E999999 (#895, thanks @sameer)
• Enable using parse_macro_input! with a Parser function rather than type having a Parse impl (#896, thanks @sbrocket)

1.0.40

• Fix panic on parsing float literals having both an exponent and a suffix beginning with 'e' or 'E', such as 9e99e999 (#893)

1.0.39

• Improve compile time by pre-expanding derives (#885)
• Parse const generic parameters in any order relative to type parameters (#886)

Commits

• cb2c268 Release 1.0.46
• e393b44 Merge pull request #910 from dtolnay/absmeta
• 9a568a8 Fix parsing an absolute nested meta path
• bf0d06b Add test of parsing absolute path as Meta
• 8c81219 Update test suite to nightly-2020-10-18
• 41622da Release 1.0.45
• 0db160e Merge pull request #908 from dtolnay/expectliteral
• 18ccb5b Provide more detailed error when parsing specific literal kind
• 1e4e050 Add test of Lit parsing error message
• a9b648c Release 1.0.44
• Additional commits viewable in compare view

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Superseded by #27721.