Bump syn from 1.0.109 to 2.0.39

[dependabot[bot]]

Bumps syn from 1.0.109 to 2.0.39.

Release notes

Sourced from syn's releases.

2.0.39

• Fix parsing of return expression in match guards (#1528)
• Improve error message on labeled loop as value expression for break (#1531)

2.0.38

• Fix "method 'peek' has an incompatible type for trait" error when defining bool as a custom keyword (#1518, thanks @​Vanille-N)

2.0.37

• Work around incorrect future compatibility warning in rustc 1.74.0-nightly

2.0.36

• Restore compatibility with --generate-link-to-definition documentation builds (#1514)

2.0.35

• Make rust-analyzer produce preferred brackets for invocations of Token! macro (#1510, #1512)

2.0.34

• Documentation improvements

2.0.33

• Special handling for the (/*ERROR*/) placeholder that rustc uses for macros that fail to expand

2.0.32

• Add Path::require_ident accessor (#1496, thanks @​Fancyflame)

2.0.31

• Parse generics and where-clause on const items (rust-lang/rust#113521)

2.0.30

• Parse unnamed struct/union type syntax (rust-lang/rust#49804)

2.0.29

• Partially work around rust-analyzer bug (rust-lang/rust-analyzer#9911)

2.0.28

• Fix inconsistency between full and non-full expression parse errors (#1491)

2.0.27

• Documentation improvements (thanks @​GuillaumeGomez)

2.0.26

• Implement Spanned for QSelf (#1465)

2.0.25

• Support single identifier as unbraced const generic argument (#1483)
• Produce error message when LitStr::parse is used on a suffixed string literal (#1484)

2.0.24

• Fix duplication of braces around const generic argument in non-full mode (#1482)

... (truncated)

Commits

• 924217c Release 2.0.39
• 95aeeb5 Merge pull request #1531 from dtolnay/breaklabel
• b88f86f Ignore single_element_loop clippy lint in test
• a876185 Improve error on break followed by labeled loop
• 32ab979 Add test of ambiguous label parsing in break
• 6f658f8 Merge pull request #1530 from dtolnay/canbeginexpr
• 20497e1 More precise decision to parse expression after return keyword
• c6a651a Update name of ExprReturn parse function to match variant name
• c274590 Indicate that peek argument refers to syn::Ident
• 3e67cb0 Merge pull request #1529 from dtolnay/up
• Additional commits viewable in compare view

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