Bump syn from 2.0.52 to 2.0.64

[dependabot[bot]]

Bumps syn from 2.0.52 to 2.0.64.

Release notes

Sourced from syn's releases.

2.0.64

• Support using ParseBuffer across catch_unwind (#1646)
• Validate that the expression in a let-else ends in brace as required by rustc (#1648, #1649)
• Legalize invalid const generic arguments by wrapping in braces (#1654, #1655)
• Fix some expression precedence edge cases involving break and return in loop headers (#1656)
• Always print closure bodies with a brace when the closure has an explicit return type (#1658)
• Automatically insert necessary parentheses in ToTokens for Expr when required by expression precedence (#1659)
• Support struct literal syntax in match guard expressions (#1662)

2.0.63

• Parse and print long if-else-if chains without reliance on deep recursion to avoid overflowing stack (#1644, #1645)

2.0.62

• Reject invalid unparenthesized range and comparison operator expressions (#1642, #1643)

2.0.61

• Check for legal binding name in the ident of Pat::Ident (#1627)
• Resolve unexpected_cfgs warning (#1635)

2.0.60

• Improve how None-delimited groups are counted by peek (#1625)

2.0.59

• Parse c"…" and cr"…" C-string literal syntax as Lit::CStr (#1502)

2.0.58

• Support $ in custom_punctuation! macro (#1611)

2.0.57

• Eliminate dependency on quote when built with default-features disabled and the "proc-macro" feature enabled (#1608, thanks @​BD103)

2.0.56

• Apply RUSTC_WORKSPACE_WRAPPER when deciding whether to run nightly-only tests (#1605)

2.0.55

• Restore compatibility with rustc 1.56 through 1.59 (#1603)

2.0.54

• Fix dead code warning in generated code when using custom_keyword! with syn's "printing" feature disabled (#1602)

2.0.53

• Implement Copy, Clone, and ToTokens for syn::parse::Nothing (#1597)

Commits

• 98a62cb Release 2.0.64
• 1f8eddb Merge pull request #1662 from dtolnay/guardstruct
• 0a3d3bd Fix parsing of struct literal in match guard expression
• f464193 Merge pull request #1659 from dtolnay/needspar
• afa1c72 Add more auto-parenthesization tests
• 532d3a3 Insert necessary parentheses in ToTokens for Expr
• 1b6a450 Add test of parenthesis insertion by Expr's ToTokens
• 83ea289 Merge pull request #1658 from dtolnay/closurebrace
• 206d897 Create braces around closure body during printing if needed
• 9b60027 Ignore struct_excessive_bools pedantic clippy lint
• Additional commits viewable in compare view

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Superseded by #50.