Bump syn from 2.0.60 to 2.0.66

[dependabot]

Bumps syn from 2.0.60 to 2.0.66.

Release notes

Sourced from syn's releases.

2.0.66

• Allow braced structs when parsing ExprLet (#1671)

2.0.65

• Optimize the implementation of Fold to compile faster (#1666, #1667, #1668)

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)

Commits

• b992916 Release 2.0.66
• 4f0a23f Merge pull request #1671 from dtolnay/exprlet
• c6d87a7 Allow braced structs when parsing ExprLet
• 747f42f Update with proc-macro2 1.0.83's syntax tree sizes
• 9f2371e Release 2.0.65
• 4cd1813 Merge pull request #1668 from dtolnay/foldhelper
• ed54092 Eliminate gen::helper module
• eacc8ab Eliminate FoldHelper trait
• 6e20bb8 Merge pull request #1667 from dtolnay/punctuatedfold
• 9d95cab Optimize punctuated::fold
• Additional commits viewable in compare view

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The following labels could not be found: rust, Changed.

[coveralls-official]

Pull Request Test Coverage Report for Build 9308267918

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 83.83%

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Totals
Change from base Build 9308256146:	0.0%
Covered Lines:	12624
Relevant Lines:	15059

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💛 - Coveralls

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Closed by #560