Bump syn from 1.0.109 to 2.0.18

[dependabot]

Bumps syn from 1.0.109 to 2.0.18.

Release notes

Sourced from syn's releases.

2.0.18

• Permit empty attr in syn::meta::parser (#1460)

2.0.17

• Enable proc_macro support on wasm targets (#1459)

2.0.16

• Parse builtin # syntax as Expr::Verbatim (rust-lang/rust#110680, #1454)

2.0.15

• Ensure Type::Tuple of length 1 prints as a tuple even if trailing comma is not provided in the Punctuated (#1444, thanks @​Fancyflame)

2.0.14

• Add Punctuated::pop_punct() (#1442, thanks @​programmerjake)

2.0.13

• Improve spans of Expr::Field parsed from a float Literal (#1433, #1436)

2.0.12

• Refer to compile_error! by absolute path in token stream produced by syn::Error::to_compile_error (#1431, thanks @​smoelius)

2.0.11

• Improve error message on empty parens inside parse_nested_meta (#1428)

2.0.10

• Fix visibility being parsed incorrectly on macro invocations inside of a trait

2.0.9

• Disallow type items in an extern block, trait, or module from being marked default

2.0.8

• Treat try keyword as 2015-edition identifier in definition of try macro (#1422)

2.0.7

• Fix parsing of mut self inside of Type::BareFn

2.0.6

• Improve error message on missing ';' between statements (#1419)
• Keep non-brace macro invocations in trailing expr position as Expr::Macro (#1420)

2.0.5

• Expose ExprMacro data structure even when features="full" is not used (#1417)

2.0.4

• Improve error reporting when parsing identifiers and paths (#1415, #1416)

2.0.3

• Expose ExprGroup data structure even when features="full" is not used (#1412)

2.0.2

... (truncated)

Commits

• 4cae0a2 Release 2.0.18
• 278dbe1 Merge pull request #1461 from dtolnay/emptyattr
• f1ff0e9 Permit empty attr in syn::meta::parser
• c59a68d Release 2.0.17
• c49115a Eliminate pm rename for proc_macro crate
• ab19415 Merge pull request #1459 from dtolnay/wasm
• ee29399 Extern crate proc_macro available on all wasm targets
• 4e97063 Show error details during miri setup in CI
• 9aa5c63 Release 2.0.16
• efda52a Merge pull request #1454 from dtolnay/builtin
• Additional commits viewable in compare view

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