Bump syn from 1.0.103 to 2.0.20

[dependabot[bot]]

Bumps syn from 1.0.103 to 2.0.20.

Release notes

Sourced from syn's releases.

2.0.20

• Documentation improvements

2.0.19

• Improve rendering of compile errors within 2015-edition code calling a 2018+ edition proc macro (#1467, thanks @​danielhenrymantilla)

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

... (truncated)

Commits

• 0d55124 Release 2.0.20
• d422546 Merge pull request 1469 from billy1624/point-to-latest-docs
• db3381a Release syn-codegen 0.4.0
• 7fa4584 Move syn-codegen crate to own workspace
• 85d41e1 Update indexmap dependency to version 2
• f052630 Update docs.rs links to latest syn
• 8e94e99 Update test suite to nightly-2023-06-23
• 782fd24 Parse crate root in nested use-trees
• ed8dcbd Categorize new parse failures
• 31035aa Update test suite to nightly-2023-06-20
• Additional commits viewable in compare view

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