Bump syn from 1.0.109 to 2.0.27

[dependabot]

Bumps syn from 1.0.109 to 2.0.27.

Release notes

Sourced from syn's releases.

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)

2.0.23

• Preserve attributes on verbatim Item in statement position (#1476)
• Support generic_const_exprs where-clauses such as where [(); { T::COUNT }]: in non-"full" mode (#1478)

2.0.22

• Parse c"…" c-string literals (tracking issue: rust-lang/rust#105723)

2.0.21

• Fix value computed by LitByteStr::value in the case of a cooked byte string literal containing form feed or vertical tab characters following an escaped newline (#1474)

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)

... (truncated)

Commits

• bb23493 Release 2.0.27
• e3a15a9 Opt in to generate-link-to-definition when building on docs.rs
• 36a743a Merge pull request #1490 from dtolnay/docinline
• 535246e Fix useless re-exports section appearing in documentation at crate root
• 3b42902 Merge pull request #1489 from GuillaumeGomez/unneeded-cfg
• 16da0b2 Update test suite to nightly-2023-07-21
• 268a017 Remove unneeded cfg
• 82c969e Ignore needless_pass_by_ref_mut clippy lint in generated traits
• 517f0e9 Merge pull request #1487 from dtolnay/clonefrom
• 2cb7f28 Preserve existing allocations when cloning Punctuated
• Additional commits viewable in compare view

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[sjackman]

@dependabot rebase

[sjackman]

error[E0599]: no method named `parse_meta` found for reference `&Attribute` in the current scope
error[E0609]: no field `lit` on type `&MetaNameValue`

https://github.com/martian-lang/martian-rust/actions/runs/6780632801/job/18429584912?pr=389#step:7:78
Requires an update for the new syn 2 API.

[sjackman]

@dependabot rebase

[dependabot]

Looks like syn is up-to-date now, so this is no longer needed.