chore(deps): Update proc macro dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
darling	dependencies	patch	0.20.3 -> 0.20.9
proc-macro2	dependencies	patch	1.0.69 -> 1.0.85
quote	dependencies	patch	1.0.33 -> 1.0.36
syn	dependencies	patch	2.0.39 -> 2.0.66

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Release Notes

TedDriggs/darling (darling)

v0.20.9

• Allow word-form for newtype enum variants whose only field produces a value when from_none is called on their type #​249
• Add FromMeta impls for the std::num::NonZero* types #​288
• Fix panic in number FromMeta impls when the parsed value is too large for the receiver type #​289

v0.20.8

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• Add #[darling(with = ...)] support to attrs magic field to allow using custom receiver types for attrs #​273

v0.20.7

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• Add #[darling(flatten)] to allow forwarding unknown fields to another struct #​146
• Don't suggest names of skipped fields in derived impls #​268

v0.20.6

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• Fix some missing syn invisible group handling in FromMeta impls #​263
• Fix misleading error message on Error::unexpected_type so it no longer implies the type was a literal #​264
• Impl FromMeta Vec of literals, e.g. LitStr #​265

v0.20.5

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• Add Flag::span inherent method, as Flag can no longer impl syn::spanned::Spanned #​242

v0.20.4

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• Accept bare paths in #[darling(default = ...)] #​258
• Add FromMeta impl for PathBuf #​259
• Improve FromMeta implementation for enums #​260
  • Properly implement unit arms in FromMeta::from_list to provide a consistent API for heterogeneous enums that include a mix of unit, newtype and struct variants
  • Add #[darling(word)] attribute for unit enum variants (See #​63 for details)

dtolnay/proc-macro2 (proc-macro2)

v1.0.85

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• Mark some tests as only for 64-bit targets (#​463)

v1.0.84

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• Documentation improvements (#​455, thanks @​CensoredUsername)

v1.0.83

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• Optimize the representation of Ident (#​462)

v1.0.82

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• Resolve unexpected_cfgs warning (#​456)

v1.0.81

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• Documentation improvements

v1.0.80

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• Add Literal::byte_character constructor (#​449)
• Add Literal::c_string constructor #​450)

v1.0.79

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• Clean up dead code

v1.0.78

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• Expose Span::byte_range (#​442)

v1.0.77

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• Add a function to reset thread-local span data (#​438, thanks @​buchgr)

v1.0.76

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• Work around dead_code warning false positive (#​435)

v1.0.75

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• Improve error messages related to proc_macro::LexError (#​434)

v1.0.74

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• Work around improperly cached build script result by sccache (#​432)

v1.0.73

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• Documentation improvements

v1.0.72

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• Improve build script to be robust to proc_macro::Span unstable API changes

v1.0.71

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• Turn on deny(unsafe_op_in_unsafe_fn) lint

v1.0.70

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• Add #[track_caller] on Ident::new so that panics on invalid input are attributed to the caller (#​423)

dtolnay/quote (quote)

v1.0.36

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• Documentation improvements

v1.0.35

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• Update proc-macro2 to fix caching issue when using a rustc-wrapper such as sccache

v1.0.34

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• Documentation improvements

dtolnay/syn (syn)

v2.0.66

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• Allow braced structs when parsing ExprLet (#​1671)

v2.0.65

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

v2.0.64

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• 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)

v2.0.63

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

v2.0.62

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

v2.0.61

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

v2.0.60

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

v2.0.59

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

v2.0.58

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• Support $ in custom_punctuation! macro (#​1611)

v2.0.57

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

v2.0.56

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

v2.0.55

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

v2.0.54

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

v2.0.53

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

v2.0.52

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• Add an expression parser that uses match-arm's boundary rules (#​1593)

v2.0.51

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• Resolve non_local_definitions warnings in generated code under rustc 1.78-nightly

v2.0.50

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• Fix unused_imports warnings when compiled by rustc 1.78

v2.0.49

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• Improve error location when parsing from an empty string literal using LitStr::parse (#​1590)

v2.0.48

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• Improve error message on unexpected token after else (#​1578)

v2.0.47

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• Improve error messages related to proc_macro::LexError (#​1575)

v2.0.46

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• Update proc-macro2 to fix caching issue when using a rustc-wrapper such as sccache

v2.0.45

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• Parse unsupported expressions in enum discriminants of DeriveInput as Expr::Verbatim in non-"full" mode, instead of error (#​1513)
• Support parsing PatType with parse_quote! (#​1573)

v2.0.44

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• Documentation improvements

v2.0.43

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• Insert trailing comma if not already present when printing a 1-tuple in pattern position (#​1553)

v2.0.42

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• Documentation improvements

v2.0.41

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• Support parsing syn::Field in parse_quote! (#​1548)

v2.0.40

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• Fix some edge cases of handling None-delimited groups in expression parser (#​1539, #​1541, #​1542, #​1543, #​1544, #​1545)

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