Add Clone impls for NestedList and NestedDict

Now requires the syn/clone-impls feature (which is on by default).

Added

• Add Clone impl to parse::Braced wrapper (llwxntnt)
• Derive Clone impls for NestedList and NestedDict (nsysprpp)

Changed

• Require syn/clone-impls feature, needed for Clone impls for NestedList (among others) (qozqwmmk)
  • This is turned on in the default syn features, so shouldn't add any compile time in the common case.

Add Braced parse wrapper

Added

• Add Braced wrapper, which parses an item surrounded by braces { } (mpnuopmt)

Fix span of missing argument errors in nested structs.

With the assistance of Claude Code, this release includes many other fixes and cleanups.

Added

• Implement Debug for NestedDict (kwsztwtm)
• Implement Default for NestedDict, allowing use with #[kwarg(optional)] (xlmlvnwn)

Changed

• Declare minimum supported rust version of 1.71 (mrvqwsux)
  • This is the oldest version that syn v3 supports.
• Relicense from MIT to MIT OR Apache-2.0 (kxrrqpts)
  • Since the MIT license is still an option, this change actually makes licensing more permissive.
• Require the exact matching version of macro-kwargs-derive (ultltztn)
  • Generated code relies on internal APIs, so mismatched versions could fail to compile.
• Reject integer and float literals whose suffix doesn't match the target type (sovtoywz)
  • For example, 5i64 can no longer be parsed as a u8. Unsuffixed literals are unaffected.
  • This is technically a breaking change, but any code that relied on the prior behavior was buggy.

Fixed

• Fix span of missing argument errors in nested structs (pnrqmzup)
• Avoid redundant_field_names lint in generated code (nvqqkunl)
• Fix #[kwarg(with_func = "...")], which previously failed to compile as the function wasn't properly called (movmzuok)
• Generated code no longer requires a direct dependency on syn or proc-macro2 (vlkusror)
• Fix parse_macro_arg_via_syn! when invoked by path or without syn in scope (ossnuvpr)
• Point ExplicitOption parse errors at the unexpected identifier instead of the token after it (sxzzzyzv)
• Allow fields named argument_list or missing_argument_errors, which clashed with locals in generated code (vrtqvqnq)
• Reject fields with duplicate argument names (via rename), which previously made one of them impossible to set (owonzqoy)
• Fields with raw names like r#type now take the argument type instead of r#type; both spellings are accepted (zunuotso)
• NestedDict reports every duplicate key, instead of stopping at the first one (xuuxssvv)
• Correct the docs for ParsedKeywordArguments ordering: arguments are in the order the user wrote them, not the order the fields are declared in (rwmympok)
  • This was already the actual behavior; only the documentation was wrong.
• Allow a trailing comma in #[kwarg(...)], like #[kwarg(optional,)] (xwwsquxv)
• Fix derive failing on fields whose names differ only in case or underscores, like foo_bar and foo__bar (loplrtmk)
  • Avoid non_snake_case warnings in generated code for fields that aren't snake case.
• Reject generic structs in the derive with a clear error, instead of failing with confusing errors in generated code (klptmunk)

Rename crate to macro-kwargs

Changes

• BIG: Rename crate from proc-macro-kwargs to macro-kwargs. (ltmmqrrp)
  • Crate with old name has been marked #[deprecated(...)] in v0.3.1 and will receive no further updates.
  • This crate's versions start off where proc-macro-kwargs ended.

NOTE: The crate has no v0.3.2 version, neither under the old crate name nor the new one.

I originally meant to publish change rmnzyzlo (commit 4b51166) as v0.3.2,
but I accidentally published it as v0.3.3 on crates.io and messed up the CHANGELOG.
Since crates.io releases are immutable, I stuck with v0.3.3 as the version number for the release.

Warn about impending rename to `macro-kwargs`.

Changes

• WARNING: Impending rename from proc-macro-kwargs to macro-kwargs.

The crate has been marked deprecated in favor of its new name.
The crate under the old name will receive no further updates.

Update to syn v3

Changes

• BREAKING: Update to syn v3 (nzzxxmyz)

Add a #[kwarg(with_syn)] attribute

Added

• Support a #[kwarg(with_syn)] shorthand to parse via syn::Parse instead of MacroArg (smwonvvz)
  • More concise than using the proc_macro_kwargs::parse::Syn wrapper type (which doesn't even support #[kwarg(with_wrapper)])
  • Also available through the #[kwarg(syn)] shorthand

Support stable rust

Removes use of #[feature(trait_alias)],
allowing program to compile on stable rust in addition to nightly.

Upgrade heck from 0.4 to 0.5.

Upgrade to syn v2

Requires minor version bump for semver compatibility.

This is an alpha version because it removes impl MacroArg for NestedMeta,
At the time, I didn't know what the syn v2 replacement for NestedMeta is.

Fix "useless question mark" warning in derived code

Add #[automatically_derived] to the generated trait impls.

Implement From<T> for Syn<T>.
Cannot add From<Syn<T>> for T due to coherence rules.