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2025-08-14mbe: Handle applying `macro_rules` derivesJosh Triplett-0/+51
Add infrastructure to apply a derive macro to arguments, consuming and returning a `TokenTree` only. Handle `SyntaxExtensionKind::MacroRules` when expanding a derive, if the macro's kinds support derive. Add tests covering various cases of `macro_rules` derives. Note that due to a pre-existing FIXME in `expand.rs`, derives are re-queued and some errors get emitted twice. Duplicate diagnostic suppression makes them not visible, but the FIXME should still get fixed.
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2025-10-31 23:34:59 +0000