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4173: Use core instead of std for builtin derive macros r=edwin0cheng a=edwin0cheng Fixed #4087. We can't use `$crate` here right now because : 1. We have to able to detect `macro` 2.0 in collecting phase for finding `rustc_builtin_macro` attrs. 2. And we have to make hygiene works for builtin derive macro. r= @flodiebold Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com> |
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