bors[bot] da1f316b02
Merge #4173
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>
2020-04-27 20:12:27 +00:00
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