Yuki Okushi 8b9e138ecd
Rollup merge of #86491 - petrochenkov:derefact, r=Aaron1011
expand: Move some more derive logic to rustc_builtin_macros

And cleanup some `unwrap`s in `cfg_eval`.

Refactorings extracted from https://github.com/rust-lang/rust/pull/83354 and https://github.com/rust-lang/rust/pull/86057.
r? ``@Aaron1011``
2021-06-21 09:42:19 +09:00
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2021-02-18 13:07:49 +03:00
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