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Use !Sync std::lazy::OnceCell in usefulness checking #82155

Merged
merged 1 commit into from
Feb 18, 2021
Merged

Use !Sync std::lazy::OnceCell in usefulness checking #82155

merged 1 commit into from
Feb 18, 2021

Commits on Feb 15, 2021

  1. Use !Sync std::lazy::OnceCell in usefulness checking 

    The `rustc_data_structures::sync::OnceCell` is thread-safe when building
a parallel compiler. This is unnecessary for the purposes of pattern
usefulness checking. Use `!Sync` `std::lazy::OnceCell` instead.
    @tmiasko
    tmiasko committed Feb 15, 2021
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