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

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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.
This commit is contained in:
Tomasz Miąsko 2021-02-15 00:00:00 +00:00
parent d1206f950f
commit 64b5b75e65
1 changed files with 1 additions and 1 deletions
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compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
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@ -289,7 +289,6 @@ use super::{PatternFoldable, PatternFolder};
use rustc_data_structures::captures::Captures;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::sync::OnceCell;
use rustc_arena::TypedArena;
use rustc_hir::def_id::DefId;
@ -300,6 +299,7 @@ use rustc_span::Span;
use smallvec::{smallvec, SmallVec};
use std::fmt;
use std::iter::{FromIterator, IntoIterator};
use std::lazy::OnceCell;
crate struct MatchCheckCtxt<'a, 'tcx> {
crate tcx: TyCtxt<'tcx>,