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

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Feb 18, 2021
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Use !Sync std::lazy::OnceCell in usefulness checking #82155

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2 changes: 1 addition & 1 deletion compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand All @@ -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>,
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