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Auto merge of #89000 - Mark-Simulacrum:no-new-lrc, r=petrochenkov

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Reuse existing shared Lrc for MatchImpl parent

This is a small performance win for the hot path, which helps to address this regression: https://github.com/rust-lang/rust/pull/87244#issuecomment-883635813.
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bors 2021-09-18 20:13:21 +00:00
commit aa8f2d432b
4 changed files with 4 additions and 4 deletions
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2
compiler/rustc_middle/src/traits/mod.rs
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@ -349,7 +349,7 @@ pub enum ObligationCauseCode<'tcx> {
WellFormed(Option<WellFormedLoc>),
/// From `match_impl`. The cause for us having to match an impl, and the DefId we are matching against.
MatchImpl(Lrc<ObligationCauseCode<'tcx>>, DefId),
MatchImpl(ObligationCause<'tcx>, DefId),
}
/// The 'location' at which we try to perform HIR-based wf checking.