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Revert a hack that only ever worked on level deep

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This commit is contained in:
Oli Scherer
2022-06-28 08:00:25 +00:00
parent 6b33d5bfa9
commit ea68ce7fac
1 changed files with 1 additions and 5 deletions
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compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
+1 -5
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@@ -967,11 +967,7 @@ pub(crate) fn compute_match_usefulness<'p, 'tcx>(
})
.collect();
// In case we're matching on an opaque type in its defining scope, the patterns define the hidden type.
// The wildcard pattern needs to have the same type, otherwise it will always be deemed useful, even if the
// match is exhaustive for the pattern type.
let wild_ty = arms.first().map_or(scrut_ty, |arm| arm.pat.ty());
let wild_pattern = cx.pattern_arena.alloc(DeconstructedPat::wildcard(wild_ty));
let wild_pattern = cx.pattern_arena.alloc(DeconstructedPat::wildcard(scrut_ty));
let v = PatStack::from_pattern(wild_pattern);
let usefulness = is_useful(cx, &matrix, &v, FakeExtraWildcard, scrut_hir_id, false, true);
let non_exhaustiveness_witnesses = match usefulness {