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also normalize_erasing_regions

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Ralf Jung 2020-06-01 21:04:11 +02:00
parent 93e3552d04
commit 9576e307a7
1 changed files with 7 additions and 0 deletions
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7
src/librustc_mir/transform/validate.rs
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@ -89,6 +89,13 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
// Equal types, all is good.
return true;
}
// Normalize projections and things like that.
let src = self.tcx.normalize_erasing_regions(self.param_env, src);
let dest = self.tcx.normalize_erasing_regions(self.param_env, dest);
// It's worth checking equality again.
if src == dest {
return true;
}
// Type-changing assignments can happen for (at least) two reasons:
// 1. `&mut T` -> `&T` gets optimized from a reborrow to a mere assignment.