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Continue folding in query normalizer on weak aliases

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This commit is contained in:
Michael Goulet
2023-06-18 20:56:30 +00:00
parent 939786223f
commit 493b18b653
2 changed files with 18 additions and 2 deletions
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8
compiler/rustc_trait_selection/src/traits/query/normalize.rs
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@@ -322,8 +322,12 @@ impl<'cx, 'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for QueryNormalizer<'cx, 'tcx>
};
// `tcx.normalize_projection_ty` may normalize to a type that still has
// unevaluated consts, so keep normalizing here if that's the case.
if res != ty && res.has_type_flags(ty::TypeFlags::HAS_CT_PROJECTION) {
res.try_super_fold_with(self)?
// Similarly, `tcx.normalize_weak_ty` will only unwrap one layer of type
// and we need to continue folding it to reveal the TAIT behind it.
if res != ty
&& (res.has_type_flags(ty::TypeFlags::HAS_CT_PROJECTION) || kind == ty::Weak)
{
res.try_fold_with(self)?
} else {
res
}