bjoernager/rust
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Add AliasKind::Weak for type aliases.

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Only use it when the type alias contains an opaque type.

Also does wf-checking on such type aliases.
This commit is contained in:
Oli Scherer 2023-03-07 12:03:11 +00:00
parent 4fdd07fe88
commit f3b7dd6388
86 changed files with 474 additions and 199 deletions
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3
compiler/rustc_trait_selection/src/traits/query/normalize.rs
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@ -257,7 +257,7 @@ impl<'cx, 'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for QueryNormalizer<'cx, 'tcx>
ty::Opaque => ty.try_super_fold_with(self)?,
ty::Projection | ty::Inherent => {
ty::Projection | ty::Inherent | ty::Weak => {
// See note in `rustc_trait_selection::traits::project`
let infcx = self.infcx;
@ -282,6 +282,7 @@ impl<'cx, 'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for QueryNormalizer<'cx, 'tcx>
debug!("QueryNormalizer: orig_values = {:#?}", orig_values);
let result = match kind {
ty::Projection => tcx.normalize_projection_ty(c_data),
ty::Weak => tcx.normalize_weak_ty(c_data),
ty::Inherent => tcx.normalize_inherent_projection_ty(c_data),
_ => unreachable!(),
}?;