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Merge the orphan logic for all alias kinds

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This commit is contained in:
Oli Scherer 2023-03-13 13:33:39 +00:00
parent 2304917aad
commit 4fdd07fe88
1 changed files with 23 additions and 29 deletions
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52
compiler/rustc_hir_analysis/src/coherence/orphan.rs
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@ -200,35 +200,29 @@ fn do_orphan_check_impl<'tcx>(
NonlocalImpl::DisallowOther,
),
// trait Id { type This: ?Sized; }
// impl<T: ?Sized> Id for T {
// type This = T;
// }
// impl<T: ?Sized> AutoTrait for <T as Id>::This {}
ty::Alias(AliasKind::Projection, _) => (
LocalImpl::Disallow { problematic_kind: "associated type" },
NonlocalImpl::DisallowOther,
),
// ```
// struct S<T>(T);
// impl<T: ?Sized> S<T> {
// type This = T;
// }
// impl<T: ?Sized> AutoTrait for S<T>::This {}
// ```
// FIXME(inherent_associated_types): The example code above currently leads to a cycle
ty::Alias(AliasKind::Inherent, _) => (
LocalImpl::Disallow { problematic_kind: "associated type" },
NonlocalImpl::DisallowOther,
),
// type Opaque = impl Trait;
// impl AutoTrait for Opaque {}
ty::Alias(AliasKind::Opaque, _) => (
LocalImpl::Disallow { problematic_kind: "opaque type" },
NonlocalImpl::DisallowOther,
),
ty::Alias(kind, _) => {
let problematic_kind = match kind {
// trait Id { type This: ?Sized; }
// impl<T: ?Sized> Id for T {
// type This = T;
// }
// impl<T: ?Sized> AutoTrait for <T as Id>::This {}
AliasKind::Projection => "associated type",
// type Opaque = impl Trait;
// impl AutoTrait for Opaque {}
AliasKind::Opaque => "opaque type",
// ```
// struct S<T>(T);
// impl<T: ?Sized> S<T> {
// type This = T;
// }
// impl<T: ?Sized> AutoTrait for S<T>::This {}
// ```
// FIXME(inherent_associated_types): The example code above currently leads to a cycle
AliasKind::Inherent => "associated type",
};
(LocalImpl::Disallow { problematic_kind }, NonlocalImpl::DisallowOther)
}
ty::Bool
| ty::Char