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Handle weak type aliases by immediately resolving them to their aliased type

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This commit is contained in:
Oli Scherer 2023-06-19 12:42:59 +00:00
parent b0b4a07959
commit b323f587fc
3 changed files with 14 additions and 19 deletions
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23
compiler/rustc_ty_utils/src/opaque_types.rs
View file

@ -107,6 +107,12 @@ fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<!> {
}
}
}
ty::Alias(ty::Weak, alias_ty) if alias_ty.def_id.is_local() => {
self.tcx
.type_of(alias_ty.def_id)
.subst(self.tcx, alias_ty.substs)
.visit_with(self)?;
}
ty::Alias(ty::Projection, alias_ty) => {
// This avoids having to do normalization of `Self::AssocTy` by only
// supporting the case of a method defining opaque types from assoc types
@ -136,24 +142,23 @@ fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<!> {
ty::InternalSubsts::identity_for_item(self.tcx, parent),
);
if !check_substs_compatible(self.tcx, assoc, impl_substs) {
if check_substs_compatible(self.tcx, assoc, impl_substs) {
return self
.tcx
.type_of(assoc.def_id)
.subst(self.tcx, impl_substs)
.visit_with(self);
} else {
self.tcx.sess.delay_span_bug(
self.tcx.def_span(assoc.def_id),
"item had incorrect substs",
);
return ControlFlow::Continue(());
}
return self
.tcx
.type_of(assoc.def_id)
.subst(self.tcx, impl_substs)
.visit_with(self);
}
}
}
}
_ => {}
_ => trace!(kind=?t.kind()),
}
ControlFlow::Continue(())
}

5
tests/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.stderr
View file

@ -20,11 +20,6 @@ LL | fn eq(&self, _other: &(Foo, i32)) -> bool {
|
= note: expected signature `fn(&a::Bar, &(a::Bar, i32)) -> _`
found signature `fn(&a::Bar, &(a::Foo, i32)) -> _`
note: this item must have the opaque type in its signature in order to be able to register hidden types
--> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:10:12
|
LL | fn eq(&self, _other: &(Foo, i32)) -> bool {
| ^^
error: unconstrained opaque type
--> $DIR/recursive-type-alias-impl-trait-declaration-too-subtle.rs:18:16

5
tests/ui/type-alias-impl-trait/unnameable_type.stderr
View file

@ -25,11 +25,6 @@ LL | fn dont_define_this(_private: Private) {}
| ^^^^^^^
= note: expected signature `fn(Private)`
found signature `fn(MyPrivate)`
note: this item must have the opaque type in its signature in order to be able to register hidden types
--> $DIR/unnameable_type.rs:20:8
|
LL | fn dont_define_this(_private: MyPrivate) {}
| ^^^^^^^^^^^^^^^^
error: aborting due to 2 previous errors