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Account for self ty alias

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This commit is contained in:
Michael Goulet 2024-07-17 16:36:21 -04:00
parent 3716a3fd31
commit a0a251a688
6 changed files with 34 additions and 15 deletions
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2
compiler/rustc_hir_analysis/messages.ftl
View File

@ -384,7 +384,7 @@ hir_analysis_precise_capture_self_alias = `Self` can't be captured in `use<...>`
hir_analysis_recursive_generic_parameter = {$param_def_kind} `{$param_name}` is only used recursively
.label = {$param_def_kind} must be used non-recursively in the definition
.note = all type parameters must be used in a non-recursive way in order to constrain its variance
.note = all type parameters must be used in a non-recursive way in order to constrain their variance
hir_analysis_redundant_lifetime_args = unnecessary lifetime parameter `{$victim}`
.note = you can use the `{$candidate}` lifetime directly, in place of `{$victim}`

15
compiler/rustc_hir_analysis/src/check/wfcheck.rs
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@ -1961,11 +1961,16 @@ impl<'tcx> Visitor<'tcx> for CollectUsageSpans<'_> {
}
fn visit_ty(&mut self, t: &'tcx hir::Ty<'tcx>) -> Self::Result {
if let hir::TyKind::Path(hir::QPath::Resolved(None, qpath)) = t.kind
&& let Res::Def(DefKind::TyParam, def_id) = qpath.res
&& def_id == self.param_def_id
{
self.spans.push(t.span);
if let hir::TyKind::Path(hir::QPath::Resolved(None, qpath)) = t.kind {
if let Res::Def(DefKind::TyParam, def_id) = qpath.res
&& def_id == self.param_def_id
{
self.spans.push(t.span);
return;
} else if let Res::SelfTyAlias { .. } = qpath.res {
self.spans.push(t.span);
return;
}
}
intravisit::walk_ty(self, t);
}

4
tests/ui/lazy-type-alias/inherent-impls-overflow.next.stderr
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@ -13,7 +13,7 @@ LL | type Poly0<T> = Poly1<(T,)>;
| type parameter must be used non-recursively in the definition
|
= help: consider removing `T` or referring to it in the body of the type alias
= note: all type parameters must be used in a non-recursive way in order to constrain its variance
= note: all type parameters must be used in a non-recursive way in order to constrain their variance
error: type parameter `T` is only used recursively
--> $DIR/inherent-impls-overflow.rs:17:24
@ -24,7 +24,7 @@ LL | type Poly1<T> = Poly0<(T,)>;
| type parameter must be used non-recursively in the definition
|
= help: consider removing `T` or referring to it in the body of the type alias
= note: all type parameters must be used in a non-recursive way in order to constrain its variance
= note: all type parameters must be used in a non-recursive way in order to constrain their variance
error[E0275]: overflow evaluating the requirement `Poly0<()> == _`
--> $DIR/inherent-impls-overflow.rs:21:6

4
tests/ui/traits/issue-105231.stderr
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@ -24,7 +24,7 @@ LL | struct A<T>(B<T>);
| type parameter must be used non-recursively in the definition
|
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
= note: all type parameters must be used in a non-recursive way in order to constrain its variance
= note: all type parameters must be used in a non-recursive way in order to constrain their variance
error: type parameter `T` is only used recursively
--> $DIR/issue-105231.rs:5:17
@ -35,7 +35,7 @@ LL | struct B<T>(A<A<T>>);
| type parameter must be used non-recursively in the definition
|
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
= note: all type parameters must be used in a non-recursive way in order to constrain its variance
= note: all type parameters must be used in a non-recursive way in order to constrain their variance
error[E0275]: overflow evaluating the requirement `A<A<A<A<A<A<A<...>>>>>>>: Send`
|

3
tests/ui/variance/variance-unused-type-param.rs
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@ -16,6 +16,9 @@ enum ListCell<T> {
Nil
}
struct SelfTyAlias<T>(Box<Self>);
//~^ ERROR parameter `T` is only used recursively
struct WithBounds<T: Sized> {}
//~^ ERROR parameter `T` is never used

21
tests/ui/variance/variance-unused-type-param.stderr
View File

@ -25,10 +25,21 @@ LL | Cons(Box<ListCell<T>>),
| ^
|
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
= note: all type parameters must be used in a non-recursive way in order to constrain its variance
= note: all type parameters must be used in a non-recursive way in order to constrain their variance
error: type parameter `T` is only used recursively
--> $DIR/variance-unused-type-param.rs:19:27
|
LL | struct SelfTyAlias<T>(Box<Self>);
| - ^^^^
| |
| type parameter must be used non-recursively in the definition
|
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
= note: all type parameters must be used in a non-recursive way in order to constrain their variance
error[E0392]: type parameter `T` is never used
--> $DIR/variance-unused-type-param.rs:19:19
--> $DIR/variance-unused-type-param.rs:22:19
|
LL | struct WithBounds<T: Sized> {}
| ^ unused type parameter
@ -36,7 +47,7 @@ LL | struct WithBounds<T: Sized> {}
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
error[E0392]: type parameter `T` is never used
--> $DIR/variance-unused-type-param.rs:22:24
--> $DIR/variance-unused-type-param.rs:25:24
|
LL | struct WithWhereBounds<T> where T: Sized {}
| ^ unused type parameter
@ -44,13 +55,13 @@ LL | struct WithWhereBounds<T> where T: Sized {}
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
error[E0392]: type parameter `T` is never used
--> $DIR/variance-unused-type-param.rs:25:27
--> $DIR/variance-unused-type-param.rs:28:27
|
LL | struct WithOutlivesBounds<T: 'static> {}
| ^ unused type parameter
|
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
error: aborting due to 6 previous errors
error: aborting due to 7 previous errors
For more information about this error, try `rustc --explain E0392`.