diff options
Diffstat (limited to 'tests')
3 files changed, 41 insertions, 4 deletions
diff --git a/tests/ui/type-alias-impl-trait/associated-type-impl-trait-lifetime.rs b/tests/ui/type-alias-impl-trait/associated-type-impl-trait-lifetime.rs index 551815d021a..21c1d8bcc98 100644 --- a/tests/ui/type-alias-impl-trait/associated-type-impl-trait-lifetime.rs +++ b/tests/ui/type-alias-impl-trait/associated-type-impl-trait-lifetime.rs @@ -5,15 +5,14 @@ trait Trait { type Opaque1; type Opaque2; - fn constrain(self); + fn constrain(self) -> (Self::Opaque1, Self::Opaque2); } impl<'a> Trait for &'a () { type Opaque1 = impl Sized; type Opaque2 = impl Sized + 'a; - fn constrain(self) { - let _: Self::Opaque1 = (); - let _: Self::Opaque2 = self; + fn constrain(self) -> (Self::Opaque1, Self::Opaque2) { + ((), self) } } diff --git a/tests/ui/type-alias-impl-trait/invalid_impl_trait_in_assoc_ty.rs b/tests/ui/type-alias-impl-trait/invalid_impl_trait_in_assoc_ty.rs new file mode 100644 index 00000000000..93c52126d69 --- /dev/null +++ b/tests/ui/type-alias-impl-trait/invalid_impl_trait_in_assoc_ty.rs @@ -0,0 +1,16 @@ +#![feature(impl_trait_in_assoc_type)] + +trait Foo { + type Foo; + fn bar(); +} + +impl Foo for () { + type Foo = impl std::fmt::Debug; + fn bar() { + let x: Self::Foo = (); + //~^ ERROR: mismatched types + } +} + +fn main() {} diff --git a/tests/ui/type-alias-impl-trait/invalid_impl_trait_in_assoc_ty.stderr b/tests/ui/type-alias-impl-trait/invalid_impl_trait_in_assoc_ty.stderr new file mode 100644 index 00000000000..2beed73cb85 --- /dev/null +++ b/tests/ui/type-alias-impl-trait/invalid_impl_trait_in_assoc_ty.stderr @@ -0,0 +1,22 @@ +error[E0308]: mismatched types + --> $DIR/invalid_impl_trait_in_assoc_ty.rs:11:28 + | +LL | type Foo = impl std::fmt::Debug; + | -------------------- the expected opaque type +LL | fn bar() { +LL | let x: Self::Foo = (); + | --------- ^^ expected opaque type, found `()` + | | + | expected due to this + | + = note: expected opaque type `<() as Foo>::Foo` + found unit type `()` +note: this item must have the opaque type in its signature in order to be able to register hidden types + --> $DIR/invalid_impl_trait_in_assoc_ty.rs:10:5 + | +LL | fn bar() { + | ^^^^^^^^ + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0308`. |