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#![feature(impl_trait_in_assoc_type)]
trait Foo<T> {
type Assoc;
fn test() -> u32;
}
struct DefinesOpaque;
impl Foo<DefinesOpaque> for () {
type Assoc = impl Sized;
// This test's return type is `u32`, *not* the opaque that is defined above.
// Previously we were only checking that the self type of the assoc matched,
// but this doesn't account for other impls with different trait substs.
fn test() -> <() as Foo<NoOpaques>>::Assoc {
let _: <Self as Foo<DefinesOpaque>>::Assoc = "";
//~^ ERROR mismatched types
1
}
}
struct NoOpaques;
impl Foo<NoOpaques> for () {
type Assoc = u32;
fn test() -> u32 {
1
}
}
fn main() {}
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