File: in-assoc-type.rs

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rustc 1.85.0%2Bdfsg2-3
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//! This test checks that we don't allow registering hidden types for
//! opaque types from other impls.

#![feature(impl_trait_in_assoc_type)]

trait Foo<T> {
    type Bar;
    fn foo(&self) -> <Self as Foo<()>>::Bar
    where
        Self: Foo<()>;
}

impl Foo<()> for () {
    type Bar = impl std::fmt::Debug;
    fn foo(&self) -> Self::Bar {}
}

impl Foo<i32> for () {
    type Bar = u32;
    fn foo(&self) -> <Self as Foo<()>>::Bar {}
    //~^ ERROR: mismatched types
}

fn main() {}