tests/ui/impl-trait/issue-55872.rs


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#![feature(impl_trait_in_assoc_type)]

pub trait Bar {
    type E: Copy;

    fn foo<T>() -> Self::E;
}

impl<S> Bar for S {
    type E = impl Copy;

    fn foo<T>() -> Self::E {
        || ()
        //~^ ERROR type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
    }
}

fn main() {}