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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() {}
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