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#![feature(impl_trait_in_assoc_type)]
use std::fmt::Debug;
pub trait Foo {
type Item: Debug;
fn foo<T: Debug>(_: T) -> Self::Item;
}
#[derive(Debug)]
pub struct S<T>(std::marker::PhantomData<T>);
pub struct S2;
impl Foo for S2 {
type Item = impl Debug;
fn foo<T: Debug>(_: T) -> Self::Item {
S::<T>(Default::default())
//~^ Error type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
}
}
fn main() {
S2::foo(123);
}
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