src/test/ui/type-alias-impl-trait/generic_duplicate_param_use6.rs

#![feature(type_alias_impl_trait)]

use std::fmt::Debug;

fn main() {}

// test that unused generic parameters are ok
type Two<T, U> = impl Debug;
//~^ ERROR `T` doesn't implement `Debug`

fn two<T: Copy + Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
    (t, t)
}

fn three<T: Copy + Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
    //~^ ERROR concrete type differs from previous
    (u, t)
}