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#![feature(type_alias_impl_trait)]
use std::fmt::Debug;
fn main() {}
// test that unused generic parameters are ok
type Two<T, U> = impl Debug;
fn two<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
(t, u)
//~^ ERROR `T` doesn't implement `Debug`
//~| ERROR `U` doesn't implement `Debug`
}
fn three<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
(u, t)
//~^ ERROR `T` doesn't implement `Debug`
//~| ERROR `U` doesn't implement `Debug`
}
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