tests/ui/type-alias-impl-trait/generic_duplicate_param_use4.rs


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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 three<T, U: Debug>(_: T, u: U) -> Two<T, U> {
    u
    //~^ ERROR `U` doesn't implement `Debug`
}