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[rust.git] / tests / ui / type-alias-impl-trait / generic_duplicate_param_use3.rs
1 #![feature(type_alias_impl_trait)]
2
3 use std::fmt::Debug;
4
5 fn main() {}
6
7 // test that unused generic parameters are ok
8 type Two<T, U> = impl Debug;
9
10 fn two<T: Debug, U>(t: T, _: U) -> Two<T, U> {
11     t
12     //~^ ERROR `T` doesn't implement `Debug`
13 }
14
15 fn three<T, U: Debug>(_: T, u: U) -> Two<T, U> {
16     u
17     //~^ ERROR `U` doesn't implement `Debug`
18 }