src/test/ui/type-alias-impl-trait/generic_duplicate_param_use3.rs

   1 // revisions: min_tait full_tait
   2 #![feature(min_type_alias_impl_trait)]
   3 #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
   4 //[full_tait]~^ WARN incomplete
   5
   6 use std::fmt::Debug;
   7
   8 fn main() {}
   9
  10 // test that unused generic parameters are ok
  11 type Two<T, U> = impl Debug;
  12
  13 fn one<T: Debug>(t: T) -> Two<T, T> {
  14     //~^ ERROR non-defining opaque type use in defining scope
  15     t
  16 }
  17
  18 fn two<T: Debug, U>(t: T, _: U) -> Two<T, U> {
  19     t
  20 }
  21
  22 fn three<T, U: Debug>(_: T, u: U) -> Two<T, U> {
  23     u
  24 }