src/test/ui/generic-associated-types/issue-90014.rs

   1 // edition:2018
   2
   3 #![feature(type_alias_impl_trait)]
   4
   5 use std::future::Future;
   6
   7 trait MakeFut {
   8     type Fut<'a> where Self: 'a;
   9     fn make_fut<'a>(&'a self) -> Self::Fut<'a>;
  10 }
  11
  12 impl MakeFut for &'_ mut () {
  13     type Fut<'a> = impl Future<Output = ()>;
  14     //~^ ERROR: the type `&mut ()` does not fulfill the required lifetime
  15
  16     fn make_fut<'a>(&'a self) -> Self::Fut<'a> {
  17         async { () }
  18     }
  19 }
  20
  21 fn main() {}