5 #![feature(async_fn_in_trait)]
6 #![allow(incomplete_features)]
8 trait MyTrait<'a, 'b, T> {
9 async fn foo(&'a self, key: &'b T) -> (&'a Self, &'b T);
12 impl<'a, 'b, T, U> MyTrait<'a, 'b, T> for U {
13 async fn foo(&'a self, key: &'b T) -> (&'a U, &'b T) {