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