error[E0700]: hidden type for `impl Clone` captures lifetime that does not appear in bounds
  --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:48
   |
LL |     async fn f(self: Pin<&Self>) -> impl Clone { self }
   |                          -----                 ^^^^^^^^
   |                          |
   |                          hidden type `Pin<&Foo>` captures the anonymous lifetime defined here
   |
help: to declare that `impl Clone` captures `'_`, you can add an explicit `'_` lifetime bound
   |
LL |     async fn f(self: Pin<&Self>) -> impl Clone + '_ { self }
   |                                                ++++

error: aborting due to previous error

For more information about this error, try `rustc --explain E0700`.