error: lifetime may not live long enough
  --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:48
   |
LL |     async fn f(self: Pin<&Self>) -> impl Clone { self }
   |                          -                     ^^^^^^^^ returning this value requires that `'_` must outlive `'static`
   |                          |
   |                          lifetime `'_` defined here
help: to allow this `impl Trait` to capture borrowed data with lifetime `'_`, add `'_` as a constraint
   |
LL |     async fn f(self: Pin<&Self>) -> impl Clone + '_ { self }
   |                                     ^^^^^^^^^^^^^^^

error: aborting due to previous error