error[E0759]: cannot infer an appropriate lifetime
  --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:44
   |
LL |     fn f(self: Pin<&Self>) -> impl Clone { self }
   |                ----------                  ^^^^ ...is captured here...
   |                |
   |                this data with an anonymous lifetime `'_`...
   |
note: ...and is required to live as long as `'static` here
  --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:31
   |
LL |     fn f(self: Pin<&Self>) -> impl Clone { self }
   |                               ^^^^^^^^^^
help: to declare that the `impl Trait` captures data from argument `self`, you can add an explicit `'_` lifetime bound
   |
LL |     fn f(self: Pin<&Self>) -> impl Clone + '_ { self }
   |                                          ^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0759`.