error[E0658]: `Wrap<&Struct, Struct>` cannot be used as the type of `self` without the `arbitrary_self_types` feature
  --> $DIR/ref-self-async.rs:47:39
   |
LL |     async fn wrap_ref_Self_Self(self: Wrap<&Self, Self>, f: &u8) -> &u8 {
   |                                       ^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/44874
   = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
   = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.