| error[E0658]: `Box<Struct, impl FnMut(&mut Self)>` cannot be used as the type of `self` without the `arbitrary_self_types` feature |
| --> $DIR/could-not-resolve-issue-121503.rs:6:35 |
| | |
| LL | async fn box_ref_Struct(self: Box<Self, impl FnMut(&mut Self)>) -> &u32 { |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| | |
| = note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information |
| = help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable |
| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date |
| = help: consider changing to `self`, `&self`, `&mut self`, or a type implementing `Receiver` such as `self: Box<Self>`, `self: Rc<Self>`, or `self: Arc<Self>` |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0658`. |
