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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
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LL | async fn box_ref_Struct(self: Box<Self, impl FnMut(&mut Self)>) -> &u32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= 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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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`.
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