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error[E0658]: async closures are unstable
--> $DIR/trait-bounds-in-macro.rs:8:28
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LL | async fn foo() -> impl async Fn() { }
| ^^^^^
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= note: see issue #62290 <https://github.com/rust-lang/rust/issues/62290> for more information
= help: add `#![feature(async_closure)]` 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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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: to use an async block, remove the `||`: `async {`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
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