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error[E0525]: expected a closure that implements the `AsyncFn` trait, but this closure only implements `AsyncFnMut`
--> $DIR/kind-due-to-arg-with-box-wrap.rs:13:32
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LL | takes_asyncfn(Box::new(async || self.an_async_fn().await));
| ------------- ---------^^^^^^^^--------------------------
| | | | |
| | | | closure is `AsyncFnMut` because it mutates the variable `*self` here
| | | this closure implements `AsyncFnMut`, not `AsyncFn`
| | the requirement to implement `AsyncFn` derives from here
| required by a bound introduced by this call
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= note: required for `Box<{async closure@$DIR/kind-due-to-arg-with-box-wrap.rs:13:32: 13:40}>` to implement `AsyncFn()`
note: required by a bound in `takes_asyncfn`
--> $DIR/kind-due-to-arg-with-box-wrap.rs:18:32
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LL | async fn takes_asyncfn(_: impl AsyncFn()) {
| ^^^^^^^^^ required by this bound in `takes_asyncfn`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0525`.
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