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error[E0277]: `<F as AsyncFnMut<()>>::CallRefFuture<'_>` cannot be sent between threads safely
--> $DIR/suggest-constrain.rs:5:16
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LL | check_send(f());
| ---------- ^^^ `<F as AsyncFnMut<()>>::CallRefFuture<'_>` cannot be sent between threads safely
| |
| required by a bound introduced by this call
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= help: the trait `Send` is not implemented for `<F as AsyncFnMut<()>>::CallRefFuture<'_>`
note: required by a bound in `check_send`
--> $DIR/suggest-constrain.rs:9:18
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LL | fn check_send<T: Send>(_: T) {}
| ^^^^ required by this bound in `check_send`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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