| error[E0277]: `<F as AsyncFnMut<()>>::CallRefFuture<'_>` cannot be sent between threads safely |
| --> $DIR/suggest-constrain.rs:5:16 |
| | |
| LL | check_send(f()); |
| | ---------- ^^^ `<F as AsyncFnMut<()>>::CallRefFuture<'_>` cannot be sent between threads safely |
| | | |
| | required by a bound introduced by this call |
| | |
| = 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 |
| | |
| 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`. |
