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`async` non-`move` closures with parameters are currently not supported.
Erroneous code example:
```compile_fail,edition2018,E0708
#![feature(async_closure)]
fn main() {
let add_one = async |num: u8| { // error!
num + 1
};
}
```
`async` with non-move is currently not supported with the current
version, you can use successfully by using move:
```edition2018
#![feature(async_closure)]
fn main() {
let add_one = async move |num: u8| { // ok!
num + 1
};
}
```
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