error[E0708]: `async` non-`move` closures with parameters are not currently supported --> $DIR/no-params-non-move-async-closure.rs:6:13 | LL | let _ = async |x: u8| {}; | ^^^^^^^^^^^^^ | = help: consider using `let` statements to manually capture variables by reference before entering an `async move` closure error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0708`.