error[E0373]: closure may outlive the current function, but it borrows `x`, which is owned by the current function --> $DIR/async-borrowck-escaping-closure-error.rs:5:15 | LL | Box::new((async || x)()) | ^^^^^^^^ - `x` is borrowed here | | | may outlive borrowed value `x` | note: closure is returned here --> $DIR/async-borrowck-escaping-closure-error.rs:5:5 | LL | Box::new((async || x)()) | ^^^^^^^^^^^^^^^^^^^^^^^^ help: to force the closure to take ownership of `x` (and any other referenced variables), use the `move` keyword | LL | Box::new((async move || x)()) | ++++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0373`.