| error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnOnce` |
| --> $DIR/fn-once.rs:7:19 |
| | |
| LL | let closure = use || { |
| | ^^^^^^ this closure implements `FnOnce`, not `Fn` |
| LL | vec |
| | --- closure is `FnOnce` because it moves the variable `vec` out of its environment |
| ... |
| LL | Box::new(closure) |
| | ----------------- the requirement to implement `Fn` derives from here |
| | |
| = note: required for the cast from `Box<{closure@$DIR/fn-once.rs:7:19: 7:25}>` to `Box<(dyn Fn() -> Vec<u8> + 'static)>` |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0525`. |
