1 error[E0507]: cannot move out of `bar`, a captured variable in an `FnMut` closure
2 --> $DIR/borrowck-move-by-capture.rs:9:29
4 LL | let bar: Box<_> = box 3;
5 | --- captured outer variable
6 LL | let _g = to_fn_mut(|| {
7 LL | let _h = to_fn_once(move || -> isize { *bar });
10 | | move occurs because `bar` has type `Box<isize>`, which does not implement the `Copy` trait
11 | | move occurs due to use in closure
12 | move out of `bar` occurs here
14 error: aborting due to previous error
16 For more information about this error, try `rustc --explain E0507`.