rust/src/test/ui/borrowck/borrowck-move-by-capture.stderr

error[E0507]: cannot move out of `bar`, a captured variable in an `FnMut` closure
  --> $DIR/borrowck-move-by-capture.rs:9:29
   |
LL |       let bar: Box<_> = box 3;
   |           --- captured outer variable
LL |       let _g = to_fn_mut(|| {
   |  ________________________-
LL | |         let _h = to_fn_once(move || -> isize { *bar });
   | |                             ^^^^^^^^^^^^^^^^   ----
   | |                             |                  |
   | |                             |                  move occurs because `bar` has type `Box<isize>`, which does not implement the `Copy` trait
   | |                             |                  move occurs due to use in closure
   | |                             move out of `bar` occurs here
LL | |     });
   | |_____- captured by this `FnMut` closure

error: aborting due to previous error

For more information about this error, try `rustc --explain E0507`.