error[E0507]: cannot move out of captured outer variable in an `Fn` closure
  --> $DIR/unboxed-closures-move-upvar-from-non-once-ref-closure.rs:21:9
   |
19 |     let y = vec![format!("World")];
   |         - captured outer variable
20 |     call(|| {
21 |         y.into_iter();
   |         ^ cannot move out of captured outer variable in an `Fn` closure

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0507"