error[E0507]: cannot move out of `y`, a captured variable in an `Fn` closure
  --> $DIR/unboxed-closures-move-upvar-from-non-once-ref-closure.rs:11:9
   |
LL |       let y = vec![format!("World")];
   |           - captured outer variable
LL |       call(|| {
   |  __________-
LL | |         y.into_iter();
   | |         ^ move occurs because `y` has type `Vec<String>`, which does not implement the `Copy` trait
LL | |
LL | |     });
   | |_____- captured by this `Fn` closure

error: aborting due to previous error

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