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 `std::vec::Vec<std::string::String>`, which does not implement the `Copy` trait

error: aborting due to previous error

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