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(|| {
   |          -- captured by this `Fn` closure
LL |         y.into_iter();
   |         ^ ----------- `y` moved due to this method call
   |         |
   |         move occurs because `y` has type `Vec<String>`, which does not implement the `Copy` trait
   |
note: this function takes ownership of the receiver `self`, which moves `y`
  --> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL
   |
LL |     fn into_iter(self) -> Self::IntoIter;
   |                  ^^^^

error: aborting due to previous error

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