tests/ui/unboxed-closures/unboxed-closures-move-some-upvars-in-by-ref-closure.rs

   1 // run-pass
   2 // Test that in a by-ref once closure we move some variables even as
   3 // we capture others by mutable reference.
   4
   5 fn call<F>(f: F) where F : FnOnce() {
   6     f();
   7 }
   8
   9 fn main() {
  10     let mut x = vec![format!("Hello")];
  11     let y = vec![format!("World")];
  12     call(|| {
  13         // Here: `x` must be captured with a mutable reference in
  14         // order for us to append on it, and `y` must be captured by
  15         // value.
  16         for item in y {
  17             x.push(item);
  18         }
  19     });
  20     assert_eq!(x.len(), 2);
  21     assert_eq!(&*x[0], "Hello");
  22     assert_eq!(&*x[1], "World");
  23 }