message: test calling Box<dyn FnOnce>
diff: @@ -40,9 +40,14 @@ fn fn_once_closure_with_multiple_args() -> i64 {
  }
  }
  +fn boxed(f: Box<dyn FnOnce() -> i32>) -> i32 {
  + f()
  +}
  +
  fn main() {
  assert_eq!(simple(), 12);
  assert_eq!(crazy_closure(), (84, 10, 10));
  assert_eq!(closure_arg_adjustment_problem(), 3);
  assert_eq!(fn_once_closure_with_multiple_args(), 6);
  + assert_eq!(boxed(Box::new({let x = 13; move || x})), 13);
  }
  