src/test/ui/mir/mir_fat_ptr_drop.rs

   1 // run-pass
   2 #![allow(unused_variables)]
   3 #![allow(stable_features)]
   4
   5 // test that ordinary fat pointer operations work.
   6
   7 #![feature(braced_empty_structs)]
   8 #![feature(rustc_attrs)]
   9
  10 use std::sync::atomic;
  11 use std::sync::atomic::Ordering::SeqCst;
  12
  13 static COUNTER: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
  14
  15 struct DropMe {
  16 }
  17
  18 impl Drop for DropMe {
  19     fn drop(&mut self) {
  20         COUNTER.fetch_add(1, SeqCst);
  21     }
  22 }
  23
  24 fn fat_ptr_move_then_drop(a: Box<[DropMe]>) {
  25     let b = a;
  26 }
  27
  28 fn main() {
  29     let a: Box<[DropMe]> = Box::new([DropMe { }]);
  30     fat_ptr_move_then_drop(a);
  31     assert_eq!(COUNTER.load(SeqCst), 1);
  32 }