message: test AtomicU64
diff: -use std::sync::atomic::{AtomicBool, AtomicIsize, Ordering::*};
  +use std::sync::atomic::{AtomicBool, AtomicIsize, AtomicU64, Ordering::*};
  fn main() {
  atomic_bool();
  atomic_isize();
  + atomic_u64();
  }
  fn atomic_bool() {
  @@ -50,3 +51,12 @@ fn atomic_isize() {
  ATOMIC.compare_exchange_weak(0, 1, SeqCst, Acquire).ok();
  ATOMIC.compare_exchange_weak(0, 1, SeqCst, SeqCst).ok();
  }
  +
  +fn atomic_u64() {
  + static ATOMIC: AtomicU64 = AtomicU64::new(0);
  +
  + ATOMIC.store(1, SeqCst);
  + assert_eq!(ATOMIC.compare_exchange(0, 0x100, AcqRel, Acquire), Err(1));
  + assert_eq!(ATOMIC.compare_exchange_weak(1, 0x100, AcqRel, Acquire), Ok(1));
  + assert_eq!(ATOMIC.load(Relaxed), 0x100);
  +}
  