| #![allow(dead_code)] |
| |
| // check dtor calling order when casting enums. |
| |
| use std::sync::atomic; |
| use std::sync::atomic::Ordering; |
| use std::mem; |
| |
| enum E { |
| A = 0, |
| B = 1, |
| C = 2 |
| } |
| |
| static FLAG: atomic::AtomicUsize = atomic::AtomicUsize::new(0); |
| |
| impl Drop for E { |
| fn drop(&mut self) { |
| // avoid dtor loop |
| unsafe { mem::forget(mem::replace(self, E::B)) }; |
| |
| FLAG.store(FLAG.load(Ordering::SeqCst)+1, Ordering::SeqCst); |
| } |
| } |
| |
| fn main() { |
| assert_eq!(FLAG.load(Ordering::SeqCst), 0); |
| { |
| let e = E::C; |
| assert_eq!(e as u32, 2); |
| assert_eq!(FLAG.load(Ordering::SeqCst), 0); |
| } |
| assert_eq!(FLAG.load(Ordering::SeqCst), 0); |
| } |