| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // no-prefer-dynamic |
| |
| #![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); |
| } |