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1 | // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
54a0048b SL |
11 | // ignore-pretty : (#23623) problems when ending with // comments |
12 | ||
7453a54e SL |
13 | // no-prefer-dynamic |
14 | ||
62682a34 | 15 | #![allow(dead_code)] |
54a0048b | 16 | #![feature(const_fn, rustc_attrs)] |
62682a34 SL |
17 | |
18 | // check dtor calling order when casting enums. | |
19 | ||
20 | use std::sync::atomic; | |
21 | use std::sync::atomic::Ordering; | |
22 | use std::mem; | |
23 | ||
24 | enum E { | |
25 | A = 0, | |
26 | B = 1, | |
27 | C = 2 | |
28 | } | |
29 | ||
30 | static FLAG: atomic::AtomicUsize = atomic::AtomicUsize::new(0); | |
31 | ||
32 | impl Drop for E { | |
33 | fn drop(&mut self) { | |
34 | // avoid dtor loop | |
35 | unsafe { mem::forget(mem::replace(self, E::B)) }; | |
36 | ||
37 | FLAG.store(FLAG.load(Ordering::SeqCst)+1, Ordering::SeqCst); | |
38 | } | |
39 | } | |
40 | ||
54a0048b | 41 | #[rustc_no_mir] // FIXME #27840 MIR miscompiles this. |
62682a34 SL |
42 | fn main() { |
43 | assert_eq!(FLAG.load(Ordering::SeqCst), 0); | |
44 | { | |
45 | let e = E::C; | |
46 | assert_eq!(e as u32, 2); | |
47 | assert_eq!(FLAG.load(Ordering::SeqCst), 0); | |
48 | } | |
49 | assert_eq!(FLAG.load(Ordering::SeqCst), 1); | |
50 | } |