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1 | // Copyright 2012 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 | ||
c34b1796 | 11 | |
1a4d82fc | 12 | #![feature(unsafe_destructor)] |
223e47cc | 13 | |
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14 | use std::cell::Cell; |
15 | ||
16 | struct dtor<'a> { | |
c34b1796 | 17 | x: &'a Cell<isize>, |
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18 | } |
19 | ||
20 | #[unsafe_destructor] | |
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21 | impl<'a> Drop for dtor<'a> { |
22 | fn drop(&mut self) { | |
23 | self.x.set(self.x.get() - 1); | |
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24 | } |
25 | } | |
26 | ||
970d7e83 | 27 | fn unwrap<T>(o: Option<T>) -> T { |
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28 | match o { |
29 | Some(v) => v, | |
1a4d82fc | 30 | None => panic!() |
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31 | } |
32 | } | |
33 | ||
34 | pub fn main() { | |
1a4d82fc | 35 | let x = &Cell::new(1); |
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36 | |
37 | { | |
38 | let b = Some(dtor { x:x }); | |
1a4d82fc | 39 | let _c = unwrap(b); |
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40 | } |
41 | ||
1a4d82fc | 42 | assert_eq!(x.get(), 0); |
223e47cc | 43 | } |