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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 | |
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12 | #![allow(unknown_features)] |
13 | #![feature(box_syntax)] | |
14 | ||
c34b1796 | 15 | struct Pair { a: Box<isize>, b: Box<isize> } |
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16 | |
17 | pub fn main() { | |
c34b1796 | 18 | let mut x: Box<_> = box Pair {a: box 10, b: box 20}; |
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19 | let x_internal = &mut *x; |
20 | match *x_internal { | |
21 | Pair {a: ref mut a, b: ref mut _b} => { | |
22 | assert!(**a == 10); *a = box 30; assert!(**a == 30); | |
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23 | } |
24 | } | |
25 | } |