| // Copyright 2012 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. |
| |
| |
| #![allow(unknown_features)] |
| #![feature(box_syntax)] |
| |
| struct Pair { a: Box<isize>, b: Box<isize> } |
| |
| pub fn main() { |
| let mut x: Box<_> = box Pair {a: box 10, b: box 20}; |
| let x_internal = &mut *x; |
| match *x_internal { |
| Pair {a: ref mut a, b: ref mut _b} => { |
| assert_eq!(**a, 10); |
| *a = box 30; |
| assert_eq!(**a, 30); |
| } |
| } |
| } |
