src/test/run-pass/match-implicit-copy-unique.rs

   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
  11
  12 #![allow(unknown_features)]
  13 #![feature(box_syntax)]
  14
  15 struct Pair { a: Box<isize>, b: Box<isize> }
  16
  17 pub fn main() {
  18     let mut x: Box<_> = box Pair {a: box 10, b: box 20};
  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);
  23       }
  24     }
  25 }