28 lines
835 B
Rust
28 lines
835 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![allow(unknown_features)]
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#![feature(box_syntax)]
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struct Pair { a: Box<isize>, b: Box<isize> }
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pub fn main() {
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let mut x: Box<_> = box Pair {a: box 10, b: box 20};
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let x_internal = &mut *x;
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match *x_internal {
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Pair {a: ref mut a, b: ref mut _b} => {
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assert_eq!(**a, 10);
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*a = box 30;
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assert_eq!(**a, 30);
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}
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}
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}
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