rust/src/test/run-pass/alt-ref-binding-mut.rs

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// 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.
struct Rec {
f: int
}
fn destructure(x: &mut Rec) {
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match *x {
Rec {f: ref mut f} => *f += 1
}
}
fn main() {
let mut v = Rec {f: 22};
destructure(&mut v);
assert v.f == 23;
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}