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// Copyright 2012-2014 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.
#[cfg(feature = "use_core")]
extern crate core;
#[macro_use]
extern crate derivative;
fn f(arg: &mut A) {
arg.a = 100;
}
#[derive(Derivative)]
#[derivative(Copy, Clone)]
struct A { a: isize }
#[test]
fn main() {
let mut x = A {a: 10};
f(&mut x);
assert_eq!(x.a, 100);
x.a = 20;
let mut y = x;
f(&mut y);
assert_eq!(x.a, 20);
}
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