src/test/run-pass/issue-6153.rs


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// Copyright 2013 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.

fn swap(f: |~[int]| -> ~[int]) -> ~[int] {
    let x = ~[1, 2, 3];
    f(x)
}

pub fn main() {
    let v = swap(|mut x| { x.push(4); x });
    let w = swap(|mut x| { x.push(4); x });
    assert_eq!(v, w);
}