rust/src/test/run-pass/regions-copy-closure.rs

// 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 closure_box<'a> {
    cl: ||: 'a,
}

fn box_it(x: ||) -> closure_box {
    closure_box {cl: x}
}

pub fn main() {
    let mut i = 3i;
    assert_eq!(i, 3);
    {
        let cl = || i += 1;
        let cl_box = box_it(cl);
        (cl_box.cl)();
    }
    assert_eq!(i, 4);
}