// 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.

fn borrow(v: &int, f: &fn(x: &int)) {
    f(v);
}

fn box_imm() {
    let mut v = ~3;
    do borrow(v) |w| {
        v = ~4; //~ ERROR cannot assign to `v` because it is borrowed
        assert!(*v == 3);
        assert!(*w == 4);
    }
}

fn main() {
}