rust/src/test/run-pass/box-unbox.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.

#[feature(managed_boxes)];

struct Box<T> {c: @T}

fn unbox<T:Clone>(b: Box<T>) -> T { return (*b.c).clone(); }

pub fn main() {
    let foo: int = 17;
    let bfoo: Box<int> = Box {c: @foo};
    info!("see what's in our box");
    assert_eq!(unbox::<int>(bfoo), foo);
}