rust/src/test/run-pass/generic-unique.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 Triple<T> { x: T, y: T, z: T }

fn box<T: Copy>(x: Triple<T>) -> ~Triple<T> { return ~x; }

fn main() {
    let x: ~Triple<int> = box::<int>(Triple{x: 1, y: 2, z: 3});
    assert (x.y == 2);
}