// 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.

enum ast<'self> {
    num(uint),
    add(&'self ast<'self>, &'self ast<'self>)
}

fn mk_add_ok<'r>(x: &'r ast<'r>, y: &'r ast<'r>) -> ast<'r> {
    add(x, y)
}

pub fn main() {
}