// Copyright 2015 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 identity(a: &u32) -> &u32 { a }

fn print_foo(f: &fn(&u32) -> &u32, x: &u32) {
    print!("{}", (*f)(x));
}

fn main() {
    let x = &4;
    let f: fn(&u32) -> &u32 = identity;

    // Didn't print 4 on optimized builds
    print_foo(&f, x);
}