rust/src/test/run-pass/regions-params.rs

// Copyright 2012-2014 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 region_identity(x: &usize) -> &usize { x }

fn apply<T, F>(t: T, f: F) -> T where F: FnOnce(T) -> T { f(t) }

fn parameterized(x: &usize) -> usize {
    let z = apply(x, ({|y|
        region_identity(y)
    }));
    *z
}

pub fn main() {
    let x = 3;
    assert_eq!(parameterized(&x), 3);
}