rust/src/test/run-pass/block-arg-used-as-lambda.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.

fn to_lambda(f: fn@(uint) -> uint) -> fn@(uint) -> uint {
    return f;
}

fn main() {
    let x: fn@(uint) -> uint = to_lambda(|x| x * 2u );
    let y = to_lambda(x);

    let x_r = x(22u);
    let y_r = y(x_r);

    assert x_r == 44u;
    assert y_r == 88u;
}