// 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 add(x: proc(f64) -> f64) -> f64 {
    x(10.0)
}

pub fn main() {
    // Trailing expressions don't require parentheses:
    let y = do add |x| { x + 10.0 } + 10.0;

    assert_eq!(y, 30.0);
}