// 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.

use std::iterator::IteratorUtil;
use std::vec;

fn w_semi(v: ~[int]) -> int {
    // the semicolon causes compiler not to
    // complain about the ignored return value:
    do v.iter().fold(0) |x,y| { x+*y };
    -10
}

fn w_paren1(v: ~[int]) -> int {
    (do v.iter().fold(0) |x,y| { x+*y }) - 10
}

fn w_paren2(v: ~[int]) -> int {
    (do v.iter().fold(0) |x,y| { x+*y} - 10)
}

fn w_ret(v: ~[int]) -> int {
    return do v.iter().fold(0) |x,y| { x+*y } - 10;
}

pub fn main() {
    assert_eq!(w_semi(~[0, 1, 2, 3]), -10);
    assert_eq!(w_paren1(~[0, 1, 2, 3]), -4);
    assert_eq!(w_paren2(~[0, 1, 2, 3]), -4);
    assert_eq!(w_ret(~[0, 1, 2, 3]), -4);
}