//@ run-pass

use std::sync::mpsc::channel;

pub fn main() {
    test00();
}

fn test00() {
    let _r: isize = 0;
    let mut sum: isize = 0;
    let (tx, rx) = channel();
    let number_of_messages: isize = 1000;
    let mut i: isize = 0;
    while i < number_of_messages {
        tx.send(i + 0).unwrap();
        i += 1;
    }
    i = 0;
    while i < number_of_messages {
        sum += rx.recv().unwrap();
        i += 1;
    }
    assert_eq!(sum, number_of_messages * (number_of_messages - 1) / 2);
}