impure fn main() -> () {
   test00();
}

impure fn test00() {
    let int r = 0;    
    let int sum = 0;
    let port[int] p = port();
    
    let chan[int] c0 = chan(p);
    let chan[int] c1 = chan(p);
    let chan[int] c2 = chan(p);
    let chan[int] c3 = chan(p);
    
    let int number_of_messages = 1000;

    let int i = 0;
    while (i < number_of_messages) {
        c0 <| i;
        c1 <| i;
        c2 <| i;
        c3 <| i;
        i += 1;
    }

    i = 0;
    while (i < number_of_messages) {
        r <- p; sum += r;
        r <- p; sum += r;
        r <- p; sum += r;
        r <- p; sum += r;
        i += 1;
    }

    check (sum == 1998000);
    // check (sum == 4 * ((number_of_messages * 
    //                   (number_of_messages - 1)) / 2));
}