rust/src/test/run-pass/task-comm-10.rs

use std;
import task;
import comm;

fn start(c: comm::chan<comm::chan<~str>>) {
    let p = comm::port();
    comm::send(c, comm::chan(p));

    let mut a;
    let mut b;
    a = comm::recv(p);
    assert a == ~"A";
    log(error, a);
    b = comm::recv(p);
    assert b == ~"B";
    log(error, b);
}

fn main() {
    let p = comm::port();
    let ch = comm::chan(p);
    let child = task::spawn(|| start(ch) );

    let c = comm::recv(p);
    comm::send(c, ~"A");
    comm::send(c, ~"B");
    task::yield();
}