rust/src/test/run-pass/task-spawn-move-and-copy.rs

fn main() {
    let p = comm::port::<uint>();
    let ch = comm::chan(p);

    let x = ~1;
    let x_in_parent = ptr::addr_of(*x) as uint;

    let y = ~2;
    let y_in_parent = ptr::addr_of(*y) as uint;

    task::spawn(fn~(copy ch, copy y, move x) {
        let x_in_child = ptr::addr_of(*x) as uint;
        comm::send(ch, x_in_child);

        let y_in_child = ptr::addr_of(*y) as uint;
        comm::send(ch, y_in_child);
    });
    // Ensure last-use analysis doesn't move y to child.
    let _q = y;

    let x_in_child = comm::recv(p);
    assert x_in_parent == x_in_child;

    let y_in_child = comm::recv(p);
    assert y_in_parent != y_in_child;
}