rust/src/test/run-fail/task-comm-recv-block.rs

// error-pattern:goodfail

use std;
import task;
import comm;

fn goodfail(&&_i: ()) {
    task::yield();
    fail "goodfail";
}

fn main() {
    task::spawn((), goodfail);
    let po = comm::port();
    // We shouldn't be able to get past this recv since there's no
    // message available
    let i: int = comm::recv(po);
    fail "badfail";
}