!7

p {
  Thread t = startThread("Whoopsie", r {
    while licensed {
      print("sleeping");
      sleep(1000);
      print("done sleeping");
    }
  });
    
  assertEmpty(cancelledThreads());
  print("cancelling");
  cancelThread(t);
  
  repeat 20 {
    print(cancelledThreads());
    sleep(100);
  }
  assertEmpty(cancelledThreads());
  print("OK");
}