go func(i int) {
			timer := AfterFunc(2*Second, func() {
				t.Errorf("timer %d was not stopped", i)
			})
			Sleep(1 * Second)
			timer.Stop()
		}(i)
	}
	Sleep(3 * Second)
}

func TestSleepZeroDeadlock(t *testing.T) {
	// Sleep(0) used to hang, the sequence of events was as follows.
	// Sleep(0) sets G's status to Gwaiting, but then immediately returns leaving the status.