println("timer heap len", len(ts.heap), "!= atomic len", n)
		throw("bad timer heap len")
	}
}

// updateMinWhenHeap sets ts.minWhenHeap to ts.heap[0].when.
// The caller must have locked ts or the world must be stopped.
func (ts *timers) updateMinWhenHeap() {
	assertWorldStoppedOrLockHeld(&ts.mu)
	if len(ts.heap) == 0 {
		ts.minWhenHeap.Store(0)
	} else {