}
  }

  abstract static class Chopper {

    final Chopper or(Chopper you) {
      Chopper i = this;
      return new Chopper() {
        @Override
        Optional<String> chop(String str) {
          return i.chop(str).or(you.chop(str));
        }
      };
    }

    abstract Optional<String> chop(String str);

    static Chopper suffix(String suffix) {
      return new Chopper() {

    }
  }

  abstract static class Chopper {

    final Chopper or(Chopper you) {
      Chopper i = this;
      return new Chopper() {
        @Override
        Optional<String> chop(String str) {
          return i.chop(str).or(you.chop(str));
        }
      };
    }

    abstract Optional<String> chop(String str);

    static Chopper suffix(String suffix) {
      return new Chopper() {

                                test("throwsExceptionWhenPopped()") {
                                    operationDisplayName "throws EmptyStackException when popped"
                                    testDisplayName "throws EmptyStackException when popped"
                                }
                                testClass("org.example.TestingAStackDemo\$WhenNew\$AfterPushing") {

// source can change over time - i.e. for watchCache circular
// buffer. When the circular buffer is full and an event needs
// to be popped off, watchCache::startIndex is incremented. In
// this case, an interval tracking that popped event is valid
// only if it has already been copied to its internal buffer.
// However, for efficiency we perform that lazily and we mark

					}
				}
			}
			wg.Done()
		}()
	}

	// Start 1 producer.
	nPopHead := 0
	wg.Add(1)
	go func() {
		for j := 0; j < N; j++ {
			for !d.PushHead(j) {
				// Allow a popper to run.
				runtime.Gosched()
			}
			if j%10 == 0 {
				val, ok := d.PopHead()
				if ok {
					nPopHead++
					record(val.(int))
				}
			}
		}
		wg.Done()
	}()
	wg.Wait()

	// Simulate a pod being popped by the scheduler,
	// At this time, unschedulable pod should be popped.
	p1, err := q.Pop(logger)
	if err != nil {
		t.Errorf("Error while popping the head of the queue: %v", err)
	}
	if p1.Pod != unschedulablePod {
		t.Errorf("Expected that test-pod-unscheduled was popped, got %v", p1.Pod.Name)
	}

func NewDeadlineWorker(timeout time.Duration) *DeadlineWorker {
	dw := &DeadlineWorker{
		timeout: timeout,
	}
	return dw
}

// Run runs the given function, passing it a stopper channel. If the deadline passes before
// the function finishes executing, Run returns context.DeadlineExceeded to the caller.
// channel so that the work function can attempt to exit gracefully.

	s.pop(n.Pos())
	*s = append((*s), n)
}

// pop pops all nodes that appear lexically before pos
// (i.e., whose lexical extent has ended before or at pos).
// It returns the last node popped.
func (s *nodeStack) pop(pos token.Pos) (top Node) {
	i := len(*s)
	for i > 0 && (*s)[i-1].End() <= pos {
		top = (*s)[i-1]
		i--
	}
	*s = (*s)[0:i]
	return top
}

	// are popped from this heap before the scheduler looks at activeQ
	podBackoffQ *heap.Heap
	// unschedulablePods holds pods that have been tried and determined unschedulable.
	unschedulablePods *UnschedulablePods
	// schedulingCycle represents sequence number of scheduling cycle and is incremented
	// when a pod is popped.
	schedulingCycle int64

	go w.processInterval(ctx, intervalFromEvents(initEvents), 0)
	watchInitializationSignal.Wait()

	// note that we can add three events even though the chanSize is two because
	// one event has been popped off from the input chan
	if !w.add(&watchCacheEvent{Object: makePod(5), ResourceVersion: 5}, time.NewTimer(1*time.Second)) {
		t.Fatal("failed adding an even to the watcher")
	}