// larger than they are.
  @SuppressWarnings("FutureReturnValueIgnored")
  @Footprint(exclude = {Runnable.class, Executor.class, Thread.class, Exception.class})
  public Object measureSize() {
    for (Thread thread : blockedThreads) {
      thread.interrupt();
    }
    blockedThreads.clear();
    final Facade<Object> f = impl.newFacade();
    for (int i = 0; i < numThreads; i++) {

    }
  }

  @AfterExperiment
  void tearDown() throws Exception {
    executorService.shutdown();
  }

  @Footprint(exclude = {Runnable.class, Executor.class})
  public Object measureSize() {
    list = impl.newExecutionList();
    for (int i = 0; i < numListeners; i++) {
      list.add(listener, directExecutor());
    }
    return list.getImpl();
  }

  @Benchmark