settableFuture.set(null);
    assertThat(getDone(stackDepthCheck))
        .isLessThan(Thread.currentThread().getStackTrace().length + 100);
  }

  public void testAvoidsStackOverflow_alternatingCancelledAndSubmitted() throws Exception {
    SettableFuture<@Nullable Void> settableFuture = SettableFuture.create();
    ListenableFuture<@Nullable Void> unused =
        serializer.submitAsync(