@Override
              public ClosingFuture<TestCloseable> call(DeferredCloser closer) {
                closer.eventuallyClose(closeable1, closingExecutor);
                return ClosingFuture.submit(
                    new ClosingCallable<TestCloseable>() {
                      @Override
                      public TestCloseable call(DeferredCloser deferredCloser) throws Exception {
                        return closeable2;