logger.get().log(SEVERE, "Uh oh! An open ClosingFuture has leaked and will close: {0}", this);
      FluentFuture<V> unused = finishToFuture();
    }
  }

  private static void closeQuietly(@CheckForNull final Closeable closeable, Executor executor) {
    if (closeable == null) {
      return;
    }
    try {
      executor.execute(
          () -> {
            try {