docs: def do_exit(self, line):
          """exit Exit from the CLI."""
          n_remaining_operations = len(self._command_processor.get_operation_queue())
          if n_remaining_operations:
              d1_cli.impl.util.print_warn(
                  """There are {} unperformed operations in the write operation queue. These will
  be lost if you exit.""".format(
                      n_remaining_operations
                  )
              )
              if not d1_cli.impl.util.confirm("Exit?", default="yes"):
                  return
          sys.exit()