docs: def _get_corresponding_parsers(self, func):
          """Get the parser that has been set up by the given `function`"""
          if func in self._used_functions:
              yield self
          if self._subparsers_action is not None:
              for parser in self._subparsers_action.choices.values():
                  for sp in parser._get_corresponding_parsers(func):
                      yield sp