How to use the memoization.backport.backport_enum.Enum function in memoization

members.sort(key=lambda t: t[0])
        cls = cls(name, members, module=module)
        cls.__reduce_ex__ = _reduce_ex_by_name
        module_globals.update(cls.__members__)
        module_globals[name] = cls
        return cls


class IntEnum(int, Enum):
    """Enum where members are also (and must be) ints"""


def _reduce_ex_by_name(self, proto):
    return self.name

class Flag(Enum):
    """Support for flags"""

    def _generate_next_value_(name, start, count, last_values):
        """
        Generate the next value when not given.

        name: the name of the member
        start: the initital start value or None
        count: the number of existing members
        last_value: the last value assigned or None
        """
        if not count:
            return start if start is not None else 1
        for last_value in reversed(last_values):
            try:
                high_bit = _high_bit(last_value)

# things break (such as pickle)
        for name in ('__repr__', '__str__', '__format__', '__reduce_ex__'):
            class_method = getattr(enum_class, name)
            obj_method = getattr(member_type, name, None)
            enum_method = getattr(first_enum, name, None)
            if obj_method is not None and obj_method is class_method:
                setattr(enum_class, name, enum_method)

        # replace any other __new__ with our own (as long as Enum is not None,
        # anyway) -- again, this is to support pickle
        if Enum is not None:
            # if the user defined their own __new__, save it before it gets
            # clobbered in case they subclass later
            if save_new:
                enum_class.__new_member__ = __new__
            enum_class.__new__ = Enum.__new__

        # py3 support for definition order (helps keep py2/py3 code in sync)
        if _order_ is not None:
            if isinstance(_order_, str):
                _order_ = _order_.replace(',', ' ').split()
            if _order_ != enum_class._member_names_:
                raise TypeError('member order does not match _order_')

        return enum_class

def _find_data_type(bases):
            for chain in bases:
                for base in chain.__mro__:
                    if base is object:
                        continue
                    elif '__new__' in base.__dict__:
                        if issubclass(base, Enum):
                            continue
                        return base

def __contains__(cls, member):
        if not isinstance(member, Enum):
            import warnings
            warnings.warn(
                    "using non-Enums in containment checks will raise "
                    "TypeError in Python 3.8",
                    DeprecationWarning, 2)
        return isinstance(member, cls) and member._name_ in cls._member_map_

for name in source.keys()
                if filter(name)]
        try:
            # sort by value
            members.sort(key=lambda t: (t[1], t[0]))
        except TypeError:
            # unless some values aren't comparable, in which case sort by name
            members.sort(key=lambda t: t[0])
        cls = cls(name, members, module=module)
        cls.__reduce_ex__ = _reduce_ex_by_name
        module_globals.update(cls.__members__)
        module_globals[name] = cls
        return cls


class IntEnum(int, Enum):
    """Enum where members are also (and must be) ints"""


def _reduce_ex_by_name(self, proto):
    return self.name

class Flag(Enum):
    """Support for flags"""

    def _generate_next_value_(name, start, count, last_values):
        """
        Generate the next value when not given.

        name: the name of the member
        start: the initital start value or None
        count: the number of existing members