import asyncio
import datetime
from typing import Type
class tzutc(datetime.tzinfo):
    pass
_EPOCHTZ = datetime.datetime(1970, 1, 1, tzinfo=tzutc())
class FakeDateMeta(type):
    def __instancecheck__(self, obj):
        return True
class FakeDate(datetime.date, metaclass=FakeDateMeta):
    pass
def pickle_fake_date(datetime_) -> Type[FakeDate]:
    # A pickle function for FakeDate
    return FakeDate

$ python -c 'import repro'
python: Objects/typeobject.c:143: managed_static_type_index_get: Assertion `managed_static_type_index_is_set(self)' failed.
Aborted (core dumped)