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    __slots__ = ()

    async def __aenter__(self):
        return self

    @abc.abstractmethod
    async def __aexit__(self, exc_type, exc_value, traceback):
        return None

    @classmethod
    def __subclasshook__(cls, C):
        if cls is AsyncContextManager:
            if sys.version_info[:2] >= (3, 6):
                return _collections_abc._check_methods(C, "__aenter__", "__aexit__")
            if (any("__aenter__" in B.__dict__ for B in C.__mro__) and
                    any("__aexit__" in B.__dict__ for B in C.__mro__)):
                return True
        return NotImplemented

__all__.append('AsyncContextManager')
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      class BasicUser(User): ...
      class ProUser(User): ...
      class TeamUser(User): ...

    And a function that takes a class argument that's a subclass of
    User and returns an instance of the corresponding class::

      U = TypeVar('U', bound=User)
      def new_user(user_class: Type[U]) -> U:
          user = user_class()
          # (Here we could write the user object to a database)
          return user

      joe = new_user(BasicUser)

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    The resulting class has extra __annotations__ and _field_types
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    __annotations__ should be preferred, while _field_types
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        Employee = NamedTuple('Employee', name=str, id=int)

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        UserId = NewType('UserId', int)

        def name_by_id(user_id: UserId) -> str:
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        UserId('user')          # Fails type check

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