__doc__ = u"""

    >>> s = Spam()

    >>> s.e = s

    >>> s.e = 1

    Traceback (most recent call last):

    TypeError: Cannot convert int to extmember.Spam

    >>> s.e is s

    True

    >>> s.e = None

    >>> s = Bot()

    >>> s.e = s

    >>> s.e = 1

    Traceback (most recent call last):

    TypeError: Cannot convert int to extmember.Bot

    >>> s.e is s

    True

    >>> s.e = None

"""

# declared in the pxd

cdef class Spam:

    pass

# not declared in the pxd

cdef class Bot:

    cdef public Bot e