cython

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__doc__ = u"""
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    >>> s = Spam()
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    >>> s.e = s
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    >>> s.e = 1
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    Traceback (most recent call last):
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    TypeError: Cannot convert int to extmember.Spam
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    >>> s.e is s
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    True
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    >>> s.e = None
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    >>> s = Bot()
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    >>> s.e = s
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    >>> s.e = 1
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    Traceback (most recent call last):
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    TypeError: Cannot convert int to extmember.Bot
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    >>> s.e is s
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    True
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    >>> s.e = None
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"""
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# declared in the pxd
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cdef class Spam:
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    pass
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# not declared in the pxd
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cdef class Bot:
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    cdef public Bot e
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