__doc__ = u"""

    >>> s = Spam(Eggs("ham"))

    >>> test(s)

    'ham'

"""

cdef class Eggs:

    cdef object ham

    def __init__(self, ham):

        self.ham = ham

cdef class Spam:

    cdef Eggs eggs

    def __init__(self, eggs):

        self.eggs = eggs

cdef object tomato(Spam s):

    food = s.eggs.ham

    return food

def test(Spam s):

    return tomato(s)