1cdef class B(A):
2  cpdef foo(self):
3    """
4    >>> B().foo()
5    B
6    """
7    print "B"
8
9cdef class A(object):
10  cpdef foo(self):
11    """
12    >>> A().foo()
13    A
14    """
15    print "A"
16
17cdef class C(A):
18  cpdef foo(self):
19    """
20    >>> C().foo()
21    C
22    """
23    print "C"
24