On Thursday, February 14, 2013 6:43:32 AM UTC, Simon King wrote:

> If one implements a new parent P and "forgets" to override 
> sage.structure.parent_gens.ParentWithGens.gen, and then calls P.gen(), 
> one will usually see a very disturbing error. 


The solution is to not derive from old-style ParentWithGens and/or its base 
class ParentWithBase.

cdef class ParentWithBase(parent_old.Parent):
    """
    This class is being deprecated, see parent.Parent for the new model. 
    """


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