[Pyrex] [Cython-dev] fix for tp_clear()

[Stefan Behnel]

Hi,

while I was at it, here is a patch that diverts the tp_clear/tp_traverse type
function pointers to the parent type if the type itself does not have any
object attributes.

It's a bit clumsy in that it decides the availability of the parent functions
based on the module name. What would be a better way to find out if the parent
type was defined in the same scope?

Stefan
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