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

[Stefan Behnel]

Stefan Behnel wrote:
> 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?

Found it myself.

(complete patch and bundle attached)

Stefan
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