[Cython] "__ipow__ has wrong number of arguments" is back here

[Vitja Makarov]

Hi!

I noticed that this error came back again.

https://sage.math.washington.edu:8091/hudson/view/cython-devel/job/cython-devel-tests-py26-c/lastCompletedBuild/testReport/(root)/CythonRunTestCase/compiling__c__and_running_special_methods_T561/

-- 
vitja.