[Cython] pyregr testsuite regression

[Stefan Behnel]

Vitja Makarov, 23.08.2011 06:26:
> Hudson shows regression for last 4 pyregr builds.

Yes, I enabled the "always_allow_keywords" option for better Python 
compatibility, which disables the signature optimisation into METH_O & 
friends for def functions. That helped in a couple of cases but broke 
others. The regression appears to be mostly because generator expressions 
do not work with this option:

http://trac.cython.org/cython_trac/ticket/720

CyFunction may or may not drop the need for that option eventually, but for 
now, it would be good to fix it.

I also wouldn't object to switching it off again, in case it's not an easy 
fix (I tried but didn't find the right place to fix it).

Stefan