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I am to some extent.  I've done several wacky things, namely
putting the pgen extension module into my Basil project
(basically I think PEP 269 is dead), as well as re-written
pgen in "pure" Python (no C extension module calls)   The
pure Python pgen looks like it will be going into Pypy.  I
don't know if I am interested in the speed enough to warrant
serious analysis of the pgen C extension and the
segmentation fault Guido reported.  Let me know if you had
anything specific in mind.