Changes from Jonathan Riehl to allow his pgen extension (PEP 269) to work. This includes some more code that used to be part of pgen in the main parser; I'm okay with that. I'll see if the Windows build needs work next.

"""This is a test"""
from __future__ import nested_scopes
from __future__ import rested_snopes

def f(x):
    def g(y):
        return x + y
    return g

print f(2)(4)