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ok. I modified the patch so that it evaluates iterator expr in 
generator expression creation time. That means, 

g = (x for x in range(10))

is equivalent to

def __gen(iter1):
    for x in iter1:
        yield x
g = __gen(range(10))

so, evalution of range(10) is not deferred anymore.

I also changed testgenexpr to testlist_gexp in 
Grammar/Grammar, since Hye-Shik Chang advised as such.
I'm willing to take any advice about this patch, so please do.