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Agreed. I'd prefer the current implementation's behavor
rather than defined in PEP289. Yes, It's incompatible with
list comprehensions but generator expressions are already
quite different enough from it. :)

How about to change PEP289's genexpr semantics to this?

g = (x**2 for x in range(10))
print g.next()

is equivalent to:

def __gen(_i1):
    for x in _i1:
        yield x**2
g = __gen(range(10))
print g.next()