[issue2217] Problem with if clause in generator expression on class level

[Georg Brandl]

Georg Brandl added the comment:

The actual equivalent would be

class A:
    a = 'test'
    def __g(_x):
        for c in _x:
            if c in a:
                yield c
    tuple(__g(a))

i.e. the outmost iterator is evaluated in the enclosing scope; not the
if clause is in its own scope, but the whole genexp.

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<http://bugs.python.org/issue2217>
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