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Thanks for the quick explanation. I understand that class scopes don't
extend and this is documented behavior.
However, the question is why the if clause is executed in a scope of its
own and where this is documented.
You would expect that the problematic generator expression is equivalent
to the following code which works fine:
class A:
 a = 'test'
 def __g(a):
 for c in a:
 if c in a:
 yield c
 tuple(__g(a))