Mark Dickinson added the comment:
Yes, good plan. I'll do that.
I'm also not sure about the 'comprehension' bit; it's true that a comprehension is syntactically valid here (e.g., "class A(x for x in range(3))"), but it's also entirely useless: it has to be the sole argument, so there can't be a metaclass argument, so the metaclass would have to be type. But type (quite sensibly) won't accept a generator as a base class.
Oh well; I suppose it doesn't *have* to make sense to be valid syntax...
This still leaves the hard part, which is distilling the essence of PEP 3115 and adding it to the reference manual.
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Python tracker
http://bugs.python.org/issue9117
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