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I have updated the bitbucket repo with changes to address most of Benjamin's review comments.
A few points of note:
- I agree in principle with the idea of splitting Yield and YieldFrom into distinct AST nodes, but I'd prefer to focus on getting the current implementation into the main repo first
- in cleaning up the handling of missing send/close/throw attributes on subiterators I discovered that the PyObject_CallMethod* APIs were discarding exception information and coercing everything to a terse AttributeError. The branch now changes them to allow the error reported by the underlying call to PyObject_GetAttr to pass through unmodified.
- the generator close() method treats an AttributeError as expected when looking for a close() method on the subiterator, but uses WriteUnraisable to deal with anything else.
- I share Benjamin's suspicion that some of the INCREF/DECREF pairs in genobject.c aren't actually necessary, but I don't think it's worth messing with them at this stage.
I haven't looked at Zbyszek's proposed doc changes at this point - the pull request has a lot of irrelevant line wrapping changes in it, so it makes it hard to review.