Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

This isn't so easy. You can't just access new slot, because this is binary 
incompatible. You should add new type flag, say Py_TPFLAGS_HAVE_CLASS, set it 
for all classes with tp_as_class, and guard access to tp_as_class with

    if (!PyType_HasFeature(tp, Py_TPFLAGS_HAVE_CLASS))

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32332>
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