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a code path executed on error (goto bail).
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Extending an unitialized type with type->tp_mro == NULL must
throw a reasonable TypeError exception, instead of failing
with PyErr_BadInternalCall.
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Attribute lookup on a super object must be aware that
its target type can be uninitialized (type->tp_mro == NULL).
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gh-92112: A custom mro() returning a result conflicting with
__bases__ and deleting itself caused a double free.
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