# Pastebin YM3IU02f
        #
        # This method covers all ways in which the Python statement
        # "raise X, Y" can produce a valid exception type and instance.
        #
        # In the following table, 'Class' means a subclass of BaseException
        # and 'inst' is an instance of either 'Class' or a subclass of it.
        #
        # The flow object space only deals with non-advanced case.
        #
        #  input (w_type, w_value)... becomes...                advanced case?
        # ---------------------------------------------------------------------
        #  (Class, None)              (Class, Class())                no
        #  (Class, inst)              (inst.__class__, inst)          no
        #  (Class, tuple)             (Class, Class(*tuple))          yes
        #  (Class, x)                 (Class, Class(x))               no
        #  (inst, None)               (inst.__class__, inst)          no