Add basic arg sanity checking to wrap_descr_get().  This is called when Python code calls a descriptor's __get__ method.  It should translate None to NULL in both argument positions, and insist that at least one of the argument positions is not NULL after this transformation.
Add basic arg sanity checking to wrap_descr_get().  This is called
when Python code calls a descriptor's __get__ method.  It should
translate None to NULL in both argument positions, and insist that at
least one of the argument positions is not NULL after this
transformation.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator