There was actually a test that ensured that raising an exception A

with an instance of a derived class B would really raise an A, not a
B.  Since Barry fixed this anomalous behaviour, I though I might as
well fix the test!  (Hmm, Barry, did you not run the tests or did you
miss that test_opcodes failed?)

Lib/test/test_opcodes.py

@@ -49,10 +49,9 @@ a = AClass()
 b = BClass()
 
 try: raise AClass, b
-except BClass, v: raise TestFailed
-except AClass, v:
+except BClass, v:
 	if v != b: raise TestFailed
-
+else: raise TestFailed
 
 try: raise b
 except AClass, v: