Generators had their throw() method allowing string exceptions. That's a

no-no.

Fixes issue #1147.  Need to fix 2.5 to raise a proper warning if a string
exception is passed in.

Lib/test/test_generators.py

@@ -1622,7 +1622,7 @@ ValueError: 7
 >>> f().throw("abc")     # throw on just-opened generator
 Traceback (most recent call last):
   ...
-abc
+TypeError: exceptions must be classes, or instances, not str
 
 Now let's try closing a generator: