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We found another one. Something is wrong in the compilation of augmented 
assignment to subscriptions containing tuples; running this code:
class C:
 def __setitem__(self, i, v):
 print i, v
 def __getitem__(self, i):
 print i
 return 0
c = C()
c[4,5] += 1
gives a spurious exception:
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: object does not support item assignment
By contrast, "c[(4,5)] += 1" works fine.