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Sorry, I wasn't very clear. super() currently works by assuming that self is the first entry in f_localsplus, which is defeated, for example, by doing:
>>> class A:
... def f(self):
... del self
... super()
... 
>>> A().f()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "<stdin>", line 4, in f
SystemError: super(): arg[0] deleted
>>> class B:
... def f(self):
... self = 1
... super()
... 
>>> B().f()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "<stdin>", line 4, in f
TypeError: super(type, obj): obj must be an instance or subtype of type
I don't know if this is the intended behaviour (in which case, my assertion that obj is a tuple should be replaced by just checking whether it is a tuple and raising an exception otherwise; and I suppose the super documentation should mention this caveat), or whether this should be fixed somehow.