This can happen either because a subclass includes a slot specifier with the same name as a slot specified in a superclass or because multiple superclasses specify slots with the same name.

Multiple inheritance doesn't dramatically change any of the mechanisms of inheritance I've discussed so far--every user-defined class already has multiple superclasses since they all extend STANDARD-OBJECT, which extends T, and so have at least two superclasses. Thus, methods specialized on different classes could end up manipulating the same slot when applied to a class that extends those classes.

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