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Re: CLOS question: method combination

    True or false?

      The CLOS specification allows an auxilliary method (e.g. 
      :after, etc.) to be defined on a generic function for a
      particular set of specialized args, *even though* there is no
      primary method defined for these arg types.

    The spec says that method combination will signal an error in
    this case, so the question really has to do with when method
    combination can occur. If the answer to the question is "True",
    then I am free to define a "mixin" which qualifies a primary method
    supplied by some other class (which I know will be there when I
    instantiate). If "False", then I can't do this (ouch!).

True.  The intent is to allow just such mixins.