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Classes with forward-referenced supers.

re: Until this moment, I believed that the specification said that making an
    instance of such a class signalled an error.  . . . 

See X3J13 Document 88-002R, page 2-24, where it says of metaclass
StandardClass: "All the superclasses of a class must be defined
before an instance of the class can be made".  I interpret "defined"
to mean "finalized" as that term has been subsequently used.

-- JonL --