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setf bug

    Date: 12 May 1981 05:44-EDT
    From: Gail Zacharias <GZ at MIT-MC>


    wants that SOME-LIST should be a fixnum...

This is becase it expands into:

(progn (fixnum-identity (rplaca some-list 17.)) 17.)

While you people are fixing this, could you make it expand into:

(fixnum-identity (progn (rplaca some-list (fixnum-identity 17.)) 17.))

or some other variation that does a fixnum-identity BEFORE performing
the side-effect?  This would be a useful error check to have in the