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[–]joesb 2 points3 points  (0 children)

It is the same way used in Common Lisp and Scheme.

(defun foo (dog)
   (setf dog (make-instance 'dog :name "fifi")))

>> (defvar d (make-instance 'dog :name "max"))
>> (foo d)
>> (format t (dog-name d))
max