anchor.diff:            (my-circle (make-instance 'circle))
             (my-color (make-instance 'color)))
         (get-kind my-shape)
  -      (assert-equal ____ *last-kind-accessor*)
  +      (assert-equal :shape *last-kind-accessor*)
         (get-kind my-circle)
  -      (assert-equal ____ *last-kind-accessor*)
  +      (assert-equal :circle *last-kind-accessor*)
         (get-kind my-color)
  -      (assert-equal ____ *last-kind-accessor*)
  +      (assert-equal :color *last-kind-accessor*)
         (get-kind my-colored-circle)
  -      (assert-equal ____ *last-kind-accessor*)
  +      (assert-equal :color *last-kind-accessor*)
         (get-kind my-circled-color)
  -      (assert-equal ____ *last-kind-accessor*)))
  +      (assert-equal :circle *last-kind-accessor*)))
   
   
   ;; Todo: consider adding :before and :after method control instructions.
  
positive.code: (define-test test-multiple-inheritance
      (let ((my-colored-circle (make-instance 'colored-circle))
            (my-circled-color (make-instance 'circled-color)))
        (assert-equal ____ (get-kind my-colored-circle))
        (assert-equal ____ (get-kind my-circled-color))))
  
  
  (defvar *last-kind-accessor* nil)
  
negative.code: (define-test test-inheritance
      (let ((circle-1 (make-instance 'circle))
            (shape-1 (make-instance 'shape)))
        (assert-equal 'shape (type-of shape-1))
        (assert-equal 'circle (type-of circle-1))
        (true-or-false? t (typep circle-1 'circle))
        (true-or-false? t (typep circle-1 'shape))
        (set-kind :circle circle-1)
        (set-pos '(3 4) circle-1)
        (set-radius 5 circle-1)
        (assert-equal '(3 4) (get-pos circle-1))
        (assert-equal 5 (get-radius circle-1))))
  
  ;; Classes may also inherit from more than one base class.
  ;; This is known as multiple inheritance.
  