(let ((value (clos-slots-ref (fsc-instance-slots instance)
index)))
(if (eq value +slot-unbound+)
(slot-unbound (class-of instance) instance slot-name)
value)))
(lambda (instance)
(let ((value (clos-slots-ref (fsc-instance-slots instance)
index)))
(if (eq value +slot-unbound+)
(slot-unbound (class-of instance) instance slot-name)
value)))
(lambda (instance)