(define-condition unbound-slot (cell-error)
((instance :reader unbound-slot-instance :initarg :instance)
(slot :reader unbound-slot-slot :initarg :slot))
- (:report (lambda(condition stream)
+ (:report (lambda (condition stream)
(format stream "The slot ~S is unbound in the object ~S."
(unbound-slot-slot condition)
(unbound-slot-instance condition)))))