(error 'simple-type-error
:datum datum
:expected-type '(or symbol string)
- :format-control "bad argument to ~S: ~S"
- :format-arguments (list fun-name datum)))))
+ :format-control "Condition designator ~s is not of type ~s."
+ :format-arguments (list datum
+ '(or symbol string))))))
(define-condition layout-invalid (type-error)
()