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interactive-stream-p  stream ⇒  generalized-boolean
stream—a stream.
generalized-boolean—a generalized boolean.
Returns true if stream is an interactive stream; otherwise, returns false.
 (when (> measured limit)
   (let ((error (round (* (- measured limit) 100)
                       limit)))
     (unless (if (interactive-stream-p *query-io*)
                 (yes-or-no-p "The frammis is out of tolerance by ~D
                               Is it safe to proceed? " error)
                 (< error 15))  ;15
       (error "The frammis is out of tolerance by ~D
Should signal an error of type type-error if stream is not a stream.