;;; This has some diagnostic stuff
 
 ;;; This forces all delays in a structure
 
 (define (force-all x)
   (cond ((delay? x)
 	 (force-all (force x)))
 	((pair? x)
 	 (force-all (car x))
 	 (force-all (cdr x)))
 	((vector? x)
 	 (dotimes (i (vector-length x))
             (force-all (vector-ref x i)))))
   x)
 
 ;;; This forces & removes all delays in a structure.
 
 (define (remove-delays x)
   (cond ((delay? x)
 	 (remove-delays (force x)))
 	((pair? x)
 	 (cons (remove-delays (car x))
 	       (remove-delays (cdr x))))
 	((vector? x)
 	 (list->vector (map (function remove-delays) (vector->list x))))
 	(else x)))
 
 (define (delay? x)
   (and (pair? x)
        (or (eq? (car x) '#t)
 	   (eq? (car x) '#f))))