#| -*-Scheme-*-
-$Id: bitutl.scm,v 1.8 1993/12/23 11:14:25 cph Exp $
+$Id: bitutl.scm,v 1.9 1994/02/02 04:03:50 adams Exp $
Copyright (c) 1987-1993 Massachusetts Institute of Technology
(define (find-operator keyword)
(let ((place (assq keyword operators)))
- (if (null? place)
+ (if (not place)
(error "evaluate: unknown operator:" keyword))
((cdr place))))
#| -*-Scheme-*-
-$Id: syerly.scm,v 1.9 1993/12/08 17:44:21 gjr Exp $
+$Id: syerly.scm,v 1.10 1994/02/02 04:05:29 adams Exp $
Copyright (c) 1988-1993 Massachusetts Institute of Technology
operands)))
(else
(let ((place (assq (car instruction) early-instructions)))
- (if (null? place)
+ (if (not place)
(ierror "unknown opcode"))
(let ((opcode (car instruction))
(body (cdr instruction))