相关疑难解决方法(0)

我在网上找到了本课的代码(http://groups.csail.mit.edu/mac/ftpdir/6.001-fall91/ps4/matcher-from-lecture.scm),我有一段时间了试图调试它.该代码看起来与Sussman所写的相当:

;;; Scheme code from the Pattern Matcher lecture

;; Pattern Matching and Simplification

(define (match pattern expression dictionary)
  (cond ((eq? dictionary 'failed) 'failed)
        ((atom? pattern)
         (if (atom? expression)
             (if (eq? pattern expression)
                 dictionary
                 'failed)
             'failed))
        ((arbitrary-constant? pattern)
         (if (constant? expression)
             (extend-dictionary pattern expression dictionary)
             'failed))
        ((arbitrary-variable? pattern)
         (if (variable? expression)
             (extend-dictionary pattern expression dictionary)
             'failed))
        ((arbitrary-expression? pattern)
         (extend-dictionary pattern expression dictionary))
        ((atom? expression) 'failed)
        (else
         (match (cdr pattern)
                (cdr expression)
                (match (car pattern)
                       (car expression)
                       dictionary)))))

(define (instantiate skeleton …