;;; COND defined in terms of IF
(defmacro-mundanely cond (&rest clauses)
(if (endp clauses)
- nil
- (let ((clause (first clauses)))
- (if (atom clause)
- (error "Cond clause is not a list: ~S" clause)
- (let ((test (first clause))
- (forms (rest clause)))
- (if (endp forms)
- (let ((n-result (gensym)))
- `(let ((,n-result ,test))
- (if ,n-result
- ,n-result
- (cond ,@(rest clauses)))))
- `(if ,test
- (progn ,@forms)
- (cond ,@(rest clauses)))))))))
+ nil
+ (let ((clause (first clauses)))
+ (if (atom clause)
+ (error "COND clause is not a list: ~S" clause)
+ (let ((test (first clause))
+ (forms (rest clause)))
+ (if (endp forms)
+ (let ((n-result (gensym)))
+ `(let ((,n-result ,test))
+ (if ,n-result
+ ,n-result
+ (cond ,@(rest clauses)))))
+ `(if ,test
+ (progn ,@forms)
+ (cond ,@(rest clauses)))))))))
;;; other things defined in terms of COND
(defmacro-mundanely when (test &body forms)