anchor.diff:  ;;;; * Utils
   
   (defun lisp1s (forms)
  +  "Convert a list of forms to Lisp-1 style."
     (mapcar #'lisp1 forms))
   
   (defun lisp1b (binds)
  +  "Convert an alist of (VAR . FORM) to Lisp-1 style."
     (mapcar (lambda (bind)
   	    (cons (car bind)
   		  (lisp1 (cdr bind))))
  
positive.code: 	 :body      (lisp1s body))))
  
  (deflisp1-walker free-variable-reference (name)
    (if (and (fboundp name) (not (member name *bound-vars*)))
        (change-class form 'free-function-object-form)
        form))
  
  (deflisp1-walker application-form (operator arguments)
    (new 'free-application-form
         :operator  'funcall
         :arguments (cons (if (not (typep operator 'form))
  
negative.code: ;;;; * Walkers
  
  (deflisp1-walker form ()
    ;; By default all forms will stay the same.
    form)
  
  (deflisp1-walker if-form (consequent then else)
    ;; Transform the test and branches recursively.
    (new 'if-form
         :consequent (lisp1 consequent)
         :then       (lisp1 then)
         :else       (lisp1 else)))
  
  (deflisp1-walker lambda-function-form (arguments body)
    ;; For any function-form (ie lambda), we just transform the body.
    ;; We also must add the parameters to the list of bound variables.
    (let1 *bound-vars*
        (append (mapcar #'name arguments) *bound-vars*)
      (new 'lambda-function-form
  