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: ;;;; * Walkers
  
  (deflisp1-walker form ()
    form)
  
  (deflisp1-walker if-form (consequent then else)
    (new 'if-form
         :consequent (lisp1 consequent)
         :then       (lisp1 then)
         :else       (lisp1 else)))
  
  (deflisp1-walker lambda-function-form (arguments body)
    (let1 *bound-vars*
        (append (mapcar #'name arguments) *bound-vars*)
      (new 'lambda-function-form
  
negative.code: 
  (deflisp1-walker multiple-value-call-form (func arguments)
    (new 'multiple-value-call-form
         :func      (lisp1  func)
         :arguments (lisp1s arguments)))
  
  (deflisp1-walker multiple-value-prog1-form (first-form other-forms)
    (new 'multiple-value-prog1-form
         :first-form  (lisp1  first-form)
         :other-forms (lisp1s other-forms)))
  
  (deflisp1-walker symbol-macrolet-form (binds body)
  