anchor.diff:    ;; COMMON-LISP so we can easlily identify it later and implement it
     ;; in the compiler.
     (:import-from :common-lisp
  -                #:defpackage #:in-package #:*package*
  +                #:defpackage #:in-package #:*package* #:find-package #:export
                   #:nil #:t
                   #:otherwise
                   #:eq #:char-equal #:char= #:string-equal #:string=
  
positive.code:            #:+ #:- #:* #:/
             #:1+ #:1-
             #:zerop
             #:consp #:numberp #:characterp
             #:assert #:error
             #:defun #:defmacro
             #:nth #:elt
  
negative.code:                 #:values
                  #:multiple-value-call
                  )
    (:export #:defpackage #:in-package #:*package* #:find-package #:export
             #:nil #:t
             #:eq #:eql #:equal #:equalp #:char-equal #:char= #:string=
             #:not #:null
             #:&rest #:&body #:&key #:&optional #:&whole #:&aux
  