anchor.diff:  ;;;;USER-INTERFACE:    UNIX
   ;;;;DESCRIPTION
   ;;;;    This module exports some list utility functions.
  -;;;;USAGE
  -;;;;
   ;;;;AUTHORS
   ;;;;    <PJB> Pascal J. Bourguignon <pjb@informatimago.com>
   ;;;;MODIFICATIONS
  +;;;;    2012-03-14 <PJB> Added plist-keys.
   ;;;;    2012-02-19 <PJB> Moved HASHED-* functions that work on sequence to
   ;;;;                     COM.INFORMATIMAGO.COMMON-LISP.CESARUM.SEQUENCE.
   ;;;;    2011-04-03 <PJB> Added LIST-LENGTHS.
  
positive.code:       :finally (return (values i i 0)))))
  
  
  
  (defun plist-put (plist prop value)
    "
  
negative.code: ;;;;LEGAL
  ;;;;    GPL
  ;;;;
  ;;;;    Copyright Pascal J. Bourguignon 2002 - 2012
  ;;;;
  ;;;;    This script is free software; you can redistribute it and/or
  ;;;;    modify it under the terms of the GNU  General Public
  