anchor.diff:  
   
   
  -Copyright Pascal J. Bourguignon 2012 - 2015
  +Copyright Pascal J. Bourguignon 2012 - 2022
   This package is provided under the Afero General Public License 3.
   See the source file for details.
   
  
positive.code: BUGS: we should probably design it with hooks so that clients may
        define the stepping/tracing user interface.
  
  Copyright Pascal J. Bourguignon 2012 - 2015
  This package is provided under the Afero General Public License 3.
  See the source file for details.
  
  
negative.code: ;;;;AUTHORS
  ;;;;    <PJB> Pascal J. Bourguignon <pjb@informatimago.com>
  ;;;;MODIFICATIONS
  ;;;;    2022-07-14 <PJB> Corrected bug with ABORT-STEPPING.
  ;;;;    2012-08-09 <PJB> Extracted from stepper.lisp
  ;;;;BUGS
  ;;;;LEGAL
  ;;;;    AGPL3
  ;;;;
  ;;;;    Copyright Pascal J. Bourguignon 2012 - 2022
  ;;;;
  ;;;;    This program is free software: you can redistribute it and/or modify
  ;;;;    it under the terms of the GNU Affero General Public License as published by
  