anchor.diff:  
   // CLAW Clauses
   COLLAPSE     : 'collapse';
  +COPY         : 'copy';
   DATA         : 'data';
   DIMENSION    : 'dimension';
   FORWARD      : 'forward';
  
positive.code:     }
  ;
  
  
  /*----------------------------------------------------------------------------
   * LEXER RULES
  
negative.code: PRIVATE      : 'private';
  RANGE        : 'range';
  RESHAPE      : 'reshape';
  UPDATE       : 'update';
  
  // data copy/update clause keywords
  IN           : 'in';
  OUT          : 'out';
  
  // Directive primitive clause
  ACC          : 'acc';
  