anchor.diff:    void visitCommentReference(CommentReference node) {
       void recordDataForCommentReference(String context, AstNode node) {
         _recordElementKind(context, node);
  -      _recordNodeClass(context, node);
         _recordTokenType(context, node);
       }
   
  
positive.code:   void addDataFrom(RelevanceData data) {
      _addToMap(byDistance, data.byDistance);
      _addToMap(byElementKind, data.byElementKind);
      _addToMap(byNodeClass, data.byNodeClass);
      _addToMap(byTokenType, data.byTokenType);
      _addToMap(byTypeMatch, data.byTypeMatch);
    }
  
negative.code:       'version': currentVersion,
        'byDistance': byDistance,
        'byElementKind': byElementKind,
        'byTokenType': byTokenType,
        'byTypeMatch': byTypeMatch,
      });
  