anchor.diff:    void addDataFrom(RelevanceData data) {
       _addToMap(byDistance, data.byDistance);
       _addToMap(byElementKind, data.byElementKind);
  -    _addToMap(byNodeClass, data.byNodeClass);
       _addToMap(byTokenType, data.byTokenType);
       _addToMap(byTypeMatch, data.byTypeMatch);
     }
  
positive.code:   void visitCommentReference(CommentReference node) {
      void recordDataForCommentReference(String context, AstNode node) {
        _recordElementKind(context, node);
        _recordNodeClass(context, node);
        _recordTokenType(context, node);
      }
  
  
negative.code:   void _recordDataForNode(String context, AstNode node,
        {List<Keyword> allowedKeywords = noKeywords}) {
      _recordElementKind(context, node);
      _recordReferenceDepth(node);
      _recordTokenDistance(node);
      _recordTokenType(context, node, allowedKeywords: allowedKeywords);
  