anchor.diff:     * A table mapping element names to the node names that may have relations with elements with
      * these names.
      */
  -  IntToIntSetMap _nameToNodeNames = new IntToIntSetMap();
  +  Map<Relationship, IntToIntSetMap> _relToNameMap =
  +      new HashMap<Relationship, IntToIntSetMap>();
   
     /**
      * The [NodeManager] to get/put [IndexNode]s.
  
positive.code:   }
  
    @override
    String get statistics =>
        '[${_nodeManager.locationCount} locations, ${_sources.length} sources, ${_nameToNodeNames.length} names]';
  
    @override
    bool aboutToIndexDart(AnalysisContext context,
  
negative.code:       }
      }
    }
  
    List<Location> _getRelationshipsUniverse(Relationship relationship) {
      List<Location> locations = <Location>[];
  