anchor.diff:            HashMap<String, Element> exportedNames =
                 _createExportMapping(exportedLibrary, visitedElements);
             exportedNames = _applyCombinators(exportedNames, element.combinators);
  -          _addAllFromMap(definedNames, exportedNames);
  +          definedNames.addAll(exportedNames);
           }
         }
         _addAllFromNamespace(definedNames,
  
positive.code:    * @param definedNames the mapping table to which the names in the given namespace are to be added
     * @param namespace the namespace containing the names to be added to this namespace
     */
    void _addAllFromMap(
        Map<String, Element> definedNames, Map<String, Element> newNames) {
      newNames.forEach((String name, Element element) {
        definedNames[name] = element;
      });
    }
  
    /**
     * Add all of the names in the given namespace to the given mapping table.
     *
     * @param definedNames the mapping table to which the names in the given namespace are to be added
     * @param namespace the namespace containing the names to be added to this namespace
     */
    void _addAllFromNamespace(
        Map<String, Element> definedNames, Namespace namespace) {
      if (namespace != null) {
        _addAllFromMap(definedNames, namespace.definedNames);
      }
    }
  
  
negative.code:    * @param overrides the overrides to be applied
     */
    void applyOverrides(Map<VariableElement, DartType> overrides) {
      _overridenTypes.addAll(overrides);
    }
  
    /**
  