anchor.diff:     * @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);
  +      definedNames.addAll(namespace.definedNames);
       }
     }
   
  
positive.code:    * @param overrides the overrides to be applied
     */
    void applyOverrides(Map<VariableElement, DartType> overrides) {
      overrides.forEach((VariableElement element, DartType type) {
        _overridenTypes[element] = type;
      });
    }
  
    /**
  
negative.code:           HashMap<String, Element> exportedNames =
                _createExportMapping(exportedLibrary, visitedElements);
            exportedNames = _applyCombinators(exportedNames, element.combinators);
            definedNames.addAll(exportedNames);
          }
        }
        _addAllFromNamespace(definedNames,
  