anchor.diff:     * @param namedParameters the list of [String]s that are the named parameters
      * @return the created synthetic element
      */
  -  static ExecutableElement _createSyntheticExecutableElement(
  +  ExecutableElement _createSyntheticExecutableElement(
         List<ExecutableElement> elementArrayToMerge,
         String name,
         int numOfRequiredParameters,
         int numOfPositionalParameters,
         List<String> namedParameters) {
       DynamicTypeImpl dynamicType = DynamicTypeImpl.instance;
  +    DartType bottomType = _library.context.analysisOptions.strongMode
  +        ? BottomTypeImpl.instance
  +        : dynamicType;
       SimpleIdentifier nameIdentifier = astFactory
           .simpleIdentifier(new StringToken(TokenType.IDENTIFIER, name, 0));
       ExecutableElementImpl executable;
  
positive.code:               // Tests: test_getMapOfMembersInheritedFromInterfaces_
                // union_multipleSubtypes_*
                //
                List<ExecutableElement> elementArrayToMerge =
                    new List<ExecutableElement>(
                        subtypesOfAllOtherTypesIndexes.length);
  
negative.code:     int i = 0;
      for (int j = 0; j < numOfRequiredParameters; j++, i++) {
        ParameterElementImpl parameter = new ParameterElementImpl("", 0);
        parameter.type = bottomType;
        parameter.parameterKind = ParameterKind.REQUIRED;
        parameters[i] = parameter;
      }
      for (int k = 0; k < numOfPositionalParameters; k++, i++) {
        ParameterElementImpl parameter = new ParameterElementImpl("", 0);
        parameter.type = bottomType;
        parameter.parameterKind = ParameterKind.POSITIONAL;
        parameters[i] = parameter;
      }
      for (int m = 0; m < namedParameters.length; m++, i++) {
        ParameterElementImpl parameter =
            new ParameterElementImpl(namedParameters[m], 0);
        parameter.type = bottomType;
        parameter.parameterKind = ParameterKind.NAMED;
        parameters[i] = parameter;
      }
  