anchor.diff:      int i = 0;
       for (int j = 0; j < numOfRequiredParameters; j++, i++) {
         ParameterElementImpl parameter = new ParameterElementImpl("", 0);
  -      parameter.type = dynamicType;
  +      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 = dynamicType;
  +      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 = dynamicType;
  +      parameter.type = bottomType;
         parameter.parameterKind = ParameterKind.NAMED;
         parameters[i] = parameter;
       }
  
positive.code:               // Tests: test_getMapOfMembersInheritedFromInterfaces_
                // union_multipleSubtypes_*
                //
                List<ExecutableElement> elementArrayToMerge =
                    new List<ExecutableElement>(
                        subtypesOfAllOtherTypesIndexes.length);
  
negative.code:    * @param namedParameters the list of [String]s that are the named parameters
     * @return the created synthetic element
     */
    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;
  