support class native clause

pkg/analyzer/lib/error/error.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.error.error;
 
 import 'dart:collection';
 
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart' show ScannerErrorCode;
@@ skipping 410 matching lines @@
   ParserErrorCode.MULTIPLE_LIBRARY_DIRECTIVES,
   ParserErrorCode.MULTIPLE_NAMED_PARAMETER_GROUPS,
   ParserErrorCode.MULTIPLE_PART_OF_DIRECTIVES,
   ParserErrorCode.MULTIPLE_POSITIONAL_PARAMETER_GROUPS,
   ParserErrorCode.MULTIPLE_VARIABLES_IN_FOR_EACH,
   ParserErrorCode.MULTIPLE_WITH_CLAUSES,
   ParserErrorCode.NAMED_FUNCTION_EXPRESSION,
   ParserErrorCode.NAMED_FUNCTION_TYPE,
   ParserErrorCode.NAMED_PARAMETER_OUTSIDE_GROUP,
   ParserErrorCode.NATIVE_CLAUSE_IN_NON_SDK_CODE,
+  ParserErrorCode.NATIVE_CLAUSE_SHOULD_BE_ANNOTATION,
   ParserErrorCode.NATIVE_FUNCTION_BODY_IN_NON_SDK_CODE,
   ParserErrorCode.NON_CONSTRUCTOR_FACTORY,
   ParserErrorCode.NON_IDENTIFIER_LIBRARY_NAME,
   ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART,
   ParserErrorCode.NON_STRING_LITERAL_AS_URI,
   ParserErrorCode.NON_USER_DEFINABLE_OPERATOR,
   ParserErrorCode.NORMAL_BEFORE_OPTIONAL_PARAMETERS,
   ParserErrorCode.NULLABLE_TYPE_IN_EXTENDS,
   ParserErrorCode.NULLABLE_TYPE_IN_IMPLEMENTS,
   ParserErrorCode.NULLABLE_TYPE_IN_WITH,
@@ skipping 407 matching lines @@
    * a single list of errors.
    */
   static List<AnalysisError> mergeLists(List<List<AnalysisError>> errorLists) {
     Set<AnalysisError> errors = new HashSet<AnalysisError>();
     for (List<AnalysisError> errorList in errorLists) {
       errors.addAll(errorList);
     }
     return errors.toList();
   }
 }