support class native clause

pkg/analyzer/test/generated/parser_test.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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
 import 'package:analyzer/src/dart/error/hint_codes.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
+import 'package:analyzer/src/fasta/ast_builder.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/testing/token_factory.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:front_end/src/scanner/scanner.dart' as fe;
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'test_support.dart';
 
@@ skipping 13777 matching lines @@
       expect(annotation.constructorName.name, 'bar');
       expect(annotation.arguments, isNotNull);
       expect(annotation.arguments.arguments, hasLength(2));
     }
   }
 
   void test_parseClassDeclaration_native() {
     createParser('class A native "nativeValue" {}');
     CompilationUnitMember member = parseFullCompilationUnitMember();
     expect(member, isNotNull);
-    assertNoErrors();
+    if (usingFastaParser && !AstBuilder.isNativeClauseAllowed) {
+      assertErrorsWithCodes([
+        ParserErrorCode.NATIVE_CLAUSE_SHOULD_BE_ANNOTATION,
+      ]);
+    } else {
+      assertNoErrors();
+    }
     expect(member, new isInstanceOf<ClassDeclaration>());
     ClassDeclaration declaration = member;
     NativeClause nativeClause = declaration.nativeClause;
     expect(nativeClause, isNotNull);
     expect(nativeClause.nativeKeyword, isNotNull);
     expect(nativeClause.name.stringValue, "nativeValue");
     expect(nativeClause.beginToken, same(nativeClause.nativeKeyword));
     expect(nativeClause.endToken, same(nativeClause.name.endToken));
   }
 
@@ skipping 1610 matching lines @@
     expectCommentText(typeVariable.documentationComment, '/// Doc');
   }
 
   /**
    * Assert that the given [name] is in declaration context.
    */
   void _assertIsDeclarationName(SimpleIdentifier name) {
     expect(name.inDeclarationContext(), isTrue);
   }
 }