support class native clause

pkg/analyzer/test/generated/parser_test.dart

Index: pkg/analyzer/test/generated/parser_test.dart
diff --git a/pkg/analyzer/test/generated/parser_test.dart b/pkg/analyzer/test/generated/parser_test.dart
index 6eb0bfcf606957c62c5723a373c97397b4b9e7e6..86c8e3fc06fe33b1c25026d36952f765ca146c5e 100644
--- a/pkg/analyzer/test/generated/parser_test.dart
+++ b/pkg/analyzer/test/generated/parser_test.dart
@@ -12,6 +12,7 @@ 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';
@@ -13809,7 +13810,13 @@ abstract class TopLevelParserTestMixin implements AbstractParserTestCase {
     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;