support class native clause

pkg/front_end/lib/src/fasta/fasta_codes_generated.dart

 // Copyright (c) 2017, 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.
 
 // NOTE: THIS FILE IS GENERATED. DO NOT EDIT.
 //
 // Instead modify 'pkg/front_end/messages.yaml' and run
 // 'pkg/front_end/tool/_fasta/generate_messages.dart' to update.
 
 part of fasta.codes;
@@ skipping 1895 matching lines @@
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Code<Null> codeNamedFunctionExpression = messageNamedFunctionExpression;
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const MessageCode messageNamedFunctionExpression = const MessageCode(
     "NamedFunctionExpression",
     dart2jsCode: "*ignored*",
     message: r"""A function expression can't have a name.""");
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Null> codeNativeClauseShouldBeAnnotation =
+    messageNativeClauseShouldBeAnnotation;
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const MessageCode messageNativeClauseShouldBeAnnotation = const MessageCode(
+    "NativeClauseShouldBeAnnotation",
+    analyzerCode: "NATIVE_CLAUSE_SHOULD_BE_ANNOTATION",
+    dart2jsCode: "*fatal*",
+    message: r"""Native clause in this form is deprecated.""",
+    tip:
+        r"""Try removing this native clause and adding @native() or @native('native-name') before the declaration.""");
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Template<
     Message Function(Token token)> templateNoFormals = const Template<
         Message Function(Token token)>(
     messageTemplate: r"""A function should have formal parameters.""",
     tipTemplate:
         r"""Try adding '()' after '#lexeme', or add 'get' before '#lexeme' to declare a getter.""",
     withArguments: _withArgumentsNoFormals);
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Code<Message Function(Token token)> codeNoFormals =
@@ skipping 1158 matching lines @@
         r"""'yield' can't be used as an identifier in 'async', 'async*', or 'sync*' methods.""");
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Code<Null> codeYieldNotGenerator = messageYieldNotGenerator;
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const MessageCode messageYieldNotGenerator = const MessageCode(
     "YieldNotGenerator",
     dart2jsCode: "*ignored*",
     message: r"""'yield' can only be used in 'sync*' or 'async*' methods.""");