// 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.

syntax = "proto2";

package pkg1;

message M {
  message M {
    optional int32 x = 1;
  }
  optional int32 a = 1;
  optional string b = 2;
}