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diff --git a/src/google/protobuf/unknown_enum_test.proto b/src/google/protobuf/unknown_enum_test.proto
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Definitions of protos for testing cross-version compatibility.  The
+// UpRevision message acts as if it were a newer version of the DownRevision
+// message.  That is, UpRevision shares all the same fields as DownRevision,
+// but UpRevision can add fields and add enum values.
+syntax = "proto2";
+
+package google.protobuf.util;
+
+
+message DownRevision {
+  enum Enum {
+    DEFAULT_VALUE = 2;
+    NONDEFAULT_VALUE = 3;
+  }
+
+  optional Enum value = 1 [default = DEFAULT_VALUE];
+  repeated Enum values = 2;
+}
+
+message UpRevision {
+  enum Enum {
+    DEFAULT_VALUE = 2;
+    NONDEFAULT_VALUE = 3;
+    NEW_VALUE = 4;
+    NEW_VALUE_2 = 5;
+    NEW_VALUE_3 = 6;
+  }
+
+  optional Enum value = 1 [default = DEFAULT_VALUE];
+  repeated Enum values = 2;
+}