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diff --git a/third_party/protobuf/3.6.0/src/google/protobuf/unittest_preserve_unknown_enum.proto b/third_party/protobuf/3.6.0/src/google/protobuf/unittest_preserve_unknown_enum.proto
new file mode 100644
index 0000000000..2f91332c9e
--- /dev/null
+++ b/third_party/protobuf/3.6.0/src/google/protobuf/unittest_preserve_unknown_enum.proto
@@ -0,0 +1,71 @@
+// 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.
+
+syntax = "proto3";
+
+package proto3_preserve_unknown_enum_unittest;
+option objc_class_prefix = "UnknownEnums";
+
+option csharp_namespace = "Google.Protobuf.TestProtos";
+
+enum MyEnum {
+  FOO = 0;
+  BAR = 1;
+  BAZ = 2;
+}
+
+enum MyEnumPlusExtra {
+  E_FOO = 0;
+  E_BAR = 1;
+  E_BAZ = 2;
+  E_EXTRA = 3;
+}
+
+message MyMessage {
+  MyEnum e = 1;
+  repeated MyEnum repeated_e = 2;
+  repeated MyEnum repeated_packed_e = 3 [packed=true];
+  repeated MyEnumPlusExtra repeated_packed_unexpected_e = 4;  // not packed
+  oneof o {
+    MyEnum oneof_e_1 = 5;
+    MyEnum oneof_e_2 = 6;
+  }
+}
+
+message MyMessagePlusExtra {
+  MyEnumPlusExtra e = 1;
+  repeated MyEnumPlusExtra repeated_e = 2;
+  repeated MyEnumPlusExtra repeated_packed_e = 3 [packed=true];
+  repeated MyEnumPlusExtra repeated_packed_unexpected_e = 4 [packed=true];
+  oneof o {
+    MyEnumPlusExtra oneof_e_1 = 5;
+    MyEnumPlusExtra oneof_e_2 = 6;
+  }
+}