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diff --git a/third_party/protobuf/3.6.0/src/google/protobuf/util/internal/testdata/maps.proto b/third_party/protobuf/3.6.0/src/google/protobuf/util/internal/testdata/maps.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.
+
+syntax = "proto3";
+
+package google.protobuf.testing;
+
+// Top-level test cases proto used by MarshallingTest. See description
+// at the top of the class MarshallingTest for details on how to write
+// test cases.
+message MapsTestCases {
+  EmptyMap empty_map = 1;
+  StringtoInt string_to_int = 2;
+  IntToString int_to_string = 3;
+  Mixed1 mixed1 = 4;
+  Mixed2 mixed2 = 5;
+  MapOfObjects map_of_objects = 6;
+
+  // Empty key tests
+  StringtoInt empty_key_string_to_int1 = 7;
+  StringtoInt empty_key_string_to_int2 = 8;
+  StringtoInt empty_key_string_to_int3 = 9;
+  BoolToString empty_key_bool_to_string = 10;
+  IntToString empty_key_int_to_string = 11;
+  Mixed1 empty_key_mixed = 12;
+  MapOfObjects empty_key_map_objects = 13;
+}
+
+message EmptyMap {
+  map<int32, int32> map = 1;
+}
+
+message StringtoInt {
+  map<string, int32> map = 1;
+}
+
+message IntToString {
+  map<int32, string> map = 1;
+}
+
+message BoolToString {
+  map<bool, string> map = 1;
+}
+
+message Mixed1 {
+  string msg = 1;
+  map<string, float> map = 2;
+}
+
+message Mixed2 {
+  enum E {
+    E0 = 0;
+    E1 = 1;
+    E2 = 2;
+    E3 = 3;
+  }
+  map<int32, bool> map = 1;
+  E ee = 2;
+}
+
+message MapOfObjects {
+  message M {
+    string inner_text = 1;
+  }
+  map<string, M> map = 1;
+}
+
+message DummyRequest {
+}
+
+service MapsTestService {
+  rpc Call(DummyRequest) returns (MapsTestCases);
+}
+
+message MapIn {
+  string other = 1;
+  repeated string things = 2;
+  map<string, string> map_input = 3;
+}
+
+message MapOut {
+  map<string, MapM> map1 = 1;
+  map<string, MapOut> map2 = 2;
+  map<int32, string> map3 = 3;
+  map<bool, string> map4 = 5;
+  string bar = 4;
+}
+
+// A message with exactly the same wire representation as MapOut, but using
+// repeated message fields instead of map fields. We use this message to test
+// the wire-format compatibility of the JSON transcoder (e.g., whether it
+// handles missing keys correctly).
+message MapOutWireFormat {
+  message Map1Entry {
+    string key = 1;
+    MapM value = 2;
+  }
+  repeated Map1Entry map1 = 1;
+  message Map2Entry {
+    string key = 1;
+    MapOut value = 2;
+  }
+  repeated Map2Entry map2 = 2;
+  message Map3Entry {
+    int32 key = 1;
+    string value = 2;
+  }
+  repeated Map3Entry map3 = 3;
+  message Map4Entry {
+    bool key = 1;
+    string value = 2;
+  }
+  repeated Map4Entry map4 = 5;
+  string bar = 4;
+}
+
+message MapM {
+  string foo = 1;
+}