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diff --git a/src/google/protobuf/unittest.proto b/src/google/protobuf/unittest.proto
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.
+// http://code.google.com/p/protobuf/
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// A proto file we will use for unit testing.
+
+
+import "google/protobuf/unittest_import.proto";
+
+// We don't put this in a package within proto2 because we need to make sure
+// that the generated code doesn't depend on being in the proto2 namespace.
+// In test_util.h we do "using namespace unittest = protobuf_unittest".
+package protobuf_unittest;
+
+// Protos optimized for SPEED use a strict superset of the generated code
+// of equivalent ones optimized for CODE_SIZE, so we should optimize all our
+// tests for speed unless explicitly testing code size optimization.
+option optimize_for = SPEED;
+
+option java_outer_classname = "UnittestProto";
+
+// This proto includes every type of field in both singular and repeated
+// forms.
+message TestAllTypes {
+  message NestedMessage {
+    // The field name "b" fails to compile in proto1 because it conflicts with
+    // a local variable named "b" in one of the generated methods.  Doh.
+    // This file needs to compile in proto1 to test backwards-compatibility.
+    optional int32 bb = 1;
+  }
+
+  enum NestedEnum {
+    FOO = 1;
+    BAR = 2;
+    BAZ = 3;
+  }
+
+  // Singular
+  optional    int32 optional_int32    =  1;
+  optional    int64 optional_int64    =  2;
+  optional   uint32 optional_uint32   =  3;
+  optional   uint64 optional_uint64   =  4;
+  optional   sint32 optional_sint32   =  5;
+  optional   sint64 optional_sint64   =  6;
+  optional  fixed32 optional_fixed32  =  7;
+  optional  fixed64 optional_fixed64  =  8;
+  optional sfixed32 optional_sfixed32 =  9;
+  optional sfixed64 optional_sfixed64 = 10;
+  optional    float optional_float    = 11;
+  optional   double optional_double   = 12;
+  optional     bool optional_bool     = 13;
+  optional   string optional_string   = 14;
+  optional    bytes optional_bytes    = 15;
+
+  optional group OptionalGroup = 16 {
+    optional int32 a = 17;
+  }
+
+  optional NestedMessage                        optional_nested_message  = 18;
+  optional ForeignMessage                       optional_foreign_message = 19;
+  optional protobuf_unittest_import.ImportMessage optional_import_message  = 20;
+
+  optional NestedEnum                           optional_nested_enum     = 21;
+  optional ForeignEnum                          optional_foreign_enum    = 22;
+  optional protobuf_unittest_import.ImportEnum    optional_import_enum     = 23;
+
+  optional string optional_string_piece = 24 [ctype=STRING_PIECE];
+  optional string optional_cord = 25 [ctype=CORD];
+
+  // Repeated
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated group RepeatedGroup = 46 {
+    optional int32 a = 47;
+  }
+
+  repeated NestedMessage                        repeated_nested_message  = 48;
+  repeated ForeignMessage                       repeated_foreign_message = 49;
+  repeated protobuf_unittest_import.ImportMessage repeated_import_message  = 50;
+
+  repeated NestedEnum                           repeated_nested_enum     = 51;
+  repeated ForeignEnum                          repeated_foreign_enum    = 52;
+  repeated protobuf_unittest_import.ImportEnum    repeated_import_enum     = 53;
+
+  repeated string repeated_string_piece = 54 [ctype=STRING_PIECE];
+  repeated string repeated_cord = 55 [ctype=CORD];
+
+  // Singular with defaults
+  optional    int32 default_int32    = 61 [default =  41    ];
+  optional    int64 default_int64    = 62 [default =  42    ];
+  optional   uint32 default_uint32   = 63 [default =  43    ];
+  optional   uint64 default_uint64   = 64 [default =  44    ];
+  optional   sint32 default_sint32   = 65 [default = -45    ];
+  optional   sint64 default_sint64   = 66 [default =  46    ];
+  optional  fixed32 default_fixed32  = 67 [default =  47    ];
+  optional  fixed64 default_fixed64  = 68 [default =  48    ];
+  optional sfixed32 default_sfixed32 = 69 [default =  49    ];
+  optional sfixed64 default_sfixed64 = 70 [default = -50    ];
+  optional    float default_float    = 71 [default =  51.5  ];
+  optional   double default_double   = 72 [default =  52e3  ];
+  optional     bool default_bool     = 73 [default = true   ];
+  optional   string default_string   = 74 [default = "hello"];
+  optional    bytes default_bytes    = 75 [default = "world"];
+
+  optional NestedEnum  default_nested_enum  = 81 [default = BAR        ];
+  optional ForeignEnum default_foreign_enum = 82 [default = FOREIGN_BAR];
+  optional protobuf_unittest_import.ImportEnum
+      default_import_enum = 83 [default = IMPORT_BAR];
+
+  optional string default_string_piece = 84 [ctype=STRING_PIECE,default="abc"];
+  optional string default_cord = 85 [ctype=CORD,default="123"];
+}
+
+// Define these after TestAllTypes to make sure the compiler can handle
+// that.
+message ForeignMessage {
+  optional int32 c = 1;
+}
+
+enum ForeignEnum {
+  FOREIGN_FOO = 4;
+  FOREIGN_BAR = 5;
+  FOREIGN_BAZ = 6;
+}
+
+message TestAllExtensions {
+  extensions 1 to max;
+}
+
+extend TestAllExtensions {
+  // Singular
+  optional    int32 optional_int32_extension    =  1;
+  optional    int64 optional_int64_extension    =  2;
+  optional   uint32 optional_uint32_extension   =  3;
+  optional   uint64 optional_uint64_extension   =  4;
+  optional   sint32 optional_sint32_extension   =  5;
+  optional   sint64 optional_sint64_extension   =  6;
+  optional  fixed32 optional_fixed32_extension  =  7;
+  optional  fixed64 optional_fixed64_extension  =  8;
+  optional sfixed32 optional_sfixed32_extension =  9;
+  optional sfixed64 optional_sfixed64_extension = 10;
+  optional    float optional_float_extension    = 11;
+  optional   double optional_double_extension   = 12;
+  optional     bool optional_bool_extension     = 13;
+  optional   string optional_string_extension   = 14;
+  optional    bytes optional_bytes_extension    = 15;
+
+  optional group OptionalGroup_extension = 16 {
+    optional int32 a = 17;
+  }
+
+  optional TestAllTypes.NestedMessage optional_nested_message_extension = 18;
+  optional ForeignMessage optional_foreign_message_extension = 19;
+  optional protobuf_unittest_import.ImportMessage
+    optional_import_message_extension = 20;
+
+  optional TestAllTypes.NestedEnum optional_nested_enum_extension = 21;
+  optional ForeignEnum optional_foreign_enum_extension = 22;
+  optional protobuf_unittest_import.ImportEnum
+    optional_import_enum_extension = 23;
+
+  optional string optional_string_piece_extension = 24 [ctype=STRING_PIECE];
+  optional string optional_cord_extension = 25 [ctype=CORD];
+
+  // Repeated
+  repeated    int32 repeated_int32_extension    = 31;
+  repeated    int64 repeated_int64_extension    = 32;
+  repeated   uint32 repeated_uint32_extension   = 33;
+  repeated   uint64 repeated_uint64_extension   = 34;
+  repeated   sint32 repeated_sint32_extension   = 35;
+  repeated   sint64 repeated_sint64_extension   = 36;
+  repeated  fixed32 repeated_fixed32_extension  = 37;
+  repeated  fixed64 repeated_fixed64_extension  = 38;
+  repeated sfixed32 repeated_sfixed32_extension = 39;
+  repeated sfixed64 repeated_sfixed64_extension = 40;
+  repeated    float repeated_float_extension    = 41;
+  repeated   double repeated_double_extension   = 42;
+  repeated     bool repeated_bool_extension     = 43;
+  repeated   string repeated_string_extension   = 44;
+  repeated    bytes repeated_bytes_extension    = 45;
+
+  repeated group RepeatedGroup_extension = 46 {
+    optional int32 a = 47;
+  }
+
+  repeated TestAllTypes.NestedMessage repeated_nested_message_extension = 48;
+  repeated ForeignMessage repeated_foreign_message_extension = 49;
+  repeated protobuf_unittest_import.ImportMessage
+    repeated_import_message_extension = 50;
+
+  repeated TestAllTypes.NestedEnum repeated_nested_enum_extension = 51;
+  repeated ForeignEnum repeated_foreign_enum_extension = 52;
+  repeated protobuf_unittest_import.ImportEnum
+    repeated_import_enum_extension = 53;
+
+  repeated string repeated_string_piece_extension = 54 [ctype=STRING_PIECE];
+  repeated string repeated_cord_extension = 55 [ctype=CORD];
+
+  // Singular with defaults
+  optional    int32 default_int32_extension    = 61 [default =  41    ];
+  optional    int64 default_int64_extension    = 62 [default =  42    ];
+  optional   uint32 default_uint32_extension   = 63 [default =  43    ];
+  optional   uint64 default_uint64_extension   = 64 [default =  44    ];
+  optional   sint32 default_sint32_extension   = 65 [default = -45    ];
+  optional   sint64 default_sint64_extension   = 66 [default =  46    ];
+  optional  fixed32 default_fixed32_extension  = 67 [default =  47    ];
+  optional  fixed64 default_fixed64_extension  = 68 [default =  48    ];
+  optional sfixed32 default_sfixed32_extension = 69 [default =  49    ];
+  optional sfixed64 default_sfixed64_extension = 70 [default = -50    ];
+  optional    float default_float_extension    = 71 [default =  51.5  ];
+  optional   double default_double_extension   = 72 [default =  52e3  ];
+  optional     bool default_bool_extension     = 73 [default = true   ];
+  optional   string default_string_extension   = 74 [default = "hello"];
+  optional    bytes default_bytes_extension    = 75 [default = "world"];
+
+  optional TestAllTypes.NestedEnum
+    default_nested_enum_extension = 81 [default = BAR];
+  optional ForeignEnum
+    default_foreign_enum_extension = 82 [default = FOREIGN_BAR];
+  optional protobuf_unittest_import.ImportEnum
+    default_import_enum_extension = 83 [default = IMPORT_BAR];
+
+  optional string default_string_piece_extension = 84 [ctype=STRING_PIECE,
+                                                       default="abc"];
+  optional string default_cord_extension = 85 [ctype=CORD, default="123"];
+}
+
+// We have separate messages for testing required fields because it's
+// annoying to have to fill in required fields in TestProto in order to
+// do anything with it.  Note that we don't need to test every type of
+// required filed because the code output is basically identical to
+// optional fields for all types.
+message TestRequired {
+  required int32 a = 1;
+  optional int32 dummy2 = 2;
+  required int32 b = 3;
+
+  extend TestAllExtensions {
+    optional TestRequired single = 1000;
+    repeated TestRequired multi  = 1001;
+  }
+
+  // Pad the field count to 32 so that we can test that IsInitialized()
+  // properly checks multiple elements of has_bits_.
+  optional int32 dummy4  =  4;
+  optional int32 dummy5  =  5;
+  optional int32 dummy6  =  6;
+  optional int32 dummy7  =  7;
+  optional int32 dummy8  =  8;
+  optional int32 dummy9  =  9;
+  optional int32 dummy10 = 10;
+  optional int32 dummy11 = 11;
+  optional int32 dummy12 = 12;
+  optional int32 dummy13 = 13;
+  optional int32 dummy14 = 14;
+  optional int32 dummy15 = 15;
+  optional int32 dummy16 = 16;
+  optional int32 dummy17 = 17;
+  optional int32 dummy18 = 18;
+  optional int32 dummy19 = 19;
+  optional int32 dummy20 = 20;
+  optional int32 dummy21 = 21;
+  optional int32 dummy22 = 22;
+  optional int32 dummy23 = 23;
+  optional int32 dummy24 = 24;
+  optional int32 dummy25 = 25;
+  optional int32 dummy26 = 26;
+  optional int32 dummy27 = 27;
+  optional int32 dummy28 = 28;
+  optional int32 dummy29 = 29;
+  optional int32 dummy30 = 30;
+  optional int32 dummy31 = 31;
+  optional int32 dummy32 = 32;
+
+  required int32 c = 33;
+}
+
+message TestRequiredForeign {
+  optional TestRequired optional_message = 1;
+  repeated TestRequired repeated_message = 2;
+  optional int32 dummy = 3;
+}
+
+// Test that we can use NestedMessage from outside TestAllTypes.
+message TestForeignNested {
+  optional TestAllTypes.NestedMessage foreign_nested = 1;
+}
+
+// TestEmptyMessage is used to test unknown field support.
+message TestEmptyMessage {
+}
+
+// Like above, but declare all field numbers as potential extensions.  No
+// actual extensions should ever be defined for this type.
+message TestEmptyMessageWithExtensions {
+  extensions 1 to max;
+}
+
+// Test that really large tag numbers don't break anything.
+message TestReallyLargeTagNumber {
+  // The largest possible tag number is 2^28 - 1, since the wire format uses
+  // three bits to communicate wire type.
+  optional int32 a = 1;
+  optional int32 bb = 268435455;
+}
+
+message TestRecursiveMessage {
+  optional TestRecursiveMessage a = 1;
+  optional int32 i = 2;
+}
+
+// Test that mutual recursion works.
+message TestMutualRecursionA {
+  optional TestMutualRecursionB bb = 1;
+}
+
+message TestMutualRecursionB {
+  optional TestMutualRecursionA a = 1;
+  optional int32 optional_int32 = 2;
+}
+
+// Test that groups have disjoint field numbers from their siblings and
+// parents.  This is NOT possible in proto1; only proto2.  When outputting
+// proto1, the dup fields should be dropped.
+message TestDupFieldNumber {
+  optional int32 a = 1;
+  optional group Foo = 2 { optional int32 a = 1; }
+  optional group Bar = 3 { optional int32 a = 1; }
+}
+
+
+// Needed for a Python test.
+message TestNestedMessageHasBits {
+  message NestedMessage {
+    repeated int32 nestedmessage_repeated_int32 = 1;
+    repeated ForeignMessage nestedmessage_repeated_foreignmessage = 2;
+  }
+  optional NestedMessage optional_nested_message = 1;
+}
+
+
+// Test an enum that has multiple values with the same number.
+enum TestEnumWithDupValue {
+  FOO1 = 1;
+  BAR1 = 2;
+  BAZ = 3;
+  FOO2 = 1;
+  BAR2 = 2;
+}
+
+// Test an enum with large, unordered values.
+enum TestSparseEnum {
+  SPARSE_A = 123;
+  SPARSE_B = 62374;
+  SPARSE_C = 12589234;
+  SPARSE_D = -15;
+  SPARSE_E = -53452;
+  SPARSE_F = 0;
+  SPARSE_G = 2;
+}
+
+// Test message with CamelCase field names.  This violates Protocol Buffer
+// standard style.
+message TestCamelCaseFieldNames {
+  optional int32 PrimitiveField = 1;
+  optional string StringField = 2;
+  optional ForeignEnum EnumField = 3;
+  optional ForeignMessage MessageField = 4;
+  optional string StringPieceField = 5 [ctype=STRING_PIECE];
+  optional string CordField = 6 [ctype=CORD];
+
+  repeated int32 RepeatedPrimitiveField = 7;
+  repeated string RepeatedStringField = 8;
+  repeated ForeignEnum RepeatedEnumField = 9;
+  repeated ForeignMessage RepeatedMessageField = 10;
+  repeated string RepeatedStringPieceField = 11 [ctype=STRING_PIECE];
+  repeated string RepeatedCordField = 12 [ctype=CORD];
+}
+
+
+// We list fields out of order, to ensure that we're using field number and not
+// field index to determine serialization order.
+message TestFieldOrderings {
+  optional string my_string = 11;
+  extensions 2 to 10;
+  optional int64 my_int = 1;
+  extensions 12 to 100;
+  optional float my_float = 101;
+}
+
+
+extend TestFieldOrderings {
+  optional string my_extension_string = 50;
+  optional int32 my_extension_int = 5;
+}
+
+
+message TestExtremeDefaultValues {
+  optional bytes escaped_bytes = 1 [default = "\0\001\a\b\f\n\r\t\v\\\'\"\xfe"];
+  optional uint32 large_uint32 = 2 [default = 0xFFFFFFFF];
+  optional uint64 large_uint64 = 3 [default = 0xFFFFFFFFFFFFFFFF];
+  optional  int32 small_int32  = 4 [default = -0x7FFFFFFF];
+  optional  int64 small_int64  = 5 [default = -0x7FFFFFFFFFFFFFFF];
+
+  // The default value here is UTF-8 for "\u1234".  (We could also just type
+  // the UTF-8 text directly into this text file rather than escape it, but
+  // lots of people use editors that would be confused by this.)
+  optional string utf8_string = 6 [default = "\341\210\264"];
+}
+
+// Test that RPC services work.
+message FooRequest  {}
+message FooResponse {}
+
+service TestService {
+  rpc Foo(FooRequest) returns (FooResponse);
+  rpc Bar(BarRequest) returns (BarResponse);
+}
+
+
+message BarRequest  {}
+message BarResponse {}