src/third_party/protobuf/src/google/protobuf/unittest_preserve_unknown_enum.proto

// Protocol Buffers - Google's data interchange format
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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;
  }
}