protobuf/upb/test/proto3_test.proto

// Protocol Buffers - Google's data interchange format
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syntax = "proto3";

package upb.test;

import "google/protobuf/descriptor.proto";

extend google.protobuf.MessageOptions {
  optional string my_option = 51235;
}

message MyMessage3 {
  option (my_option) = "Hello world!";
}

message TestMessage3 {
  optional int32 i32 = 1;
  repeated int32 r_i32 = 2;
  optional string str = 3;
  repeated string r_str = 4;
  optional TestMessage3 msg = 5;
  repeated TestMessage3 r_msg = 6;
}