lint/test/linters/protobuf/protobuf_good_1.proto

syntax = "proto3";
import public "other.proto";
option java_package = "com.example.foo";
enum EnumAllowingAlias {
  option allow_alias = true;
  ENUM_ALLOWING_ALIAS_ALLOWING_UNSPECIFIED = 0;
  ENUM_ALLOWING_ALIAS_STARTED = 1;
  ENUM_ALLOWING_ALIAS_RUNNING = 2 [(custom_option) = "hello world"];
}
message Outer {
  option (my_option).a = true;
  message Inner {   // Level 2
    int64 ival = 1;
  }
  inner inner_message = 2;
  EnumAllowingAlias enum_field =3;
  map<int32, string> my_map = 4;
}