chromium/third_party/protobuf/ruby/tests/multi_level_nesting_test.proto

syntax = "proto3";

message Function {
  string name = 1;
  repeated Function.Parameter parameters = 2;
  string return_type = 3;

  message Parameter {
    string name = 1;
    Function.Parameter.Value value = 2;

    message Value {
      oneof type {
        string string = 1;
        int64 integer = 2;
      }
    }
  }
}