You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rethinkdb.rb
    path of file: ./repos/homebrew-core/Formula/r
    
    the code of the file until where you have to start completion: class Rethinkdb < Formula
  desc "Open-source database for the realtime web"
  homepage "https://rethinkdb.com/"
  # TODO: Check if we can use unversioned `protobuf` at version bump
  # upstream issue report, https://github.com/rethinkdb/rethinkdb/issues/7142
  url "https://download.rethinkdb.com/repository/raw/dist/rethinkdb-2.4.4.tgz
    
  def install
    ENV.cxx11
    # Can use system Python 2 for older macOS. See https://rethinkdb.com/docs/build
    ENV["PYTHON"] = which("python3") if !OS.mac? || MacOS.version >= :catalina

    args = %W[
      --prefix=#{prefix}
      --sysconfdir=#{etc}
      --localstatedir=#{var}
    ]
    args << "--allow-fetch" if build.head?

    system "./configure", *args
    system "make"
    system "make", "install-binaries"

    (var/"log/rethinkdb").mkpath

    inreplace "packaging/assets/config/default.conf.sample",
              /^# directory=.*/, "directory=#{var}/rethinkdb"
    etc.install "packaging/assets/config/default.conf.sample" => "rethinkdb.conf"
  end