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: vendored_persistent.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/lib/bundler
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Bundler
  module Persistent
    module Net
      module HTTP
      end
    end
  end
end
require_relative "vendor/net-http-persistent/lib/net/http/persistent"

module Bundler
  class PersistentHTTP < Persistent::Net::HTTP::Persistent
    def connection_for(uri)
      super(uri) do |connection|
        result = yield connection
        warn_old_tls_version_rubygems_connection(uri, connection)
        result
      end
    end

    def warn_old_tls_version_rubygems_connection(uri, connection)
      return unless connection.http.use_ssl?
      return unless (uri.host || "").end_with?("rubygems.org")

      s
    
    def warn_old_tls_version_rubygems_connection(uri, connection)
      return unless connection.http.use_ssl?
      return unless (uri.host || "").end_with?("rubygems.org")

      socket = connection.instance_variable_get(:@socket)
      return unless socket
      socket_io = socket.io
      return unless socket_io.respond_to?(:ssl_version)
      ssl_version = socket_io.ssl_version

      case ssl_version
      when /TLSv([\d\.]+)/
        version = Gem::Version.new($1)
        if version < Gem::Version.new("1.2")
          Bundler.ui.warn \
            "Warning: Your Ruby version is compiled against a copy of OpenSSL that is very old. " \
            "Starting in January 2018, RubyGems.org will refuse connection requests from these " \
            "very old versions of OpenSSL. If you will need to continue installing gems after " \
            "January 2018, please follow this guide to upgrade: http://ruby.to/tls-outdated.",
            :wrap => true
        end