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: test_drbobject.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/drb
    
    the code of the file until where you have to start completion: require 'test/unit'
requi
    
  def teardown
    super
    # stop DRb::TimerIdConv::TimerHolder2#on_gc
    @idconv.instance_eval do
      @holder.instance_eval do
        @expires = nil
      end
    end
    GC.start
  end