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: 1.0.rb
    path of file: ./repos/ruby-packer/ruby/lib/rss/maker
    
    the code of the file until where you have to start completion: # frozen_string_literal: fa
    
          def to_feed(rss)
            set_default_values do
              item = RDF::Item.new(link)
              set = setup_values(item)
              if set
                item.dc_dates.clear
                rss.items << item
                set_parent(item, rss)
                setup_other_elements(rss, item)
              elsif !have_required_values?
                raise NotSetError.new("maker.item", not_set_required_variables)
              end
            end