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: base.rb
    path of file: ./repos/truffleruby/lib/gems/gems/rss-0.2.9/lib/rss/maker
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require 'forwardable'

require_relative '../rss'

modu
    
      def set_default_values(&block)
        return yield if @default_values_are_set

        begin
          @default_values_are_set = true
          _set_default_values(&block)
        ensure
          @default_values_are_set = false
        end