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: delegation.rb
    path of file: ./repos/casting/lib/casting
    
    the code of the file until where you have to start completion: module Casting
  class MissingAttendant < StandardError
    def message
      "You must set your attendant object using `to'."
    end
  e
    
    def delegated_method
      if Module === attendant
        attendant
      else
        attendant.method(delegated_method_name).owner
      end.instance_method(delegated_method_name)
    rescue NameError => e
      raise InvalidAttendant, e.message
    end