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: po_entry.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/rdoc-4.3.0/lib/rdoc/generator/pot
    
    the code of the file until where you have to start completion: ##
# A PO entry in PO

class RDoc::Generator::POT::POEntry

  # The msgid content
  attr_reader :msgid

  # The msgstr content
  attr_reader :msgstr

  # The comment content created 
    
  def to_s
    entry = ''
    entry << format_translator_comment
    entry << format_extracted_comment
    entry << format_references
    entry << format_flags
    entry << <<-ENTRY
msgid #{format_message(@msgid)}
msgstr #{format_message(@msgstr)}
    ENTRY
  end