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: tar_reader.rb
    path of file: ./repos/ruby-packer/ruby/lib/rubygems/package
    
    the code of the file until where you have to start completion: # -*- coding: utf-8 -*-
# frozen_string
    
  def self.new(io)
    reader = super

    return reader unless block_given?

    begin
      yield reader
    ensure
      reader.close
    end