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: magic-file.rb
    path of file: ./repos/ruby-packer/ruby/lib/irb
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
module IRB
  class << (MagicFile = Object.new)
    # see parser_magic_comment in parse.y
    ENCODING_SPEC_RE = %r"coding\s*[=:]\s*([[:alnum:]\-_]+)"

    def open(path)
      io = File.open(path, 'rb')
      line = io.gets
      line = io.gets if line[0,2] == "#!"
      encoding = detect_encoding(line)
 
    
    def open(path)
      io = File.open(path, 'rb')
      line = io.gets
      line = io.gets if line[0,2] == "#!"
      encoding = detect_encoding(line)
      internal_encoding = encoding
      encoding ||= IRB.default_src_encoding
      io.rewind
      io.set_encoding(encoding, internal_encoding)

      if block_given?
        begin
          return (yield io)
        ensure
          io.close
        end