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: mspec.rb
    path of file: ./repos/ruby-packer/ruby/spec/mspec/lib/mspec/runner
    
    the code of the file until where you have to start completion: require 'mspec/runner/context
    
  def self.each_file(&block)
    if ENV["MSPEC_MULTI"]
      while file = STDIN.gets
        file = file.chomp
        return if file == "QUIT"
        yield file
        begin
          STDOUT.print "."
          STDOUT.flush
        rescue Errno::EPIPE
          # The parent died
          exit 1
        end