/usr/share/doc/ruby-eventmachine/examples/old/helper.rb is in ruby-eventmachine 1.0.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | $:.unshift File.expand_path(File.dirname(__FILE__) + '/../lib')
require 'eventmachine'
|