/usr/lib/ruby/vendor_ruby/charlock_holmes.rb is in ruby-charlock-holmes 0.7.3+dfsg-2build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | require 'charlock_holmes/charlock_holmes'
require 'charlock_holmes/encoding_detector'
require 'charlock_holmes/version' unless defined? CharlockHolmes::VERSION
# require this if you want the String monkey patches
# require 'charlock_holmes/string'
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