/usr/lib/ruby/vendor_ruby/rails/rack.rb is in ruby-railties 2:4.2.6-1.
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 7 | module Rails
module Rack
autoload :Debugger, "rails/rack/debugger" if RUBY_VERSION < '2.0.0'
autoload :Logger, "rails/rack/logger"
autoload :LogTailer, "rails/rack/log_tailer"
end
end
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