/usr/lib/ruby/vendor_ruby/ is in ruby-awesome-print 1.6.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/ap.rb
/usr/lib/ruby/vendor_ruby/awesome_print.rb
/usr/lib/ruby/vendor_ruby/awesome_print/
/usr/lib/ruby/vendor_ruby/awesome_print/formatter.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/
/usr/lib/ruby/vendor_ruby/awesome_print/ext/mongo_mapper.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/mongoid.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/ripple.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/ostruct.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/no_brainer.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/action_view.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/nokogiri.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/active_record.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/active_support.rb
/usr/lib/ruby/vendor_ruby/awesome_print/ext/sequel.rb
/usr/lib/ruby/vendor_ruby/awesome_print/core_ext/
/usr/lib/ruby/vendor_ruby/awesome_print/core_ext/logger.rb
/usr/lib/ruby/vendor_ruby/awesome_print/core_ext/method.rb
/usr/lib/ruby/vendor_ruby/awesome_print/core_ext/string.rb
/usr/lib/ruby/vendor_ruby/awesome_print/core_ext/object.rb
/usr/lib/ruby/vendor_ruby/awesome_print/core_ext/class.rb
/usr/lib/ruby/vendor_ruby/awesome_print/core_ext/kernel.rb
/usr/lib/ruby/vendor_ruby/awesome_print/core_ext/array.rb
/usr/lib/ruby/vendor_ruby/awesome_print/version.rb
/usr/lib/ruby/vendor_ruby/awesome_print/inspector.rb