/usr/lib/ruby/ is in ruby-hashie 2.0.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/hashie.rb
/usr/lib/ruby/vendor_ruby/hashie/
/usr/lib/ruby/vendor_ruby/hashie/extensions/
/usr/lib/ruby/vendor_ruby/hashie/extensions/indifferent_access.rb
/usr/lib/ruby/vendor_ruby/hashie/extensions/structure.rb
/usr/lib/ruby/vendor_ruby/hashie/extensions/key_conversion.rb
/usr/lib/ruby/vendor_ruby/hashie/extensions/coercion.rb
/usr/lib/ruby/vendor_ruby/hashie/extensions/deep_merge.rb
/usr/lib/ruby/vendor_ruby/hashie/extensions/merge_initializer.rb
/usr/lib/ruby/vendor_ruby/hashie/extensions/method_access.rb
/usr/lib/ruby/vendor_ruby/hashie/dash.rb
/usr/lib/ruby/vendor_ruby/hashie/mash.rb
/usr/lib/ruby/vendor_ruby/hashie/version.rb
/usr/lib/ruby/vendor_ruby/hashie/hash.rb
/usr/lib/ruby/vendor_ruby/hashie/hash_extensions.rb
/usr/lib/ruby/vendor_ruby/hashie/clash.rb
/usr/lib/ruby/vendor_ruby/hashie/trash.rb