/usr/lib/ruby/ is in ruby-temple 0.6.7-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/temple.rb
/usr/lib/ruby/vendor_ruby/temple/
/usr/lib/ruby/vendor_ruby/temple/html/
/usr/lib/ruby/vendor_ruby/temple/html/pretty.rb
/usr/lib/ruby/vendor_ruby/temple/html/fast.rb
/usr/lib/ruby/vendor_ruby/temple/html/filter.rb
/usr/lib/ruby/vendor_ruby/temple/html/attribute_merger.rb
/usr/lib/ruby/vendor_ruby/temple/html/attribute_sorter.rb
/usr/lib/ruby/vendor_ruby/temple/html/attribute_remover.rb
/usr/lib/ruby/vendor_ruby/temple/html/dispatcher.rb
/usr/lib/ruby/vendor_ruby/temple/grammar.rb
/usr/lib/ruby/vendor_ruby/temple/utils.rb
/usr/lib/ruby/vendor_ruby/temple/mixins/
/usr/lib/ruby/vendor_ruby/temple/mixins/grammar_dsl.rb
/usr/lib/ruby/vendor_ruby/temple/mixins/options.rb
/usr/lib/ruby/vendor_ruby/temple/mixins/engine_dsl.rb
/usr/lib/ruby/vendor_ruby/temple/mixins/dispatcher.rb
/usr/lib/ruby/vendor_ruby/temple/mixins/template.rb
/usr/lib/ruby/vendor_ruby/temple/hash.rb
/usr/lib/ruby/vendor_ruby/temple/filters/
/usr/lib/ruby/vendor_ruby/temple/filters/static_merger.rb
/usr/lib/ruby/vendor_ruby/temple/filters/escapable.rb
/usr/lib/ruby/vendor_ruby/temple/filters/dynamic_inliner.rb
/usr/lib/ruby/vendor_ruby/temple/filters/code_merger.rb
/usr/lib/ruby/vendor_ruby/temple/filters/eraser.rb
/usr/lib/ruby/vendor_ruby/temple/filters/multi_flattener.rb
/usr/lib/ruby/vendor_ruby/temple/filters/encoding.rb
/usr/lib/ruby/vendor_ruby/temple/filters/remove_bom.rb
/usr/lib/ruby/vendor_ruby/temple/filters/control_flow.rb
/usr/lib/ruby/vendor_ruby/temple/filters/validator.rb
/usr/lib/ruby/vendor_ruby/temple/parser.rb
/usr/lib/ruby/vendor_ruby/temple/erb/
/usr/lib/ruby/vendor_ruby/temple/erb/trimming.rb
/usr/lib/ruby/vendor_ruby/temple/erb/parser.rb
/usr/lib/ruby/vendor_ruby/temple/erb/engine.rb
/usr/lib/ruby/vendor_ruby/temple/erb/template.rb
/usr/lib/ruby/vendor_ruby/temple/templates/
/usr/lib/ruby/vendor_ruby/temple/templates/tilt.rb
/usr/lib/ruby/vendor_ruby/temple/templates/rails.rb
/usr/lib/ruby/vendor_ruby/temple/engine.rb
/usr/lib/ruby/vendor_ruby/temple/filter.rb
/usr/lib/ruby/vendor_ruby/temple/version.rb
/usr/lib/ruby/vendor_ruby/temple/generators/
/usr/lib/ruby/vendor_ruby/temple/generators/rails_output_buffer.rb
/usr/lib/ruby/vendor_ruby/temple/generators/string_buffer.rb
/usr/lib/ruby/vendor_ruby/temple/generators/erb.rb
/usr/lib/ruby/vendor_ruby/temple/generators/array.rb
/usr/lib/ruby/vendor_ruby/temple/generators/array_buffer.rb
/usr/lib/ruby/vendor_ruby/temple/templates.rb
/usr/lib/ruby/vendor_ruby/temple/exceptions.rb
/usr/lib/ruby/vendor_ruby/temple/generator.rb