/usr/lib/ruby/vendor_ruby/ is in ruby-haml 4.0.7-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/haml/helpers/
/usr/lib/ruby/vendor_ruby/haml.rb
/usr/lib/ruby/vendor_ruby/haml/
/usr/lib/ruby/vendor_ruby/haml/version.rb
/usr/lib/ruby/vendor_ruby/haml/buffer.rb
/usr/lib/ruby/vendor_ruby/haml/compiler.rb
/usr/lib/ruby/vendor_ruby/haml/error.rb
/usr/lib/ruby/vendor_ruby/haml/template.rb
/usr/lib/ruby/vendor_ruby/haml/exec.rb
/usr/lib/ruby/vendor_ruby/haml/helpers.rb
/usr/lib/ruby/vendor_ruby/haml/railtie.rb
/usr/lib/ruby/vendor_ruby/haml/helpers/xss_mods.rb
/usr/lib/ruby/vendor_ruby/haml/helpers/action_view_mods.rb
/usr/lib/ruby/vendor_ruby/haml/helpers/action_view_xss_mods.rb
/usr/lib/ruby/vendor_ruby/haml/helpers/safe_erubis_template.rb
/usr/lib/ruby/vendor_ruby/haml/helpers/action_view_extensions.rb
/usr/lib/ruby/vendor_ruby/haml/sass_rails_filter.rb
/usr/lib/ruby/vendor_ruby/haml/parser.rb
/usr/lib/ruby/vendor_ruby/haml/engine.rb
/usr/lib/ruby/vendor_ruby/haml/util.rb
/usr/lib/ruby/vendor_ruby/haml/template/
/usr/lib/ruby/vendor_ruby/haml/template/plugin.rb
/usr/lib/ruby/vendor_ruby/haml/template/options.rb
/usr/lib/ruby/vendor_ruby/haml/options.rb
/usr/lib/ruby/vendor_ruby/haml/filters.rb