/usr/lib/ruby/ is in ruby-haml-rails 0.9.0-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rails/
/usr/lib/ruby/vendor_ruby/rails/generators/
/usr/lib/ruby/vendor_ruby/rails/generators/haml/
/usr/lib/ruby/vendor_ruby/rails/generators/haml/application_layout/
/usr/lib/ruby/vendor_ruby/rails/generators/haml/application_layout/application_layout_generator.rb
/usr/lib/ruby/vendor_ruby/haml-rails/
/usr/lib/ruby/vendor_ruby/haml-rails/version.rb
/usr/lib/ruby/vendor_ruby/generators/
/usr/lib/ruby/vendor_ruby/generators/haml/
/usr/lib/ruby/vendor_ruby/generators/haml/scaffold/
/usr/lib/ruby/vendor_ruby/generators/haml/scaffold/templates/
/usr/lib/ruby/vendor_ruby/generators/haml/scaffold/templates/new.html.haml
/usr/lib/ruby/vendor_ruby/generators/haml/scaffold/templates/_form.html.haml
/usr/lib/ruby/vendor_ruby/generators/haml/scaffold/templates/index.html.haml
/usr/lib/ruby/vendor_ruby/generators/haml/scaffold/templates/show.html.haml
/usr/lib/ruby/vendor_ruby/generators/haml/scaffold/templates/edit.html.haml
/usr/lib/ruby/vendor_ruby/generators/haml/scaffold/scaffold_generator.rb
/usr/lib/ruby/vendor_ruby/generators/haml/mailer/
/usr/lib/ruby/vendor_ruby/generators/haml/mailer/templates/
/usr/lib/ruby/vendor_ruby/generators/haml/mailer/templates/view.text.haml
/usr/lib/ruby/vendor_ruby/generators/haml/mailer/templates/view.html.haml
/usr/lib/ruby/vendor_ruby/generators/haml/mailer/templates/layout.html.haml
/usr/lib/ruby/vendor_ruby/generators/haml/mailer/templates/layout.text.haml
/usr/lib/ruby/vendor_ruby/generators/haml/mailer/mailer_generator.rb
/usr/lib/ruby/vendor_ruby/generators/haml/controller/
/usr/lib/ruby/vendor_ruby/generators/haml/controller/controller_generator.rb
/usr/lib/ruby/vendor_ruby/generators/haml/controller/templates/
/usr/lib/ruby/vendor_ruby/generators/haml/controller/templates/view.html.haml
/usr/lib/ruby/vendor_ruby/tasks/
/usr/lib/ruby/vendor_ruby/tasks/erb2haml.rake
/usr/lib/ruby/vendor_ruby/haml-rails.rb