/usr/lib/ is in ruby-dependor 1.0.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/dependor/constructor.rb
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/dependor/
/usr/lib/ruby/vendor_ruby/dependor/sending_injector.rb
/usr/lib/ruby/vendor_ruby/dependor/class_name_resolver.rb
/usr/lib/ruby/vendor_ruby/dependor/let.rb
/usr/lib/ruby/vendor_ruby/dependor/auto_inject.rb
/usr/lib/ruby/vendor_ruby/dependor/shorty.rb
/usr/lib/ruby/vendor_ruby/dependor/instantiator.rb
/usr/lib/ruby/vendor_ruby/dependor/auto_injector.rb
/usr/lib/ruby/vendor_ruby/dependor/exceptions.rb
/usr/lib/ruby/vendor_ruby/dependor/evaluating_injector.rb
/usr/lib/ruby/vendor_ruby/dependor/dependency_names_cache.rb
/usr/lib/ruby/vendor_ruby/dependor/rspec.rb
/usr/lib/ruby/vendor_ruby/dependor/isolate.rb
/usr/lib/ruby/vendor_ruby/dependor/customized_injector.rb
/usr/lib/ruby/vendor_ruby/dependor/injectable.rb
/usr/lib/ruby/vendor_ruby/dependor/version.rb
/usr/lib/ruby/vendor_ruby/dependor.rb