/usr/ is in ruby-dirty-memoize 0.0.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/dirty-memoize-0.0.4.gemspec
/usr/share/doc/
/usr/share/doc/ruby-dirty-memoize/
/usr/share/doc/ruby-dirty-memoize/copyright
/usr/share/doc/ruby-dirty-memoize/changelog.Debian.gz
/usr/share/doc/ruby-dirty-memoize/examples/
/usr/share/doc/ruby-dirty-memoize/examples/reader_and_writer.rb
/usr/share/doc/ruby-dirty-memoize/examples/only_reader.rb
/usr/share/doc/ruby-dirty-memoize/README.txt
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/dirty-memoize.rb