/usr/ is in ruby-binding-of-caller 0.7.2+debian1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/binding_of_caller.rb
/usr/lib/ruby/vendor_ruby/binding_of_caller/
/usr/lib/ruby/vendor_ruby/binding_of_caller/mri2.rb
/usr/lib/ruby/vendor_ruby/binding_of_caller/version.rb
/usr/lib/ruby/vendor_ruby/binding_of_caller/rubinius.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/binding_of_caller-0.7.2.gemspec
/usr/share/doc/
/usr/share/doc/ruby-binding-of-caller/
/usr/share/doc/ruby-binding-of-caller/copyright
/usr/share/doc/ruby-binding-of-caller/changelog.Debian.gz
/usr/share/doc/ruby-binding-of-caller/README.md