/usr/ is in ruby-power-assert 0.3.0-1.
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/power_assert/
/usr/lib/ruby/vendor_ruby/power_assert/enable_tracepoint_events.rb
/usr/lib/ruby/vendor_ruby/power_assert/version.rb
/usr/lib/ruby/vendor_ruby/power_assert.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-power-assert/
/usr/share/doc/ruby-power-assert/changelog.Debian.gz
/usr/share/doc/ruby-power-assert/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/power_assert-0.2.7.gemspec