/usr/ is in ruby-contracts 0.16.0-1.
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..
/usr/share/doc/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/contracts/
/usr/lib/ruby/vendor_ruby/contracts/attrs.rb
/usr/lib/ruby/vendor_ruby/contracts/builtin_contracts.rb
/usr/lib/ruby/vendor_ruby/contracts/call_with.rb
/usr/lib/ruby/vendor_ruby/contracts/core.rb
/usr/lib/ruby/vendor_ruby/contracts/decorators.rb
/usr/lib/ruby/vendor_ruby/contracts/engine/
/usr/lib/ruby/vendor_ruby/contracts/engine/base.rb
/usr/lib/ruby/vendor_ruby/contracts/engine/eigenclass.rb
/usr/lib/ruby/vendor_ruby/contracts/engine/target.rb
/usr/lib/ruby/vendor_ruby/contracts/engine.rb
/usr/lib/ruby/vendor_ruby/contracts/errors.rb
/usr/lib/ruby/vendor_ruby/contracts/formatters.rb
/usr/lib/ruby/vendor_ruby/contracts/invariants.rb
/usr/lib/ruby/vendor_ruby/contracts/method_handler.rb
/usr/lib/ruby/vendor_ruby/contracts/method_reference.rb
/usr/lib/ruby/vendor_ruby/contracts/support.rb
/usr/lib/ruby/vendor_ruby/contracts/validators.rb
/usr/lib/ruby/vendor_ruby/contracts/version.rb
/usr/lib/ruby/vendor_ruby/contracts.rb
/usr/share/
/usr/share/doc/ruby-contracts/
/usr/share/doc/ruby-contracts/README.md
/usr/share/doc/ruby-contracts/changelog.Debian.gz
/usr/share/doc/ruby-contracts/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/contracts-0.16.0.gemspec