/usr/lib/ruby/vendor_ruby/ is in ruby-schash 0.1.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/schash/
/usr/lib/ruby/vendor_ruby/schash.rb
/usr/lib/ruby/vendor_ruby/schash/schema/
/usr/lib/ruby/vendor_ruby/schash/schema.rb
/usr/lib/ruby/vendor_ruby/schash/schema/dsl.rb
/usr/lib/ruby/vendor_ruby/schash/schema/error.rb
/usr/lib/ruby/vendor_ruby/schash/schema/rule/
/usr/lib/ruby/vendor_ruby/schash/schema/rule.rb
/usr/lib/ruby/vendor_ruby/schash/schema/rule/array_of.rb
/usr/lib/ruby/vendor_ruby/schash/schema/rule/base.rb
/usr/lib/ruby/vendor_ruby/schash/schema/rule/hash.rb
/usr/lib/ruby/vendor_ruby/schash/schema/rule/match.rb
/usr/lib/ruby/vendor_ruby/schash/schema/rule/one_of_types.rb
/usr/lib/ruby/vendor_ruby/schash/schema/rule/optional.rb
/usr/lib/ruby/vendor_ruby/schash/schema/rule/type.rb
/usr/lib/ruby/vendor_ruby/schash/validator.rb
/usr/lib/ruby/vendor_ruby/schash/version.rb