/usr/lib/ruby/ is in ruby-amqp 1.6.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/amqp/
/usr/lib/ruby/vendor_ruby/amqp/integration/
/usr/lib/ruby/vendor_ruby/amqp/integration/rails.rb
/usr/lib/ruby/vendor_ruby/amqp/broker.rb
/usr/lib/ruby/vendor_ruby/amqp/consumer.rb
/usr/lib/ruby/vendor_ruby/amqp/handlers_registry.rb
/usr/lib/ruby/vendor_ruby/amqp/channel_id_allocator.rb
/usr/lib/ruby/vendor_ruby/amqp/auth_mechanism_adapter/
/usr/lib/ruby/vendor_ruby/amqp/auth_mechanism_adapter/plain.rb
/usr/lib/ruby/vendor_ruby/amqp/auth_mechanism_adapter/external.rb
/usr/lib/ruby/vendor_ruby/amqp/utilities/
/usr/lib/ruby/vendor_ruby/amqp/utilities/server_type.rb
/usr/lib/ruby/vendor_ruby/amqp/utilities/event_loop_helper.rb
/usr/lib/ruby/vendor_ruby/amqp/settings.rb
/usr/lib/ruby/vendor_ruby/amqp/header.rb
/usr/lib/ruby/vendor_ruby/amqp/session.rb
/usr/lib/ruby/vendor_ruby/amqp/framing/
/usr/lib/ruby/vendor_ruby/amqp/framing/string/
/usr/lib/ruby/vendor_ruby/amqp/framing/string/frame.rb
/usr/lib/ruby/vendor_ruby/amqp/queue.rb
/usr/lib/ruby/vendor_ruby/amqp/openable.rb
/usr/lib/ruby/vendor_ruby/amqp/compatibility/
/usr/lib/ruby/vendor_ruby/amqp/compatibility/ruby187_patchlevel_check.rb
/usr/lib/ruby/vendor_ruby/amqp/int_allocator.rb
/usr/lib/ruby/vendor_ruby/amqp/consumer_tag_generator.rb
/usr/lib/ruby/vendor_ruby/amqp/deferrable.rb
/usr/lib/ruby/vendor_ruby/amqp/bit_set.rb
/usr/lib/ruby/vendor_ruby/amqp/exceptions.rb
/usr/lib/ruby/vendor_ruby/amqp/exchange.rb
/usr/lib/ruby/vendor_ruby/amqp/callbacks.rb
/usr/lib/ruby/vendor_ruby/amqp/channel.rb
/usr/lib/ruby/vendor_ruby/amqp/version.rb
/usr/lib/ruby/vendor_ruby/amqp/entity.rb
/usr/lib/ruby/vendor_ruby/amqp/extensions/
/usr/lib/ruby/vendor_ruby/amqp/extensions/rabbitmq.rb
/usr/lib/ruby/vendor_ruby/amqp/auth_mechanism_adapter.rb
/usr/lib/ruby/vendor_ruby/amq/
/usr/lib/ruby/vendor_ruby/amq/protocol/
/usr/lib/ruby/vendor_ruby/amq/protocol/get_response.rb
/usr/lib/ruby/vendor_ruby/amqp.rb