method_missing

# File activesupport/lib/active_support/per_thread_registry.rb, line 51
      def method_missing(name, *args, &block)
        # Caches the method definition as a singleton method of the receiver.
        #
        # By letting #delegate handle it, we avoid an enclosure that'll capture args.
        singleton_class.delegate name, to: :instance

        send(name, *args, &block)
      end