# File lib/puma/events.rb, line 64
    def unknown_error(server, error, kind="Unknown")
      if error.respond_to? :render
        error.render "#{Time.now}: #{kind} error", @stderr
      else
        @stderr.puts "#{Time.now}: #{kind} error: #{error.inspect}"
        @stderr.puts error.backtrace.join("\n")
      end
    end