# File lib/sinatra/rack_accept.rb, line 28
    def self.registered(app)
      app.helpers Rack::RespondTo::Helpers
      app.class_eval do
        alias :render_without_format :render
        def render(*args, &block)
          begin
            assumed_layout = args[1] == :layout
            args[1] = "#{args[1]}.#{@media_type}".to_sym if args[1].is_a?(::Symbol)
            render_without_format *args, &block
          rescue Errno::ENOENT => e
            raise "ERROR: Missing template: #{args[1]}.#{args[0]}" unless assumed_layout
            raise e
          end
        end
        private :render
      end
    end