         $div = $('<div/>')
         if contents?
           if _.isFunction contents
-            return @nested_item $div, contents
+            return @nested_item contents
           else
             $div.append contents
         @add_rendered $div

          else
            "#{ms} ms"

        renderable = immediate_renderable_list_builder $item
        @add_renderable renderable
        nested_context = @create_nested_context
          renderable_list_builder: renderable

        promise = nested_context.apply_to fn
        asyncs.push 1
        promise.finally =>
          asyncs.push -1

        o

      create_nested_renderable_context: ($item) ->
        $item = $ "<div/>"
        renderable = delayed_then_immediate_renderable_list_builder $item
        @create_nested_context
          renderable_list_builder: renderable
