Update enumerable.ex

Author: princemaple

lib/impls/enumerable.ex

@@ -9,5 +9,5 @@ defimpl Enumerable, for: Qex do
     Enumerable.List.reduce(:queue.to_list(q), acc, fun)
   end
 
-  def slice(%Qex{data: q}), do: {:error, __MODULE__}
+  def slice(%Qex{}), do: {:error, __MODULE__}
 end