[Gtk2hs-users] Cairo Render monad

[<bri...@ya...>]

   Hi,

   Which class does Render monad instanciates: Monad or MonadPlus 
(beginner question: how would I know that for myself)?
   If Monad is the answer, wouldn't it be nice to use MonadPlus instead? 
   I think things like guard, unless etc. would be nice inside a Render.

   Best,
   Maurício