Hello Christophe! Wed, Jun 07, 2006 at 10:27:22AM +0200 you wrote:
> The sample code is:
>
> {-# OPTIONS_GHC -fglasgow-exts #-}
> module Main where
>
> data Located a = L a
>
> class Locatable a where
> value :: Located a -> a
> wrap :: a -> Located a
>
> instance Locatable a where
You probably mean ``instance Locatable (Located a)'', don't you?
> value (L a) = a
> wrap a = L a
HTH,
--
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