[Haskell-cafe] Undecideable instances for one instance?

[Sergey Zaharchenko]

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,

-- 
DoubleF
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