[Haskell-cafe] Instances that shouldn't overlap

Paul Johnson paul at cogito.org.uk
Wed Nov 26 15:21:26 EST 2008


Paul Johnson wrote:
> Hi,
>
> I'm trying to set up some operators for applicative versions of 
> prelude types.  

I forgot to mention, I'm using {-# OPTIONS_GHC 
-fallow-undecidable-instances -XFlexibleInstances 
-XMultiParamTypeClasses #-}

Paul.


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