FW: [GHC] #2467: orphan instance warnings are badly behaved

José Pedro Magalhães jpm at cs.uu.nl
Tue Nov 24 08:27:44 EST 2009


Hello,

On Mon, Nov 23, 2009 at 18:23, Simon Peyton-Jones <simonpj at microsoft.com> wrote:
> libraries/syb/Data/Generics/Instances.hs:{-# OPTIONS_GHC -fno-warn-orphans #-}

This module has loads of Data (defined in Data.Data) instances for
many types that it imports. I don't think there's any way to solve
this without severely breaking backward compatibility.

Anyway, syb will no longer come with 6.14, if I understand correctly,
so I'm guessing this module in particular is not a big problem.


Cheers,
Pedro



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