On Fri, May 23, 2008 at 5:11 PM, Thomas Hartman <[EMAIL PROTECTED]> wrote:
>  I am assuming this used to work, but something changed, either in TH
> itself or switching from ghc6.6 to ghc6.8.

The "deriving" rules of 6.8 are more restrictive in some cases.
However,  the same result can be obtained in 6.8 byt using stand-alone
deriving declarations:

 
http://www.haskell.org/ghc/docs/latest/html/users_guide/deriving.html#stand-alone-deriving

I guess this can be the problem.
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