gadt changes in ghc 6.10

Don Stewart dons at
Tue Oct 14 17:48:11 EDT 2008

> I've tried adding some signatures (together with - 
> XScopedTypeVariables), but with no luck. Why is it that this no longer  
> compiles? More importantly, how can I make it compile again? :)

If you work out how to make it compile, can you document the soln. here,


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