Strange error in show for datatype

[Marcin 'Qrczak' Kowalczyk]

Thu, 4 Oct 2001 14:29:43 +0100, Ross Paterson <ross@soi.city.ac.uk> pisze:

> So this extension adds something we already have in Haskell 98, with either
> 
> 	newtype Void = Void Void
> or	data Void = Void !Void

Theoretically yes, but this introduces a warning that the data
constructor Void is not used, and it doesn't look clear.

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