GADT Type Checking GHC 6.10 versus older GHC
dominic.steinitz at blueyonder.co.uk
Fri Nov 28 03:49:35 EST 2008
Simon Peyton-Jones wrote:
> | > I also feel that the type errors given when working with existential
> | > types, especially GADTs with existentials, are confusing. I think
> | I am using existential types to test GADT code. See
> | http://www.haskell.org/haskellwiki/QuickCheck_/_GADT which no longer
> | works with 6.10.1.
> Really? I've just compiled that entire page with 6.10.1, and it was fine, except that I had to add a type signature for prettyRep. No problems there.
Sorry I inadvertently used an old copy of ghc.
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