GADT Type Checking GHC 6.10 versus older GHC

Simon Peyton-Jones simonpj at
Fri Nov 28 03:47:03 EST 2008

| > 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
| 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.


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