On Tue, Apr 11, 2006 at 09:54:12PM -0400, Robert Dockins wrote: > An additional issue is the following instance declarations, which require > undecidable instances under GHC: > > Eq (s a) => Eq (Rev s a) > (Sequence s, Read (s a)) => Read (Rev s a) > (Sequence s, Show (s a)) => Show (Rev s a)
These are accepted by GHC 6.5, under a relaxed termination condition that is a candidate for Haskell': http://www.haskell.org/ghc/dist/current/docs/users_guide/type-extensions.html#instance-rules _______________________________________________ Haskell-prime mailing list Haskell-prime@haskell.org http://haskell.org/mailman/listinfo/haskell-prime
