Ok, btw, this works :) data Cnd c where In :: (Eq (c a)) => c a -> [c a] -> Cnd c
check :: (Eq (c a)) => Cnd c -> Bool check (x `In` items) = x `elem` items That's nice :) 2007/3/23, Simon Peyton-Jones <[EMAIL PROTECTED]>:
| Interesting thing though, it's the same on 6.4.1. | | Wasn't this brokenness introduced in 6.6, but rather has lingered in | ghc for a while, or since the introduction of GADTs, at all? No it's always been broken. I finally made GADTs and type classes work together in the HEAD a few months ago, using implication constraints for the first time.
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