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{-# LANGUAGE GADTs, TypeOperators #-}
module T3155 where
-- Test #3155
-- Gave bad error message in GHC 6.10
data Any s where
Any :: s ix -> ix -> Any s
data AnyR s r where
AnyR :: s ix -> r ix -> AnyR s r
unR :: (forall ix. r ix -> ix) -> AnyR s r -> Any s
unR f (AnyR ix rix) = Any ix (f rix)
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