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{-# LANGUAGE ExistentialQuantification #-}
-- Exmaples from Doaitse Swierestra and Brandon Moore
-- GHC users mailing list, April 07, title "Release plans"
-- This one should fail, but Hugs passes it
module ShouldFail where
data T s = forall x. T (s -> (x -> s) -> (x, s, Int))
run :: T s -> Int
run ts = case ts of
T g -> let (x,_, b) = g x id
in b
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