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{-# LANGUAGE DatatypeContexts, ExistentialQuantification #-}
-- Tests the "stupid theta" in pattern-matching
-- when there's an existential as well
module ShouldCompile where
data (Show a) => Obs a = forall b. LiftObs a b
f :: Obs a -> String -- Needs a (Show a) context
f (LiftObs _ _) = "yes"
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