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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE MultiParamTypeClasses, GADTs, RankNTypes,
ConstraintKinds, QuantifiedConstraints, TypeOperators #-}
module T15359 where
class C a b
data Dict c where
Dict :: c => Dict c
foo :: (forall a b. C a b => a ~ b) => Dict (C a b) -> a -> b
foo Dict x = x
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