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{-# LANGUAGE TypeFamilies, PolyKinds, MultiParamTypeClasses #-}
module T7278 where
type family TF (t :: k) :: * -> * -> *
class C (t :: k) (dcs :: * -> * -> *)
f :: (C (t :: k) (TF t)) => TF t p1 p0 -> t p1 p0
f = undefined -- panic caused by (t :: k) in the signature's context
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