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{-# LANGUAGE TypeFamilies, RankNTypes, ScopedTypeVariables, KindSignatures #-}
module T4310 where
import GHC.ST
import Data.Kind (Type)
type family Mutable a :: Type -> Type -> Type
data New v a = New (forall s. ST s (Mutable v s a))
create :: (forall s. ST s (Mutable v s a)) -> New v a
create = New
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