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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE ScopedTypeVariables, FlexibleContexts #-}
{-# LANGUAGE TypeOperators #-}
module T15322 where
import Data.Proxy (Proxy (..))
import Type.Reflection
import GHC.TypeLits (KnownNat, type (+))
f :: forall n . (Typeable (n+1), KnownNat n) => Proxy n -> TypeRep (n+1)
f _ = typeRep
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