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{-# LANGUAGE UnliftedNewtypes #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE MagicHash #-}
{-# LANGUAGE UnboxedTuples #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE TypeApplications #-}
module UnliftedNewtypesUnassociatedFamily where
import GHC.Int (Int(I#))
import GHC.Word (Word(W#))
import GHC.Exts (Int#,Word#)
import GHC.Exts (TYPE,Levity(Lifted))
import GHC.Exts (RuntimeRep(BoxedRep,IntRep,WordRep,TupleRep))
data family DFT (r :: RuntimeRep) :: TYPE r
newtype instance DFT 'IntRep = MkDFT1 Int#
newtype instance DFT 'WordRep = MkDFT2 Word#
newtype instance DFT ('TupleRep '[ 'IntRep, 'WordRep])
= MkDFT3 (# Int#, Word# #)
data instance DFT ('BoxedRep 'Lifted) = MkDFT4 | MkDFT5
data family DF :: TYPE (r :: RuntimeRep)
-- Use a type application
newtype instance DF @IntRep = MkDF1 Int#
-- Use a kind signature
newtype instance DF :: TYPE 'WordRep where
MkDF2 :: Word# -> DF
-- Also uses a kind signature
newtype instance DF :: TYPE ('TupleRep '[ 'IntRep, 'WordRep ]) where
MkDF3 :: (# Int#, Word# #) -> DF
data instance DF = MkDF4 | MkDF5
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