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{-# Language FlexibleInstances, TypeFamilies,
DataKinds, PolyKinds, MagicHash #-}
module Main where
import Data.Kind
import GHC.Exts
class Shw (a :: TYPE rep) where
shw :: a -> String
instance Int# ~ a => Shw (a :: TYPE IntRep) where
shw a = "I#" ++ show (I# a)
main = putStrLn (shw 3#)
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