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{-# LANGUAGE FlexibleContexts, MultiParamTypeClasses, TypeFamilies #-}
module T4497 where
norm2PropR a = twiddle (norm2 a) a
twiddle :: Normed a => a -> a -> Double
twiddle a b = undefined
norm2 :: e -> RealOf e
norm2 = undefined
class (Num (RealOf t)) => Normed t
type family RealOf x
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