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{-# LANGUAGE DefaultSignatures, FlexibleContexts, DeriveGeneric #-}
{-# LANGUAGE FlexibleInstances #-}
module T7437 where
import GHC.Generics
class GPut f where
gput :: f a -> [()]
class Put a where
put :: a -> [()]
default put :: (Generic t, GPut (Rep t)) => t -> [()]
put = gput . from
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