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{-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
-- A newtype-deriving test
module Main where
class C a b where
op :: a -> b -> b
instance C [a] Char where
op [] x = x
op _ x = 'z'
newtype T = T Char deriving( Show, C [a] )
main = do { print (op [] 'x')
; print (op [] (T 'y')) }
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