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tokiwoousaka/nop.hs

Created August 5, 2015 12:20
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nop.hs
module Main where
data Nop a
instance Monad Nop where
(>>=) = undefined
return = undefined
runNop :: Nop a -> ()
runNop _ = ()
main :: IO ()
main = return $ runNop (add 10 20)
add :: Monad m => Int -> Int -> m Int
add x y = return $ x + y
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