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module T22707 where
newtype Cont o i a = Cont {runCont ::(a -> i) -> o }
t1:: Cont (i2 -> o) i1 a -> Cont o i2 (a -> i1)
t1 c = Cont $ \ati1tti2 -> (runCont c) (ati1tti2 $ \a -> evalCont (t1 c) >>== \ati1 -> return ati1 a )
evalCont:: Cont o a a -> o
evalCont c = (runCont c)id
instance Monad (Cont p p) where
return a = Cont ($ a)
(>>=) = (>>==)
class PMonad m where
(>>==):: m p q a -> (a -> m q r b) -> m p r b
instance PMonad Cont where
(Cont cont) >>== afmb = Cont $ \bti -> cont $ \a -> (runCont . afmb) a bti
main:: IO ()
main = putStrLn "bug"
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