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jmikkola/free_monad_mvp.hs

Created July 7, 2017 23:19
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free_monad_mvp.hs
{-# LANGUAGE DeriveFunctor #-}
import Control.Monad.Free
data MThing next
= MItem String next
| MEnd
deriving (Show, Functor)
doThing :: Free MThing ()
doThing = do
mitem "foo"
mitem "bar"
stop
mitem :: String -> Free MThing ()
mitem s = Free (MItem s (Pure ()))
stop :: Free MThing ()
stop = Free MEnd
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