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{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
-- This one foxed the constraint solver (Lint error)
-- See Trac #1494
module ShouldCompile where
import Control.Monad.State
newtype L m r = L (StateT Int m r)
instance Functor (L m) where
fmap = undefined
instance Applicative (L m) where
pure = undefined
(<*>) = undefined
instance Monad m => Monad (L m) where
(>>=) = undefined
return = undefined
zork :: (Monad m) => a -> L m ()
zork = undefined
mumble e = do { modify id; zork e }
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