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{-# LANGUAGE ScopedTypeVariables #-}
module GHCBug where
import Control.Applicative as Ap
import Control.Monad (MonadPlus, mplus, mzero)
import Data.Functor.Identity (Identity, runIdentity)
newtype PrintRuleInterp v = MkPRI { printRule_ :: Int -> String }
class Test p where
test :: p a -> p a
instance Test PrintRuleInterp where
test (f :: p a) =
MkPRI $ printRule_ f
newtype RecDecParser a = MkRD {
parseRD :: String -> [(String, a)]
}
pure_ v = MkRD $ \s -> pure (s , v)
instance MonadPlus RecDecParser where
mzero = MkRD $ const Ap.empty
mplus a b = MkRD $ const Ap.empty
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