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rblaze/Fail.hs

Created February 18, 2017 21:55
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Fail.hs
{-# Language TypeFamilies, StandaloneDeriving, GeneralizedNewtypeDeriving, UndecidableInstances #-}
module Example where
newtype N p m a = N (((CT p) m) a)
deriving instance (CT p ~ f, Functor (f m)) => Functor (N p m)
deriving instance (CT p ~ f, Applicative (f m)) => Applicative (N p m) -- internal error when this line added
class C p where
type CT p :: (* -> *) -> * -> *
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