Comments (1)
@ekmett Just for my own edification, wouldn't "smashing the occurrence of f
" involve the following conversion?
fwd :: Functor f => f x -> (forall y. (x -> y) -> f y)
fwd fx = \xy -> fmap xy fx
If we're smashing f (m r)
specifically, plug and chugging converts the following:
newtype FT f m a = FT { runFT :: forall r. (a -> m r) -> (f (m r) -> m r) -> m r }
to:
newtype FT f m a = FT { runFT :: forall r. (a -> m r) -> ((forall x. ((m r) -> x) -> f x) -> m r) -> m r }
Is there some further isomorphism that produces the type you have above?
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