[Haskell-cafe] New type of ($) operator in GHC 8.0 is problematic

[Marcin Mrotek]

>
> maybe :: forall (r :: RuntimeRep) (a :: *) (b :: TYPE r). b -> (a -> b) ->
> Maybe a -> b
>

`b` also is a type of an argument in that function, so I think being levity
polymorphic on it in is excluded by "GC going haywire chasing values as if
they were pointers" as described here:
https://mail.haskell.org/pipermail/ghc-devs/2016-February/011269.html

Best regards,
Marcin Mrotek
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