I did a smoke test of Stackage Nightly's libraries [1] this afternoon using GHC 8.2.2. Only two libraries failed to build: extensible-0.4.5 and protolude-0.2, due to a change where type signatures like `foo :: forall k. forall (a :: k). ...` no longer compile without enabling TypeInType.
I only mention this because the migration guide for 8.4 [2] currently gives the impression that this TypeInType change won't land until GHC 8.4. This doesn't appear to be case, though! Ryan S. ----- [1] https://www.stackage.org/nightly-2017-09-29 [2] https://ghc.haskell.org/trac/ghc/wiki/Migration/8.4?version=7#TypeInTypeispickier
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