I would have guessed that it's actually due to #11963 [1], and consequently, this [2] backported patch.
Ryan S. ----- [1] https://ghc.haskell.org/trac/ghc/ticket/11963 [2] http://git.haskell.org/ghc.git/commit/18dee8912f6afdcf13073d3d95d85513c14180e3 On Oct 1, 2017 21:19, "Ben Gamari" <[email protected]> wrote: > Ryan Scott <[email protected]> writes: > > > 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! > > > It sounds like you are describing #13391. If this is the case then I'm > rather confused since I didn't merge the associated patch. Something > else must be going on here. Perhaps some other patch made the checks a > bit more strict inadvertently? > > Cheers, > > - Ben > >
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