Ryan Scott <ryan.gl.sc...@gmail.com> 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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