#14121: ghc master requires -XTypeInType where 8.2.1 does not -------------------------------------+------------------------------------- Reporter: duog | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler (Type | Version: 8.3 checker) | Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): Good thought bgamari, I've [https://ghc.haskell.org/trac/ghc/wiki/Migration/8.4?version=4 added a blurb] about this to the 8.4 migration guide. I don't think it would hurt adding mention of the fact that `TypeInType`'s validity checks tightened up in the release notes. FWIW, there is [https://phabricator.haskell.org/D3859 another patch] in the works that will make `TypeInType` pickier w.r.t. GADTs as well, so it might also behoove us to mention that as well. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14121#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler