#8865: Cannot derive well-kinded instance of form ‘Category ----------------------------------------------+---------------------------- Reporter: adinapoli | Owner: Type: bug | Status: closed Priority: normal | Milestone: 7.8.1 Component: Compiler | Version: Resolution: fixed | 7.8.1-rc2 Operating System: MacOS X | Keywords: Type of failure: GHC rejects valid program | Architecture: x86_64 Test Case: | (amd64) Blocking: | Difficulty: Unknown | Blocked By: | Related Tickets: ----------------------------------------------+---------------------------- Comment (by thoughtpolice): Oh, and really, Category isn't necessarily the only thing affected - per the test case, I would actually expect *anything* with a polymorphic kind inferred by `PolyKinds` being enabled will no longer be GND-able, which is quite a shame it would seem. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8865#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler