#12432: TypeInType: open type family application as type family return kind fails to compile -------------------------------------+------------------------------------- Reporter: j6carey | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 (Type checker) | Keywords: | Operating System: Linux Architecture: | Type of failure: GHC rejects Unknown/Multiple | valid program Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- With TypeInType enabled, I can use a closed type family to compute the return kind of a type family from its arguments. But an equivalent open type family used in the same way triggers a compilation failure, as if the relevant instance of that open type family were not considered. (Of course, there may be some subtle prohibition of which I am not aware at the present time.) I will attach a test case. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12432 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler