#13643: Core lint error with TypeInType and TypeFamilyDependencies -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: | InjectiveFamilies, TypeInType Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #12102 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): I believe this is the same as #12919, although the symptoms are markedly different. The problem is that (because flattened types have flattened kinds), flattening `T I (False |> co)` (where `co :: Bool ~ Interp I`) yields the ill-kinded `T I False`. Instead, we should change the kind invariant on flattening to say that flattening does not change a type's kind. Then this problem (and #12919) are fixed. I hope. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13643#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler