#13546: Kind error with type equality -------------------------------------+------------------------------------- Reporter: int-index | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: TypeInType 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 int-index): Ok, so if I write {{{#!hs type family UnT (a :: Type) :: k where UnT (T (t :: k')) = t }}} the `k ~ k'` proof for the RHS is provided by the LHS. Can I write a LHS that will match on `t :: k'` for all kinds `k'` and try to unify `k ~ k'` only on the RHS? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13546#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler