#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 goldfire): It's possible you want this behavior, though, which avoids the need for the kind signature: {{{#!hs type family UnTKind (a :: Type) :: Type where UnTKind (T (_ :: k)) = k type family UnT (a :: Type) :: UnTKind a where UnT (T t) = t tunt :: Dict (T (UnT (T "a")) ~ T "a") tunt = Dict }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13546#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler