#10524: PolyKinds doesn't interact well with DeriveFunctor -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by rwbarton): The instance head `Functor (Compose f g)` is well-kinded, but the context `(Functor f, Functor g)` is not unless `k = *`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10524#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler