#14331: Overzealous free-floating kind check causes deriving clause to be rejected -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.2.1 checker) | Resolution: | Keywords: deriving 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): So, if `deriving (C (a :: k))` doesn't mean to quantify, what do you expect it to mean? I agree that the current error is wrong, but I'm not sure what behavior you want GHC to take here. If you want GHC to accept your original declaration, creating `instance forall k (a :: k). C a D`, then we're basically in agreement. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14331#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler