#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 Simon Peyton Jones <simonpj@…>): In [changeset:"82b77ec375ab74678ac2afecf55dc574fa24490f/ghc" 82b77ec/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="82b77ec375ab74678ac2afecf55dc574fa24490f" Do not quantify over deriving clauses Trac #14331 showed that in a data type decl like data D = D deriving (C (a :: k)) we were quantifying D over the 'k' in the deriving clause. Yikes. Easily fixed, by deleting code in RnTypes.extractDataDefnKindVars See the discussion on the ticket, esp comment:8. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14331#comment:10> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler