#13506: Spurious extra error message due to functional dependencies -------------------------------------+------------------------------------- Reporter: gelisam | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones <simonpj@…>): In [changeset:"48daaaf0bba279b6e362ee5c632de69ed31ab65d/ghc" 48daaaf/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="48daaaf0bba279b6e362ee5c632de69ed31ab65d" Don't report fundep wanted/wanted errors This makes GHC drop derived FunDep errors when they are come from wanted/wanted interactions. Much along the lines of "don't rewrite wanteds with wanteds". See TcRnTypes Note [Dropping derived constraints] and the new code in isDroppableDerivedLoc. Fixes Trac #13506. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13506#comment:2> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler