#11474: incorrect redundant-constraints warning -------------------------------------+------------------------------------- Reporter: hvr | Owner: Type: bug | Status: new Priority: highest | Milestone: 8.0.1 Component: Compiler (Type | Version: 8.0.1-rc1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Good point. Indeed the evidence for `AllNullary` is not used, but its functional dependencies are. I don't know how to reliably detect that. I suppose I could not warn if the class has functional dependencies. (Or maybe if any of its superclasses, transititively, do?) Meanwhile I think we've agreed that this warning will be off by default for 8.0 so you won't see it anyway. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11474#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler