But even in the more general form it would be quite do-able I think. So, if allowing quantified constraints will help, perhaps it's time we bit
#8516: Add (->) representation and the Invariant class to GHC.Generics -------------------------------------+------------------------------------- Reporter: nfrisby | Owner: Type: feature request | Status: new Priority: low | Milestone: Component: Compiler (Type | Version: 7.7 checker) | Resolution: | Keywords: Generics Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Replying to [comment:9 simonpj]: that bullet. I think this is do-able. (I'm not currently volunteering to do it, though. Perhaps in the future, as doing this looks fun.) See our conversation starting at comment:14:ticket:2256. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8516#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler