#15347: QuantifiedConstraints: Implication constraints with type families don't work -------------------------------------+------------------------------------- Reporter: aaronvargo | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.5 checker) | Keywords: Resolution: | QuantifiedConstraints 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 aaronvargo): Replying to [comment:16 simonpj]: I thought I'd once seen a ticket for this, and I've managed to find it: see #3490, where you write:
The easiest way forward is to re-express your program using type functions
Also, on second thought, what I said in comment:18 won't work. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15347#comment:19 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler