#14822: -XQuantifiedConstraints: Turn term-level entailments (:-) into constraints (=>) -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.5 Resolution: invalid | Keywords: | QuantifiedConstraints, wipT2893 Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * status: new => closed * resolution: => invalid Comment: I fully agree with kcsongor's analysis. This is essentially asking for a way to violate the open-world assumption, which isn't going to fly. If you want to use `(SBoolI b, SBoolI b') => Funny b b'` as a quantified constraint, then write an instance for it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14822#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler