#14734: QuantifiedConstraints conflated with impredicative polymorphism? -------------------------------------+------------------------------------- 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: | -------------------------------------+------------------------------------- Comment (by Iceland_jack): Btw, should the following work? {{{#!hs GHCi, version 8.5.20180128: http://www.haskell.org/ghc/ :? for help Prelude> :set -XGADTs -XQuantifiedConstraints -XConstraintKinds Prelude> data Imp a b where Imp :: (a => b) => Imp a b Prelude> :kind forall a b. Imp a (b => a) forall a b. Imp a (b => a) :: * Prelude> }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14734#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler