#7873: A poly-kinded newtype existential crisis --------------------------------------+------------------------------------- Reporter: ekmett | Owner: Type: bug | Status: new Priority: normal | Component: Compiler Version: 7.6.3 | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: GHC rejects valid program | Blockedby: Blocking: | Related: --------------------------------------+------------------------------------- Comment(by kosmikus): It works if you restrict `s` in `Magic` to be of a particular kind, for example `*`. I think it's indeed existential if not constrained. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7873#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler