#9123: Need for higher kinded roles -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler (Type | Version: 7.8.2 checker) | Keywords: Roles, Resolution: | QuantifiedConstraints Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: quantified- | constraints/T9123{,a} Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by goldfire): * owner: goldfire => (none) * status: closed => new * resolution: fixed => Comment: We cannot yet accept the program in the original post, due to (at least) #15290. I also think that, in the case of inferring the constraints in a `deriving` clause, we ''should'' sometimes infer a quantified constraint. I'd like to keep this ticket open until we can safely put `join` into `Monad`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9123#comment:58 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler