#9123: Need for higher kinded roles -------------------------------------+------------------------------------ Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by simonpj): Edward, can you elaborate the "without it you cannot write.." issue, perhaps on the wiki page, so we have it recorded properly? In the short term (i.e. before we converge on a better design for roles) I think we have these alternatives: * Defer AMP altogether (very undesirable) * Remove `join` from `Monad` in the AMP story (better) * Adopt full AMP (`join` and all), but accept that GND `deriving( Monad )` won't work for some monad transformers; you have to write it by hand. I am agnostic. It's a library issue. Edward, which would you like? Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9123#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler