#8090: MetaKinds - PolyKinds generalization ------------------------------------+------------------------------------- Reporter: wvv | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- MetaKinds is more general then PolyKinds. Now we could write with PolyKinds {{{ class Foo (a :: k) where ... }}} It would be nice if we could also write with MetaKinds next: {{{ class Foo (a :: (k :: *)) where ... }}} As we already have Rank2Types and RankNTypes, PolyKinds ~ Rank2Types, MetaKinds ~ RankNTypes This will be valid: {{{ class Foo (a :: (k :: (u :: *))) where ... }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8090 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler