#16263: GHC accepts illegal constraint in kind -------------------------------------+------------------------------------- Reporter: goldfire | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 Keywords: TypeInType | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- GHC 8.6 accepts {{{#!hs data Q :: Eq a => Type }}} It shouldn't, as we can't have `Eq a` as a constraint in kinds. Note that writing a constructor for `Q` is rejected. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16263 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler