#14048: Data instances of kind Constraint -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #12369 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Iceland_jack): Is [https://github.com/ghc-proposals/ghc- proposals/pull/32#issuecomment-319175473 Type v Constraint] not a use case, {{{#!hs data family (=>) data instance (=>) :: forall (r :: RuntimeRep). Constraint -> TYPE r -> Type data instance (=>) :: Constraint -> Constraint -> Constraint data instance (=>) :: forall (r :: RuntimeRep). TYPE r -> Constraint -> Constraint }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14048#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler