#5927: A type-level "implies" constraint on Constraints -------------------------------------+------------------------------------- Reporter: illissius | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 7.4.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Iceland_jack): Would there be a difference between {{{#!hs data Some :: (Type -> Constraint) -> Type where Some :: c a => a -> Some c }}} and {{{#!hs data Some' :: (Type -> Constraint) -> Type where Some' :: (ctx `Implies` c, c a) => a -> Some' ctx }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/5927#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler