#8177: Roles for type families -------------------------------------+------------------------------------- Reporter: simonpj | Owner: goldfire Type: bug | Status: new Priority: normal | Milestone: ⊥ Component: Compiler | Version: 7.6.3 Resolution: | Keywords: TypeFamilies Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3662 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
I've uploaded a rough attempt at implementing support for roles for closed type families
Great work! But I really would prefer to see a specification first :-). There's a lot of discussion on this thread about what the specification should even be. It's hard to review an implementation without a spec, covering * Syntax * Typing rules (at least in clear English) * Lots of examples Of course, we'd ultimately like a proof of soundness of the rules, but the "Richard thinks this is right" tests is at least a start. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8177#comment:36 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler