Friends
I have long advertised a plan to allow so-called superclass equalities. I've
just pushed patches to implement them. So now you can write
class (F a ~ b) => C a b where { ... }
This email is just to encourage you to try them out.
Currently this is just in the HEAD git repository. It'll appear in GHC 7.2, a
release we are now actively preparing. But the feature isn't heavily tested
(since it didn't exist until today), so I'd appreciate people trying it out.
Thanks
Simon
_______________________________________________
Glasgow-haskell-users mailing list
Glasgow-haskell-users@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
