On 23 December 2011 17:44, Simon Peyton-Jones <simo...@microsoft.com> wrote: > My attempt at forming a new understanding was driven by your example. > > class Functor f where > type C f :: * -> Constraint > type C f = () > > sorry -- that was simply type incorrect. () does not have kind * -> > Constraint
So am I correct that the `class Empty a; instance Empty a` trick is currently the only way to get default associated empty constraints? Will this change in GHC-7.4.1? (For example by having an overloaded `()`) The reason I ask is I would like to know if it's already feasible to start proposing adding these associated constraints to Functor, Applicative and Monad. Cheers, Bas _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
