Sort of. I believe you can use type equality constraints to replace the use of TypeCast; that is, in any code that looks like:

instance TypeCast a HTrue => ...

you can write

instance (a ~ HTrue) => ...

(at least, it has worked for me that way) This at least makes me feel a bit more monadic (warm & fuzzy!) than the indecipherable magic that is the declaration of TypeCast/TypeCast'/TypeCast'' -- ryan On Thu, Dec 4, 2008 at 3:09 PM, Nicolas Frisby wrote:

1) Type families, associated types, synonyms... can anything replace the use of TypeCast for explicit instance selection? Section 2, bullet 4 of http://www.haskell.org/haskellwiki/GHC/AdvancedOverlap indicates a negative response. Any other ideas?

2) Any progress/options for kind polymorphism in instances?

Thanks for your time. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe