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
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