Casey McCann gmail.com> writes:
> {-# LANGUAGE MultiParamTypeClasses, GADTs #-}
> import qualified Control.Category as Cat
>
> data ChainableFunction a b where
> CF :: (Num a, Num b) => (a->b) -> (a->b) -> ChainableFunction a b
> CFId :: ChainableFunction a a
>
> instance Cat.Category C
Hi, I got an issue when playing haskell's type system, partically parametic
class/instance have no way to specify constrains of their parameters. for
example, i want to data struct to chain functions and their derivatives so we
can have combined function and derivations, as following
import qualif
