Stefan Holdermans <[EMAIL PROTECTED]> wrote:
> What about the following (tested with GHC 6.6)?
and [EMAIL PROTECTED] wrote:
>
> One way is to use existentials:
> Perhaps a better -- and a more general alternative -- is to use
> type-level programming to its fullest.
Thanks everyone, those a
Greg Buchholz wrote:
> I'm wondering about creating a data structure that has the type of
> decreasing numbers.
> I can try...
>
> class Pre a b | a -> b
> instance Pre (Succ a) a
> instance Pre Zero Zero
>
> data (Pre a b) => Seq a = Cons a (Seq b) | Nil
>
> decreasing = Cons three (Cons two
