On 2014-11-11 at 14:32:47 +0100, Richard Eisenberg wrote:
> What would the semantics of subtraction be for this? I'm assuming
> there would be a `Num` instance for `Natural`.

It wouldn't be total, and 'throw (Underflow :: ArithException)' if the
result would fall outside the non-negative domain.

This is similiar to how e.g.

 http://hackage.haskell.org/package/nats-0.2/docs/Numeric-Natural.html

handles out-of-domain subtraction results.

--
You received this message because you are subscribed to the Google Groups "haskell-core-libraries" group.
To unsubscribe from this group and stop receiving emails from it, send an email to haskell-core-libraries+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.