Re: [Caml-list] Error: Unbound value abs_num

[David Allsopp <dra-news@metastack.com>]

zech.ph@gmail.com wrote:

> Hi,
> 
> I'm new to OCaml and already struggling around with the seemingly easiest
> things.
> Following some introductory texts I wanted to play around a little with the
> toplevel and its various features, among others, using provided modules. For
> this, I thought about loading nums.cma and try some of its defined functions,
> but it just does not work. See below for what I do in the toplevel and the
> respective output.
> 
>> ocaml
>        OCaml version 4.00.1
> # #load "nums.cma";;
> # abs_num 4;;
> Error: Unbound value abs_num

You need to qualify the identifier or open the module - abs_num is in the Num module (which you've correctly #load'd with nums.cma) so you either say:

Num.abs_num 4;;
or
open Num;;
abs_num 4;;

however you'll then hit another problem - abs_num needs a num not an int so you really mean:

Num.abs_num (Num.Int 4);;

> # abs 4;;
> - : int = 4
> 
> From my point it looks like I do not miss anything, yet, I just can't call
> abs_num. And I don't know why. I'm working on a Fedora 19 x64. I checked
> Bugzilla, but couldn't find any Fedora related issues (at least for this
> behavior).

It's unlikely when beginning that you'll hit either a big in OCaml or your distro - better to stick with the assumption that you've made a mistake and ask for help (as you have!)


David