Re: [Caml-list] Re: Void type?

["Chris King" <colanderman@gmail.com>]

On 7/31/07, Richard Jones <rich@annexia.org> wrote:
> The question is, which void type definition do you use?
>
>   type void
>
> or
>
>   type void = { v: 'a. 'a }

Personally I would use the second.  That way, when you come across a
void value (say, in pattern matching a variant), you can take care of
that match case without resorting to "assert false" (whether directly
or via void_elim):

type t = A of int | B of void

match foo with
| A i -> print_int i
| B v -> v.v

It makes me feel all warm & fuzzy inside that one doesn't have to
resort to "assert false" here :)