Challenge: write a template-instance free dispatcher for text printing

[Atila Neves]

On Monday, 25 May 2026 at 15:19:51 UTC, Richard (Rikki) Andrew 
Cattermole wrote:
> I have a challenge for all to try!
>
> For Walter says templates must be avoided in some core code!
>
> So let's see if D can do it, but... There are two rules.
>
> 1. You cannot use ANY template instantiations to do the work 
> itself
>
> 2. No string mixins!
>
> Both of these are expensive, and they need to go.

What's expensive about string mixins?