How to insert code in place with templates/mixins?

[rempas]

On Monday, 20 December 2021 at 11:58:58 UTC, Tejas wrote:
>
> Ehh, it still fails; should've explicitly put the length of the 
> array and the `extern (C)` in `main`
>
> ```d
> module demo;
>
> [ ... ]
>
> extern(C) /+added this because you used -betterC+/ void main() {
>
>     while (true) {
> 		mixin(add_char!'%');
> 		mixin(add_char!'$');
>     }
> }
> ```

Thanks! A mixin is not necessary, it will do the same thing 
without it.