How to fix "typesafe variadic function parameter"?

[Andrey Zherikov]

On Tuesday, 24 May 2022 at 22:51:50 UTC, Adam Ruppe wrote:
> On Tuesday, 24 May 2022 at 22:46:55 UTC, Andrey Zherikov wrote:
>> 	return S(s);
>
> return S(s.dup);
>
>
> The variadic lives in a temporary array that expires at the end 
> of the function. So copying it out to the GC lets it live on.
>
> Your code was wrong on 2.099 too, but the compiler didn't tell 
> you.

That works, thank you!

Can this error message be improved some way so this fix becomes 
obvious?