String interpolation, after a healthy debate on discord

[Adam D Ruppe]

On Tuesday, 14 December 2021 at 15:58:21 UTC, WebFreak001 wrote:
> I was thinking about this as well - it would work but would run 
> at runtime.

Not necessarily - the string literal portions ARE available at 
compile time and the function could just choose to return those 
as a ctfe calculation.

That's one of the deeper layers of good about this dip.