String interpolation, after a healthy debate on discord

[Ola Fosheim Grøstad]

On Thursday, 9 December 2021 at 21:06:11 UTC, WebFreak001 wrote:
> We had an argument on the discord about the 
> [YAIDIP](https://github.com/John-Colvin/YAIDIP) proposal and a 
> simpler syntax form `identifier""` based on Ola Fosheim 
> Grøstad's proposal, and similar to JavaScript's template string 
> syntax.

It is nice to see that you are thinking of ways to make this more 
user (newbie) friendly. What you propose isn't what I suggested 
though, but that is fine.

(I suggested something more generic which would be similar to 
what you would do to support user-provided literals like 
```100kg```, ```3.14rad```, ```100USD```  and where you would 
validate syntax and extract parameters in a customized way (think 
regexp), but there are many ways to Rome. :-)