Just another example of missing string interpolation

[Andrea Fontana]

On Thursday, 19 October 2023 at 10:53:08 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
> As long as the literal cannot expand out into regular strings 
> and only structs, this shouldn't be possible for it to occur 
> silently.
>
> From there its just a matter of having good error message 
> writing where it sees what you tried to do and tell you why its 
> wrong. This can happen incrementally.

But walter's proposal expands it to a tuple if I understand it 
correctly:
https://github.com/dlang/DIPs/blob/148001a963f5d6e090bb6beef5caf9854372d0bc/DIPs/DIP1027.md