printf() metaprogramming challenge

[Petar]

On Friday, 24 May 2019 at 09:52:58 UTC, Radu wrote:
>
> Yes, good point! I forgot about this trick.

Best verified on d.godbolt.org. Compare:

* https://d.godbolt.org/z/E8aoBg - compiles without -betterC, 
generates a ton of bloat

* https://d.godbolt.org/z/GGh9c1 - same, but doesn't compile with 
-betterC

* https://d.godbolt.org/z/mPQMcc - compiles with -betterC

* 
https://run.dlang.io/gist/run-dlang/1caf15c8c7dded16ba812353361feda9 - what I would like to write, but currently produces too much bloat and doesn't work with -betterC

The examples above, were inspired by 
https://twitter.com/Cor3ntin/status/1127210941718962177. I wanted 
to check how D with -betterC would compare to C++23+ w.r.t code 
gen (bloat).