Which language constructs could be done as a library if we accept some breaking changes?

[12345swordy]

On Wednesday, 1 December 2021 at 15:09:28 UTC, Ola Fosheim 
Grøstad wrote:
> On Wednesday, 1 December 2021 at 15:01:10 UTC, 12345swordy 
> wrote:
>> What you basically are asking for is C with ast macros.
>
> Can you emulate D as C with AST macros?

https://github.com/eudoxia0/cmacro

Why not try it out yourself.