ImportC + metaprogramming?

[max haughton]

On Sunday, 16 January 2022 at 08:13:37 UTC, Walter Bright wrote:
> In this PR,
>
> https://github.com/dlang/druntime/pull/3670
>
> I added the ability for an ImportC file to import a D file. The 
> initial purpose was so that core.stdc.stdarg could be imported 
> to support variadics in C, without reimplementing them.
>
> I realized that this actually works - ImportC code can call D 
> code! even use D templates!
>
> So then I got to thinking "what the hell have I unleashed?"
>
> I think I just destroyed dtoh.

So we inject this into all C files before compilation? Or modify 
all the system headers?