ImportC can now automatically run the preprocessor

[jmh530]

On Saturday, 14 May 2022 at 21:05:09 UTC, Walter Bright wrote:
> As https://github.com/dlang/dmd/pull/14121 has been merged, the 
> following #ImportC program can now be compiled and run:
>
>   #include <stdio.h>
>
>   void main()
>   {
>     printf("hello ImportC!\n");
>   }
>
> [snip]

Sorry if this is a dumb question, but when you refer to something 
as a "ImportC" program, what precisely do you mean? It's a D 
program that requires importC features to work?