D-etractions A real world programmers view on D

[Mehrdad]

On Thursday, 30 August 2012 at 19:00:58 UTC, Steven Schveighoffer 
wrote:
> And I edit x.h, how does it know the original source file which 
> includes x.h does or doesn't define A before including x.h?  
> That is the issue I was having.

I don't understand why that should be so difficult...

Why can't the IDE just scan all the #include dependencies in an 
internal database, and update them accordingly?