DDMD and such.

[Trass3r]

>> FWIW, There's isn't a very strong separation between the frontend and
>> backend. A lot of the backend functions are in the same AST classes that
>> also have a lot of front-end stuff. I could be wrong, but I'm guessing
>> that could be difficult to have classes that are partially implemented  
>> in C++ and partially in D.
>
> Although that said, DDMD *did* already solve that problem, so maybe it
> wouldn't be too bad after all?

The backend integration in ddmd is rather hackish. It is somehow compiled  
as a library and then called from ddmd. Moreover there are dependencies  
 from the backend back to the frontend that complicate the situation. It  
was rather scary when I last looked at it.