D as a prototyping language (for C/C++ projects)

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> I'm surprised to see many people doing this. But I'm wondering..
> If you already got the code working in D, why not let it stay 
> there and write a C interface?
> Company policy? Missing dynamic loading? Some build issues?
>
> If the code could stay in D, it would seem like a good way to 
> slowly integrate D into a company.

As we said: D isn't mature enough.
As long as your code base isn't too complex, D is very nice but 
at some point you get many stumbling blocks, bugs or missing 
features which is very annoying. I like D, but it is far away 
from using it instead of C++.