when is a GDC/D2/Phobos bug a GDC bug?

[bearophile]

Graham Fawcett:

> I've played with the new GDC version today. Overall it seems solid, but
> I've encountered some issues that are probably Phobos-related. Since
> this is my first 64-bit D compiler, I wonder whether some parts of
> Phobos might not yet be 64-bit ready.

Is it possible to improve the D language so there are less problems in converting code written on 32 bit to 64 bit (or the other way around)? There are many possible ideas.

Bye,
bearophile