[zokier]

D is mature and actually usable, Rust is in alpha stages at best. The current outlook seems to be that they should be fairly comparable one day, but right now making such comparisons wouldn't be really fair. We don't even know yet what the final form of Rust will be like.

[steveklabnik]

The core language is pretty much settled at this point, it's mostly libraries that are actually changing. The syntax is basically finished.

That doesn't mean that it's stable, it's just that we do know what it looks like.