I'm actually not sure what version of Rust the Servo folk are using... in which case the Rust you're reading may be very different from the language's current iteration. I believe work on Servo started immediately after 0.2 was released, back in March. 0.3 ought to be out sometime this week. And I still wouldn't exactly recommend learning either version, because most of the tutorials and docs still refer to 0.1. :P If you want help learning or want to help out, the devs hang out in #rust on moznet during California working hours.
We're using the bleeding edge master builds of Rust. Our work on Servo informs the direction we want to take Rust, and vice versa. Servo has been really valuable to help us determine whether the language features really work out in practice.
