[steveklabnik]

I personally like to work on one thing at a time. If you're really trying to learn about how Git works, you should, in my opinion, use a language you already know well. That way, you're focused on learning one thing, not two things at once. So I would recommend using the language that you know best.

Not everyone agrees with me, of course.

As I said, I haven't read the book yet, so I can't tell you how easy/difficult it will be in Rust. The author is learning Rust now, incidentally. But if you need a graph (which you probably will), I'd advise you to use something like https://crates.io/crates/petgraph instead of building one yourself. The difficulty is in writing graphs, not using them.