> I feel confident that my Rust is strong enough that I can already write any structure that is expressible in another language.

I think it still can't handle arbitrary reference graphs without a garbage collector. If I'm wrong, please correct me, and provide proof. I'm very interested in the problem of non-GC arbitrary reference graph cleanups.

On the other hand, one could ask the question of do we really need the arbitrary reference graphs? Or are they just a crutch that we use to make things easier for us? Perhaps every algorithm that requires a complex reference graph can be also expressed in Rust's safe mechanisms.

Note that I don't have any deep knowledge about Rust, only stuff that I've read on various blogs.