I suspect that it might be easy to port most code written in high level languages to Rust if you're willing to use "Rc" or "Arc" liberally. The drawback is Rc does not support cyclic garbage collection (AFAIK), so the resulting code would often have memory leaks.
Weak refs are a way to work around reference counting cycles, but cyclic garbage collection is a more complete solution and it's a core feature of nearly every high level language.
It seems like people who often use Rust's Rc and Arc will long for some way to implement generic cyclic garbage collection. I don't yet see a way (other than unsafe code), but I may be missing something.
