Rust is working out very well so far. If you look at the rope implementation, you&#x27;ll see that it&#x27;s high level and mathematical almost like a functional language, but performance is first-class. I&#x27;m also very much looking forward to retrofitting parallelism using libraries such as Rayon and crossbeam. I&#x27;ll probably write a retrospective when I&#x27;m farther into the project.<p>My current development environment is just Sublime Text for the Rust parts, and Xcode for the parts written in Swift.