[0815test]

First of all, the borrow checker is useful any time you have data that's potentially being accessed from multiple "places" in the code. At a bare minimum, it forces you to mark such data with type constructors such as Cell<> that make it clear where error-prone shared state can occur. Secondly, Rust is an appealing alternative to C++ as a "better C" language. C++ used to be quite acceptable as such, but recent C++ standards come with a huge amount of incidental complexity, so moving to something cleaner can make sense at least for "greenfield" projects.