One of the cool things about the Rust ownership system is the lease/borrow system. Moving is cool, but much of the time you want to synchronously call another p

One of the cool things about the Rust ownership system is the lease/borrow system. Moving is cool, but much of the time you want to synchronously call another piece of code and give it a temporary (stack-frame-long) lease for that pointer. Rust starts with ownership, but makes it easy to ergonomically and safely lend out that ownership (including one-at-a-time mutable leases) of both stack and heap allocated pointers. I've been programming with Rust since last December, and I have had essentially zero segfaults coming from Rust code during that time frame, roughly equivalent to what I would have expected writing code in a language whose safety guarantees come with a runtime cost (GC or ARC).