I just totally disagree. Swift might look a bit more like C#, but in terms of features it's way more similar to Rust for all the ADT-related features mentioned

I just totally disagree. Swift might look a bit more like C#, but in terms of features it's way more similar to Rust for all the ADT-related features mentioned in the grandparent comment. Also, regarding memory safety, it's not as safe as Rust - it's basically only memory-safe in the single-threaded context, but it's still relatively safe compared to other languages. I don't really find it easier to crash than Rust - thanks to optionals you get the same guarantees against NPE's. You can choose not to take advantage of it, but you can also force-unwrap in Rust if you want.