Comment by unscaled

Runtime borrow checking panics if you use the non-try version, and if you're careful enough to use try_borrow() you don't even have to panic. Unlike Go, this can never result in a data race.

If you're using unsafe blocks you can have data races too, but that's the entire point of unsafe. FWIW, my experience is that most Rust developers never reach for unsafe in their life. Parts of the Rust ecosystem do heavily rely on unsafe blocks, but this still heavily limits their impact to (usually) well-reviewed code. The entire idea is that unsafe is NOT the default in Rust.