Rust does not have undefined behaviours in the sense of C. C and C++ are rather unique in the very large amount of undefined behaviour that is in common use. A

Rust does not have undefined behaviours in the sense of C. C and C++ are rather unique in the very large amount of undefined behaviour that is in common use. A nice comment pcwalton https://news.ycombinator.com/item?id=7601944 https://news.ycombinator.com/item?id=7601944 gives a better explanation than I can. The undefined behaviour in C is in my opinion a bad design that unfortunately poisoned a whole lot of software for minor gains in speed somewhere. A mistake that did not need to have become popular but for chance in history.