I don't get why this is noteworthy? It's literally a piece of code in a Rust "unsafe" block. If you put something in an "unsafe" block the compiler isn't going to help you, you are on your own. That's why it's called "unsafe".

Now what is kinda interesting is that instead of getting rid of the "unsafe" block the developers put in some extra check. I guess you can take the developer out of C but you can't take the C out of the developer?