You can write Assembly in Rust. The point would then be to shut down the usage around it so that you can only do it safely. Of course it won't stop issues but a

You can write Assembly in Rust. The point would then be to shut down the usage around it so that you can only do it safely. Of course it won't stop issues but atleast you know which parts are risky and which aren't. There is also Miri, which allows you to check for Rust code that behaves memory unsafe. And it's also quite possible to writing timing resistant code in Rust. Rust is not as high level as people think, it lets you get right down to the machine level with no issue.