I can think of three things off the top of my head:

- Rust doesn’t let you pretend that memory is a flat array of bytes - Single ownership of data can be annoying in some cases - The borrow checker pointing out that you’re trying to do something stupid with pointers (again) can be annoying

Of course, I’m of the opinion that the hassles are worth it, especially the borrow checker. Almost every time I have to fight the borrow checker, it’s because I haven’t thought properly about the pointers involved and tried to do something stupid.