> A signal handler will catch the bus error in userspace. Sure, but what I meant is that most of the time userspace programs have nothing interesting they can

> A signal handler will catch the bus error in userspace. Sure, but what I meant is that most of the time userspace programs have nothing interesting they can do with the bus error (and, as I noted, standard C does not actually provide this option anyway). Regardless there are existing signal handling libraries that aren't that hard to use in Rust (you now describe one in your post), so I'm not sure why you're pointing to that as "something... that Rust lacks." There's no way I'm aware of that setjmp / longjmp could possibly be integrated with safe Rust, but I agree that they should be available to unsafe code (in a way that doesn't require invoking llvm intrinsics).