OK then! Back to C it is I guess. More seriously, we're talking about the Linux kernel here: it's written in C, and there's some momentum to write new code in Rust. You're asking for the moon, but you may have to settle for a picture of it.
But what TFA talks about amounts to replacing the eBPF verifier with (a blessed userspace version of) the Rust typechecker—dragging the rest of the compiler along for the ride—and that just feels like a downgrade in almost every respect. It’s humongous, it requires strange contortions due to not fitting in the kernel, it implements a comparatively very complicated spec, that spec is not written down, etc. The eBPF machine is not perfect, especially (as the authors point out) when you account for the “helpers“, but it mostly avoids these downsides. It’s not the moon—it’s already there.
Seemless probes across the kernel, libs and user-facing app.
No arrays.
Works for decades, but linux devs thought it they could do better.