Linus Torvalds Speaks on the the divide between Rust and C Linux developers an the future Linux. Will things like fragmentation among the open source community hurt the Linux Kernel? We’ll listen to the Creator of Linux.
For the full key note, checkout: Keynote: Linus Torvalds in Conversation with Dirk Hohndel
The Register’s summary: Torvalds weighs in on ‘nasty’ Rust vs C for Linux debate
So probably there will be some systems other than Linux that do use Rust.
Isn’t there Redox OS?
Edit: yes, it’s still alive and kicking.