It's funny how frequent people bring this up, but the truth is simple, check here [1]. Zircon kernel is not new [2], it has been in development for a while now. By the time the started to work on the microkernel, Rust 1.0 was really new, so they would've to implement several things from ground up. There's a implementation of Zircon in rust called zCore [3], but I don't know how stable and feature complete this one is. [1] twitter.com/cpugoogle/status/1397265884… [2] Like a two years project. [3] github.com/rcore-os/zCore

"why wasn't Zircon written in Rust": twitter.com/cpuGoogle/status/1397265884…...

Related: > Our kernel, Zircon, [is not in Rust](twitter.com/cpuGoogle/status/1397265884…). Not yet anyway. But it is in [a nice, lean subset of C++](fuchsia.dev/fuchsia-src/development/lan…...) which I consider a vast improvement over C. blog.cr0.org/2021/06/a-few-thoughts-on…...