Or even dendrite. The Ruma author said on Reddit that they are waiting for async/await to stabilise in Rust before they continue working on Ruma because they'd likely need to rewrite it later if it was written without async from the start.
Yup, I've been following the Rust discussion too. I am quite excited to see this happen -- as someone who tried to wrap their head around tokio two years ago I'm glad something more akin to other languages is around the corner.