Async #Rust is actually awesome! 
The last few days I've built a prototype(!) of a global "Hotkey" system e.g.:
Press & Hold LCtrl + Space
=> an async stream starts and only finishes if:
- another key is pressed or
- one of the Hotkeys is released
If it is not clear by now: this is a state-machine, which fits perfectly into Rust's #async model!
And the best part: This is actually the first time I've ever touched async #RustLang! Such a pleasant experience!
1/?