That ChatGPT suggestion is dodgy. Tokio is going to complain when you create a runtime while in async runtime, and refuse block_on in an async context. You can

That ChatGPT suggestion is dodgy. Tokio is going to complain when you create a runtime while in async runtime, and refuse block_on in an async context. You can have multiple runtimes, but create them ahead of time, in synchronous main, and keep a Handle to them. But you probably need: https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html