Calling a sync function from an async when using the tokio executor is literally documented as a thing you should not do. Furthermore if you want to then spawn

Calling a sync function from an async when using the tokio executor is literally documented as a thing you should not do. Furthermore if you want to then spawn a task or whatever it's called, which is the documented way to do this safely, then you have to capture with static lifetime. That is a hard guarantee to provide for sufficiently complex code! Rust is definitely colored, and it's not as simple as just spawning an executor