Function spawn_local 

pub fn spawn_local<F>(future: F)
where
    F: Future<Output = ()> + 'static,

Runs a Rust Future on the current thread.

The future must be 'static because it will be scheduled to run in the background and cannot contain any stack references.

The future will always be run on the next microtask tick even if it immediately returns Poll::Ready.

Panics

This function has the same panic behavior as future_to_promise.