Function supervisable 

pub fn supervisable<T>(worker: T) -> ChildBuilder<'static, Restartable>
where
    T: Supervisable + 'static,

Creates a builder for a supervisable child task on the ambient supervisor.

The ambient counterpart to SupervisorHandle::supervisable, which documents what a supervisable task is.

Panics

ChildBuilder::spawn panics if there is no ambient supervisor. See spawn.