Function supervisable 

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

Creates a builder for a supervisable child task of the current process.

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

Panics

ChildBuilder::spawn panics if it is called outside supervision. See spawn.