ev/with-deadline

    macro
    boot.janet on line 3868, column 3

    (ev/with-deadline sec & body)

    Create a fiber to execute `body`, schedule the event loop to cancel 
    the task (root fiber) associated with `body`'s fiber, and start 
    `body`'s fiber by resuming it.

    The event loop will try to cancel the root fiber if `body`'s fiber 
    has not completed after at least `sec` seconds.

    `sec` is a number that can have a fractional part.