@classmethod
def from_event(cls, ion_event):
    """Constructs the given native extension from the properties of an event.

        Args:
            ion_event (IonEvent): The event to construct the native value from.
        """
    if ion_event.value is not None:
        args, kwargs = cls._to_constructor_args(ion_event.value)
    else:
        args, kwargs = (), {}
    value = cls(*args, **kwargs)
    value.ion_type = ion_event.ion_type
    value.ion_annotations = ion_event.annotations
    return value
