def selected_leaf
import bendvy-ecs-core@0.1.0.4/ordinary_event_family.bend as OrdinaryEventFamilyimport Base
import event_stream.bend as Leaf
99def selected_leaf(~S:Data,~E:Data,stream:Leaf.Stream<S,E>) -> Leaf.Stream<S,E> & Leaf.Stream<S,E>:
100 +retained=stream
101 (retained,retained)