def get_children(self, **kwargs):
        return []
Return any varnodes that share the same source. (this is a no-no)
dataset/ETHPy150Open goFrendiAsgard/kokoropy/kokoropy/packages/sqlalchemy/sql/elements.py/ClauseElement.get_children--crossover with--dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/depgraph.py/CollapsedGraph._get_duped_varnodes