def find_backref_chain(obj, predicate, max_depth=20, extra_ignore=()):
    return _find_chain(obj, predicate, gc.get_referrers,
                       max_depth=max_depth, extra_ignore=extra_ignore)
Ensure that jobs scheduled the future are not queued.
dataset/ETHPy150Open Exa-Networks/exabgp/lib/exabgp/dep/objgraph.py/find_backref_chain--crossover with--dataset/ETHPy150Open ui/rq-scheduler/tests/test_scheduler.py/TestScheduler.test_get_jobs_to_queue