def _all_arcs(self):
        arcs = set()
        for bp in self.child_parsers():
            arcs.update(bp._arcs())

        return arcs
Get the set of all arcs in this code object and its children.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/coverage/parser.py/ByteParser._all_arcs