dst = GetOrAddFrameNodeId(frame_name);
        dst_type = "frame";
      }

      if (edge->src()->IsExit()) {
        // Lift edges from an "Exit" node to the corresponding frame node.
        const string& frame_name =
            control_flow_info[edge->src()->id()].frame_name;
        src = GetOrAddFrameNodeId(frame_name);
        src_type = "frame";
      }