if (e->src()->IsNextIteration()) {
          back_edges_.push_back(
              BackEdge{e, e->src(), e->src_output(), e->dst(), e->dst_input()});
        }
      }
    }
  }
  for (const BackEdge& be : back_edges_) {
    graph_->RemoveEdge(be.edge);
  }
  return absl::OkStatus();
}

const std::vector<BackEdgeHelper::BackEdge>& BackEdgeHelper::RemovedEdges()
    const {
  return back_edges_;
}

    result[i] = outputs[i].node();
  }
  return result;
}

// Manually generates the name of the `loop_var_idx`-th NextIteration node of a
// loop being constructed with `scope`. This is used to define the backedge
// before the NextIteration node is created.
string NextIterationName(const Scope& scope, int loop_var_idx) {
  string result;
  const string& prefix = scope.impl()->name();