cluster_size_ += other->cluster_size_;
  effective_cluster_size_ += other->effective_cluster_size_;
  has_functional_control_flow_ |= other->has_functional_control_flow_;

  devices_.UnionWith(other->devices_);

  DCHECK(!(resource_op_device_.has_value() &&
           other->resource_op_device_.has_value()) ||
         *resource_op_device_ == *other->resource_op_device_)