s.graph()->AddControlEdge(constant.node(), variable.node());
}

void CreateSubgraphNotTouchingRefVar(const Scope& s) {
  Output constant =
      ops::Const(s.WithOpName("constant_normal"), Input::Initializer(0.0));
  Output neg = ops::Negate(s.WithOpName("negate_normal"), constant);
  Output add = ops::Add(s.WithOpName("add_normal"), neg, neg);
}

        << "All nodes apart from source and sink can access reference variable";
  }
}

void CreateSubgraphNotTouchingRefVar(const Scope& s) {
  Output constant =
      ops::Const(s.WithOpName("constant_normal"), Input::Initializer(0.0));
  Output neg = ops::Negate(s.WithOpName("negate_normal"), constant);
  Output add = ops::Add(s.WithOpName("add_normal"), neg, neg);
}