27         using LG = std::scoped_lock<>;  in main()  typedef
28         LG lg1, lg2;  in main()
32         using LG = std::scoped_lock<M>;  in main()  typedef
33         LG lg1(m0);  in main()
34         LG lg2(om0);  in main()
38         using LG = std::scoped_lock<M, M>;  in main()  typedef
39         LG lg1(m0, m1);  in main()
40         LG lg2(om0, om1);  in main()
44         using LG = std::scoped_lock<M, M, M>;  in main()  typedef
45         LG lg1(m0, m1, m2);  in main()
46         LG lg2(om0, om1, om2);  in main()