101     constexpr std::string_view sv2 = sv1.substr ( 0, 3 );  in main()  local
102     static_assert ( sv2.size() == 3, "" );  in main()
103     static_assert ( sv2[0] == 'A', "" );  in main()
104     static_assert ( sv2[1] == 'B', "" );  in main()
105     static_assert ( sv2[2] == 'C', "" );  in main()
109     constexpr std::string_view sv2 = sv1.substr ( 3, 0 );  in main()  local
110     static_assert ( sv2.size() == 0, "" );  in main()
114     constexpr std::string_view sv2 = sv1.substr ( 3, 3 );  in main()  local
115     static_assert ( sv2.size() == 2, "" );  in main()
116     static_assert ( sv2[0] == 'D', "" );  in main()
117     static_assert ( sv2[1] == 'E', "" );  in main()