593     constexpr auto subspan = span.first<0>();  in TEST()  local
600     constexpr auto subspan = span.first<1>();  in TEST()  local
608     constexpr auto subspan = span.first<2>();  in TEST()  local
617     constexpr auto subspan = span.first<3>();  in TEST()  local
632     constexpr auto subspan = span.last<0>();  in TEST()  local
639     constexpr auto subspan = span.last<1>();  in TEST()  local
647     constexpr auto subspan = span.last<2>();  in TEST()  local
656     constexpr auto subspan = span.last<3>();  in TEST()  local
671     constexpr auto subspan = span.subspan<0>();  in TEST()  local
681     constexpr auto subspan = span.subspan<1>();  in TEST()  local
690     constexpr auto subspan = span.subspan<2>();  in TEST()  local
698     constexpr auto subspan = span.subspan<3>();  in TEST()  local
705     constexpr auto subspan = span.subspan<0, 0>();  in TEST()  local
712     constexpr auto subspan = span.subspan<1, 0>();  in TEST()  local
719     constexpr auto subspan = span.subspan<2, 0>();  in TEST()  local
726     constexpr auto subspan = span.subspan<0, 1>();  in TEST()  local
734     constexpr auto subspan = span.subspan<1, 1>();  in TEST()  local
742     constexpr auto subspan = span.subspan<2, 1>();  in TEST()  local
750     constexpr auto subspan = span.subspan<0, 2>();  in TEST()  local
759     constexpr auto subspan = span.subspan<1, 2>();  in TEST()  local
768     constexpr auto subspan = span.subspan<0, 3>();  in TEST()  local
794     auto subspan = span.first<0>();  in TEST()  local
801     auto subspan = span.first<1>();  in TEST()  local
809     auto subspan = span.first<2>();  in TEST()  local
818     auto subspan = span.first<3>();  in TEST()  local
833     auto subspan = span.last<0>();  in TEST()  local
840     auto subspan = span.last<1>();  in TEST()  local
848     auto subspan = span.last<2>();  in TEST()  local
857     auto subspan = span.last<3>();  in TEST()  local
872     auto subspan = span.subspan<0>();  in TEST()  local
882     auto subspan = span.subspan<1>();  in TEST()  local
891     auto subspan = span.subspan<2>();  in TEST()  local
899     auto subspan = span.subspan<3>();  in TEST()  local
906     auto subspan = span.subspan<0, 0>();  in TEST()  local
913     auto subspan = span.subspan<1, 0>();  in TEST()  local
920     auto subspan = span.subspan<2, 0>();  in TEST()  local
927     auto subspan = span.subspan<0, 1>();  in TEST()  local
935     auto subspan = span.subspan<1, 1>();  in TEST()  local
943     auto subspan = span.subspan<2, 1>();  in TEST()  local
951     auto subspan = span.subspan<0, 2>();  in TEST()  local
960     auto subspan = span.subspan<1, 2>();  in TEST()  local
969     auto subspan = span.subspan<0, 3>();  in TEST()  local
984     auto subspan = span.first(0);  in TEST()  local
990     auto subspan = span.first(1);  in TEST()  local
997     auto subspan = span.first(2);  in TEST()  local
1005     auto subspan = span.first(3);  in TEST()  local
1019     auto subspan = span.last(0);  in TEST()  local
1025     auto subspan = span.last(1);  in TEST()  local
1032     auto subspan = span.last(2);  in TEST()  local
1040     auto subspan = span.last(3);  in TEST()  local
1054     auto subspan = span.subspan(0);  in TEST()  local
1063     auto subspan = span.subspan(1);  in TEST()  local
1071     auto subspan = span.subspan(2);  in TEST()  local
1078     auto subspan = span.subspan(3);  in TEST()  local
1084     auto subspan = span.subspan(0, 0);  in TEST()  local
1090     auto subspan = span.subspan(1, 0);  in TEST()  local
1096     auto subspan = span.subspan(2, 0);  in TEST()  local
1102     auto subspan = span.subspan(0, 1);  in TEST()  local
1109     auto subspan = span.subspan(1, 1);  in TEST()  local
1116     auto subspan = span.subspan(2, 1);  in TEST()  local
1123     auto subspan = span.subspan(0, 2);  in TEST()  local
1131     auto subspan = span.subspan(1, 2);  in TEST()  local
1139     auto subspan = span.subspan(0, 3);  in TEST()  local
1500   constexpr span<const int> subspan =  in TEST()  local