791     TEST(subspan)  in SUITE()
797             CHECK((av.subspan<2, 2>().bounds() == static_bounds<2>()));  in SUITE()
798             CHECK((av.subspan<2, 2>().length() == 2));  in SUITE()
799             CHECK(av.subspan(2, 2).length() == 2);  in SUITE()
800             CHECK(av.subspan(2, 3).length() == 3);  in SUITE()
805             CHECK((av.subspan<0, 0>().bounds() == static_bounds<0>()));  in SUITE()
806             CHECK((av.subspan<0, 0>().length() == 0));  in SUITE()
807             CHECK(av.subspan(0, 0).length() == 0);  in SUITE()
812             CHECK((av.subspan<0, 5>().bounds() == static_bounds<5>()));  in SUITE()
813             CHECK((av.subspan<0, 5>().length() == 5));  in SUITE()
814             CHECK(av.subspan(0, 5).length() == 5);  in SUITE()
815             CHECK_THROW(av.subspan(0, 6).length(), fail_fast);  in SUITE()
816             CHECK_THROW(av.subspan(1, 5).length(), fail_fast);  in SUITE()
821             CHECK((av.subspan<5, 0>().bounds() == static_bounds<0>()));  in SUITE()
822             CHECK((av.subspan<5, 0>().length() == 0));  in SUITE()
823             CHECK(av.subspan(5, 0).length() == 0);  in SUITE()
824             CHECK_THROW(av.subspan(6, 0).length(), fail_fast);  in SUITE()
829             CHECK((av.subspan<0, 0>().bounds() == static_bounds<0>()));  in SUITE()
830             CHECK((av.subspan<0, 0>().length() == 0));  in SUITE()
831             CHECK(av.subspan(0, 0).length() == 0);  in SUITE()
832             CHECK_THROW((av.subspan<1, 0>().length()), fail_fast);  in SUITE()
837             CHECK(av.subspan(0).length() == 0);  in SUITE()
838             CHECK_THROW(av.subspan(1).length(), fail_fast);  in SUITE()
843             CHECK(av.subspan(0).length() == 5);  in SUITE()
844             CHECK(av.subspan(1).length() == 4);  in SUITE()
845             CHECK(av.subspan(4).length() == 1);  in SUITE()
846             CHECK(av.subspan(5).length() == 0);  in SUITE()
847             CHECK_THROW(av.subspan(6).length(), fail_fast);  in SUITE()
848             auto av2 = av.subspan(1);  in SUITE()
854             CHECK(av.subspan(0).length() == 5);  in SUITE()
855             CHECK(av.subspan(1).length() == 4);  in SUITE()
856             CHECK(av.subspan(4).length() == 1);  in SUITE()
857             CHECK(av.subspan(5).length() == 0);  in SUITE()
858             CHECK_THROW(av.subspan(6).length(), fail_fast);  in SUITE()
859             auto av2 = av.subspan(1);  in SUITE()