703     TEST(subspan)  in SUITE()
709             CHECK((av.subspan<2, 2>().length() == 2));  in SUITE()
710             CHECK(av.subspan(2, 2).length() == 2);  in SUITE()
711             CHECK(av.subspan(2, 3).length() == 3);  in SUITE()
716             CHECK((av.subspan<0, 0>().length() == 0));  in SUITE()
717             CHECK(av.subspan(0, 0).length() == 0);  in SUITE()
722             CHECK((av.subspan<0, 5>().length() == 5));  in SUITE()
723             CHECK(av.subspan(0, 5).length() == 5);  in SUITE()
724             CHECK_THROW(av.subspan(0, 6).length(), fail_fast);  in SUITE()
725             CHECK_THROW(av.subspan(1, 5).length(), fail_fast);  in SUITE()
730             CHECK((av.subspan<4, 0>().length() == 0));  in SUITE()
731             CHECK(av.subspan(4, 0).length() == 0);  in SUITE()
732             CHECK(av.subspan(5, 0).length() == 0);  in SUITE()
733             CHECK_THROW(av.subspan(6, 0).length(), fail_fast);  in SUITE()
738             CHECK((av.subspan<0, 0>().length() == 0));  in SUITE()
739             CHECK(av.subspan(0, 0).length() == 0);  in SUITE()
740             CHECK_THROW((av.subspan<1, 0>().length()), fail_fast);  in SUITE()
745             CHECK(av.subspan(0).length() == 0);  in SUITE()
746             CHECK_THROW(av.subspan(1).length(), fail_fast);  in SUITE()
751             CHECK(av.subspan(0).length() == 5);  in SUITE()
752             CHECK(av.subspan(1).length() == 4);  in SUITE()
753             CHECK(av.subspan(4).length() == 1);  in SUITE()
754             CHECK(av.subspan(5).length() == 0);  in SUITE()
755             CHECK_THROW(av.subspan(6).length(), fail_fast);  in SUITE()
756             auto av2 = av.subspan(1);  in SUITE()
762             CHECK(av.subspan(0).length() == 5);  in SUITE()
763             CHECK(av.subspan(1).length() == 4);  in SUITE()
764             CHECK(av.subspan(4).length() == 1);  in SUITE()
765             CHECK(av.subspan(5).length() == 0);  in SUITE()
766             CHECK_THROW(av.subspan(6).length(), fail_fast);  in SUITE()
767             auto av2 = av.subspan(1);  in SUITE()