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<utility>formake_index_sequence.boolunderlying types when we callto_underlying()later.Mdspan=>mdspanin comments.arrayfromstoa.ActionTrackerobservers as[[nodiscard]].M1typedef. Renamem2=>m1to avoid looking weird.Mappingtypedef, like the block immediately above, and thelayout_righttest.LyingLayoutinherits fromlayout_left::mapping<Extents>; use that foris_always_exhaustive().span<int>is inherently symmetry-breaking here.layout_stride::mappingwithout an extraspan, matchingP0009R18_mdspan_layout_right.P0009R18_mdspan_layout_right,check_construction_from_other_right_mapping()was missing "Check effects", whilecheck_construction_from_other_left_mapping()was testinglayout_right::mappingas the source.noexcept.test_construction_from_[span/array]_with_invalid_values():other.extent(r)=>exts[r]test_construction_from_span_with_unrepresentable_as_index_type_values()andtest_construction_from_array_with_invalid_values()were tangled up.