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Final `mdspan` test fixes#3954

Merged

StephanTLavavej merged 13 commits intomicrosoft:feature/mdspan2from

StephanTLavavej:final-mdspan-test-fixes

Aug 12, 2023

Commits on Aug 12, 2023

Include `<utility>` for `make_index_sequence`.
StephanTLavavej
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Use `bool` underlying types when we call `to_underlying()` later.
StephanTLavavej
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`Mdspan` => `mdspan` in comments.
StephanTLavavej
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Rename an `array` from `s` to `a`.
StephanTLavavej
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Mark `ActionTracker` observers as `[[nodiscard]]`.
StephanTLavavej
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Use `M1` typedef. Rename `m2` => `m1` to avoid looking weird.
StephanTLavavej
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Extract `Mapping` typedef, like the block immediately above, and the `layout_right` test.
StephanTLavavej
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`LyingLayout` inherits from `layout_left::mapping<Extents>`; use that for `is_always_exhaustive()`.
StephanTLavavej
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Drop repeated line; `span<int>` is inherently symmetry-breaking here.
StephanTLavavej
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Construct `layout_stride::mapping` without an extra `span`, matching `P0009R18_mdspan_layout_right`.
StephanTLavavej
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In `P0009R18_mdspan_layout_right`, `check_construction_from_other_right_mapping()` was missing "Check effects", while `check_construction_from_other_left_mapping()` was testing `layout_right::mappi…
StephanTLavavej
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Test how comparisons are guaranteed to be `noexcept`.
StephanTLavavej
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Fix tangled tests in P0009R18_mdspan_extents_death.
StephanTLavavej
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