<mdspan>: Require concepts
#3560
Merged
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This PR makes concepts mandatory for
<mdspan>.std::extentsclass,<mdspan>: Implement *Mandates* clauses #3535):extends->extents(obvious typo)static_assertmessages (<mdspan>: Implement *Mandates* clauses #3535 (comment)).I'm going to replace the rest of uses of SFINAE with concepts in follow-up PR.