[Bug libstdc++/121174] std::dextents was not exported from std module

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121174

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
            Summary|std::dextents was not       |std::dextents was not
                   |found, which prevented      |exported from std module
                   |std::mdspan from specifying |
                   |dimensions at runtime       |
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2025-07-19

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This works:
```

#include <mdspan>

int main() {

    int v[] = {1, 2, 3, 4, 5, 6};

    std::mdspan<int, std::dextents<std::size_t, 2>> view{v, 2, 3};

    return 0;
}
```

So it looks like dextents is not exported from the std module.

extents is exported but not dextents.