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r16-442 implemented both std::extents and std::dextents (and perhaps other stuff), but exported only std::extents. I went through https://eel.is/c++draft/mdspan.syn and I think std::dextents is the only one implemented but not exported. The following patch exports it, and additionally appends some further entities to the FIXME list, those all seems to be unimplemented yet. 2025-07-20 Jakub Jelinek <jakub@redhat.com> PR libstdc++/121174 * src/c++23/std.cc.in (std::dextents): Export. Add to FIXME comments other not yet implemented nor exported <mdspan> entities.
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