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This implements the C++23 change "Poison Pills are Too Toxic". This makes sense to do unconditionally for C++20, as the corner cases that it fixes are considered to be defects in the C++20 design (e.g. LWG3480 was needed to fix directory iterators because of these pills being too toxic). libstdc++-v3/ChangeLog: * include/bits/iterator_concepts.h (__imove::iter_move): Define poison pill as deleted for consistency. (__access::begin): Replace with a single declaration. * include/bits/ranges_base.h (__access::end, __access::rbegin) (__access::rend, __access::size): Likewise. * include/bits/version.def (ranges): Update value for C++23. * include/bits/version.h: Regenerate. * libsupc++/compare (__compare): Add missing poison pill overloads. * testsuite/std/ranges/version_c++23.cc: Adjust expected value of __cpp_lib_ranges. * testsuite/std/ranges/access/p2602.cc: New test.
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