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from b14209715e6 Set num_threads to 50 on 32-bit hppa in two libgomp loop tests new 87d162383ed libstdc++/pair: Factor out const-assignability helper for C++20 new 65b4cba9d6a libstdc++: Implement P2165R4 changes to std::pair/tuple/etc [...]

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Summary of changes: libstdc++-v3/include/bits/ranges_util.h | 17 +- libstdc++-v3/include/bits/stl_iterator.h | 16 +- libstdc++-v3/include/bits/stl_pair.h | 203 +++++++++++++- libstdc++-v3/include/bits/utility.h | 8 + libstdc++-v3/include/bits/version.def | 8 + libstdc++-v3/include/bits/version.h | 10 + libstdc++-v3/include/std/concepts | 11 +- libstdc++-v3/include/std/map | 1 + libstdc++-v3/include/std/ranges | 48 ++-- libstdc++-v3/include/std/tuple | 325 +++++++++++++++++++---- libstdc++-v3/include/std/unordered_map | 1 + libstdc++-v3/include/std/utility | 1 + libstdc++-v3/testsuite/20_util/pair/p2165r4.cc | 173 ++++++++++++ libstdc++-v3/testsuite/20_util/tuple/p2165r4.cc | 335 ++++++++++++++++++++++++ libstdc++-v3/testsuite/std/ranges/zip/1.cc | 17 +- 15 files changed, 1083 insertions(+), 91 deletions(-) create mode 100644 libstdc++-v3/testsuite/20_util/pair/p2165r4.cc create mode 100644 libstdc++-v3/testsuite/20_util/tuple/p2165r4.cc