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libstdc++-v3/ChangeLog: PR libstdc++/101056 * libsupc++/compare (compare_partial_order_fallback): Add constraint using reversed parameter order, as per LWG 3465. * testsuite/18_support/comparisons/algorithms/fallback.cc: Adjust expected result. (cherry picked from commit b76a529c095f076c4780df0c913cf6d2391bcbc9)