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The __3way_builtin_ptr_cmp concept can use three_way_comparable_with to check whether <=> is valid. Doing that makes it obvious that the disjunction on compare_three_way::operator() is redundant, because the second constraint subsumes the first. The workaround for PR c++/91073 can also be removed as that bug is fixed now. * libsupc++/compare (__detail::__3way_builtin_ptr_cmp): Use three_way_comparable_with. (__detail::__3way_cmp_with): Remove workaround for fixed bug. (compare_three_way::operator()): Remove redundant constraint from requires-clause. (__detail::_Synth3way::operator()): Use three_way_comparable_with instead of workaround. * testsuite/18_support/comparisons/object/93479.cc: Prune extra output due to simplified constraints on compare_three_way::operator().