libstdc++: Fix test that fails for C++20
Also restore the test for 'a < a' that was removed by r12-2537 because it is ill-formed. We still want to test operator< for tuple, we just need to not use std::nullptr_t in that tuple type. libstdc++-v3/ChangeLog: * testsuite/20_util/tuple/comparison_operators/overloaded.cc: Restore test for operator<. * testsuite/20_util/tuple/comparison_operators/overloaded2.cc: Adjust expected errors for C++20.
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@ -48,3 +48,9 @@ TwistedLogic operator<(const Compares&, const Compares&) { return {false}; }
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auto a = std::make_tuple(nullptr, Compares{}, 2, 'U');
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auto a = std::make_tuple(nullptr, Compares{}, 2, 'U');
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auto b = a == a;
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auto b = a == a;
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#if ! __cpp_lib_three_way_comparison
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// Not valid in C++20, because TwistedLogic doesn't model boolean-testable.
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auto c = std::make_tuple("", Compares{}, 2, 'U');
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auto d = c < c;
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#endif
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@ -49,5 +49,7 @@ TwistedLogic operator<(const Compares&, const Compares&) { return {false}; }
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auto a = std::make_tuple(nullptr, Compares{}, 2, 'U');
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auto a = std::make_tuple(nullptr, Compares{}, 2, 'U');
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auto b = a < a;
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auto b = a < a;
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// { dg-error "ordered comparison" "" { target *-*-* } 0 }
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// { dg-error "no match for 'operator<'" "" { target c++20 } 0 }
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// { dg-error "no match for .*_Synth3way|in requirements" "" { target c++20 } 0 }
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// { dg-error "ordered comparison" "" { target c++17_down } 0 }
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// { dg-error "not a return-statement" "" { target c++11_only } 0 }
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// { dg-error "not a return-statement" "" { target c++11_only } 0 }
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