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This concept was added by a C++23 proposal, so don't define it for C++20. Split the format/formatter/formatter.cc test into two parts, one that tests the C++20 requirements and one that tests the C++23 concept. libstdc++-v3/ChangeLog: * include/std/format (formattable): Only define for C++23/ * testsuite/std/format/formatter.cc: Moved to... * testsuite/std/format/formatter/requirements.cc: ...here. * testsuite/std/format/formatter/concept.cc: New test. * testsuite/std/format/functions/format.cc: Replace use of std::formattable in C++20.
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