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This test fails if chrono::days::rep or chrono::years::rep is a 32-bit type, because a large days or years value silently overflows a 32-bit integer when converted to seconds. It would be conforming to implement chrono::days as chrono::duration<int32_t, ratio<86400>>, but would make this overflow case more likely. Similarly for chrono::years, chrono::months and chrono::weeks. This test is here to remind us not to make that change lightly. libstdc++-v3/ChangeLog: * testsuite/20_util/duration/arithmetic/overflow_c++20.cc: New test.
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