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The __promoted_t alias is only defined when __cpp_fold_expressions is defined, which might not be the case for some hypothetical C++17 compilers. Change the 3-arg std::hypot to just use __gnu_cxx::__promote_3 which is always available. libstdc++-v3/ChangeLog: PR libstdc++/121097 * include/c_global/cmath (hypot): Use __promote_3 instead of __promoted. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>