https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45896
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Another testcase from PR 71556:
#include <iostream>
#include <sstream>
#include <locale>
#include <iomanip>
int main()
{
std::tm t = {};
std::istringstream ss("9");
ss.imbue(std::locale("C.UTF-8"));
ss >> std::get_time(&t, "%H");
if (ss.fail()) {
std::cout << "Parse failed\n";
} else {
std::cout << std::put_time(&t, "%c") << '\n';
}
}
