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inline internal::FormatState string_format(std::string& s, const char* format) HZ_FUNC_PRINTF_CHECK(2, 0);
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inline internal::FormatState string_format(std::string& s, const char* format) HZ_FUNC_STRING_SPRINTF_CHECK(2, 0);
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inline internal::FormatState string_format(std::string& s, const std::string& format);