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Showing content from https://cplusplus.github.io/LWG/issue3340 below:

Formatting functions should throw on argument/format string mismatch in §[format.functions]

string vformat(string_view fmt, format_args args);
wstring vformat(wstring_view fmt, wformat_args args);
string vformat(const locale& loc, string_view fmt, format_args args);
wstring vformat(const locale& loc, wstring_view fmt, wformat_args args);

-6- […]

-7- Throws: format_error if fmt is not a format string for args.

template<class Out>
  Out vformat_to(Out out, string_view fmt, format_args_t<Out, char> args);
template<class Out>
  Out vformat_to(Out out, wstring_view fmt, format_args_t<Out, wchar_t> args);
template<class Out>
  Out vformat_to(Out out, const locale& loc, string_view fmt,
                 format_args_t<Out, char> args);
template<class Out>
  Out vformat_to(Out out, const locale& loc, wstring_view fmt,
                 format_args_t<Out, wchar_t> args);

[…]

-15- Throws: format_error if fmt is not a format string for args.

template<class Out, class... Args>
  format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
                                      string_view fmt, const Args&... args);
template<class Out, class... Args>
  format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
                                      wstring_view fmt, const Args&... args);
template<class Out, class... Args>
  format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
                                      const locale& loc, string_view fmt,
                                      const Args&... args);
template<class Out, class... Args>
  format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
                                      const locale& loc, wstring_view fmt,
                                      const Args&... args);

[…]

-21- Throws: format_error if fmt is not a format string for args.

template<class... Args>
  size_t formatted_size(string_view fmt, const Args&... args);
template<class... Args>
  size_t formatted_size(wstring_view fmt, const Args&... args);
template<class... Args>
  size_t formatted_size(const locale& loc, string_view fmt, const Args&... args);
template<class... Args>
  size_t formatted_size(const locale& loc, wstring_view fmt, const Args&... args);

[…]

-25- Throws: format_error if fmt is not a format string for args.

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