[Bug libstdc++/63219] New: Superfluous template parameter in match_result::format overload

[ofv at wanadoo dot es]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63219

            Bug ID: 63219
           Summary: Superfluous template parameter in match_result::format
                    overload
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ofv at wanadoo dot es

This method:

      template<typename _Out_iter, typename _St, typename _Sa>
    basic_string<char_type, _St, _Sa>
    format(const basic_string<char_type, _St, _Sa>& __fmt,
           match_flag_type __flags = regex_constants::format_default) const
    {
      basic_string<char_type, _St, _Sa> __result;
      format(std::back_inserter(__result), __fmt, __flags);
      return __result;
    }

in std::match_results contains "typename _Out_iter", which seems a copy&pasto.
Trying to use this method results on a compile error.