445 constexpr errc inv_arg = errc::invalid_argument;  variable
451         test_from_chars<T>("", base, 0, inv_arg); // no characters  in test_integer_from_chars()
452         test_from_chars<T>("@1", base, 0, inv_arg); // '@' is bogus  in test_integer_from_chars()
453         test_from_chars<T>(".1", base, 0, inv_arg); // '.' is bogus, for integers  in test_integer_from_chars()
454 … test_from_chars<T>("+1", base, 0, inv_arg); // '+' is bogus, N4713 23.20.3 [charconv.from.chars]/3  in test_integer_from_chars()
456 …     test_from_chars<T>(" 1", base, 0, inv_arg); // ' ' is bogus, no whitespace in subject sequence  in test_integer_from_chars()
459             test_from_chars<T>("-1", base, 0, inv_arg); // "and only if value has a signed type"  in test_integer_from_chars()
464         test_from_chars<T>("-", base, 0, inv_arg); // '-' followed by no characters  in test_integer_from_chars()
465         test_from_chars<T>("-@1", base, 0, inv_arg); // '-' followed by bogus '@'  in test_integer_from_chars()
466         test_from_chars<T>("-.1", base, 0, inv_arg); // '-' followed by bogus '.'  in test_integer_from_chars()
467         test_from_chars<T>("-+1", base, 0, inv_arg); // '-' followed by bogus '+'  in test_integer_from_chars()
468         test_from_chars<T>("- 1", base, 0, inv_arg); // '-' followed by bogus ' '  in test_integer_from_chars()
469         test_from_chars<T>("--1", base, 0, inv_arg); // '-' can't be repeated  in test_integer_from_chars()
481             test_from_chars<T>(bogus + "1"s, base, 0, inv_arg); // bogus digit (for this base)  in test_integer_from_chars()
482 …          test_from_chars<T>("-"s + bogus + "1"s, base, 0, inv_arg); // '-' followed by bogus digit  in test_integer_from_chars()
815     test_from_chars<T>("", fmt, 0, inv_arg); // no characters
816     test_from_chars<T>("@1", fmt, 0, inv_arg); // '@' is bogus
817     test_from_chars<T>("z1", fmt, 0, inv_arg); // 'z' is bogus
818     test_from_chars<T>(".", fmt, 0, inv_arg); // '.' without digits is bogus
819     test_from_chars<T>("+1", fmt, 0, inv_arg); // '+' is bogus
820     test_from_chars<T>(" 1", fmt, 0, inv_arg); // ' ' is bogus
821     test_from_chars<T>("p5", fmt, 0, inv_arg); // binary-exponent-part without digits is bogus
822     test_from_chars<T>("in", fmt, 0, inv_arg); // incomplete inf is bogus
823     test_from_chars<T>("na", fmt, 0, inv_arg); // incomplete nan is bogus
825     test_from_chars<T>("-", fmt, 0, inv_arg); // '-' followed by no characters
826     test_from_chars<T>("-@1", fmt, 0, inv_arg); // '-' followed by bogus '@'
827     test_from_chars<T>("-z1", fmt, 0, inv_arg); // '-' followed by bogus 'z'
828     test_from_chars<T>("-.", fmt, 0, inv_arg); // '-' followed by bogus '.'
829     test_from_chars<T>("-+1", fmt, 0, inv_arg); // '-' followed by bogus '+'
830     test_from_chars<T>("- 1", fmt, 0, inv_arg); // '-' followed by bogus ' '
831     test_from_chars<T>("-p5", fmt, 0, inv_arg); // '-' followed by bogus binary-exponent-part
832     test_from_chars<T>("-in", fmt, 0, inv_arg); // '-' followed by bogus incomplete inf
833     test_from_chars<T>("-na", fmt, 0, inv_arg); // '-' followed by bogus incomplete nan
834     test_from_chars<T>("--1", fmt, 0, inv_arg); // '-' can't be repeated
837         test_from_chars<T>("e5", fmt, 0, inv_arg); // exponent-part without digits is bogus
838         test_from_chars<T>("-e5", fmt, 0, inv_arg); // '-' followed by bogus exponent-part
923         test_from_chars<T>("1729", fmt, 0, inv_arg);