join doesn't work with nested replacement fields

[peterbell10]

Running the following results in FormatError("unmatched '}' in format string") being thrown.

float test[10]{};
fmt::format("{0:.{1}f}", fmt::join(std::begin(test), std::end(test), ", "), 2);

This happens because ArgJoin's format_arg only advances the format string past the first '}' leaving "f}" to be formatted.

fmt/fmt/format.h

Lines 4116 to 4117 in c719d94

	while (*end && *end != '}')
	++end;

[vitaut]

Good catch, thanks! Fixed in 6822466.