s = ",M3.2.0,M11.1.0"
	}
	// The TZ definition does not mention ';' here but tzcode accepts it.
	if s[0] != ',' && s[0] != ';' {
		return "", 0, 0, 0, false, false
	}
	s = s[1:]

	var startRule, endRule rule
	startRule, s, ok = tzsetRule(s)
	if !ok || len(s) == 0 || s[0] != ',' {
		return "", 0, 0, 0, false, false
	}
	s = s[1:]
	endRule, s, ok = tzsetRule(s)
	if !ok || len(s) > 0 {