// extract comment text
	if text[1] == '*' {
		text = text[:len(text)-2] // lop off trailing "*/"
	}
	text = text[7:] // lop off leading "//line " or "/*line "
	offs += 7

	i, n, ok := trailingDigits(text)
	if i == 0 {
		return // ignore (not a line directive)
	}
	// i > 0

	if !ok {
		// text has a suffix :xxx but xxx is not a number
		s.error(offs+i, "invalid line number: "+string(text[i:]))