}
	}
	if d == '_' {
		return len(x) - 1
	}

	return -1
}

// scanEscape parses an escape sequence where rune is the accepted
// escaped quote. In case of a syntax error, it stops at the offending
// character (without consuming it) and returns false. Otherwise
// it returns true.
func (s *Scanner) scanEscape(quote rune) bool {
	offs := s.offset

	var n int
	var base, max uint32
	switch s.ch {

	for n > 0 && digitVal(ch) < base {
		ch = s.next()
		n--
	}
	if n > 0 {
		s.error("invalid char escape")
	}
	return ch
}

func (s *Scanner) scanEscape(quote rune) rune {
	ch := s.next() // read character after '/'
	switch ch {
	case 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', quote:
		// nothing to do
		ch = s.next()
	case '0', '1', '2', '3', '4', '5', '6', '7':