def parse_numkan
      s0 = @current_pos
      s1 = match_regexp(/^[一二三四五六七八九]/)
      if s1 != :failed
        @reported_pos = s0
        s1 = kan2n(s1)
      end
      s1
    end
def parse_numkan
      s0 = @current_pos
      s1 = match_regexp(/^[一二三四五六七八九]/)
      if s1 != :failed
        @reported_pos = s0
        s1 = kan2n(s1)
      end
      s1
    end
numkan : [一二三四五六七八九]