# File lib/rdoc/parsers/parse_rb.rb, line 112
  def Token(token, value = nil)
    tk = nil
    case token
    when String, Symbol
      source = token.kind_of?(String) ? TkReading2Token : TkSymbol2Token
      if (tk = source[token]).nil?
        IRB.fail TkReading2TokenNoKey, token
      end
      tk = Token(tk[0], value) 
    else 
      tk = if (token.ancestors & [TkId, TkVal, TkOPASGN, TkUnknownChar]).empty?
             token.new(@prev_line_no, @prev_char_no)
           else
             token.new(@prev_line_no, @prev_char_no, value)
           end
    end
    tk
  end