title: How do I ask a good question?why is error when use plotshape?
body: <pre><code>var x = '123'
  x := x + '211'
  plotshape(true, style=shape.labelup, color=close&gt;open ?color.green:color.red, text= x, location=location.belowbar)
  </code></pre>
  
  <p>will has error 'line 39: Cannot call <code>plotshape</code> with arguments (literal bool, style=const string, color=series[color], text=string, location=const string); available overloads: plotshape(series[bool], const string, input string, input string, series[color], input integer, series[integer], const string, series[color], const bool, const string, input integer, string) => void; plotshape(fun_arg__, const string, input string, input string, fun_arg__, input integer, series[integer], const string, fun_arg__, const bool, const string, input integer, string) => void'</p>