title: php spreadsheets Parse error: syntax error, unexpected '.', expecting '&' or variable (T_VARIABLE)
body: <p>I have installed phpspreadsheets with composer using command line(back to medieval era..). Now, I have some errors after I have included the phpspreadsheets  library in my project:</p>
  
  <p>Parse error: syntax error, unexpected '.', expecting '&amp;' or variable (T_VARIABLE) in ..../application/libraries/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Engine/Logger.php on line 93</p>
  
  <p>So, in Logger.php on line 93 the code is:</p>
  
  <pre><code>public function writeDebugLog(...$args)
  </code></pre>
  
  <p>Has anyone dealt with such issue ? it's so annoying, it took forever to install composer and run install stpreadsheets from command line and now this error...(and the fact that I have to use command line it's killing me) </p>