public function output()
 {
     $argumentsCode = "";
     if ($this->arguments !== null) {
         $arguments = $this->arguments->output();
         $argumentsCode = $arguments[0];
     }
     $called = $this->called->output();
     $called = $called[0];
     $codeLines = [$called . '.' . $this->functionName . '(' . $argumentsCode . ')'];
     return $codeLines;
 }