public function accept(NodeVisitorInterface $visitor)
 {
     if (false !== $visitor->enterStatement($this)) {
         if (false !== $visitor->enterStatementContent($this)) {
             if ($this->hasContent()) {
                 $this->getContent()->accept($visitor);
             }
         }
         $visitor->leaveStatementContent($this);
     }
     $visitor->leaveStatement($this);
 }