public function enterNode(PHPParser_Node $node)
 {
     if (!$this->lineRange->isInRange($node->getLine())) {
         return;
     }
     $parent = $node->getAttribute('parent');
     // TODO: Expensive (?)
     do {
         if ($parent && $this->statements->contains($parent)) {
             return;
         }
     } while ($parent && ($parent = $parent->getAttribute('parent')));
     $this->statements->attach($node);
 }