12 	private $affect = array();  variable in MakeNode
19 	public function affect() { return $this->affect; }  function in MakeNode
35 		if ($this->loops != NULL || $this->affect != NULL) return;
48 		$affect = array();
52 			$new_affect = $link->affect();
53 			if ($new_affect) $affect = array_merge($affect, $new_affect);
54 			$affect[] = $link->name();
56 		if ($affect) 
57 			$this->affect = array_keys(array_flip($affect));
58 		else $this->affect = array();
326 			$order = array_merge($order, $node->affect($errors));