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--TEST--
Bug #63635 (Segfault in gc_collect_cycles)
--FILE--
<?php
class Node {
	public $parent = NULL;
	public $childs = array();
	
	function __construct(Node $parent=NULL) {
		if ($parent) {
			$parent->childs[] = $this;
		}
		$this->childs[] = $this;
	}
	
	function __destruct() {
		$this->childs = NULL;
	}	
}

define("MAX", 16);

for ($n = 0; $n < 20; $n++) {
	$top = new Node();
	for ($i=0 ; $i<MAX ; $i++) {
		$ci = new Node($top);
		for ($j=0 ; $j<MAX ; $j++) {
			$cj = new Node($ci);
			for ($k=0 ; $k<MAX ; $k++) {
				$ck = new Node($cj);
			}
		}
	}
	echo "$n\n";
}
echo "ok\n";
--EXPECT--
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ok