rem: var ns = new Namespace(); 
add: var ns = new Namespace(); 
context: function prepare_list(N){    var head = {};    var cursor = head;    for (var i = 0; i != N; ++i) {        var ns = new Namespace();          var x = <xml/>;        x.addNamespace(ns);        cursor.next = x;        cursor = ns;    }    return head;}
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/0b675418ba636127763e94e614e62364d6caa659/regress-280844-2.js/buggy/js/tests/e4x/GC/regress-280844-2.js