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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=393974
+-->
+<head>
+ <title>Test for Bug 393974</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=393974">Mozilla Bug 393974</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+function test()
+{
+ // Create a tree walker with a filter which creates a cycle...
+ var tw = document.createTreeWalker(document, NodeFilter.SHOW_ALL,
+ function(n)
+ {
+ // force the closure to contain the
+ // global object, in case a future
+ // optimization might minimize the
+ // function's captured environment
+ if ("foo" + window == "fooPIRATES!")
+ return NodeFilter.FILTER_ACCEPT;
+ return NodeFilter.FILTER_REJECT;
+ });
+
+ // That should have been enough to create a leak, but we should do at least
+ // a couple tests while we're here so that this document doesn't show up as
+ // having no tests pass *or* fail.
+
+ ok(tw.firstChild() === null, "shouldn't be a first child");
+ ok(tw.currentNode === document, "should be unchanged");
+
+ ok(tw.lastChild() === null, "shouldn't be a last child");
+ ok(tw.currentNode === document, "should be unchanged");
+
+ ok(tw.nextNode() === null, "shouldn't be a next node");
+ ok(tw.currentNode === document, "should be unchanged");
+
+ ok(tw.nextSibling() === null, "shouldn't be a next sibling");
+ ok(tw.currentNode === document, "should be unchanged");
+
+ ok(tw.parentNode() === null, "shouldn't be a parent node");
+ ok(tw.currentNode === document, "should be unchanged");
+
+ ok(tw.previousNode() === null, "shouldn't be a previous node");
+ ok(tw.currentNode === document, "should be unchanged");
+
+ ok(tw.previousSibling() === null, "shouldn't be a previous sibling");
+ ok(tw.currentNode === document, "should be unchanged");
+}
+
+addLoadEvent(test);
+addLoadEvent(SimpleTest.finish);
+</script>
+</pre>
+</body>
+</html>