diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testDeepPropertyShadowing.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testDeepPropertyShadowing.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+function testDeepPropertyShadowing()
+{
+    function h(node) {
+        var x = 0;
+        while (node) {
+            x++;
+            node = node.parent;
+        }
+        return x;
+    }
+    var tree = {__proto__: {__proto__: {parent: null}}};
+    h(tree);
+    h(tree);
+    tree.parent = {};
+    assertEq(h(tree), 2);
+}
+testDeepPropertyShadowing();