diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug774257-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug774257-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+Object.defineProperty(Object.prototype, 'x', { 
+    set: function() { evalcx('lazy'); } 
+});
+var obj = {};
+obj.watch("x", function (id, oldval, newval) {});
+for (var str in 'A') {
+    obj.x = 1;
+}