1 files changed, 10 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/bug774257-2.js b/js/src/jit-test/tests/ion/bug774257-2.js
new file mode 100644
index 000000000..b31043b08
--- /dev/null
+++ b/js/src/jit-test/tests/ion/bug774257-2.js
@@ -0,0 +1,10 @@
+Object.defineProperty(Object.prototype, 'x', { 
+    set: function() { evalcx('lazy'); } 
+});
+var obj = {};
+var prot = {};
+obj.__proto__ = prot;
+obj.watch("x", function (id, oldval, newval) {});
+for (var str in 'A') {
+    obj.x = 1;
+}