1 files changed, 8 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/bug774257-1.js b/js/src/jit-test/tests/ion/bug774257-1.js
new file mode 100644
index 000000000..9c998a028
--- /dev/null
+++ b/js/src/jit-test/tests/ion/bug774257-1.js
@@ -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;
+}