diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/getprop-idempotent-cache-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/getprop-idempotent-cache-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+function f(o) {
+    var res = 0;
+    for (var i=0; i<110; i++) {
+        res += o.x;
+    }
+    return res;
+}
+
+function O(x) {
+    if ([].length == 0) // Thwart definite slot analysis.
+        this.x = 10;
+}
+
+var o = new O(true);
+f(o);
+
+// Add a getter, this should invalidate the script containing the idempotent cache.
+var res = 0;
+o.__defineGetter__("x", function() { res++; });
+f(o);
+assertEq(res, 110);