diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testMissingMethod2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testMissingMethod2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+var o = {y: function() {}};
+var a = [o, o, o, o, o, o, o, o, o];
+Number.prototype.y = 0;
+a[7] = 0;
+try {
+    for (var i = 0; i < 9; i++)
+        a[i].y();
+} catch (exc) {
+    assertEq(exc.name, "TypeError"); // should happen when i == 7
+}