diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug945294.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug945294.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+// |jit-test| error:is not a function
+var arr = [];
+
+var C = function () {};
+C.prototype.dump = function () {};
+arr[0] = new C;
+
+C = function () {};
+C.prototype.dump = this;
+arr[1] = new C;
+
+function f() {
+    for (var i = 0; i < arr.length; i++)
+        arr[i].dump();
+}
+
+try {
+    f();
+} catch (exc) {
+    assertEq(exc.message.contains("is not a function"), true);
+}
+f();