diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug945512.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug945512.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+
+var handler = {
+    has: function (name) {
+        assertEq(1, 2);
+    }
+};
+
+for (var i=0; i<10; i++) {
+    var regex = /undefined/;
+    regex.__proto__ = Proxy.createFunction(handler, function(){})
+}
+