diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug489836.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug489836.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// Binary: cache/js-dbg-32-1a1611bb1063-linux
+// Flags: -j
+//
+var e;
+function w(f, y) {
+    e = 2 * f;
+    for (var i = 0; i < 1; i++) {
+    }
+}
+for (var u = 0; u < 4; ++u) {
+    w(undefined, 0);
+    w(1, (2) * 2);
+}