diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug677073-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug677073-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// Don't assert.
+function f0() {
+    var v0;
+    var v1;
+    while (v1) {
+        v1 = v0 + v1;
+        v0 = v1 + v1;
+    }
+    return v0;
+}
+assertEq(f0(), undefined);