diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug639459.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug639459.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+function f() {
+    var a = [].length;
+    return a / a;
+}
+assertEq(f(), NaN);
+