diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug728509.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug728509.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// Binary: cache/js-dbg-32-78fde7e54d92-linux
+// Flags: -m -n -a
+//
+function g(code) {
+    try {
+        f = eval("(function(){" + code + "})")
+    } catch (r) {}
+    f()
+    try {
+        evalcx("(function(){return" + code + "})()")
+    } catch (e) {}
+}
+g("")
+g(" function(x,[]){NaN.x::c}()")