diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug510655.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug510655.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// This should not crash (or assert in debug builds).
+
+(function () {
+    for (b in [0, 0]) {
+        (eval("\
+            [this\
+                for (b in [\
+                    [undefined],\
+                    arguments,\
+                    [undefined]\
+                ])\
+            ]\
+        "))
+    }
+})()