diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug531298.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug531298.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+// Binary: cache/js-dbg-32-15c46082297d-linux
+// Flags: -j
+//
+(function() {
+  (eval("\
+    (function() {\
+      let(e)((function() { ((function f(a) {\
+          if (a < 1) {\
+            return 1\
+          }\
+          x = arguments;\
+          return f(a - 1) + f(a - 2)\
+        })(6))\
+      })())\
+    })\
+  "))()
+})()
+gc()