diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug520498.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug520498.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+var Q = 0;
+try {
+   (function f(i) { Q = i; if (i == 100000) return; f(i+1); })(1)
+} catch (e) {
+}
+
+if (Q == 100000)
+   assertEq(Q, "fail");
+