diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug641235.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug641235.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+try {
+function g(code) {
+    code = code.replace(/\/\*DUPTRY\d+\*\//, function(k) {
+        var n = parseInt(k.substr(8), 10);
+        return aa("try{}catch(e){}", n);
+    });
+    var f = new Function(code);
+    f()
+}
+function aa(s, n) {
+    if (n == 1) {
+        return s;
+    }
+    var s2 = s + s;
+    var r = n % 2;
+    var d = (n - r) / 2;
+    var m = aa(s2, d);
+    return r ? m + s : m;
+}
+g("switch(x){default:case l:/*DUPTRY5338*/case 0:x}");
+} catch (e) {}