diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug697255.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug697255.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// Binary: cache/js-dbg-32-6cd262091470-linux
+// Flags: -j
+//
+a = evalcx("lazy");
+b = {}
+b.__proto__ = a
+a.__proto__ = String
+for (var a = 0; a < 50; a++) {
+    try {
+        b + ""
+    } catch (e) {}
+}