diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug727330.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug727330.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// |jit-test| error:TypeError
+
+// Binary: cache/js-dbg-64-ff51ddfdf5d1-linux
+// Flags:
+//
+var a = [];
+for (var i = 0; i < 200; ++i) a.push({});
+var p = Proxy.create({fix: function() { return a; }});
+Object.preventExtensions(p);