diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug737251.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug737251.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+a = {}
+a.getOwnPropertyDescriptor = Array;
+b = Proxy.create(a)
+for (x in this)
+try {
+  (function() {
+    "use strict";
+    b[2] = x // don't assert
+  })()
+} catch (e) {}