diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug770407.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug770407.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+// |jit-test| error:TypeError
+var otherGlobal = newGlobal();
+var proxy = otherGlobal.Proxy.create({}, {});
+Int8Array.set(proxy);