diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_6/Proxy/regress-bug950407.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_6/Proxy/regress-bug950407.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+var ab = new ArrayBuffer(5);
+var p = new Proxy(ab, {});
+var ps = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__").set;
+var threw = 0;
+try {
+    ps.call(p, {});
+} catch(ex) {
+    threw = 1;
+}
+
+reportCompare(1, threw, "Setting __proto__ on a proxy to an ArrayBuffer must throw.");