diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/proxy/bug901979-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/proxy/bug901979-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// A proxy on the prototype chain of the global can't intercept lazy definition of globals.
+// Thanks to André Bargull for this one.
+
+var global = this;
+var status = "pass";
+var handler = {
+  get: function get(t, pk, r) { status = "FAIL get"; },
+  has: function has(t, pk) { status = "FAIL has"; }
+};
+Object.prototype.__proto__ = new Proxy(Object.create(null), handler);
+Map;
+assertEq(status, "pass");