diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug807623.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug807623.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+var objectProxy = Proxy.create({});
+var functionProxy = Proxy.createFunction({}, function() {}, function() {});
+
+assertEq(Object.prototype.toString.call(objectProxy), '[object Object]');
+assertEq(Object.prototype.toString.call(functionProxy), '[object Function]');
+assertEq(Function.prototype.toString.call(functionProxy), 'function () {}');
+try {
+  Function.prototype.toString.call(objectProxy);
+  assertEq(true, false);
+} catch (e) {
+  assertEq(!!/incompatible/.exec(e), true);
+}