diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testProxyConstructors.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testProxyConstructors.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+// |jit-test| error: ExitCleanly
+
+assertEq((new (Proxy.createFunction({},
+                                    function(){ this.x = 1 },
+                                    function(){ this.x = 2 }))).x, 2);
+try {
+    x = Proxy.createFunction((function () {}), Uint16Array, wrap)
+    new(wrap(x))
+    throw "Should not be reached"
+}
+catch (e) {
+    assertEq(String(e.message).indexOf('is not a constructor') === -1, false);
+}
+// proxies can return the callee
+var x = Proxy.createFunction({}, function (q) { return q; });
+assertEq(new x(x), x);
+try {
+    var x = (Proxy.createFunction({}, "".indexOf));
+    new x;
+    throw "Should not be reached"
+}
+catch (e) {
+    assertEq(String(e.message).indexOf('is not a constructor') === -1, false);
+}
+throw "ExitCleanly"