diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug630865-5.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug630865-5.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+function C(a, b) {
+    this.a = a;
+    this.b = b;
+}
+var f = C.bind(null, 2);
+Object.defineProperty(f, "prototype", {get: function () { throw "FAIL"; }});
+var x;
+for (var i = 0; i < 10; i++)
+    x = new f(i);
+assertEq(toString.call(x), "[object Object]");
+assertEq(Object.getPrototypeOf(x), C.prototype);
+assertEq(x.a, 2);
+assertEq(x.b, 9);