diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testNewWithNonNativeProto.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testNewWithNonNativeProto.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function testNewWithNonNativeProto()
+{
+  function f() { }
+  var a = f.prototype = [];
+  for (var i = 0; i < 5; i++)
+    var o = new f();
+  return Object.getPrototypeOf(o) === a && o.splice === Array.prototype.splice;
+}
+assertEq(testNewWithNonNativeProto(), true);