diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/saved-stacks/getters-on-invalid-objects.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/saved-stacks/getters-on-invalid-objects.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+// Test that you can't call the SavedFrame constructor and can only use
+// SavedFrame's getters on SavedFrame instances.
+
+load(libdir + "asserts.js");
+
+let proto = Object.getPrototypeOf(saveStack());
+
+// Can't create new SavedFrame instances by hand.
+assertThrowsInstanceOf(() => {
+  new proto.constructor();
+}, TypeError);
+
+for (let p of ["source", "line", "column", "functionDisplayName", "parent"]) {
+  // The getters shouldn't work on the prototype.
+  assertThrowsInstanceOf(() => proto[p], TypeError);
+
+  // Nor should they work on random objects.
+  let o = {};
+  Object.defineProperty(o, p, Object.getOwnPropertyDescriptor(proto, p));
+  assertThrowsInstanceOf(() => o[p], TypeError);
+}