diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_1/regress/regress-495773.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_1/regress/regress-495773.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 495773;
+var summary = 'Read upvar from trace-entry frame from JSStackFrame instead of tracing native stack';
+var actual = ''
+var expect = '010101';
+//-----------------------------------------------------------------------------
+function f() {
+    var q = [];
+    for (var a = 0; a < 3; ++a) {
+        (function () {
+            for (var b = 0; b < 2; ++b) {
+                (function () {
+                    for (var c = 0; c < 1; ++c) {
+                        q.push(b);
+                    }
+                })();
+            }
+        })();
+    }
+    return q.join("");
+}
+
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  jit(true);
+  actual = f();
+  jit(false);
+
+  reportCompare(expect, actual, summary);
+
+  exitFunc ('test');
+}