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diff --git a/js/src/tests/js1_8_1/regress/regress-495773.js b/js/src/tests/js1_8_1/regress/regress-495773.js
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index 0000000..38b1d19
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+++ b/js/src/tests/js1_8_1/regress/regress-495773.js
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2007
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Dave Mandelin
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+//-----------------------------------------------------------------------------
+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');
+}