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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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+++ b/js/src/tests/js1_8_1/regress/regress-495773.js
@@ -0,0 +1,42 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 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);
+
+ actual = f();
+
+ reportCompare(expect, actual, summary);
+
+ exitFunc ('test');
+}