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diff --git a/js/src/tests/non262/regress/regress-203841.js b/js/src/tests/non262/regress/regress-203841.js
new file mode 100644
index 0000000000..022bf537fc
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+++ b/js/src/tests/non262/regress/regress-203841.js
@@ -0,0 +1,127 @@
+/* -*- 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/. */
+
+/*
+ *
+ * Date:    29 April 2003
+ * SUMMARY: Testing merged if-clauses
+ *
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=203841
+ *
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 203841;
+var summary = 'Testing merged if-clauses';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+
+
+status = inSection(1);
+var a = 0;
+var b = 0;
+var c = 0;
+if (a == 5, b == 6) { c = 1; }
+actual = c;
+expect = 0;
+addThis();
+
+status = inSection(2);
+a = 5;
+b = 0;
+c = 0;
+if (a == 5, b == 6) { c = 1; }
+actual = c;
+expect = 0;
+addThis();
+
+status = inSection(3);
+a = 5;
+b = 6;
+c = 0;
+if (a == 5, b == 6) { c = 1; }
+actual = c;
+expect = 1;
+addThis();
+
+/*
+ * Now get tricky and use the = operator inside the if-clause
+ */
+status = inSection(4);
+a = 0;
+b = 6;
+c = 0;
+if (a = 5, b == 6) { c = 1; }
+actual = c;
+expect = 1;
+addThis();
+
+status = inSection(5);
+c = 0;
+if (1, 1 == 6) { c = 1; }
+actual = c;
+expect = 0;
+addThis();
+
+
+/*
+ * Now some tests involving arrays
+ */
+var x=[];
+
+status = inSection(6); // get element case
+c = 0;
+if (x[1==2]) { c = 1; }
+actual = c;
+expect = 0;
+addThis();
+
+status = inSection(7); // set element case
+c = 0;
+if (x[1==2]=1) { c = 1; }
+actual = c;
+expect = 1;
+addThis();
+
+status = inSection(8); // delete element case
+c = 0;
+if (delete x[1==2]) { c = 1; }
+actual = c;
+expect = 1;
+addThis();
+
+
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = actual;
+  expectedvalues[UBound] = expect;
+  UBound++;
+}
+
+
+function test()
+{
+  printBugNumber(BUGNUMBER);
+  printStatus(summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+}