diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-191633.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-191633.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* -*- 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/. */
+
+/*
+ *
+ * Date:    03 February 2003
+ * SUMMARY: Testing script with huge number of comments
+ *
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=191633
+ *
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 191633;
+var summary = 'Testing script with huge number of comments';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+
+
+status = inSection(1);
+actual = false; // initialize to failure
+var s = repeat_str("//\n", 40000); // Build a string of 40000 lines of comments
+eval(s + "actual = true;");
+expect = true;
+addThis();
+
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+function repeat_str(str, repeat_count)
+{
+  var arr = new Array(repeat_count);
+
+  while (repeat_count != 0)
+    arr[--repeat_count] = str;
+
+  return str.concat.apply(str, arr);
+}
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = actual;
+  expectedvalues[UBound] = expect;
+  UBound++;
+}
+
+
+function test()
+{
+  enterFunc('test');
+  printBugNumber(BUGNUMBER);
+  printStatus(summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+
+  exitFunc ('test');
+}