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diff --git a/js/src/tests/non262/extensions/regress-50447-1.js b/js/src/tests/non262/extensions/regress-50447-1.js
new file mode 100644
index 0000000000..6af94b9a19
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+++ b/js/src/tests/non262/extensions/regress-50447-1.js
@@ -0,0 +1,179 @@
+/* -*- tab-width: 8; indent-tabs-mode: nil; js-indent-level: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+
+/*
+ * SUMMARY: New properties fileName, lineNumber have been added to Error objects
+ * in SpiderMonkey. These are non-ECMA extensions and do not exist in Rhino.
+ *
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=50447
+ *
+ * 2005-04-05 Modified by bclary to support changes to error reporting
+ *            which set default values for the error's fileName and
+ *            lineNumber properties.
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 50447;
+var summary = 'Test (non-ECMA) Error object properties fileName, lineNumber';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+function test()
+{
+
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  testRealError();
+  test1();
+  test2();
+  test3();
+  test4();
+
+
+}
+
+// Normalize filenames so this test can work on Windows. This 
+// function is also used on strings that contain filenames.
+function normalize(filename)
+{
+    // Also convert double-backslash to single-slash to handle
+    // escaped filenames in string literals.
+    return filename.replace(/\\{1,2}/g, '/');
+}
+
+function testRealError()
+{
+  /* throw a real error, and see what it looks like */
+
+
+  try
+  {
+    blabla;
+  }
+  catch (e)
+  {
+    if (e.fileName.search (/-50447-1\.js$/i) == -1)
+      reportCompare('PASS', 'FAIL', "expected fileName to end with '-50447-1.js'");
+
+    reportCompare(60, e.lineNumber,
+		  "lineNumber property returned unexpected value.");
+  }
+
+
+}
+
+
+function test1()
+{
+  /* generate an error with msg, file, and lineno properties */
+
+
+  var e = new InternalError ("msg", "file", 2);
+  if (Error.prototype.toSource) {
+    reportCompare ("(new InternalError(\"msg\", \"file\", 2))",
+  		 e.toSource(),
+  		 "toSource() returned unexpected result.");
+  }
+  reportCompare ("file", e.fileName,
+		 "fileName property returned unexpected value.");
+  reportCompare (2, e.lineNumber,
+		 "lineNumber property returned unexpected value.");
+
+
+}
+
+
+function test2()
+{
+  /* generate an error with only msg property */
+
+
+  /* note this test incorporates the path to the
+     test file and assumes the path to the test case
+     is a subdirectory of the directory containing jsDriver.pl
+  */
+  var expectedLine = 108;
+  var expectedFileName = 'non262/extensions/regress-50447-1.js';
+  var expectedSource = /\(new InternalError\("msg", "([^"]+)", ([0-9]+)\)\)/;
+
+  var e = new InternalError ("msg");
+
+  if (Error.prototype.toSource) {
+    var actual = expectedSource.exec(e.toSource());
+    reportCompare (normalize(actual[1]).endsWith(expectedFileName), true,
+  		 "toSource() returned unexpected result (filename).");
+    reportCompare (actual[2], String(expectedLine),
+  		 "toSource() returned unexpected result (line).");
+  }
+  reportCompare (normalize(e.fileName).endsWith(expectedFileName), true,
+		 "fileName property returned unexpected value.");
+  reportCompare (expectedLine, e.lineNumber,
+		 "lineNumber property returned unexpected value.");
+
+
+}
+
+
+function test3()
+{
+  /* generate an error with only msg and lineNo properties */
+
+  /* note this test incorporates the path to the
+     test file and assumes the path to the test case
+     is a subdirectory of the directory containing jsDriver.pl
+  */
+
+
+
+  var expectedLine = 10;
+  var expectedFileName = 'non262/extensions/regress-50447-1.js';
+  var expectedSource = /\(new InternalError\("msg", "([^"]+)", ([0-9]+)\)\)/;
+
+  var e = new InternalError ("msg");
+  e.lineNumber = expectedLine;
+
+  if (Error.prototype.toSource) {
+    var actual = expectedSource.exec(e.toSource());
+    reportCompare (normalize(actual[1]).endsWith(expectedFileName), true,
+  		 "toSource() returned unexpected result (filename).");
+    reportCompare (actual[2], String(expectedLine),
+  		 "toSource() returned unexpected result (line).");
+  }
+  reportCompare (normalize(e.fileName).endsWith(expectedFileName), true,
+		 "fileName property returned unexpected value.");
+  reportCompare (expectedLine, e.lineNumber,
+		 "lineNumber property returned unexpected value.");
+
+
+}
+
+
+function test4()
+{
+  /* generate an error with only msg and filename properties */
+
+
+  var expectedLine = 167;
+
+  var e = new InternalError ("msg", "file");
+  if (Error.prototype.toSource) {
+    reportCompare ("(new InternalError(\"msg\", \"file\", " + expectedLine + "))",
+  		 e.toSource(),
+  		 "toSource() returned unexpected result.");
+  }
+  reportCompare ("file", e.fileName,
+		 "fileName property returned unexpected value.");
+  reportCompare (expectedLine, e.lineNumber,
+		 "lineNumber property returned unexpected value.");
+
+
+}