diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Exceptions/regress-257751.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Exceptions/regress-257751.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,92 @@
+/* -*- 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/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 257751;
+var summary = 'RegExp Syntax Errors should have lineNumber and fileName';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+var status;
+var re;
+
+status = summary + ' ' + inSection(1) + ' RegExp("\\\\") ';
+try
+{
+  expect = 'Pass';
+  re = RegExp('\\');
+}
+catch(e)
+{
+  if (e.fileName && e.lineNumber)
+  {
+    actual = 'Pass';
+  }
+  else
+  {
+    actual = 'Fail';
+  }
+}
+reportCompare(expect, actual, status);
+
+status = summary + ' ' + inSection(2) + ' RegExp(")") ';
+try
+{
+  expect = 'Pass';
+  re = RegExp(')');
+}
+catch(e)
+{
+  if (e.fileName && e.lineNumber)
+  {
+    actual = 'Pass';
+  }
+  else
+  {
+    actual = 'Fail';
+  }
+}
+reportCompare(expect, actual, status);
+
+status = summary + ' ' + inSection(3) + ' /\\\\/ ';
+try
+{
+  expect = 'Pass';
+  re = eval('/\\/');
+}
+catch(e)
+{
+  if (e.fileName && e.lineNumber)
+  {
+    actual = 'Pass';
+  }
+  else
+  {
+    actual = 'Fail';
+  }
+}
+reportCompare(expect, actual, status);
+
+status = summary + ' ' + inSection(4) + ' /)/ ';
+try
+{
+  expect = 'Pass';
+  re = eval('/)/');
+}
+catch(e)
+{
+  if (e.fileName && e.lineNumber)
+  {
+    actual = 'Pass';
+  }
+  else
+  {
+    actual = 'Fail';
+  }
+}
+reportCompare(expect, actual, status);