diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-275378.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-275378.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+/* -*- 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/. */
+
+//-----------------------------------------------------------------------------
+// testcase by Martin Zvieger <martin.zvieger@sphinx.at>
+// if fails, will fail to run in browser due to syntax error
+var BUGNUMBER = 275378;
+var summary = 'Literal RegExp in case block should not give syntax error';
+var actual = '';
+var expect = '';
+
+var status;
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+
+var tmpString= "XYZ";
+// works
+/ABC/.test(tmpString);
+var tmpVal= 1;
+if (tmpVal == 1)
+{
+  // works
+  /ABC/.test(tmpString);
+}
+switch(tmpVal)
+{
+case 1:
+{
+  // works
+  /ABC/.test(tmpString);
+}
+break;
+}
+switch(tmpVal)
+{
+case 1:
+  // fails with syntax error
+  /ABC/.test(tmpString);
+  break;
+}
+
+expect = actual = 'no error';
+reportCompare(expect, actual, status);