diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_2/function/regexparg-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_2/function/regexparg-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,71 @@
+/* -*- 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/. */
+
+
+/**
+   File Name:          regexparg-1.js
+   Description:
+
+   Regression test for
+   http://scopus/bugsplat/show_bug.cgi?id=122787
+   Passing a regular expression as the first constructor argument fails
+
+   Author:             christine@netscape.com
+   Date:               15 June 1998
+*/
+
+var SECTION = "JS_1.2";
+var VERSION = "JS_1.2";
+startTest();
+var TITLE   = "The variable statement";
+
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+print("Note: Bug 61911 changed the behavior of typeof regexp in Gecko 1.9.");
+print("Prior to Gecko 1.9, typeof regexp returned 'function'.");
+print("However in Gecko 1.9 and later, typeof regexp will return 'object'.");
+
+function f(x) {return x;}
+
+x = f(/abc/);
+
+new TestCase( SECTION,
+	      "function f(x) {return x;}; f()",
+	      void 0,
+	      f() );
+
+new TestCase( SECTION,
+	      "f(\"hi\")",
+	      "hi",
+	      f("hi") );
+
+new TestCase( SECTION,
+	      "new f(/abc/) +''",
+	      "/abc/",
+	      new f(/abc/) +"" );
+
+new TestCase( SECTION,
+	      "f(/abc/)+'')",
+	      "/abc/",
+	      f(/abc/) +'');   
+       
+new TestCase( SECTION,
+	      "typeof f(/abc/)",
+	      "object",
+	      typeof f(/abc/) );
+
+new TestCase( SECTION,
+	      "typeof new f(/abc/)",
+	      "object",
+	      typeof new f(/abc/) );
+
+new TestCase( SECTION,
+	      "x = new f(/abc/); x.exec(\"hi\")",
+	      null,
+	      x.exec("hi") );
+
+
+// js> x()
+test();