diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-261887.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-261887.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+// |reftest| skip -- we violate the spec here with our new iterators
+/* -*- 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 from Oscar Fogelberg <osfo@home.se>
+var BUGNUMBER = 261887;
+var summary = 'deleted properties should not be visited by for in';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+var count = 0;
+var result = "";
+var value = "";
+
+var t = new Object();
+t.one = "one";
+t.two = "two";
+t.three = "three";
+t.four = "four";
+   
+for (var prop in t) {
+  if (count==1) delete(t.three);
+  count++;
+  value = value + t[prop];
+  result = result + prop;
+}
+ 
+expect = 'onetwofour:onetwofour';
+actual = value + ':' + result;
+
+reportCompare(expect, actual, summary);