diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_5/regress/regress-592556-c35.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_5/regress/regress-592556-c35.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+// Contributor: Jason Orendorff <jorendorff@mozilla.com>
+
+var obj = {a: 0, b: 1, c: 2};
+delete obj.b;  // switch to dictionary mode
+Object.defineProperty(obj, 'g',
+                      {get: function () { return -1; }, configurable: true});
+for (var i = 3; i < 20; i++)
+    obj['x' + i] = i;  // get property table
+for (var i = 3; i < 20; i++)
+    delete obj['x' + i];  // add to freelist
+delete obj.g;  // must update lastProp->freeslot, to avoid assertion
+
+// extra junk to try to hit the assertion, if freeslot is not updated
+gc();
+obj.d = 3;
+obj.e = 4;
+
+reportCompare(0, 0, 'ok');