diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_5/regress/regress-633741.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_5/regress/regress-633741.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+// |reftest| skip
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributors: Jan de Mooij
+ */
+
+Object.preventExtensions(this);
+delete Function;
+
+try {
+    /* Don't assert. */
+    Object.getOwnPropertyNames(this);
+} catch(e) {
+    reportCompare(true, false, "this shouldn't have thrown");
+}
+reportCompare(0, 0, "ok");
+