Really test bug 583429. :-) rs=tpyo

js/src/tests/js1_8_5/regress/regress-583429.js

@@ -2,6 +2,6 @@
 // http://creativecommons.org/licenses/publicdomain/
 // Contributor: Andreas Gal <gal@uci.edu>
 
-assertEq("length" in Object.getOwnPropertyNames(Array.prototype), true);
+assertEq(Object.getOwnPropertyNames(Array.prototype).indexOf("length") >= 0, true);
 
 reportCompare("ok", "ok", "bug 583429");