michael@0: // Any copyright is dedicated to the Public Domain.
michael@0: // http://creativecommons.org/licenses/publicdomain/
michael@0: 
michael@0: //-----------------------------------------------------------------------------
michael@0: var BUGNUMBER = 548671;
michael@0: var summary =
michael@0:   "Don't use a shared-permanent inherited property to implement " +
michael@0:   "[].length or (function(){}).length";
michael@0: 
michael@0: print(BUGNUMBER + ": " + summary);
michael@0: 
michael@0: /**************
michael@0:  * BEGIN TEST *
michael@0:  **************/
michael@0: 
michael@0: var a = [1, 2, 3];
michael@0: a.__proto__ = null;
michael@0: reportCompare("length" in a, true, "length should be own property of array");
michael@0: reportCompare(Object.hasOwnProperty.call(a, "length"), true,
michael@0:               "length should be own property of array");
michael@0: reportCompare(a.length, 3, "array length should be 3");
michael@0: 
michael@0: var a = [], b = [];
michael@0: b.__proto__ = a;
michael@0: reportCompare(b.hasOwnProperty("length"), true,
michael@0:               "length should be own property of array");
michael@0: b.length = 42;
michael@0: reportCompare(b.length, 42, "should have mutated b's (own) length");
michael@0: reportCompare(a.length, 0, "should not have mutated a's (own) length");
michael@0: 
michael@0: 
michael@0: if (typeof reportCompare === "function")
michael@0:   reportCompare(true, true);
michael@0: 
michael@0: print("All tests passed!");