michael@0: function testCallProtoMethod() {
michael@0:     function X() { this.x = 1; }
michael@0:     X.prototype.getName = function () { return "X"; }
michael@0: 
michael@0:     function Y() { this.x = 2; }
michael@0:     Y.prototype.getName = function() "Y";
michael@0: 
michael@0:     var a = [new X, new X, new X, new X, new Y];
michael@0:     var s = '';
michael@0:     for (var i = 0; i < a.length; i++)
michael@0:         s += a[i].getName();
michael@0:     return s;
michael@0: }
michael@0: assertEq(testCallProtoMethod(), 'XXXXY');