michael@0: function f(a, b, c) {
michael@0:     this.a = a;
michael@0:     assertEq(b, 'x');
michael@0:     assertEq(c, void 0);
michael@0: }
michael@0: 
michael@0: for (var x = 0; x < 9; ++x) {
michael@0:     f.prototype = {};
michael@0:     var obj = new f(x, 'x');  // fewer than f.length arguments
michael@0:     assertEq(obj.a, x);
michael@0:     assertEq(Object.getPrototypeOf(obj), f.prototype);
michael@0: }