michael@0: function f(del) {
michael@0:     o = arguments;
michael@0:     if (del)
michael@0:         delete o[2];
michael@0:     for (var i = 0; i < 10; ++i)
michael@0:         assertEq(o[2] == undefined, del);
michael@0: }
michael@0: 
michael@0: // record without arg deleted
michael@0: f(false, 1,2,3,4);
michael@0: 
michael@0: // run with arg deleted
michael@0: f(true, 1,2,3,4);