michael@0: 
michael@0: function testUnaryImacros() {
michael@0:     function checkArg(x) {
michael@0:         o = {
michael@0:             valueOf: checkArg
michael@0:         }
michael@0:     }
michael@0:     var v = 0;
michael@0:     v += +toString;
michael@0:     for (var i = 0; i;) {
michael@0:         v += [].checkArg.checkArg;
michael@0:     }
michael@0: }(testUnaryImacros(), "valueOf passed, toString passed");