anchor.diff:        test("fail1", () {
           var callback = expectAsync0((){});
           return _defer(() {
  -          Timer.run(() {
  +          runAsync(() {
               guardAsync(() {
                 expect(true, false);
                 callback();
  
positive.code:         var callback = expectAsync0((){});
          var excesscallback = expectAsync0((){});
          return _defer(() {
            Timer.run(() {
              guardAsync(() {
                excesscallback();
                excesscallback();
  
negative.code:         var callback = expectAsync0((){});
          var excesscallback = expectAsync0((){});
          return _defer(() {
            runAsync(() {
              guardAsync(() {
                excesscallback();
                excesscallback();
  