anchor.diff:              builder: (BuildContext context) {
                 return RaisedButton(
                   onPressed: () {
  -                  Navigator.of(context).push(
  -                    ModifiedReverseTransitionDurationRoute<dynamic>(
  +                  Navigator.of(context).push<void>(
  +                    ModifiedReverseTransitionDurationRoute<void>(
                         builder: (BuildContext innerContext) {
                           return Container(
                             key: containerKey,
  
positive.code:             builder: (BuildContext context) {
                return RaisedButton(
                  onPressed: () {
                    Navigator.of(context).push(
                      MaterialPageRoute<dynamic>(
                        builder: (BuildContext innerContext) {
                          return Container(
                            key: containerKey,
  
negative.code:             builder: (BuildContext context) {
                return RaisedButton(
                  onPressed: () {
                    Navigator.of(context).push<void>(
                      ModifiedReverseTransitionDurationRoute<void>(
                        builder: (BuildContext innerContext) {
                          return Container(
                            key: containerKey,
  