Flutter - How to enable control-flow-collection? - flutter

Question

I'm trying use control-flow-collections in Flutter(Google's UI toolkit) to enable the use of inline for loop, i.e:
for (int i = 0; i < globals.currentScaleList.scales.length; i++)
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
globals.currentScaleList.scales[i].scaleType.toString(),
style: TextStyle(fontSize: 20.0),
),
],
),
], itemExtent: 23.0, onSelectedItemChanged: (index) {}),
I have seen the other questions on the topics in SO and followed all of the instructions that seem to work for others.
I am running Flutter 1.15.4-pre.248 on the Master channel and Dart 2.8.0
Flutter 1.15.4-pre.248 • channel master • https://github.com/flutter/flutter.git
Framework • revision 686d163420 (2 hours ago) • 2020-03-02 16:25:22 -0500
Engine • revision 5e474ee860
Tools • Dart 2.8.0 (build 2.8.0-dev.10.0 fbe9f6115d)
I have created a analysis_options.yaml file in my root app folder and added the following:
analyzer:
enable-experiment:
- control-flow-collections
I have also updated the min version of Dart in my pubspec.yaml, i.e.:
environment:
sdk: ">=2.5.0 <3.0.0"
However, I still get the error against my 'for' loop stating:
"This requires the 'control-flow-collections' experiment to be enabled.
Try enabling this experiment by adding it to the command line when compiling and running."
When I do enable the 3 lines in my analysis_options.yaml file, I get the warning:
"The option 'control-flow-collection' isn't supported by 'enable-experiment'."
What am I missing? Thanks

Answer 1

For those who are facing this issue and have tried creating the analysis_options.yaml, I did what Paul Toal said on the last comment.
Remove analysis_options.yaml (if created)
Run flutter clean command
Restart VSCode
This one worked for me, using the following.
environment:
sdk: ">=2.5.2 <3.0.0"

Answer 2

I had the same issue with the moor_database.g.dart, the Moor generated file. I got it fixed by:
1- Upgrading the sdk constraints with the following
environment:
sdk: ">=2.8.0 <3.0.0"
2- On DartAnalysis in the Android Studio, click on Restart Dart Analysis Server, the first icon button on top left of the DartAnalysis window.
Weird, but worked.