Crash when compiling after making a code change to a Flutter application that uses Dart 3 and records

[maxluchterhand1]

Hey,

we have a Flutter project that's on Dart 3. We were originally on the Flutter beta channel but switched to the Master after we had some issues with compiling.

Flutter 3.9.0-13.0.pre.3 • channel master • https://github.com/flutter/flutter.gitdd-assets ±✚  ets ±✚  
Framework • revision 5804c12323 (28 hours ago) • 2023-03-21 02:58:27 -0400
Engine • revision 1b289e20c2
Tools • Dart 3.0.0 (build 3.0.0-348.0.dev) • DevTools 2.22.2

We are using the following experimental features:
- sealed-class
- patterns
- records
- class-modifiers

Now we find ourselves in a situation where we cannot compile our application after making changes to certain files, although we are yet to figure out a pattern as to which files are affected. The error message is always the same:

Unhandled exception:
Crash when compiling file:///....../body_chart_anatomy_preview.dart at character offset 941:
Not implemented

#0      TypeBuilderComputer.visitRecordType (package:front_end/src/fasta/kernel/type_builder_computer.dart:197:5)
#1      RecordType.accept (package:kernel/ast.dart:13385:14)
#2      TypeBuilderComputer.visitInterfaceType.<anonymous closure> (package:front_end/src/fasta/kernel/type_builder_computer.dart:101:65)
#3      new _List.generate (dart:core-patch/array.dart:112:28)
#4      TypeBuilderComputer.visitInterfaceType (package:front_end/src/fasta/kernel/type_builder_computer.dart:100:23)
#5      InterfaceType.accept (package:kernel/ast.dart:12085:42)
#6      DillLoader.computeTypeBuilder (package:front_end/src/fasta/dill/dill_loader.dart:345:17)
#7      computeTypeBuilder (package:front_end/src/fasta/dill/dill_class_builder.dart:248:24)

This is the file in question:

import 'package:evalu_rehab/assessment/domain/assessment_result.dart';
import 'package:evalu_rehab/assessment/presentation/assessments/body_chart/body_chart_anatomy_data_point_stack.dart';
import 'package:evalu_rehab/assessment/presentation/assessments/body_chart/body_chart_anatomy_detail_view.dart';
import 'package:evalu_rehab/assessment/state/body_chart/body_chart_cubit.dart';
import 'package:evalu_rehab/assets/assets.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class BodyChartAnatomyPreview extends StatelessWidget {
  const BodyChartAnatomyPreview({super.key});

  String _assetName(BodyChartAngle angle) {
    switch (angle) {
      case BodyChartAngle.front: return Assets.bodyAnatomy.front;
      case BodyChartAngle.back: return Assets.bodyAnatomy.back;
      case BodyChartAngle.side: return Assets.bodyAnatomy.side;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        for (final value in [
          BodyChartAngle.front,
          BodyChartAngle.side,              <------------
          BodyChartAngle.back,
        ])
          Expanded(
            child: GestureDetector(
              onTap: () {
                showDialog(
                  context: context,
                  builder: (_) => BlocProvider.value(
                    value: context.read<BodyChartCubit>(),
                    child: BodyChartAnatomyDetailView(
                      bodyChartAngle: value,
                    ),
                  ),
                );
              },
              child: BodyChartAnatomyDataPointStack(
                anatomyView: Image.asset(_assetName(value)),
                bodyChartAngle: value,
              ),
            ),
          ),
      ],
    );
  }
}

The change I made to the file in order to cause the problem was simply changing the order of elements in the list at which I pointed with the arrow in the code sample. The only way to get the app to compile again is either reverting the change or running flutter clean.

This issue seems to me like this has to have already been noticed by someone. However, I could not find any issue here or over at Flutter's GitHub.

[bernaferrari]

I've been waiting this for months. Thanks for reporting!!

[MostafaDadkhah]

I have this issue after add records to project.