Compiler crash: Iterables do not have same length

[burekas7]

Flutter 3.13.2 environment: sdk: '>=3.1.0 <4.0.0'

---

After a specific dio 'post' call I'm getting this error:

Unhandled exception:
Invalid argument(s): Iterables do not have same length.
#0      MapBase._fillMapWithIterables (dart:collection/maps.dart:178:7)
#1      new LinkedHashMap.fromIterables (dart:collection/linked_hash_map.dart:246:13)
#2      Substitution.fromPairs (package:kernel/type_algebra.dart:263:13)
#3      InferenceVisitorBase.getGetterTypeForMemberTarget (package:front_end/src/fasta/type_inference/inference_visitor_base.dart:1465:35)
#4      InstanceAccessTarget.getGetterType (package:front_end/src/fasta/type_inference/object_access_target.dart:489:30)
#5      InferenceVisitorImpl._computePropertyGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:6663:36)
#6      InferenceVisitorImpl.visitPropertyGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:7672:61)
#7      PropertyGet.acceptInference (package:front_end/src/fasta/kernel/internal_ast.dart:2984:20)

#8      InferenceVisitorImpl._inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:257:27)
#9      InferenceVisitorImpl.inferNullAwareExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:310:40)
#10     InferenceVisitorImpl.visitIndexGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:5227:48)
#11     IndexGet.acceptInference (package:front_end/src/fasta/kernel/internal_ast.dart:1824:20)
#12     InferenceVisitorImpl._inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:257:27)
#13     InferenceVisitorImpl.inferNullAwareExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:310:40)
#14     InferenceVisitorImpl.visitIndexGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:5227:48)
#15     IndexGet.acceptInference (package:front_end/src/fasta/kernel/internal_ast.dart:1824:20)
#16     InferenceVisitorImpl._inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:257:27)
#17     InferenceVisitorImpl.inferNullAwareExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:310:40)
#18     InferenceVisitorImpl.visitIndexGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:5227:48)
#19     IndexGet.acceptInference (package:front_end/src/fasta/kernel/internal_ast.dart:1824:20)
#20     InferenceVisitorImpl._inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:257:27)
#21     InferenceVisitorImpl.inferNullAwareExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:310:40)
#22     InferenceVisitorImpl.visitIndexGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:5227:48)
#23     IndexGet.acceptInference (package:front_end/src/fasta/kernel/internal_ast.dart:1824:20)
#24     InferenceVisitorImpl._inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:257:27)
#25     InferenceVisitorImpl.inferNullAwareExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:310:40)
#26     InferenceVisitorImpl.visitIndexGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:5227:48)
#27     IndexGet.acceptInference (package:front_end/src/fasta/kernel/internal_ast.dart:1824:20)
#28     InferenceVisitorImpl._inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:257:27)
#29     InferenceVisitorImpl.inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:291:40)
#30     InferenceVisitorImpl.visitReturnStatement (package:front_end/src/fasta/type_inference/inference_visitor.dart:7894:11)
#31     ReturnStatement.accept (package:kernel/ast.dart:10127:43)
#32     InferenceVisitorImpl.inferStatement (package:front_end/src/fasta/type_inference/inference_visitor.dart:242:26)
#33     TypeInferrerImpl.inferFunctionBody (package:front_end/src/fasta/type_inference/type_inferrer.dart:198:17)
#34     BodyBuilder.parseSingleExpression (package:front_end/src/fasta/kernel/body_builder.dart:1780:62)
#35     SourceLoader.buildExpression (package:front_end/src/fasta/source/source_loader.dart:1320:21)
<asynchronous suspension>
#36     IncrementalCompiler.compileExpression.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:2033:39)
<asynchronous suspension>
#37     IncrementalCompiler.compileExpression (package:front_end/src/fasta/incremental_compiler.dart:1853:12)
<asynchronous suspension>
#38     FrontendCompiler.compileExpression (package:frontend_server/frontend_server.dart:981:28)

<asynchronous suspension>
#39     listenAndCompile.<anonymous closure> (package:frontend_server/frontend_server.dart:1452:11)
<asynchronous suspension>

3
the Dart compiler exited unexpectedly.
Exited (1)

[johnniwinther]

@burekas7 Did this happen when evaluation an explicit expression during debugging or when hovering expressions in the editor? Also was this part of a hot-reload cycle (i.e. was the code "recently" modified) ?

[heshesh2010]

+1 , got same error when hovering on the expressions in VS CODE editor , using Dio package to debug the responses .

sdk: ">=2.19.2 <4.0.0"

flutter doctor `Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, 3.13.2, on macOS 13.5 22G74 darwin-x64, locale en-EG) [✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0) [✓] Xcode - develop for iOS and macOS (Xcode 14.3.1) [✓] Chrome - develop for the web [✓] Android Studio (version 2022.2) [✓] VS Code (version 1.81.1) [✓] Connected device (3 available) [✓] Network resources

• No issues found!`

[johnniwinther]

@heshesh2010 Do you have any idea what expression was?

[ChaserVasya]

same

[cmdrKhonan]

+1 here having a similar issue :

     List<List<int>> l = List.generate(list.length, (index) => []);
     List<dynamic> guide = [
       {
         "field": null,
         "nextList": null,
         "selection": l,
         "max_selected": 1000,
       }
     ];

this generate a debugger crash :

Unhandled exception:
Invalid argument(s): Iterables do not have same length.
#0      MapBase._fillMapWithIterables (dart:collection/maps.dart:178:7)
#1      new LinkedHashMap.fromIterables (dart:collection/linked_hash_map.dart:246:13)
#2      Substitution.fromPairs (package:kernel/type_algebra.dart:263:13)
#3      InferenceVisitorBase.getGetterTypeForMemberTarget (package:front_end/src/fasta/type_inference/inference_visitor_base.dart:1465:35)

[johnniwinther]

This seems to originate from a bad encoding of the arguments passed to the expression compiler - at least I can recreate the crash by creating such a bad message. I'm still not still sure the where in the tool chain this encoding is created, though.

Likely related to https://github.com/dart-lang/sdk/issues/53382

[johnniwinther]

cc @jensjoha

[johnniwinther]

@jensjoha @mraleph Can we be sure that a raw type of a generic class in the VM has the right number of types arguments? I.e. could the VM be creating the encoding ["dart:core", "List", "1", "0"] for List in CollectStringifiedType ?

[mraleph]

@johnniwinther I think they should have correct length. Type object in the VM should carry TAV which matches the number of type parameters the class has (cc @alexmarkov)

However the code in CollectStringifiedType is a bit suspicious - it does not seem to handle raw types (e.g. List<dynamic>) correctly. VM used to denote those using null TAV and CollectStringifiedType does not seem to handle that at all. Maybe we can try to reproduce by trying expression compilation in a context with a variable which has a raw type, e.g. final v = <dynamic>[] and see if it blows up?

[mraleph]

Yeah it reproduces quite trivially with the following test:

Regression test

```dart import 'dart:developer'; import 'package:observatory/models.dart' show InstanceKind; import 'package:observatory/service_io.dart'; import 'package:test/test.dart'; import 'service_test_common.dart'; import 'test_helper.dart'; void testFunction() { List v = [1, 2, '3']; debugger(); print("v = $v"); } var tests = [ hasStoppedAtBreakpoint, (Isolate isolate) async { final result = await isolate.evalFrame(0, '''v.length'''); print(result); final instance = result as Instance; expect(instance.valueAsString, equals('3')); expect(instance.kind, equals(InstanceKind.int)); }, ]; main(args) => runIsolateTests(args, tests, testeeConcurrent: testFunction); ```

And if I put RELEASE_ASSERT(!srcArguments.IsNull()); it triggers. The fix should be fairly trivial - just handle this case. I can patch it up.

[RickZzDev]

In my case i was having this problem using for each to desserialize a json response that was inside a list, when a change it to a "for in" it stopped to crash

[burekas7]

Does anyone know if this bug was fixed? Because I see this issue is closed.

Should I need to update the dart sdk version?

@mraleph @johnniwinther

[johnniwinther]

The issue has been fixed in the Dart repository and is available in the lastest dev release. It will be in the the next beta and stable releases.

[shawnAshton]

@johnniwinther I see you said this 3 weeks ago, so I made sure to update to new flutter & dart versions released after your comment.

(@mraleph tagging you as you authored the fix 3 weeks ago)

I still experience this issue with these updates that were released sept 27th (about 2 weeks after your comment). flutter: 3.13.6 dart: 3.1.3 environment: sdk: '>=3.1.3 <4.0.0'

Unhandled exception:
Invalid argument(s): Iterables do not have same length.
#0      MapBase._fillMapWithIterables (dart:collection/maps.dart:178:7)
#1      new LinkedHashMap.fromIterables (dart:collection/linked_hash_map.dart:246:13)
#2      Substitution.fromPairs (package:kernel/type_algebra.dart:263:13)
#3      InferenceVisitorBase.getGetterTypeForMemberTarget (package:front_end/src/fasta/type_inference/inference_visitor_base.dart:1465:35)
#5      InferenceVisitorImpl._computePropertyGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:6663:36)
#4      InstanceAccessTarget.getGetterType (package:front_end/src/fasta/type_inference/object_access_target.dart:489:30)
#6      InferenceVisitorImpl.visitPropertyGet (package:front_end/src/fasta/type_inference/inference_visitor.dart:7672:61)
#7      PropertyGet.acceptInference (package:front_end/src/fasta/kernel/internal_ast.dart:2984:20)
#8      InferenceVisitorImpl._inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:257:27)
#9      InferenceVisitorImpl.inferExpression (package:front_end/src/fasta/type_inference/inference_visitor.dart:291:40)
#10     InferenceVisitorImpl.visitReturnStatement (package:front_end/src/fasta/type_inference/inference_visitor.dart:7894:11)
#11     ReturnStatement.accept (package:kernel/ast.dart:10127:43)

#12     InferenceVisitorImpl.inferStatement (package:front_end/src/fasta/type_inference/inference_visitor.dart:242:26)
#13     TypeInferrerImpl.inferFunctionBody (package:front_end/src/fasta/type_inference/type_inferrer.dart:198:17)
#14     BodyBuilder.parseSingleExpression (package:front_end/src/fasta/kernel/body_builder.dart:1780:62)
#15     SourceLoader.buildExpression (package:front_end/src/fasta/source/source_loader.dart:1320:21)
<asynchronous suspension>
#16     IncrementalCompiler.compileExpression.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:2033:39)
<asynchronous suspension>
#17     IncrementalCompiler.compileExpression (package:front_end/src/fasta/incremental_compiler.dart:1853:12)
<asynchronous suspension>
#18     FrontendCompiler.compileExpression (package:frontend_server/frontend_server.dart:981:28)
<asynchronous suspension>
#19     listenAndCompile.<anonymous closure> (package:frontend_server/frontend_server.dart:1452:11)
<asynchronous suspension>

[jensjoha]

It seems you're on flutter stable meaning you don't get the dev releases of dart.

[shawnAshton]

It seems you're on flutter stable meaning you don't get the dev releases of dart.

As was mentioned above, It will be in the the next beta and stable releases.. I do see that that doesn't specify which next stable release though...

[mraleph]

@shawnAshton next stable release means Dart 3.2.

[kashiflab]

It seems you're on flutter stable meaning you don't get the dev releases of dart.

As was mentioned above, It will be in the next beta and stable releases.. I do see that that doesn't specify which next stable release though...

@shawnAshton @mraleph Please push the latest release on the stable branch. I am stuck nothing is working, my timelines are disturbed because of this error.

[burekas7]

@kashiflab Agree. It is completely difficult to debug api calls like this, I put a breakpoint and a few seconds later it crashes the application and debug.

When the stable release with the fix will be ready for use? @mraleph @johnniwinther

[mraleph]

Stable release is in the final rounds of testing and preparations for release. You could switch to Flutter beta channel if you want the fix already today.

[gabrielgiovans]

I bring good news guys, today I was looking for the problem and came across this topic. The new version of flutter (3.16.0) released yesterday has fixed the problem.