Dart analysis issue with Android Studio (Flutter 3.27.3, Dart 3.6.1) #60683

Sakari369 · 2025-05-07T06:31:56Z

I'm having an issue inside Android Studio, not sure if this related to dart analyzer or not, but in Android Studio when I switch between .dart files and have Dart analyzer enabled, Android Studio always throws this error:

Dart Analysis Issue
UnimplementedError

The error shows this

`

Dart analysis issue

UnimplementedError

Version information

Dart SDK 3.6.1
Dart IntelliJ 243.26753.1
Android Studio Meerkat Feature Drop | 2024.3.2
Mac OS X 14.6.1

Details

UnimplementedError
#0 ElementImpl2.enclosingElement2 (package:analyzer/src/dart/element/element.dart:3106:38)
#1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15 #16 #17 #18 #19 #20 #21 #22 #23 #24 #25 #26 #27 #28 #29 #30 #31 #32 #33 #34 #35 #36 #37 #38 #39 #40 #41 #42 #43 #44 #45 #46 #47 #48 #49 #50 #51 #52 #53 #54 #55 #56 #57 #58 #59 #60 #61 #62
#63
#64
#65
#66
#67
#68
#69 _ReferenceFinder.visitAssignmentExpression (package:analysis_server/src/services/correction/dart/import_add_show.dart:71:51)
AssignmentExpressionImpl.accept (package:analyzer/src/dart/ast/ast.dart:954:15)
ExpressionStatementImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:6366:17)
RecursiveAstVisitor.visitExpressionStatement (package:analyzer/dart/ast/visitor.dart:1099:10)
ExpressionStatementImpl.accept (package:analyzer/src/dart/ast/ast.dart:6362:50)
NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13009:20)
SwitchPatternCaseImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:17380:16)
RecursiveAstVisitor.visitSwitchPatternCase (package:analyzer/dart/ast/visitor.dart:1740:10)
SwitchPatternCaseImpl.accept (package:analyzer/src/dart/ast/ast.dart:17374:50)
NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13009:20)
SwitchStatementImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:17497:14)
RecursiveAstVisitor.visitSwitchStatement (package:analyzer/dart/ast/visitor.dart:1746:10)
SwitchStatementImpl.accept (package:analyzer/src/dart/ast/ast.dart:17492:50)
NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13009:20)
BlockImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:2051:17)
RecursiveAstVisitor.visitBlock (package:analyzer/dart/ast/visitor.dart:883:10)
BlockImpl.accept (package:analyzer/src/dart/ast/ast.dart:2047:50)
IfStatementImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:9730:20)
RecursiveAstVisitor.visitIfStatement (package:analyzer/dart/ast/visitor.dart:1273:10)
IfStatementImpl.accept (package:analyzer/src/dart/ast/ast.dart:9724:50)
NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13009:20)
BlockImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:2051:17)
RecursiveAstVisitor.visitBlock (package:analyzer/dart/ast/visitor.dart:883:10)
BlockImpl.accept (package:analyzer/src/dart/ast/ast.dart:2047:50)
BlockFunctionBodyImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:2007:12)
RecursiveAstVisitor.visitBlockFunctionBody (package:analyzer/dart/ast/visitor.dart:889:10)
BlockFunctionBodyImpl.accept (package:analyzer/src/dart/ast/ast.dart:1999:50)
FunctionExpressionImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:8624:11)
RecursiveAstVisitor.visitFunctionExpression (package:analyzer/dart/ast/visitor.dart:1213:10)
FunctionExpressionImpl.accept (package:analyzer/src/dart/ast/ast.dart:8613:50)
NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13009:20)
ArgumentListImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:476:16)
RecursiveAstVisitor.visitArgumentList (package:analyzer/dart/ast/visitor.dart:823:10)
ArgumentListImpl.accept (package:analyzer/src/dart/ast/ast.dart:472:50)
MethodInvocationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:12258:19)
RecursiveAstVisitor.visitMethodInvocation (package:analyzer/dart/ast/visitor.dart:1411:10)
_ReferenceFinder.visitMethodInvocation (package:analysis_server/src/services/correction/dart/import_add_show.dart:96:11)
MethodInvocationImpl.accept (package:analyzer/src/dart/ast/ast.dart:12246:50)
ExpressionStatementImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:6366:17)
RecursiveAstVisitor.visitExpressionStatement (package:analyzer/dart/ast/visitor.dart:1099:10)
ExpressionStatementImpl.accept (package:analyzer/src/dart/ast/ast.dart:6362:50)
NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13009:20)
BlockImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:2051:17)
RecursiveAstVisitor.visitBlock (package:analyzer/dart/ast/visitor.dart:883:10)
BlockImpl.accept (package:analyzer/src/dart/ast/ast.dart:2047:50)
BlockFunctionBodyImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:2007:12)
RecursiveAstVisitor.visitBlockFunctionBody (package:analyzer/dart/ast/visitor.dart:889:10)
BlockFunctionBodyImpl.accept (package:analyzer/src/dart/ast/ast.dart:1999:50)
MethodDeclarationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:12069:10)
RecursiveAstVisitor.visitMethodDeclaration (package:analyzer/dart/ast/visitor.dart:1405:10)
MethodDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:12061:50)
NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13009:20)
ClassDeclarationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:2939:13)
RecursiveAstVisitor.visitClassDeclaration (package:analyzer/dart/ast/visitor.dart:937:10)
ClassDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:2929:50)
NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13009:20)
CompilationUnitImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:3621:21)
RecursiveAstVisitor.visitCompilationUnit (package:analyzer/dart/ast/visitor.dart:961:10)
CompilationUnitImpl.accept (package:analyzer/src/dart/ast/ast.dart:3614:50)
ImportAddShow.compute (package:analysis_server/src/services/correction/dart/import_add_show.dart:48:10)
AssistProcessor._addFromProducers.compute (package:analysis_server/src/services/correction/assist_internal.dart:207:24)
AssistProcessor._addFromProducers (package:analysis_server/src/services/correction/assist_internal.dart:228:15)
AssistProcessor.compute (package:analysis_server/src/services/correction/assist_internal.dart:181:5)
EditGetAssistsHandler._computeServerAssists (package:analysis_server/src/handler/legacy/edit_get_assists.dart:105:23)
OperationPerformanceImpl.runAsync (package:analyzer/src/util/performance/operation_performance.dart:174:14)
EditGetAssistsHandler.handle (package:analysis_server/src/handler/legacy/edit_get_assists.dart:57:19)
LegacyAnalysisServer.handleRequest.. (package:analysis_server/src/legacy_analysis_server.dart:569:11)
OperationPerformanceImpl.runAsync (package:analyzer/src/util/performance/operation_performance.dart:174:14)
LegacyAnalysisServer.handleRequest. (package:analysis_server/src/legacy_analysis_server.dart:550:7)

#0      EditGetAssistsHandler._computeServerAssists (package:analysis_server/src/handler/legacy/edit_get_assists.dart:117:9)
<asynchronous suspension>
#1      OperationPerformanceImpl.runAsync (package:analyzer/src/util/performance/operation_performance.dart:174:14)
<asynchronous suspension>
#2      EditGetAssistsHandler.handle (package:analysis_server/src/handler/legacy/edit_get_assists.dart:57:19)
<asynchronous suspension>
#3      LegacyAnalysisServer.handleRequest.<anonymous closure>.<anonymous closure> (package:analysis_server/src/legacy_analysis_server.dart:569:11)
<asynchronous suspension>
#4      OperationPerformanceImpl.runAsync (package:analyzer/src/util/performance/operation_performance.dart:174:14)
<asynchronous suspension>
#5      LegacyAnalysisServer.handleRequest.<anonymous closure> (package:analysis_server/src/legacy_analysis_server.dart:550:7)
<asynchronous suspension>

Debug log

1746598954615 <= {"id":"2958"}
1746598954615 <= {"event":"server.status","params":{"analysis":{"isAnalyzing":true}}}
1746598954634 <= {"event":"analysis.errors","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","errors":[{"severity":"INFO","type":"HINT","location":{"file":"file://...
1746598954636 <= {"event":"analysis.highlights","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","regions":[{"type":"DIRECTIVE","offset":0,"length":20},{"type":"BU...
1746598954642 <= {"event":"analysis.navigation","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","regions":[{"offset":7,"length":12,"targets":[0]},{"offset":28,"le...
1746598954642 <= {"event":"analysis.closingLabels","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","labels":[{"offset":3614,"length":445,"label":"Container"},{"of...
1746598954644 <= {"event":"analysis.outline","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","kind":"LIBRARY","outline":{"element":{"kind":"COMPILATION_UNIT","nam...
1746598954644 <= {"event":"analysis.overrides","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","overrides":[{"offset":3573,"length":5,"superclassMember":{"element...
1746598954648 <= {"event":"flutter.outline","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","outline":{"kind":"DART_ELEMENT","offset":0,"length":19778,"codeOffset...
1746598954649 <= {"event":"server.status","params":{"analysis":{"isAnalyzing":false}}}
1746598954649 <= {"event":"analysis.implemented","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","classes":[],"members":[]}}
1746598954994 => {"id":"2959","method":"edit.getAssists","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/shader_app.dart","offset":18610,"length":0},"clientRequestTime":1746598954...
1746598954999 <= {"id":"2959","result":{"assists":[]}}
1746598956116 => {"id":"2960","method":"analysis.setPriorityFiles","params":{"files":["file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart"]},"clientRequestTime":174...
1746598956116 => {"id":"2961","method":"analysis.setSubscriptions","params":{"subscriptions":{"CLOSING_LABELS":["file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart"...
1746598956120 <= {"id":"2960"}
1746598956120 <= {"id":"2961"}
1746598956120 <= {"event":"server.status","params":{"analysis":{"isAnalyzing":true}}}
1746598956126 <= {"event":"analysis.errors","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","errors":[{"severity":"WARNING","type":"STATIC_WAR...
1746598956126 <= {"event":"analysis.highlights","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","regions":[{"type":"DIRECTIVE","offset":0,"len...
1746598956128 <= {"event":"analysis.navigation","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","regions":[{"offset":7,"length":31,"targets":[...
1746598956128 <= {"event":"analysis.closingLabels","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","labels":[{"offset":2691,"length":422,"labe...
1746598956128 <= {"event":"analysis.outline","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","kind":"LIBRARY","outline":{"element":{"kind":"CO...
1746598956128 <= {"event":"analysis.overrides","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","overrides":[{"offset":3141,"length":5,"supercl...
1746598956129 <= {"event":"flutter.outline","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","outline":{"kind":"DART_ELEMENT","offset":0,"lengt...
1746598956130 <= {"event":"server.status","params":{"analysis":{"isAnalyzing":false}}}
1746598956130 <= {"event":"analysis.implemented","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","classes":[],"members":[]}}
1746598956448 => {"id":"2962","method":"edit.getAssists","params":{"file":"file:///Users/sakari/dvl/omg/shader_playground/lib/ui_elements/shader_param_panel.dart","offset":0,"length":0},"clientRequest...
1746598956452 <= {"event":"server.error","params":{"isFatal":false,"message":"Internal error: UnimplementedError\n#0      ElementImpl2.enclosingElement2 (package:analyzer/src/dart/element/element.dart...
1746598956453 <= {"id":"2962","error":{"code":"SERVER_ERROR","message":"UnimplementedError\n#0      ElementImpl2.enclosingElement2 (package:analyzer/src/dart/element/element.dart:3106:38)\n#1      _Re...

`

This happens every time I switch a tab in my Android Studio.
I don't know when this started happening, but earlier this used not to happen.

I am stuck to Flutter 3.27.3 though (due to 3.29 disabling Skia backend on iOS), so I am guessing might this be the reason ?

This is my Flutter Doctor output:

`❯ flutter doctor -v
[✓] Flutter (Channel stable, 3.27.3, on macOS 14.6.1 23G93 darwin-arm64, locale en-FI)
• Flutter version 3.27.3 on channel stable at /Users/sakari/dvl/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision c519ee916e (4 months ago), 2025-01-21 10:32:23 -0800
• Engine revision e672b006cb
• Dart version 3.6.1
• DevTools version 2.40.2

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
• Android SDK at /Users/sakari/Library/Android/sdk
• Platform android-35, build-tools 35.0.0
• ANDROID_HOME = /Users/sakari/Library/Android/sdk
• Java binary at: /Users/sakari/dvl/jdk/jdk-17.0.13+11/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment Temurin-17.0.13+11 (build 17.0.13+11)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16C5032a
• CocoaPods version 1.16.2

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.3)
• Android Studio at /Users/sakari/Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 21.0.6+-13368085-b895.109)

[✓] VS Code (version 1.93.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension can be installed from:
🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (3 available)
• macOS (desktop) • macos • darwin-arm64 • macOS 14.6.1 23G93 darwin-arm64
• Mac Designed for iPad (desktop) • mac-designed-for-ipad • darwin • macOS 14.6.1 23G93 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 136.0.7103.93
! Error: Browsing on the local area network for Moonstone. Ensure the device is unlocked and attached with a cable or associated with
the same local area network as this Mac.
The device must be opted into Developer Mode to connect wirelessly. (code -27)
! Error: Browsing on the local area network for SpacePad. Ensure the device is unlocked and attached with a cable or associated with the
same local area network as this Mac.
The device must be opted into Developer Mode to connect wirelessly. (code -27)

[✓] Network resources
• All expected network resources are available.

• No issues found!`

I am running Android Studio Meerkat Feature Drop | 2024.3.2

Any idea why this is happening ? How might I fix this ?

The text was updated successfully, but these errors were encountered:

FMorschel · 2025-05-07T13:59:02Z

CC @scheglov @bwilkerson

bwilkerson · 2025-05-07T14:55:00Z

I am stuck to Flutter 3.27.3 though (due to 3.29 disabling Skia backend on iOS), so I am guessing might this be the reason ?

The issue has nothing to do with the changes to Skia, it's a result of an incomplete implementation in the analyzer.

@johnniwinther @scheglov

This needs to be implemented on the analyzer side. Unfortunately, the exception message doesn't indicate what class of element doesn't have the required implementation of enclosingElement2.

We should fix this before the 3.9 / 3.33 release. And probably before publishing another version of the analyzer package.

Also, on the server side, we should guard the execution of CorrectionProducers such that any exception thrown causes the correction to not be produced but doesn't prevent other correction producers from running and results from being returned. I'm surprised that this isn't already being done.

scheglov · 2025-05-07T16:07:06Z

It looks that in analyzer 7.4.4 the only subclass does not override and implement enclosingElement2 is GenericFunctionTypeElementImpl2.

bwilkerson · 2025-05-07T16:09:50Z

Should we remove the throw and make the method (in ElementImpl2) be abstract?

scheglov · 2025-05-07T16:12:04Z

It is still the same in 8.0.0-dev, only GenericFunctionTypeElementImpl2.
Not sure what to return, probably null.
The whole GenericFunctionTypeElementImpl2 is weird, exists only to host type parameters and formal parameters.
It cannot be referenced.

Yes, making ElementImpl2 .enclosingElement2 abstract instead of throwing sounds right to me.

bwilkerson · 2025-05-07T16:16:55Z

It cannot be referenced.

I'm not sure what that means.

The getter is being invoked here (https://github.com/dart-lang/sdk/blob/main/pkg/analysis_server/lib/src/services/correction/dart/import_add_show.dart#L71) as a result of asking an AssignmentExpression for its writeElement2.

Maybe the bug is that we're associating the wrong write element with the node?

scheglov · 2025-05-07T16:23:10Z

I don't mean that the API is not used, only that the fact that we give GenericFunctionType node a fragment and element is strange. The node itself cannot be referenced, in contrast to a class declaration for example. The same way as you cannot reference int in void foo(int a) {}, it is a property of another element.

Anyway, we will not do any significant change right now.

scheglov · 2025-05-07T16:26:26Z

https://dart-review.googlesource.com/c/sdk/+/427300

…ement2, when GenericFunctionTypeElementImpl2. Bug: #60683 Change-Id: I122eed163c8f713ca1dd416c194eb432f23802de Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/427300 Reviewed-by: Brian Wilkerson <[email protected]> Commit-Queue: Konstantin Shcheglov <[email protected]>

scheglov · 2025-05-07T19:29:34Z

CL for back-porting as analyzer 7.4.5: https://dart-review.googlesource.com/c/sdk/+/427322

FMorschel · 2025-05-08T12:20:34Z

Also, on the server side, we should guard the execution of CorrectionProducers such that any exception thrown causes the correction to not be produced but doesn't prevent other correction producers from running and results from being returned. I'm surprised that this isn't already being done.

Just to be sure this wasn't forgotten. Has this been done too @bwilkerson?

bwilkerson · 2025-05-08T16:17:48Z

Not that I'm aware of, no.

Sakari369 added the area-devexp For issues related to the analysis server, IDE support, linter, `dart fix`, and diagnostic messages. label May 7, 2025

scheglov self-assigned this May 7, 2025

scheglov added the P2 A bug or feature request we're likely to work on label May 7, 2025

scheglov closed this as completed May 7, 2025

FMorschel mentioned this issue May 8, 2025

CorrectionProducers computing should handle errors differently #60694

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Dart analysis issue with Android Studio (Flutter 3.27.3, Dart 3.6.1) #60683

Dart analysis issue with Android Studio (Flutter 3.27.3, Dart 3.6.1) #60683

Sakari369 commented May 7, 2025

FMorschel commented May 7, 2025 •

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FMorschel commented May 8, 2025

bwilkerson commented May 8, 2025

Dart analysis issue with Android Studio (Flutter 3.27.3, Dart 3.6.1) #60683

Dart analysis issue with Android Studio (Flutter 3.27.3, Dart 3.6.1) #60683

Comments

Sakari369 commented May 7, 2025

Dart analysis issue

Version information

Details

Debug log

FMorschel commented May 7, 2025 • edited Loading

bwilkerson commented May 7, 2025

scheglov commented May 7, 2025

bwilkerson commented May 7, 2025

scheglov commented May 7, 2025

bwilkerson commented May 7, 2025

scheglov commented May 7, 2025

scheglov commented May 7, 2025

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bwilkerson commented May 8, 2025

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scheglov commented May 7, 2025 •

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