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Published
20 hours ago •
dart-lang
dart-lang
Exceptions in Console are broken
What happened?
When rendering error occurs, console doesn't show correct exception and stacktrace
Steps to reproduce problem
Paste this code to DartPad and run it. Note: the code causes exception, this is on purpose.
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyWidget(),
);
}
}
class MyWidget extends LeafRenderObjectWidget {
@override
RenderObject createRenderObject(BuildContext context) {
return RenderMyWidget();
}
}
class RenderMyWidget extends RenderBox {}
Expected results
An exception with stacktrace should be printed to DartPad Console, like
======== Exception caught by rendering library =====================================================
The following assertion was thrown during performLayout():
RenderMyWidget did not implement performLayout().
RenderBox subclasses need to either override performLayout() to set a size and lay out any children, or, set sizedByParent to true so that performResize() sizes the render object.
The relevant error-causing widget was: ...
When the exception was thrown, this was the stack: ...
Actual results
In Firefox, the following is printed to DartPad Console:
Error: Assertion failed: file:///Users/brettmorgan/Documents/GitHub/dart-services/flutter-sdk/packages/flutter/lib/src/foundation/stack_frame.dart:114:12
match != null
"Expected DartError@https://storage.googleapis.com/nnbd_artifacts/2.12.3/dart_sdk.js:6666:7 to match RegExp/^(.+) (\\d+):(\\d+)\\s+(.+)$/."Error: Error: Assertion failed: file:///Users/brettmorgan/Documents/GitHub/dart-services/flutter-sdk/packages/flutter/lib/src/foundation/stack_frame.dart:114:12
match != null
"Expected DartError@https://storage.googleapis.com/nnbd_artifacts/2.12.3/dart_sdk.js:6666:7 to match RegExp/^(.+) (\\d+):(\\d+)\\s+(.+)$/."
In Chrome, DartPad Console simply says Script error., and exception is shown in Chrome DevTools Console:
dart_sdk.js:6666 Uncaught Error: Assertion failed: file:///Users/brettmorgan/Documents/GitHub/dart-services/flutter-sdk/packages/flutter/lib/src/foundation/stack_frame.dart:114:12
match != null
"Expected Error: Assertion failed: file:///Users/brettmorgan/Documents/GitHub/dart-services/flutter-sdk/packages/flutter/lib/src/foundation/stack_frame.dart:114:12 to match RegExp/^(.+) (\\d+):(\\d+)\\s+(.+)$/."
at Object.throw_ [as throw] (dart_sdk.js:5031)
at Object.assertFailed (dart_sdk.js:4970)
at Function._parseWebDebugFrame (flutter_web.js:280054)
at Function._parseWebFrame (flutter_web.js:280045)
at MappedIterator.new.fromStackTraceLine (flutter_web.js:280086)
at MappedIterator.new.moveNext (dart_sdk.js:21784)
at WhereTypeIterator.new.moveNext (dart_sdk.js:22774)
at JsIterator.next (dart_sdk.js:6699)
at Function.of (dart_sdk.js:42950)
at WhereTypeIterable.new.toList (dart_sdk.js:19942)
at Function.fromStackString (flutter_web.js:280041)
at Function.fromStackTrace (flutter_web.js:280037)
at assertions.FlutterErrorDetails.new.debugFillProperties (flutter_web.js:276109)
at flutter_web.js:276490
at assertions._FlutterErrorDetailsNode.new.get builder (flutter_web.js:276493)
at assertions._FlutterErrorDetailsNode.new.get builder [as builder] (flutter_web.js:276556)
at assertions._FlutterErrorDetailsNode.new.getProperties (flutter_web.js:276505)
at diagnostics$.TextTreeRenderer.new.[_debugRender] (flutter_web.js:278234)
at diagnostics$.TextTreeRenderer.new.render (flutter_web.js:278148)
at Function.dumpErrorToConsole (flutter_web.js:276223)
at flutter_web.js:276356
at Function.reportError (flutter_web.js:276317)
at binding$.WidgetsFlutterBinding.new.[_invokeFrameCallback] (flutter_web.js:306739)
at binding$.WidgetsFlutterBinding.new.handleDrawFrame (flutter_web.js:306706)
at flutter_web.js:306620
at internalCallback (dart_sdk.js:24050)
Or just
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: ElevatedButton(
onPressed: () => throw Exception(),
child: const Text('Click'),
),
);
}
}
run, click
Firefox:
Error: Assertion failed: file:///Users/brettmorgan/Documents/GitHub/dart-services/flutter-sdk/packages/flutter/lib/src/foundation/stack_frame.dart:114:12
match != null
"Expected DartError@https://storage.googleapis.com/nnbd_artifacts/2.14.4/dart_sdk.js:6780:7 to match RegExp/^(.+) (\\d+):(\\d+)\\s+(.+)$/."Error: Error: Assertion failed: file:///Users/brettmorgan/Documents/GitHub/dart-services/flutter-sdk/packages/flutter/lib/src/foundation/stack_frame.dart:114:12
match != null
"Expected DartError@https://storage.googleapis.com/nnbd_artifacts/2.14.4/dart_sdk.js:6780:7 to match RegExp/^(.+) (\\d+):(\\d+)\\s+(.+)$/."
Chrome:
Script error.
The failures comes from the _parseWebDebugFrame method, which is trying to parse a stack frame containing the string DartError@[...], which it wasn't designed to expect.
The framework catches the exception and calls reportError, which calls dumpErrorToConsole, which calls debugPrintStack, which calls defaultStackFilter:
Log
Uncaught Error: Assertion failed: file:///Users/ryjohn/code/github/dart-lang/dart-services/flutter-sdks/stable/packages/flutter/lib/src/foundation/stack_frame.dart:114:12
match != null
"Expected Error: Assertion failed: file:///Users/ryjohn/code/github/dart-lang/dart-services/flutter-sdks/stable/packages/flutter/lib/src/foundation/stack_frame.dart:114:12 to match RegExp/^(.+) (\\d+):(\\d+)\\s+(.+)$/."
at Object.throw_ [as throw] (errors.dart:251)
at Object.assertFailed (errors.dart:29)
at Function._parseWebDebugFrame (stack_frame.dart:114)
at Function._parseWebFrame (stack_frame.dart:100)
at MappedIterator.new.fromStackTraceLine (stack_frame.dart:202)
at MappedIterator.new.moveNext (iterable.dart:391)
at WhereTypeIterator.new.moveNext (iterable.dart:869)
at JsIterator.next (operations.dart:748)
at Function.of (core_patch.dart:527)
at WhereTypeIterable.new.toList (iterable.dart:388)
at Function.fromStackString (stack_frame.dart:89)
at Function.fromStackTrace (stack_frame.dart:80)
at binding$0.FlutterErrorDetailsForPointerEventDispatcher.new.debugFillProperties (assertions.dart:669)
at diagnostics.dart:2950
at assertions._FlutterErrorDetailsNode.new.get builder (diagnostics.dart:2952)
at assertions._FlutterErrorDetailsNode.new.get builder [as builder] (assertions.dart:1245)
at assertions._FlutterErrorDetailsNode.new.getProperties (diagnostics.dart:2967)
at diagnostics$.TextTreeRenderer.new.[_debugRender] (diagnostics.dart:1244)
at diagnostics$.TextTreeRenderer.new.render (diagnostics.dart:1121)
at dumpErrorToConsole (assertions.dart:973)
at Function.reportError (assertions.dart:1137)
at binding$.WidgetsFlutterBinding.new.dispatchEvent (binding.dart:421)
at binding$.WidgetsFlutterBinding.new.dispatchEvent (binding.dart:322)
at binding$.WidgetsFlutterBinding.new.[_handlePointerEventImmediately] (binding.dart:374)
at binding$.WidgetsFlutterBinding.new.handlePointerEvent (binding.dart:338)
at binding$.WidgetsFlutterBinding.new.[_flushPointerEventQueue] (binding.dart:296)
at binding$.WidgetsFlutterBinding.new.[_handlePointerDataPacket] (binding.dart:279)
at Object.invoke1 (platform_dispatcher.dart:1020)
at _engine.EnginePlatformDispatcher.__.invokeOnPointerDataPacket (platform_dispatcher.dart:184)
at _engine.PointerBinding.__.[_onPointerData] (pointer_binding.dart:130)
at pointer_binding.dart:558
at pointer_binding.dart:511
at loggedHandler (pointer_binding.dart:217)
DartError @ errors.dart:202
throw_ @ errors.dart:251
assertFailed @ errors.dart:29
_parseWebDebugFrame @ stack_frame.dart:114
_parseWebFrame @ stack_frame.dart:100
fromStackTraceLine @ stack_frame.dart:202
moveNext @ iterable.dart:391
moveNext @ iterable.dart:869
next @ operations.dart:748
of @ core_patch.dart:527
toList @ iterable.dart:388
fromStackString @ stack_frame.dart:89
fromStackTrace @ stack_frame.dart:80
debugFillProperties @ assertions.dart:669
(anonymous) @ diagnostics.dart:2950
get builder @ diagnostics.dart:2952
get builder @ assertions.dart:1245
getProperties @ diagnostics.dart:2967
[_debugRender] @ diagnostics.dart:1244
render @ diagnostics.dart:1121
dumpErrorToConsole @ assertions.dart:973
reportError @ assertions.dart:1137
dispatchEvent @ binding.dart:421
dispatchEvent @ binding.dart:322
[_handlePointerEventImmediately] @ binding.dart:374
handlePointerEvent @ binding.dart:338
[_flushPointerEventQueue] @ binding.dart:296
[_handlePointerDataPacket] @ binding.dart:279
invoke1 @ platform_dispatcher.dart:1020
invokeOnPointerDataPacket @ platform_dispatcher.dart:184
[_onPointerData] @ pointer_binding.dart:130
(anonymous) @ pointer_binding.dart:558
(anonymous) @ pointer_binding.dart:511
loggedHandler @ pointer_binding.dart:217
Show 4 more frames
It looks like we may need to adjust the defaultStackFilter RegExp in the SDK unless there's a way to modify the stack frame first.
