Closed
Description
Snippet from flutter doctor -v
[✓] Flutter (Channel master, v0.2.7-pre.5, on Mac OS X 10.13.3 17D102, locale en-US)
• Flutter version 0.2.7-pre.5 at /Users/mravn/github/flutter
• Framework revision 68db514ec0 (32 hours ago), 2018-03-30 19:48:51 -0700
• Engine revision c903c217a1
• Dart version 2.0.0-dev.43.0.flutter-52afcba357
Error (the Dart compiler is invoked by Gradle calling into Flutter tooling):
$ flutter run
Running "flutter packages get" in example... 1.1s
Launching lib/main.dart on Nexus 5X in debug mode...
Initializing gradle... 0.8s
Resolving dependencies... 0.9s
Running 'gradlew assembleDebug'...
compiler message: Unhandled exception:
Crash when compiling file:///Users/mravn/apps/music/example/lib/main.dart,
at character offset 764:
lib/main.dart:52:24: Internal problem: Unhandled () → void => #lib1::play(song, 1.0) in defaultTreeNode.
onTap: () => play(song, 1.0),
^
#0 internalProblem (package:front_end/src/fasta/problems.dart:30)
#1 unhandled (package:front_end/src/fasta/problems.dart:43)
#2 ConstnessEvaluator.defaultTreeNode (package:front_end/src/fasta/kernel/constness_evaluator.dart:112)
#3 TreeVisitor.defaultExpression (package:kernel/visitor.dart:140)
#4 TreeVisitor.visitFunctionExpression (package:kernel/visitor.dart:177)
#5 FunctionExpression.accept (package:kernel/ast.dart:3513)
#6 ConstnessEvaluator.visitConstructorInvocation (package:front_end/src/fasta/kernel/constness_evaluator.dart:175)
#7 ConstructorInvocation.accept (package:kernel/ast.dart:2983)
#8 ConstnessEvaluator.evaluate (package:front_end/src/fasta/kernel/constness_evaluator.dart:99)
#9 evaluateConstness (package:front_end/src/fasta/kernel/constness_evaluator.dart:466)
#10 BodyBuilder.inferConstness (package:front_end/src/fasta/kernel/body_builder.dart:710)
#11 BodyBuilder.finishFunction (package:front_end/src/fasta/kernel/body_builder.dart:697)
#12 DietListener.listenerFinishFunction (package:front_end/src/fasta/source/diet_listener.dart:684)
#13 DietListener.parseFunctionBody (package:front_end/src/fasta/source/diet_listener.dart:718)
#14 DietListener.buildFunctionBody (package:front_end/src/fasta/source/diet_listener.dart:565)
#15 DietListener.endMethod (package:front_end/src/fasta/source/diet_listener.dart:530)
#16 Parser.parseMethod (package:front_end/src/fasta/parser/parser.dart:3796)
#17 Parser.parseClassMemberImpl (package:front_end/src/fasta/parser/parser.dart:3670)
#18 Parser.parseClassBody (package:front_end/src/fasta/parser/parser.dart:3467)
#19 Parser.parseClass (package:front_end/src/fasta/parser/parser.dart:1699)
#20 Parser.parseClassOrNamedMixinApplication (package:front_end/src/fasta/parser/parser.dart:1659)
#21 Parser.parseTopLevelKeywordDeclaration (package:front_end/src/fasta/parser/parser.dart:535)
#22 Parser.parseTopLevelDeclarationImpl (package:front_end/src/fasta/parser/parser.dart:451)
#23 Parser.parseUnit (package:front_end/src/fasta/parser/parser.dart:335)
#24 SourceLoader.buildBody (package:front_end/src/fasta/source/source_loader.dart:198)
<asynchronous suspension>
#25 Loader.buildBodies (package:front_end/src/fasta/loader.dart:157)
<asynchronous suspension>
#26 KernelTarget.buildComponent (package:front_end/src/fasta/kernel/kernel_target.dart:292)
<asynchronous suspension>
#27 IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:140)
<asynchronous suspension>
#28 CompilerContext.runInContext.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:105)
#29 _rootRun (dart:async/zone.dart:1126)
#30 _CustomZone.run (dart:async/zone.dart:1023)
#31 runZoned (dart:async/zone.dart:1501)
#32 CompilerContext.runInContext (package:front_end/src/fasta/compiler_context.dart:105)
#33 IncrementalCompiler.computeDelta (package:front_end/src/fasta/incremental_compiler.dart:61)
<asynchronous suspension>
#34 IncrementalCompiler.compile (package:vm/incremental_compiler.dart:33)
<asynchronous suspension>
#35 FrontendCompiler.compile.<anonymous closure> (package:vm/frontend_server.dart:254)
#36 new Future.<anonymous closure> (dart:async/future.dart:174)
#37 _rootRun (dart:async/zone.dart:1122)
#38 _CustomZone.run (dart:async/zone.dart:1023)
#39 _CustomZone.runGuarded (dart:async/zone.dart:925)
#40 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965)
#41 _rootRun (dart:async/zone.dart:1126)
#42 _CustomZone.run (dart:async/zone.dart:1023)
#43 _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:949)
#44 Timer._createTimer.<anonymous closure> (dart:async-patch/dart:async/timer_patch.dart:21)
#45 _Timer._runTimers (dart:isolate-patch/dart:isolate/timer_impl.dart:382)
#46 _Timer._handleMessage (dart:isolate-patch/dart:isolate/timer_impl.dart:416)
#47 _RawReceivePortImpl._handleMessage (dart:isolate-patch/dart:isolate/isolate_patch.dart:165)
#0 internalProblem (package:front_end/src/fasta/problems.dart:30)
#1 unhandled (package:front_end/src/fasta/problems.dart:43)
#2 ConstnessEvaluator.defaultTreeNode (package:front_end/src/fasta/kernel/constness_evaluator.dart:112)
#3 TreeVisitor.defaultExpression (package:kernel/visitor.dart:140)
#4 TreeVisitor.visitFunctionExpression (package:kernel/visitor.dart:177)
#5 FunctionExpression.accept (package:kernel/ast.dart:3513)
#6 ConstnessEvaluator.visitConstructorInvocation (package:front_end/src/fasta/kernel/constness_evaluator.dart:175)
#7 ConstructorInvocation.accept (package:kernel/ast.dart:2983)
#8 ConstnessEvaluator.evaluate (package:front_end/src/fasta/kernel/constness_evaluator.dart:99)
#9 evaluateConstness (package:front_end/src/fasta/kernel/constness_evaluator.dart:466)
#10 BodyBuilder.inferConstness (package:front_end/src/fasta/kernel/body_builder.dart:710)
#11 BodyBuilder.finishFunction (package:front_end/src/fasta/kernel/body_builder.dart:697)
#12 DietListener.listenerFinishFunction (package:front_end/src/fasta/source/diet_listener.dart:684)
#13 DietListener.parseFunctionBody (package:front_end/src/fasta/source/diet_listener.dart:718)
#14 DietListener.buildFunctionBody (package:front_end/src/fasta/source/diet_listener.dart:565)
#15 DietListener.endMethod (package:front_end/src/fasta/source/diet_listener.dart:530)
#16 Parser.parseMethod (package:front_end/src/fasta/parser/parser.dart:3796)
#17 Parser.parseClassMemberImpl (package:front_end/src/fasta/parser/parser.dart:3670)
#18 Parser.parseClassBody (package:front_end/src/fasta/parser/parser.dart:3467)
#19 Parser.parseClass (package:front_end/src/fasta/parser/parser.dart:1699)
#20 Parser.parseClassOrNamedMixinApplication (package:front_end/src/fasta/parser/parser.dart:1659)
#21 Parser.parseTopLevelKeywordDeclaration (package:front_end/src/fasta/parser/parser.dart:535)
#22 Parser.parseTopLevelDeclarationImpl (package:front_end/src/fasta/parser/parser.dart:451)
#23 Parser.parseUnit (package:front_end/src/fasta/parser/parser.dart:335)
#24 SourceLoader.buildBody (package:front_end/src/fasta/source/source_loader.dart:198)
<asynchronous suspension>
#25 Loader.buildBodies (package:front_end/src/fasta/loader.dart:157)
<asynchronous suspension>
#26 KernelTarget.buildComponent (package:front_end/src/fasta/kernel/kernel_target.dart:292)
<asynchronous suspension>
#27 IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:140)
<asynchronous suspension>
#28 CompilerContext.runInContext.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:105)
#29 _rootRun (dart:async/zone.dart:1126)
#30 _CustomZone.run (dart:async/zone.dart:1023)
#31 runZoned (dart:async/zone.dart:1501)
#32 CompilerContext.runInContext (package:front_end/src/fasta/compiler_context.dart:105)
#33 IncrementalCompiler.computeDelta (package:front_end/src/fasta/incremental_compiler.dart:61)
<asynchronous suspension>
#34 IncrementalCompiler.compile (package:vm/incremental_compiler.dart:33)
<asynchronous suspension>
#35 FrontendCompiler.compile.<anonymous closure> (package:vm/frontend_server.dart:254)
#36 new Future.<anonymous closure> (dart:async/future.dart:174)
#37 _rootRun (dart:async/zone.dart:1122)
#38 _CustomZone.run (dart:async/zone.dart:1023)
#39 _CustomZone.runGuarded (dart:async/zone.dart:925)
#40 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965)
#41 _rootRun (dart:async/zone.dart:1126)
#42 _CustomZone.run (dart:async/zone.dart:1023)
#43 _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:949)
#44 Timer._createTimer.<anonymous closure> (dart:async-patch/dart:async/timer_patch.dart:21)
#45 _Timer._runTimers (dart:isolate-patch/dart:isolate/timer_impl.dart:382)
#46 _Timer._handleMessage (dart:isolate-patch/dart:isolate/timer_impl.dart:416)
#47 _RawReceivePortImpl._handleMessage (dart:isolate-patch/dart:isolate/isolate_patch.dart:165)
Compiler terminated unexpectedly on /Users/mravn/apps/music/example/lib/main.dart
FAILURE: Build failed with an exception.
* Where:
Script '/Users/mravn/github/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 441
* What went wrong:
Execution failed for task ':app:flutterBuildDebug'.
> Process 'command '/Users/mravn/github/flutter/bin/flutter'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
* Get more help at https://help.gradle.org
BUILD FAILED in 5s
Gradle build failed: 1
$
main.dart:
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:music/music.dart';
void main() {
runApp(MaterialApp(
home: Scaffold(
appBar: AppBar(title: Text('Musical App')),
body: Center(child: MusicPlayer()),
),
));
}
class MusicPlayer extends StatefulWidget {
@override
_MusicPlayerState createState() => _MusicPlayerState();
}
class _MusicPlayerState extends State<MusicPlayer> {
Future<List<Song>> _songsFuture;
@override
void initState() {
super.initState();
_songsFuture = isLicensed().then<List<Song>>((bool isLicensed) {
if (isLicensed) {
return songs();
} else {
throw 'Game over\nInsert coins';
}
});
}
@override
Widget build(BuildContext context) {
return FutureBuilder<List<Song>>(
future: _songsFuture,
builder: (_, AsyncSnapshot<List<Song>> snapshot) {
if (snapshot.hasError) {
return Text(snapshot.error.toString());
} else if (snapshot.hasData) {
final List<Song> songs = snapshot.data;
return ListView.builder(
itemCount: songs.length,
itemBuilder: (_, int index) {
final Song song = songs[index];
return ListTile(
leading: CircleAvatar(child: Text('${index + 1}')),
title: new Text(song.title),
subtitle: new Text(song.artist),
onTap: () => play(song, 1.0),
);
},
);
} else {
return CircularProgressIndicator();
}
},
);
}
}music.dart
import 'dart:async';
import 'package:flutter/services.dart';
const MethodChannel _channel = const MethodChannel('music');
Future<bool> isLicensed() async {
final bool result = await _channel.invokeMethod('isLicensed');
return result;
}
Future<List<Song>> songs() async {
final List<dynamic> songs = await _channel.invokeMethod('getSongs');
return songs.map(Song.fromJson).toList();
}
Future<void> play(Song song, double volume) async {
try {
await _channel.invokeMethod('play', <String, dynamic>{
'song': song.id,
'volume': volume,
});
} on PlatformException catch (e) {
throw 'Unable to play ${song.title}: ${e.message}';
}
}
class Song {
Song(this.id, this.title, this.artist);
final String id;
final String title;
final String artist;
static Song fromJson(dynamic json) {
return new Song(json['id'], json['title'], json['artist']);
}
}The code compiles nicely with an earlier version (Flutter beta):
[✓] Flutter (Channel beta, v0.2.3, on Mac OS X 10.13.3 17D102, locale en-US)
• Flutter version 0.2.3 at /Users/mravn/github/flutter
• Framework revision 5a58b36e36 (3 weeks ago), 2018-03-13 13:20:13 -0700
• Engine revision e61bb9ac3a
• Dart version 2.0.0-dev.35.flutter-290c576264