Hello,

I tried to run the app (flutter run) and a got a error message which i does not understand,

[youssef@ksjdqfhklsjh menu_flutter]$ flutter run
Using hardware rendering with device Android SDK built for x86 64. If you get graphics artifacts, consider enabling software rendering with "--enable-software-rendering".
Launching lib/main.dart on Android SDK built for x86 64 in debug mode...
Initializing gradle...                                       0.6s
Resolving dependencies...                                    0.9s
Running 'gradlew assembleDebug'...                               
compiler message: lib/screens/pager.dart:91:30: Error: The keyword 'const' or 'new' is required here. Due to an implementation limit, the compiler isn't able to infer 'const' or 'new' here.
compiler message:                       child: Icon(
compiler message:                              ^
compiler message: Unhandled exception:
Crash when compiling file:///home/youssef/Applications/flutter-examples/menu_flutter/lib/screens/pager.dart,
at character offset 1497:
lib/screens/pager.dart: Internal problem: Unhandled this in defaultTreeNode.
#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.visitThisExpression (package:kernel/visitor.dart:171)
#5      ThisExpression.accept (package:kernel/ast.dart:3341)
#6      ConstnessEvaluator.visitPropertyGet (package:front_end/src/fasta/kernel/constness_evaluator.dart:287)
#7      PropertyGet.accept (package:kernel/ast.dart:2242)
#8      ConstnessEvaluator.visitConstructorInvocation (package:front_end/src/fasta/kernel/constness_evaluator.dart:175)
#9      ConstructorInvocation.accept (package:kernel/ast.dart:2983)
#10     ConstnessEvaluator.evaluate (package:front_end/src/fasta/kernel/constness_evaluator.dart:99)
#11     evaluateConstness (package:front_end/src/fasta/kernel/constness_evaluator.dart:466)
#12     BodyBuilder.inferConstness (package:front_end/src/fasta/kernel/body_builder.dart:710)
#13     BodyBuilder.finishFunction (package:front_end/src/fasta/kernel/body_builder.dart:697)
#14     DietListener.listenerFinishFunction (package:front_end/src/fasta/source/diet_listener.dart:684)
#15     DietListener.parseFunctionBody (package:front_end/src/fasta/source/diet_listener.dart:718)
#16     DietListener.buildFunctionBody (package:front_end/src/fasta/source/diet_listener.dart:565)
#17     DietListener.endMethod (package:front_end/src/fasta/source/diet_listener.dart:530)
#18     Parser.parseMethod (package:front_end/src/fasta/parser/parser.dart:3796)
#19     Parser.parseClassMemberImpl (package:front_end/src/fasta/parser/parser.dart:3670)
#20     Parser.parseClassBody (package:front_end/src/fasta/parser/parser.dart:3467)
#21     Parser.parseClass (package:front_end/src/fasta/parser/parser.dart:1699)
#22     Parser.parseClassOrNamedMixinApplication (package:front_end/src/fasta/parser/parser.dart:1659)
#23     Parser.parseTopLevelKeywordDeclaration (package:front_end/src/fasta/parser/parser.dart:535)
#24     Parser.parseTopLevelDeclarationImpl (package:front_end/src/fasta/parser/parser.dart:451)
#25     Parser.parseUnit (package:front_end/src/fasta/parser/parser.dart:335)
#26     SourceLoader.buildBody (package:front_end/src/fasta/source/source_loader.dart:198)
<asynchronous suspension>
#27     Loader.buildBodies (package:front_end/src/fasta/loader.dart:157)
<asynchronous suspension>
#28     KernelTarget.buildComponent (package:front_end/src/fasta/kernel/kernel_target.dart:292)
<asynchronous suspension>
#29     IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:140)
<asynchronous suspension>
#30     CompilerContext.runInContext.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:105)
#31     _rootRun (dart:async/zone.dart:1126)
#32     _CustomZone.run (dart:async/zone.dart:1023)
#33     runZoned (dart:async/zone.dart:1501)
#34     CompilerContext.runInContext (package:front_end/src/fasta/compiler_context.dart:105)
#35     IncrementalCompiler.computeDelta (package:front_end/src/fasta/incremental_compiler.dart:61)
<asynchronous suspension>
#36     IncrementalCompiler.compile (package:vm/incremental_compiler.dart:33)
<asynchronous suspension>
#37     FrontendCompiler.compile.<anonymous closure> (package:vm/frontend_server.dart:254)
#38     new Future.<anonymous closure> (dart:async/future.dart:174)
#39     _rootRun (dart:async/zone.dart:1122)
#40     _CustomZone.run (dart:async/zone.dart:1023)
#41     _CustomZone.runGuarded (dart:async/zone.dart:925)
#42     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965)
#43     _rootRun (dart:async/zone.dart:1126)
#44     _CustomZone.run (dart:async/zone.dart:1023)
#45     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:949)
#46     Timer._createTimer.<anonymous closure> (dart:async-patch/dart:async/timer_patch.dart:21)
#47     _Timer._runTimers (dart:isolate-patch/dart:isolate/timer_impl.dart:382)
#48     _Timer._handleMessage (dart:isolate-patch/dart:isolate/timer_impl.dart:416)
#49     _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.visitThisExpression (package:kernel/visitor.dart:171)
#5      ThisExpression.accept (package:kernel/ast.dart:3341)
#6      ConstnessEvaluator.visitPropertyGet (package:front_end/src/fasta/kernel/constness_evaluator.dart:287)
#7      PropertyGet.accept (package:kernel/ast.dart:2242)
#8      ConstnessEvaluator.visitConstructorInvocation (package:front_end/src/fasta/kernel/constness_evaluator.dart:175)
#9      ConstructorInvocation.accept (package:kernel/ast.dart:2983)
#10     ConstnessEvaluator.evaluate (package:front_end/src/fasta/kernel/constness_evaluator.dart:99)
#11     evaluateConstness (package:front_end/src/fasta/kernel/constness_evaluator.dart:466)
#12     BodyBuilder.inferConstness (package:front_end/src/fasta/kernel/body_builder.dart:710)
#13     BodyBuilder.finishFunction (package:front_end/src/fasta/kernel/body_builder.dart:697)
#14     DietListener.listenerFinishFunction (package:front_end/src/fasta/source/diet_listener.dart:684)
#15     DietListener.parseFunctionBody (package:front_end/src/fasta/source/diet_listener.dart:718)
#16     DietListener.buildFunctionBody (package:front_end/src/fasta/source/diet_listener.dart:565)
#17     DietListener.endMethod (package:front_end/src/fasta/source/diet_listener.dart:530)
#18     Parser.parseMethod (package:front_end/src/fasta/parser/parser.dart:3796)
#19     Parser.parseClassMemberImpl (package:front_end/src/fasta/parser/parser.dart:3670)
#20     Parser.parseClassBody (package:front_end/src/fasta/parser/parser.dart:3467)
#21     Parser.parseClass (package:front_end/src/fasta/parser/parser.dart:1699)
#22     Parser.parseClassOrNamedMixinApplication (package:front_end/src/fasta/parser/parser.dart:1659)
#23     Parser.parseTopLevelKeywordDeclaration (package:front_end/src/fasta/parser/parser.dart:535)
#24     Parser.parseTopLevelDeclarationImpl (package:front_end/src/fasta/parser/parser.dart:451)
#25     Parser.parseUnit (package:front_end/src/fasta/parser/parser.dart:335)
#26     SourceLoader.buildBody (package:front_end/src/fasta/source/source_loader.dart:198)
<asynchronous suspension>
#27     Loader.buildBodies (package:front_end/src/fasta/loader.dart:157)
<asynchronous suspension>
#28     KernelTarget.buildComponent (package:front_end/src/fasta/kernel/kernel_target.dart:292)
<asynchronous suspension>
#29     IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:140)
<asynchronous suspension>
#30     CompilerContext.runInContext.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:105)
#31     _rootRun (dart:async/zone.dart:1126)
#32     _CustomZone.run (dart:async/zone.dart:1023)
#33     runZoned (dart:async/zone.dart:1501)
#34     CompilerContext.runInContext (package:front_end/src/fasta/compiler_context.dart:105)
#35     IncrementalCompiler.computeDelta (package:front_end/src/fasta/incremental_compiler.dart:61)
<asynchronous suspension>
#36     IncrementalCompiler.compile (package:vm/incremental_compiler.dart:33)
<asynchronous suspension>
#37     FrontendCompiler.compile.<anonymous closure> (package:vm/frontend_server.dart:254)
#38     new Future.<anonymous closure> (dart:async/future.dart:174)
#39     _rootRun (dart:async/zone.dart:1122)
#40     _CustomZone.run (dart:async/zone.dart:1023)
#41     _CustomZone.runGuarded (dart:async/zone.dart:925)
#42     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965)
#43     _rootRun (dart:async/zone.dart:1126)
#44     _CustomZone.run (dart:async/zone.dart:1023)
#45     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:949)
#46     Timer._createTimer.<anonymous closure> (dart:async-patch/dart:async/timer_patch.dart:21)
#47     _Timer._runTimers (dart:isolate-patch/dart:isolate/timer_impl.dart:382)
#48     _Timer._handleMessage (dart:isolate-patch/dart:isolate/timer_impl.dart:416)
#49     _RawReceivePortImpl._handleMessage (dart:isolate-patch/dart:isolate/isolate_patch.dart:165)

Compiler terminated unexpectedly on /home/youssef/Applications/flutter-examples/menu_flutter/lib/main.dart

FAILURE: Build failed with an exception.

* Where:
Script '/home/youssef/Applications/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 441

* What went wrong:
Execution failed for task ':app:flutterDependenciesDebug'.
> Process 'command '/home/youssef/Applications/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.
Gradle build failed: 1

Do you have any idea on what am i doing wrong ? thank you.

Ps : Let me tell you that your app looks wonderfull, you made a really great job on the design !

Braulio, I've tweaked the names of some of the menu items here along with fixing a few other minor nits. Note that I've switched to the new syntax for optional const, so this code requires --preview-dart-2 if you're running from the beta channel.

Make cards on the side smaller than the one in the middle and a slide transition when the're changed. Maybe turn it in to a lib who knows someone else will find it useful

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