VS Code debug <optimized out> with Flutter 3.10 / Dart 3.0

Question

After latest "flutter upgrade" I'm having problems viewing some variables during debug in VS Code.

How can I view the contents of variables when hovering instead of getting this

Screenshot of hovering variable:

This only happens to some variables, others I can view the contents of as normal.

Flutter doctor output:

[✓] Flutter (Channel stable, 3.10.0, on macOS 13.2.1 22D68 darwin-arm64, locale
    en-SE)
    • Flutter version 3.10.0 on channel stable at
      /opt/homebrew/Caskroom/flutter/2.10.0/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 84a1e904f4 (5 days ago), 2023-05-09 07:41:44 -0700
    • Engine revision d44b5a94c9
    • Dart version 3.0.0
    • DevTools version 2.23.1

[✓] Android toolchain - develop for Android devices (Android SDK version
    34.0.0-rc2)
    • Android SDK at /Users/niklaselelid/Library/Android/sdk
    • Platform android-33, build-tools 34.0.0-rc2
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 14E222b
    • CocoaPods version 1.11.3

[✓] Android Studio (version 2020.3)
    • Android Studio at /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 11.0.10+0-b96-7281165)

[✓] VS Code (version 1.78.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.64.0

[✓] Connected device (2 available)
    • iPhone 14 Pro Max (mobile) •
    • ios
    • com.apple.CoreSimulator.SimRuntime.iOS-16-4 (simulator)
    • macOS (desktop)            • macos                                •
      darwin-arm64 • macOS 13.2.1 22D68 darwin-arm64

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

I have looked for possible settings to configure the behavior. Without luck.

Answer 1

Nothing wrong with your code. There's an issue with Dart SDK, which is not resolved yet. Please upvote it to get more attention from the Dart team.