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Cannot inspect value of lists with null values in debugger #4790
Description
Describe the bug
When debugging, I get an error if I try to inspect the value of lists that contain a null value.
To Reproduce
Create main.dart with the following code:
void main() {
final List<String?> myList = [null];
print(myList.length);
}Set a breakpoint at the print statement and debug the code.
Hover over myList either in the code pane or the debug sidebar.
VS Code displays an error: type 'Null' is not a subtype of type 'Response' in type cast
Expected behavior
You see the value of the list [null]
Screenshots
Please complete the following information:
Workspace Environment
Dart Code extension: 3.75.20231009
Flutter extension: 3.74.0 (not activated)
App: Visual Studio Code
App Host: desktop
Version: win 1.83.0
Workspace type: Unknown (Dart SDK) (LSP)
Dart (3.1.3): C:\tools\dart-sdk
Flutter (undefined): undefined (No device)
Output from 'dart info'
C:\tools\dart-sdk\bin\dart.exe info
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General info
- Dart 3.1.3 (stable) (Tue Sep 26 14:25:13 2023 +0000) on "windows_x64"
- on windows / "Windows 10 Home" 10.0 (Build 22621)
- locale is en-US
Process info
| Memory | CPU | Elapsed time | Command line |
|---|---|---|---|
| 361 MB | -- | dart.exe | |
| 103 MB | -- | dart.exe | |
| 386 MB | -- | dart.exe | |
| 47 MB | -- | dart.exe | |
| 293 MB | -- | dart.exe | |
| 378 MB | -- | dart.exe | |
| 148 MB | -- | dart.exe | |
| 85 MB | -- | dart.exe |
Activity
DanTup commentedon Oct 12, 2023
Thanks! Got a fix out at https://dart-review.googlesource.com/c/sdk/+/330280.
[dds/dap] Fix evaluation of lists containing nulls
DanTup commentedon Oct 12, 2023
Fixed by dart-lang/sdk@a949bbf. The fix is in the SDK debug adapter, so will show up in a future SDK release.
akshg05 commentedon Nov 23, 2023
Is the fix released and available? I still experience the same.
DanTup commentedon Nov 23, 2023
Unfortunately the fix was made after the branch for the last stable SDK releases. It will show up in the next stable SDK releases (it's probably already in the latest betas, but I'm not certain).
akshg05 commentedon Nov 23, 2023
Okay. Hope it comes in soon.
Thanks