SyntaxError in validate-modern.py due to unescaped newline in f-string

[jiaxing-liu]

Windows Version

Microsoft Windows [Versions 10.0.26100.4061]

WSL Version

2.4.13.0

Are you using WSL 1 or WSL 2?

• [x] WSL 2
• [ ] WSL 1

Kernel Version

5.15.167.4-1

Distro Version

Ubuntu 20.04

Other Software

No response

Repro Steps

Running distributions/validate-modern.py with Python 3.8+ raises a SyntaxError:

File "distributions/validate-modern.py", line 157
print(f'::error file={manifest},line={line}::Error: {format_list(text).replace('\n', '%0A')}')
^
SyntaxError: unexpected character after line continuation character

Expected Behavior

No error.

Actual Behavior

Error!

Diagnostic Logs

This is caused by an unescaped newline (\n) being used inside a nested f-string expression. Python's f-string parsing does not allow certain escape sequences inside {}.

[github-actions[bot]]

Logs are required for review from WSL team

If this a feature request, please reply with '/feature'. If this is a question, reply with '/question'. Otherwise please attach logs by following the instructions below, your issue will not be reviewed unless they are added. These logs will help us understand what is going on in your machine.

How to collect WSL logs

Download and execute collect-wsl-logs.ps1 in an administrative powershell prompt:

Invoke-WebRequest -UseBasicParsing "https://raw.githubusercontent.com/microsoft/WSL/master/diagnostics/collect-wsl-logs.ps1" -OutFile collect-wsl-logs.ps1
Set-ExecutionPolicy Bypass -Scope Process -Force
.\collect-wsl-logs.ps1

The script will output the path of the log file once done.

If this is a networking issue, please use collect-networking-logs.ps1, following the instructions here

Once completed please upload the output files to this Github issue.

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[jiaxing-liu]

WslLogs-2025-05-26_20-21-54.zip The WSL logs is attached.

[github-actions[bot]]

Diagnostic information

Detected appx version: 2.4.13.0

[benhillis]

Fixed by #12977