`generate-manual` yields failedToRunSubprocess(error: Process returned non-zero exit code '5'.)

[pepicrft]

I'm trying to use the generate-manual plugin on this repository, but get an error failedToRunSubprocess(error: Process returned non-zero exit code '5'.). My hunch is that the plugin is trying to run a sub-process internally that's failing for some reason, and since the stderr of the process is not forwarded to the parent process, it's hard to tell what's causing the issue.

ArgumentParser version: 1.4.0
Swift version:

swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-macosx14.0

Checklist

• If possible, I've reproduced the issue using the main branch of this package
• I've searched for existing GitHub issues

Steps to Reproduce

Clone this repository and run swift package plugin generate-manual --configuration debug .

Expected behavior

I'd expect the command to succeed.

Actual behavior

Failing command:

Building package in debug mode...
warning: 'path': /Users/pepicrft/src/github.com/tuist/tuist/.build/repositories/Path-7a19ec15 is not valid git repository for 'https://github.com/tuist/Path.git', will fetch again.
Fetching https://github.com/tuist/Path.git from cache
Fetched https://github.com/tuist/Path.git from cache (0.06s)
Built package in debug mode
Generating manual for tuistfixturegenerator...
Generated manual in '/Users/pepicrft/src/github.com/tuist/tuist/.build/plugins/GenerateManual/outputs/tuistfixturegenerator'
Generating manual for tuist...
Error: failedToRunSubprocess(error: Process returned non-zero exit code '5'.)
error: 'generate-manual' invocation failed: ''generate-manual' invocation failed with a nonzero exit code: '1'.'

[rauhul]

I updated the error message locally and see this:

Error: Failed to run subprocess: Process returned non-zero exit code '5'. Standard error:
ArgumentParser/ParsableArguments.swift:283: Fatal error: Validation failed for `BenchmarkCommand`:

- Multiple (3) `Option` or `Flag` arguments are named "-f".