Using position-only parameter syntax in __init__ prevents docstrings for attributes from being parsed

[bryanforbes]

Describe the bug

I'm currently using position-only parameters in most of my functions, including __init__, however this prevents inline, before, and after doc strings from being parsed.

How to Reproduce

$ git clone https://github.com/bryanforbes/sphinx-positional-only-issue
$ cd sphinx-positional-only-issue
$ pip install -r requirements.txt
$ cd docs
$ make html
$ open _build/html/index.html

Once index.html is open, you will see that only test.WithoutPositional has the a property documented.

Expected behavior

Both classes should have the a property documented

Your project

https://github.com/bryanforbes/sphinx-positional-only-issue

Screenshots

OS

macOS 11.6.1

Python version

3.10

Sphinx version

4.3.1

Sphinx extensions

sphinx.ext.autodoc, sphinx.ext.napoleon

Extra tools

No response

Additional context

No response

[tk0miya]

Thank you for reporting. The posonlyargs confuses our parser. Will be fixed via #9987.