Nitpick flags Literal annotation values as missing py:class (with type hints in description) #9775
Description
Describe the bug
This is basically the same issue as #9576, which was fixed in #9602. However, I still get this issue when using autodoc_typehints = 'description'.
How to Reproduce
$ unzip attachment.zip
$ python3.9 -m venv .venv
$ . .venv/bin/activate
$ pip install sphinx
$ sphinx-build -b html -n -W docs docs/_build
Running Sphinx v4.2.0
making output directory... done
[autosummary] generating autosummary for: index.rst, rst/api.rst
[autosummary] generating autosummary for: <snip>/docs/rst/generated/dummy.foo.bar.rst
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 2 source files that are out of date
updating environment: [new config] 3 added, 0 changed, 0 removed
reading sources... [100%] rst/generated/dummy.foo.bar
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] rst/generated/dummy.foo.bar
Warning, treated as error:
<snip>/src/dummy/foo.py:docstring of dummy.foo.bar::py:class reference target not found: ''
Comment out the line autodoc_typehints = 'description' in docs/conf.py and it is successful, as shown below (and removing the build artifacts to start fresh).
$ sphinx-build -b html -n -W docs docs/_build
Running Sphinx v4.2.0
making output directory... done
[autosummary] generating autosummary for: index.rst, rst/api.rst
[autosummary] generating autosummary for: <snip>/docs/rst/generated/dummy.foo.bar.rst
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 2 source files that are out of date
updating environment: [new config] 3 added, 0 changed, 0 removed
reading sources... [100%] rst/generated/dummy.foo.bar
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] rst/generated/dummy.foo.bar
generating indices... genindex py-modindex done
writing additional pages... search done
copying static files... done
copying extra files... done
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded.
The HTML pages are in docs/_build.
Expected behavior
No error, the build should succeed.
Your project
See attachment in "How to Reproduce" section
Screenshots
N/A - output is shown in "How to Reproduce" section
OS
Linux and Windows
Python version
3.9
Sphinx version
4.2.0
Sphinx extensions
sphinx.ext.autodoc, sphinx.ext.autosummary
Extra tools
N/A
Additional context
This re-produces for me on both Linux and Windows. I think the source of it issue is probably from this line in merge_typehints since this function would otherwise be skipped if the type hints are left in the signature. But I haven't yet been able to track it all the way down to the error.