[BUG] C domain does not work

[ISSOtm]

Describe the bug
AssertionError: Empty title when using the C domain

To Reproduce
Steps to reproduce the behavior:

1. Write .. c:function:: PyObject *PyType_GenericAlloc(PyTypeObject *type, Py_ssize_t nitems) (lifted from the official Sphinx documentation) in index.rst
2. sphinx-build -b markdown <source> <dest> trips the assertion
3. Disabling the assertion (python -O path/to/sphinx-build -b markdown <source> <dest>) instead yields an empty title on the function documentation

Expected behavior
A clear and concise description of what you expected to happen.

Environment:

• OS: Arch Linux
• Sphinx==8.2.1
• sphinx-markdown-builder==0.6.8

Additional context
I tried looking into this issue, but I'm failing to grasp what the data flow is. Sorry, I don't have any more details than this.

[ISSOtm]

Ah, I figured it out: it seems like adding the following to translator.py fixes the issue although I don't know if it's a proper fix 😅

    def visit_desc_signature_line(self, node):
    	pass

Please let me know if you'd like this PR'd?

[liran-funaro]

Thanks. I'll look into it.

[liran-funaro]

Thanks for taking the time to report this.
I added fix and test per your suggestion. It seems to work for me.
Please let me know if it solves the issue for your use case.

You can install the latest commit and see if it solves this issue for you.
If it solves it, I'll upload a new version soon.

pip uninstall sphinx-markdown-builder
pip install git+https://github.com/liran-funaro/sphinx-markdown-builder.git@main