Sphinx: Localize error is always hard

[buhtz]

This is an X-Post first asked on Sphinx Discussion forum.

I get errors like this:

reading sources... [100%] tools

/home/user/goodCloud/my.work/bit/backintime/common/snapshots.py:docstring of snapshots.Snapshots:4: WARNING: Inline literal start-string without end-string.
looking for now-outdated files... none found

But line 4 in that file is not the cause. I don't get it how Sphinx does the line numbering.
This is the original file: https://github.com/bit-team/backintime/b...apshots.py

Does anybody has an idea? I also would like to understand the Sphinx logic to prevent questions like this in the future and find the error line myself.