When commit url ends with a dot (e.g. http://bugs.python.org/msg152756), Roundup thinks the dot is part of the url, so it's often like a broken link:

good: http://hg.python.org/cpython/file/567767a6df02/Lib/packaging/tests/test_version.py#l68
bad: http://hg.python.org/cpython/file/567767a6df02/Lib/packaging/tests/test_version.py#l68.

This should be fixed already (unless I'm missing something), but for some reason it doesn't seem to work.  I'll check again and see if there is indeed a bug with the code or is there another reason for this.

I was pretty sure I fixed this already, but I tried on a local instance on my laptop and it's not working, so I'm probably just confusing this problem with <http://issues.roundup-tracker.org/issue2550657>.  The fact that I can't find any tests for it around seems to confirm this (or maybe I have local changes on my home pc since iirc it's working there).
Once I get home I'll double check this and then fix it.

Eventually I got home and checked, and it's failing here too.
The attached patch fixes the issue, ignoring a single trailing dot, comma, colon, semicolon, or exclamation mark.  Maybe the question mark could be added too; closing parentheses are already ignored.
I tested the patch locally and it seems to work fine, however this should be reported and fixed upstream.  I'll create a new issue upstream once I prepare a proper patch with tests.

The upstream issue (http://issues.roundup-tracker.org/issue2550759) has been fixed and I updated our tracker instance to include the fix.