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.