Flagged by flake8 v3.6.0, as W605, plus a few others identified
incidentally, e.g. 59ffecf66cf4d08c4b431e457b083878d66a3fd6.
Note that r"\n" matches to "\n" under re.match/search.
The specific length of the uacomment is one shorter on `0.16.0` than on
`0.15.99` causing the (stupid) test to fail.
Just match the latter part of the message only.