[[!comment format=mdwn
 username="joey"
 subject="""comment 4"""
 date="2018-03-14T20:17:31Z"
 content="""
tryLockExclusive is returning Nothing when this happens.

Which seems very similar to the problem fixed in
[[parallel_get_can_fail_some_downloads_and_require_re-getting_]].
Which really seemed to be fixed back then..
"""]]
