dmypy: fix test failure on py39 #8793
Merged
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There's a fun Python 3.9 only test case failure, where "Daemon started" is
output after the error message from parsing options. I ended up needing to
bisect to figure out why this consistently breaks on Python 3.9. The issue is
caused by python/cpython#17646 (which fixes a
surprisingly old BPO).