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test-compat: merge mercurial-5.2 into mercurial-5.1 mercurial-5.1
Fri, 28 Feb 2020 23:10:48 +0700, by Anton Shestakov
test-compat: back out changeset 2371d40f0878 mercurial-5.2
Fri, 28 Feb 2020 22:48:46 +0700, by Anton Shestakov

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