Wed, 10 Jan 2018 10:44:21 -0800 phase: use context managers for lock and transaction
Martin von Zweigbergk <martinvonz@google.com> [Wed, 10 Jan 2018 10:44:21 -0800] rev 35575
phase: use context managers for lock and transaction Differential Revision: https://phab.mercurial-scm.org/D1838
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