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tests: add a test showing traceback on `hg stack` in case of split stable
Mon, 11 Dec 2017 23:33:50 +0530, by Pulkit Goyal
branching: merge stable into default
Mon, 11 Dec 2017 15:49:22 +0100, by Pierre-Yves David
test-compat: merge mercurial-4.2 into mercurial-4.1 mercurial-4.1
Mon, 11 Dec 2017 09:33:32 +0100, by Pierre-Yves David

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