.arcconfig

phases: make sure an exception should be set on error return

This should never happen, but the code looks wrong without PyErr_Set*() call.

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    "phabricator.uri": "https://phab.mercurial-scm.org/",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}