From IRC:
[05:46am] marlin_: epriestley: hi mate! while i realize i am using this command wrongly, i thought to let you know about the undefined index warning: [05:46am] marlin_: $ arc backout D119 [05:46am] marlin_: [2014-05-21 14:45:49] ERROR 8: Undefined index: callsign at [/Users/ml/dev/arcanist/arcanist/src/workflow/ArcanistBackoutWorkflow.php:128] [05:46am] marlin_: #0 ArcanistBackoutWorkflow::run() called at [/Users/ml/dev/arcanist/arcanist/scripts/arcanist.php:322] [05:46am] phabot: D119: Lint and unit star support. - https://secure.phabricator.com/D119 [05:46am] marlin_: Usage Exception: Backout currently only supports Git and Mercurial