facebook/arcanist — pull request #126 by joshuaspence (2013-12-10 21:40:51+00:00)
Title: Create arc config directory if it does not exist

It seems that `ArcanistWorkingCopyIdentity::writeLocalArcConfig` fails if the `.git/arc` (for example) directory does not exist. It seems logical to me that this directory should be created if it does not yet exist.