Got bitten by this when converting some big git repo.
1 patch for repository http://darcs.net:
patch 3c05421314192dd46e87c273b4e972750f7c55e9
Author: Guillaume Hoffmann <guillaumh@gmail.com>
Date: Mon Jan 25 10:36:39 ART 2016
* avoid irrefutable pattern when importing unnamed commit
original patch by Owen Stephens