Might be related to issue175

This makes it a pain to get old versions of darcs repositories.

darcs get --to-match='hash
20030921115726-53a90-7d65b741dd9d81ff290ee5423046dd53f783a180' ~/darcsImpl/stable 
Copying patch 3845 of 3845... done!
darcs: failed to read patch in get_extra:
Tue Jun 21 17:46:21 GMT 2005  Ian Lynagh <igloo@earth.li>
  * Fix types of curses functions
Perhaps this is a 'partial' repository?

% darcs --exact-version                          68darcs compiled on Jul  6
2006, at 23:57:41
# configured Thu Jul  6 22:49:50 CEST 2006
./configure --no-create --no-recursion

Context:

[TAG 1.0.8
Tommy Pettersson <ptp@lysator.liu.se>**20060616160213]