See issue154

I wish darcs would detect when a patch was bad/unapplicable (for example, remove
a non-empty directory).  Instead of blowing up, it would just refuse to pull the
patch.

I'm not sure if there is a practical way to do this.  Darcs repair seems to do
it, but maybe it just conflates the-patch-is-bad with something-went-wrong.

kowey, 

Could you provide an example of the triggering behavior, or is really the same
issue as the "issue154" that you referenced? 

  Mark

I'm going to go ahead and marked this as resolved-in-unstable, since it sounds
like the issue154 case, where directory-deleting/conflicting patches are handled
more gracefully now.

If there's a specific kind of other bad patch that darcs isn't handling
gracefully on pull, let's handle that as a new ticket.