I created a new directory on a remote server named "hanford", and ran  
darcs init therein.  (hanford has darcs 1.0.8.)

Then I ran "darcs push -a" from a different computer to try to push  
stuff into that repo on hanford.  The different computer is running  
darcs 1.0.9.

I got this:

-------
wonwin-mcbrootles-computer:~/playground/darcs$ time darcs push -a  
zooko@dev.allmydata.com:src/darcs/1.0.9/ 2>&1 | tee log
Pushing to "zooko@dev.allmydata.com:src/darcs/1.0.9/"...
push_cmd: a patch set contained Nothing. This may indicate that the  
repository: zooko@dev.allmydata.com:src/darcs/1.0.9/ is incorrect.

real    0m1.032s
user    0m0.146s
sys     0m0.052s

Any --partial repositories involved?

> Eric Kow <eric.kow@gmail.com> added the comment:
>
> Any --partial repositories involved?

Hm...  I guess the darcs repository I have here is probably a  
partial.  That's the one that I'm trying to push to remote.

--Z

Ah, thanks.  Please let us know if it works better pushing non-partial repos.

As this appears a be a "--partial" related bug, I believe it is considered
"resolved-in-unstable" by using --lazy instead.