Pulling from refs/remotes/ ?

Hi,

why can't I pull from a remote?  I can do 

  git log REMOTE-BRANCH
  git diff BRANCH REMOTE-BRANCH

etc. But pulling yields

 [hanwen@haring foobar]$ git pull . origin/nonrandr-setup
 error: no such remote ref refs/heads/origin/nonrandr-setup
 Fetch failure: .

also, "Fetch failure: .", what is that supposed to mean?

-- 
 Han-Wen Nienhuys - hanwen@xs4all.nl - http://www.xs4all.nl/~hanwen