Files renamed to themselves

Recipe:

hg clone ssh://<email address hidden>/yminsky/ocaml-core
cd ocaml-core
bzr st

The last command reports many renaming of files to themselves. It also says that “branch” is not known but there is actually no such file.

renamed:
  base/async/.hgignore.in => base/async/.hgignore.in
  base/async/core/.hgignore.in => base/async/core/.hgignore.in
 ...
unknown:
  branch