AttributeError "'ResponseFile' object has no attribute 'readline'" in _read_prefix during pull

Reporting this as the trace suggested it might be helpful.

Jim

$ bzr pull
Using saved parent location: http+urllib://jeremy.visser.name/bzr/python-iview/
http+urllib://jeremy.visser.name/bzr/python-iview/ is permanently redirected to https+urllib://jeremy.visser.name/bzr/python-iview/
https+urllib://jeremy.visser.name/bzr/python-iview/ is permanently redirected to https+urllib://jeremy.visser.name/bzr/python-iview/
bzr: ERROR: exceptions.AttributeError: 'ResponseFile' object has no attribute 'readline'

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1141, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 1217, in run
    self.add_cleanup(branch_from.lock_read().unlock)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 2484, in lock_read
    self.repository.lock_read()
  File "/usr/lib/python2.7/dist-packages/bzrlib/repofmt/pack_repo.py", line 1803, in lock_read
    self._refresh_data()
  File "/usr/lib/python2.7/dist-packages/bzrlib/repofmt/pack_repo.py", line 1719, in _refresh_data
    self._pack_collection.reload_pack_names()
  File "/usr/lib/python2.7/dist-packages/bzrlib/repofmt/pack_repo.py", line 1467, in reload_pack_names
    first_read = self.ensure_loaded()
  File "/usr/lib/python2.7/dist-packages/bzrlib/repofmt/pack_repo.py", line 1087, in ensure_loaded
    for index, key, value in self._iter_disk_pack_index():
  File "/usr/lib/python2.7/dist-packages/bzrlib/index.py", line 546, in iter_all_entries
    self._buffer_all()
  File "/usr/lib/python2.7/dist-packages/bzrlib/index.py", line 464, in _buffer_all
    self._read_prefix(stream)
  File "/usr/lib/python2.7/dist-packages/bzrlib/index.py", line 558, in _read_prefix
    options_line = stream.readline()
AttributeError: 'ResponseFile' object has no attribute 'readline'

bzr 2.6.0dev2 on python 2.7.3rc2 (Linux-3.2.0-1-amd64-x86_64-with-debian-
    wheezy-sid)
arguments: ['/usr/bin/bzr', 'pull']
plugins: bash_completion[2.6.0dev2], bzrtools[2.5.0],
    changelog_merge[2.6.0dev2], launchpad[2.6.0dev2],
    netrc_credential_store[2.6.0dev2], news_merge[2.6.0dev2],
    po_merge[2.6.0dev2], weave_fmt[2.6.0dev2]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'en_AU'

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.