Running `vc-print-log` on a directory containing the Emacs trunk gives
the following error:
bzr: ERROR: Path unknown at end or start of revision range: aclocal.m4
In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.4.2)
of 2013-12-14 on marvin
Bzr revision: 115528 tzz@lifelogs.com-20131214195519-pi759t6a59vg9b1i
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description: Linux Mint 13 Maya