If we are not rebasing with --root, then $# can only be either 1 (base)
or 2 (base and the name of the branch to be rebased).
If we are rebasing with --root, then it is Ok if $# is 0 (rebase the
current branch down to everything) or 1 (rebase the named branch down to
everything).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Acked-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>