242   $ mkdir c

   243   $ echo c > c/c

   244   $ hg add c/c

   245   $ hg ci -m 'c/c'

   246 BROKEN: This should be a conflict, should not crash

   247   $ hg rebase -r . -d 3 -n 2>&1 | grep KeyError

   248   KeyError: 'c'

   249 BROKEN: This should be a conflict, should not crash

   250   $ hg rebase -r 3 -d . -n 2>&1 | grep KeyError

   251   KeyError: 'c/c'