80   2  test  add b

    80   2  test  add b

    81   1  test  modify a again

    81   1  test  modify a again

    82   0  default  add a again

    82   0  default  add a again

    83   $ hg update default

    83   $ hg update default

    84   1 files updated, 0 files merged, 1 files removed, 0 files unresolved

    84   1 files updated, 0 files merged, 1 files removed, 0 files unresolved

    85   $ hg bookmark bar

    86   $ hg bookmark bar

    86   $ cat .hg/undo.branch ; echo

    87   $ cat .hg/undo.branch ; echo

    87   test

    88   test

    88   $ hg rollback -f

    89   $ hg rollback -f

    89   repository tip rolled back to revision 1 (undo commit)

    90   repository tip rolled back to revision 1 (undo commit)