1 adding a

     2 marked working directory as branch b

     3 adding b

     4 0 files updated, 0 files merged, 1 files removed, 0 files unresolved

     5 fast-forward

     6 1 files updated, 0 files merged, 0 files removed, 0 files unresolved

     7 (branch merge, don't forget to commit)

     8 bogus fast-forward should fail

     9 abort: there is nothing to merge, just use 'hg update' or look at 'hg heads'

    10 done