1 http://mercurial.selenic.com/bts/issue1877

     2 

     3   $ hg init a

     4   $ cd a

     5   $ echo a > a

     6   $ hg add a

     7   $ hg ci -m 'a'

     8   $ echo b > a

     9   $ hg ci -m'b'

    10   $ hg up 0

    11   1 files updated, 0 files merged, 0 files removed, 0 files unresolved

    12   $ hg book main

    13   $ hg book

    14    * main                      0:cb9a9f314b8b

    15   $ echo c > c

    16   $ hg add c

    17   $ hg ci -m'c'

    18   created new head

    19   $ hg book

    20    * main                      2:d36c0562f908

    21   $ hg heads

    22   changeset:   2:d36c0562f908

    23   bookmark:    main

    24   tag:         tip

    25   parent:      0:cb9a9f314b8b

    26   user:        test

    27   date:        Thu Jan 01 00:00:00 1970 +0000

    28   summary:     c

    29   

    30   changeset:   1:1e6c11564562

    31   user:        test

    32   date:        Thu Jan 01 00:00:00 1970 +0000

    33   summary:     b

    34   

    35   $ hg up 1e6c11564562

    36   1 files updated, 0 files merged, 1 files removed, 0 files unresolved

    37   $ hg merge main

    38   1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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

    40   $ hg book

    41      main                      2:d36c0562f908

    42   $ hg ci -m'merge'

    43   $ hg book

    44      main                      2:d36c0562f908

    45