1 % no working directory

     2 adding a

     3 adding b

     4 % hg parents

     5 changeset:   2:6cfac479f009

     6 tag:         tip

     7 user:        test

     8 date:        Thu Jan 01 00:00:02 1970 +0000

     9 summary:     b

    10 

    11 % hg parents a

    12 changeset:   0:b6a1406d8886

    13 user:        test

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

    15 summary:     ab

    16 

    17 % hg parents -r 2

    18 changeset:   1:d786049f033a

    19 user:        test

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

    21 summary:     a

    22 

    23 % hg parents -r 2 a

    24 changeset:   0:b6a1406d8886

    25 user:        test

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

    27 summary:     ab

    28