1   $ hg init dir

     2   $ cd dir

     3   $ echo bleh > bar

     4   $ hg add bar

     5   $ hg ci -m 'add bar'

     6 

     7   $ hg cp bar foo

     8   $ echo >> bar

     9   $ hg ci -m 'cp bar foo; change bar'

    10 

    11   $ hg debugrename foo

    12   foo renamed from bar:26d3ca0dfd18e44d796b564e38dd173c9668d3a9

    13   $ hg debugindex bar

    14      rev    offset  length   base linkrev nodeid       p1           p2

    15        0         0       6      0       0 26d3ca0dfd18 000000000000 000000000000

    16        1         6       7      1       1 d267bddd54f7 26d3ca0dfd18 000000000000