$ \textbf{hg update 2}
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ \textbf{hg parents}
changeset:   
user:        Bryan O'Sullivan <bos@serpentine.com>

summary:     Introduce a typo into hello.c.

$ \textbf{hg update}
2 files updated, 0 files merged, 0 files removed, 0 files unresolved