$ hg log -r 2:4
changeset:
user: Bryan O'Sullivan <bos@serpentine.com>
summary: Introduce a typo into hello.c.
changeset:
user: Bryan O'Sullivan <bos@serpentine.com>
summary: Get make to generate the final binary from a .o file.
changeset:
tag: tip
user: Bryan O'Sullivan <bos@serpentine.com>
summary: Trim comments.