Antoine Pitrou added the comment:

> Could you please provide an example which uses this feature?

A generic example is to parse messages out of a TCP stream. Basically
any protocol transported on TCP needs such a facility, or has to find
workarounds (which are either suboptimal or complicated).

Mercurial has another implementation strategy for a similar thing:
http://selenic.com/repo/hg/file/50d721553198/mercurial/util.py#l935

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