API question: ancestors of B that are not ancestors of A

[Sune Foldager]

Nicolas Dumazet wrote:
> I find this very interesting. A killer feature to integrate within a
> bug tracker.
> I'm already imagining hooks flying off repos to trackers for automated
> reports; something that would make many engineers cry tears of joy and
> switch to mercurial for *this* feature.

As a note, we have a script doing exactly the same to extract changelogs
at work. It's based on the set(ancestors of A) - set(ancestors of B)
approach.

-Sune