[PATCH 1 of 2] graft: find ancestors of destination lazily

[Augie Fackler]

On Apr 6, 2013, at 11:15 PM, Siddharth Agarwal <sid0 at fb.com> wrote:

> +    ancestors = repo.changelog.ancestors([crev], inclusive=True)

Could this set be very large, and be worth set()ing before doing all those membership checks?
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