I suspect this has the same problem I pointed out to Kristian's
attempt to make git-branch a built-in.
Subject: Re: [PATCH] Implement git-branch and git-merge-base as built-ins.
Date: Thu, 08 Jun 2006 11:53:48 -0700
Message-ID: <7vverbsclf.fsf@xxxxxxxxxxxxxxxxxxxxxxxx>
Namely, merge-base code is not set up to be called more than
once without cleaning things up.
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