From: Junio C Hamano <hidden> Date: 2016-06-15 22:42:32
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: [ref]
Namely, merge-base code is not set up to be called more than
once without cleaning things up.