git branch -M" regression in 1.7.7?

From: ☂Josh Chia (谢任中) <joshchia@gmail.com>
Date: Nov 26, 2011, 00:36 UTC
Message-ID: <CALxtSbRbwkVDKJcXiKY9rHYCjA3XGgCytbXQnRhQvbEnY8SpjA@mail.gmail.com>

On git 1.7.7.3, when I try to "git branch -M master" when I'm already on a branch 'master', I get this error message: Cannot force update the current branch

On 1.7.6.4, the command succeeds.

Is this intended?

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