From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 2/2] branch: let branch filters imply --list
Date: Thu, 31 Jan 2013 09:02:00 -0800
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References: <20130131064357.GA24660@sigill.intra.peff.net>
 <20130131064611.GB25315@sigill.intra.peff.net> <1504250.y8BAS4sG2O@al>
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Cc: Jeff King <peff@peff.net>, git@vger.kernel.org
To: Peter Wu <lekensteyn@gmail.com>
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Peter Wu <lekensteyn@gmail.com> writes:

> One note, the following command spits out master without complaining about the 
> non-existing branch name:
>
>     git branch --contains <id> master <non-existant branch name>
>
> (the order of branches doesn't affect the result.)

That is perfectly normal.

What you gave after "--contains <id>" are *not* branch names.  They
are patterns against branch names that fits the given criteria (in
this case "--contains <id>") are matched, and the branches that do
not match any of the patterns will not appear in the result.