From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH] Add new @ shortcut for HEAD
Date: Tue, 30 Apr 2013 10:54:25 -0700
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Cc: Felipe Contreras <felipe.contreras@gmail.com>, git@vger.kernel.org,
	Ramkumar Ramachandra <artagnon@gmail.com>,
	Michael J Gruber <git@drmicha.warpmail.net>,
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To: Jonathan Nieder <jrnieder@gmail.com>
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Jonathan Nieder <jrnieder@gmail.com> writes:

> Junio C Hamano wrote:
>> Felipe Contreras <felipe.contreras@gmail.com> writes:
>
>>> Never-mind, now I see the difference, still, I don't think it's
>>> relevant for this patch.
>>
>> I don't either. With the precedence of @{u}, @ does not need to have
>> anything to do with a reflog. It is just a random letter that casts
>> a magic spell.
>
> I thought the convention was "^{...} is for operators that act on
> objects, @{...} for operators that act on refs or symrefs".

Almost.  You can ask "git rev-parse --symbolic-full-name" to see
that @{-1} is still a ref, but @{1} is _not_ a ref (it is a concrete
revision that you cannot run 'update-ref' on).