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From:   Junio C Hamano <gitster@pobox.com>
To:     Carlo Arenas <carenas@gmail.com>
Cc:     gitmailinglist.bentolor@xoxy.net, git@vger.kernel.org
Subject: Re: Should `@` be really a valid git tag name?
References: <0c68d628-e093-1cbd-e3bd-38a827545418@gmx.net>
        <CAPUEspjbiNtffXatzNUUFYyZKRjcqetOTVqQX+MgZf_AJq9hnA@mail.gmail.com>
Date:   Fri, 17 Sep 2021 13:53:52 -0700
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        (Carlo Arenas's message of "Fri, 17 Sep 2021 11:20:14 -0700")
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Carlo Arenas <carenas@gmail.com> writes:

> On Fri, Sep 17, 2021 at 7:12 AM <gitmailinglist.bentolor@xoxy.net> wrote:
>>
>> A SO commenter pointed out, that git-check-ref-format forbids @ and
>> maybe I should report this as a potential bug. Is it?
>
> a reference that is named "@" only is invalid, but refs/tags/@ is not.

;-)  

"git check-ref-format master ; echo $?" would show that any single
level name is "forbidden", so probably the SO commenter (whatever
that is) was confused---it is not about @ at all.

In any case, a tag whose name is @ may be another source of
confusion in the modern world, after we added @ as a synonym to
HEAD.  I do not know, for example, offhand which between the HEAD or
that tag "git show @" would choose.  It makes sense to avoid it.