Junio C Hamano wrote:
> Just making sure.  HEAD@{$n} and @{$n} for non-negative $n mean
> totally different things.  @{0} and HEAD@{0} are almost always the
> same, and @{1} and HEAD@{1} may often happen to be the same, but as
> a blanket statement, I find "Since HEAD is implicit in @{}" very
> misleading.

When will they be different?  I'm looking at this from the parser's
point of view: when the part before @{} is missing, we dwim a "HEAD".

> As you and Felipe seem to be aiming for the same "Let's allow users
> to say '@' when they mean HEAD", I'll let you two figure the best
> approach out.

I've solved the problem in the general case of symbolic-refs and made
"@" a special case of that.

> One productive way forward might be to come up with a common test
> script pieces to document what constructs that spell @ in place of
> HEAD should be supported,

It's sufficient to test that symbolic refs work properly.  @ is a
trivial implementation of a pseudo symbolic-ref (see [5/5]).

> and much more importantly, what constructs
> that happen to have @ in them should not mistakenly trigger the new
> machinery.

At the parsing level, @ can only ever interfere with @{}; I've added
tests for those.
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