Nguyen Thai Ngoc Duy <> writes:

> On Sat, Oct 27, 2012 at 7:33 PM, Junio C Hamano <> wrote:
>> Nguyen Thai Ngoc Duy <> wrote:
>>>Notice the --cc in the first line, which is combined diff. Usually
>>>combined-diff is between two points and one parent. Though somehow git
>>>passes 4 parents down combined-diff.c:show_combined_header, as you can
>>>see in the "index" line. I think we should fix rev parsing code as it
>>>does not make sense to pass 4 identical parents this way.
>> The two heads home from HEAD...HEAD the user has on the command line.
>> The user is getting exactly what she asked; there is nothing to fix.
> Is there any use case where HEAD...HEAD (or "..." alone) is actually useful?

That is an invalid question, implying a proposal that will introduce
more confusion to the users while hurting the code.

There is no use case where "cat A >>A" is actually useful, either,
but it does not mean "cat A >>A" should be special cased to do
something different from what it happens to do in line with the case
where "cat A >>B" does.  I think "diff ..." or "diff HEAD...HEAD"
are the same as that example.

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