On Sat, Oct 27, 2012 at 7:33 PM, Junio C Hamano <gits...@pobox.com> wrote:
> Nguyen Thai Ngoc Duy <pclo...@gmail.com> 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?

I have re-read the git-diff man page and I don't think it explains
"git diff foo ... bar" syntax (from a user's point of view, not a git
guru's). We could improve the documentation if "git diff foo ... bar"
is useful, or reject it with an error to avoid confusion.
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