From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: Remove old forgotten command: whatchanged
Date: Thu, 8 Aug 2013 17:11:10 -0700
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To: Damien Robert <damien.olivier.robert+gmane@gmail.com>
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>> The above section primarily explains the use of diff-tree and it was
>> appropriate back when git-whatchanged was a script.  The intent of
>> the whole document, not just this section, was to tickle the
>> curiousity of the users and encourage them to see how the above
>> "much more powerful" whatchanged was implemented by going to the
>> source.
>
> Well in this case you can say that the intent was successful since it made
> me read the source code ;)

No, it is a failure. "By going to the source" was meant for
"git-whatchanged.sh" source,
a scripted version of Porcelain, so that users can mimic what is done
in their script.

Reading C source would not help them.