From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: Odd "git diff" breakage
Date: Mon, 31 Mar 2014 11:30:55 -0700
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To: Linus Torvalds <torvalds@linux-foundation.org>
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	(Linus Torvalds's message of "Mon, 31 Mar 2014 11:05:06 -0700")
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Linus Torvalds <torvalds@linux-foundation.org> writes:

> I hit this oddity when not remembering the right syntax for --color-words..
>
> Try this (outside of a git repository):
>
>    touch a b
>    git diff -u --color=words a b
>
> and watch it scroll (infinitely) printing out
>
>    error: option `color' expects "always", "auto", or "never"
>
> forever.
>
> I haven't tried to root-cause it, since I'm supposed to be merging stuff..
>
>                 Linus

Hmph, interesting.  "outside a repository" is the key, it seems.
And I can see it all the way down to 1.7.3 (at least).