[BUG?] git range-diff -Ix @{1}... segfaults

From: Junio C Hamano <gitster@pobox.com>
Date: Sep 3, 2021, 18:49 UTC
Message-ID: <xmqqbl59fq9i.fsf@gitster.g>

It does not seem to trigger with an empty range, e.g.

    $ git range-diff -Ix HEAD...
    $ git range-diff -Ix HEAD~...
    -:  ---------- > 1:  0a0bc7d03a scalar: accept -C and -c opt...

but when it needs real comparison, the -I seems to kill the command quite easily.

THanks.

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