From: Simon Ruderich <simon@ruderich.org>
Date: Thu, 22 Jun 2017 12:44:58 GMT
Subject: No "invalid option" message with git diff --cached --invalid-option
Message-ID: <20170622124458.ilokr7acas2bzq4z@ruderich.org>

Hello,

I'm using Git 2.13.1 (from the Debian sid repository) and noticed
the following issue when upgrading.

    $ git diff --compaction-heuristic
    error: invalid option: --compaction-heuristic

    $ git diff --cached --compaction-heuristic
    usage: git diff [<options>] [<commit> [<commit>]] [--] [<path>...]

I know that --compaction-heuristic is no longer supported but I
was using it an alias and was confused that I got no proper error
message warning me which option was wrong.

It seems to happen for any invalid option which is used in
combination with --cached or --staged.

Regards
Simon
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