From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ramkumar Ramachandra <artagnon@gmail.com>
Subject: [BUG] can't switch branches with submodules
Date: Sat, 9 Feb 2013 17:55:26 +0530
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Cc: Jens Lehmann <Jens.Lehmann@web.de>
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Hi,

I have two branches: master and gh-pages.  master has one submodule
called foo that gh-pages doesn't.  When I try to check out gh-pages
from master:

    warning: unable to rmdir foo: Directory not empty

And the foo directory exists in my worktree.  This is very annoying,
and I want to fix it now.  Where is this error coming from?  How does
the worktree get updated when I checkout?