From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 3/3] Revert "bash prompt: avoid command substitution when finalizing gitstring"
Date: Wed, 21 Aug 2013 18:27:21 -0700
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Brandon Casey <drafnel@gmail.com> writes:

> Why is "${var-}" necessary?  Wouldn't that be equivalent to "${var}"
> or "$var"?

set -u