From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Enge <andreas@enge.fr>
Subject: bug#20188: [wishlist] avoid unnecessary calls to substitute-binary
Date: Tue, 24 Mar 2015 10:58:45 +0100
Message-ID: <20150324095845.GA4120@debian.math.u-bordeaux1.fr>
References: <87twxbos7v.fsf@netris.org>
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To: Mark H Weaver <mhw@netris.org>
Cc: 20188@debbugs.gnu.org

An even worse example:

$ guix package --roll-back
substitute-binary: updating list of substitutes from 'http://hydra.gnu.org'...

Andreas