From mboxrd@z Thu Jan  1 00:00:00 1970
From: Leo Famulari <leo@famulari.name>
Subject: Re: Error in config.scm
Date: Wed, 8 Jun 2016 20:34:12 -0400
Message-ID: <20160609003412.GA17766@jasmine>
References: <9fc1bcbc-196b-fd4a-dfbc-9db516e0ce2a@ninthfloor.org>
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To: Kete Foy <kete@ninthfloor.org>
Cc: help-guix@gnu.org

On Wed, Jun 08, 2016 at 11:18:39PM +0000, Kete Foy wrote:
> I got this error when trying to initialize the guix system:
> /mnt/etc/config.scm:8:0: error: source expression failed to match any
> pattern

You have to provide a list of mapped-devices, like this:

(mapped-devices (list (mapped-device
                        (source ...))))

The example in the manual is a too subtle, in my opinion.