From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Kost <alezost@gmail.com>
Subject: Re: [PATCH 1/3] emacs: Display guix command errors in the minibuffer.
Date: Mon, 14 Sep 2015 10:22:46 +0300
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In-Reply-To: <1442173161-527-2-git-send-email-alezost@gmail.com> (Alex Kost's
	message of "Sun, 13 Sep 2015 22:39:19 +0300")
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Alex Kost (2015-09-13 22:39 +0300) wrote:

[...]
>  (define (guix-command-output . args)
> -  "Return string with 'guix ARGS ...' output."
> -  (with-output-to-string
> -    (lambda () (apply guix-command args))))
> +  "Return 2 strings with 'guix ARGS ...' output and error output."
> +  (output+error
> +   (lambda ()
> +     (guix-warning-port (current-error-port))
> +     (apply guix-command args))))

Ouch, it should be:

   (lambda ()
     (parameterize ((guix-warning-port (current-error-port)))
       (apply guix-command args)))

-- 
Alex