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[bug#27657] [PATCH 3/3] gnu: wayland: Add workaround for graphviz 2.40.1


From: Leo Famulari
Subject: [bug#27657] [PATCH 3/3] gnu: wayland: Add workaround for graphviz 2.40.1.
Date: Fri, 14 Jul 2017 15:28:50 -0400
User-agent: Mutt/1.8.3 (2017-05-23)

On Sat, Jul 15, 2017 at 12:46:12AM +0530, Arun Isaac wrote:
> Will do. I keep forgetting to return #t from phases. Can't Guix error
> out if #t is not returned from the phase?

Sometimes the code in a phase returns a useful value. A common example:

(zero? (system* "foo"))

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