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guix-package --roll-back

From: Nikita Karetnikov
Subject: guix-package --roll-back
Date: Fri, 21 Dec 2012 17:49:29 -0500


What do you think?

(I'll send the output of 'git format-patch' when I implement the
command-line part.)

By the way, could you explain how the following works?

  (match (scandir (dirname profile)
                  (cut regexp-exec %profile-rx <>)) ...)

How does 'regexp-exec' get its second argument? (I know how 'cut' works,
but I don't understand this particular snippet.)


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