Your bug report

#20188: [wishlist] avoid unnecessary calls to substitute-binary

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 20188@debbugs.gnu.org.

-- 
20188: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20188
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