Your bug report

#63634: nar 404 leads to hard ‘guix substitute’ crash

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 63634@debbugs.gnu.org.

-- 
63634: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63634
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems