Hello all, This is what breaks loading of the magit package in emacs227: (require 'cl) (cl-subseq '() 0 0) This triggers an infinite loop. From what I gathered ( https://lists.nongnu.org/archive/html/bug-gnu-emacs/2020-08/msg02623.html ), this was tagged a nixos bug, so maybe it is the same for guix. Best regards, divoplade