Hi all, I found my Emacs using a fill-column value of 85 while hacking on the guix source tree.
Turns out it's an interaction between the emacs package editorconfig-mode (which I use). Easy workaround: turn this mode off when hacking on guix. A contradiction between .dir-locals.el and the .editorconfig file in guix exists: max_line_length of 85 in .editorconfig for most files in guix vs fill-column of 78 in dir-locals.el for all files in guix I don't know which of these values is supposed to be leading, or whether they configure the exact same thing in all situations. Cheers, Jelle