/usr/share/fish/completions/exit.fish is in fish-common 2.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | complete -c exit -s h -l help --description 'Display help and exit'
complete -c exit -x -a 0 -d "Quit with normal exit status"
complete -c exit -x -a 1 -d "Quit with abnormal exit status"
|