/usr/share/fish/functions/delete-or-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 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #
# This function deletes a character from the commandline if it is
# non-empty, and exits the shell otherwise. Implementing this
# functionality has been a longstanding request from various
# fish-users.
#
function delete-or-exit
set -l cmd (commandline)
switch "$cmd"
case ''
exit 0
case '*'
commandline -f delete-char
end
end
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