/usr/share/fish/completions/rmdir.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 | #Completions for rmdir
complete -x -c rmdir -a "(__fish_complete_directories (commandline -ct))"
complete -c rmdir -l ignore-fail-on-non-empty --description "Ignore errors from non-empty directories"
complete -c rmdir -s p -l parents --description "Remove each component of path"
complete -c rmdir -s v -l verbose --description "Verbose mode"
complete -c rmdir -l help --description "Display help and exit"
complete -c rmdir -l version --description "Display version and exit"
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