/usr/share/fish/completions/wc.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 | complete -c wc -s c -l bytes --description "Print byte counts"
complete -c wc -s m -l chars --description "Print character counts"
complete -c wc -s l -l lines --description "Print newline counts"
complete -c wc -s L -l max-line-length --description "Print length of longest line"
complete -c wc -s w -l words --description "Print word counts"
complete -c wc -l help --description "Display help and exit"
complete -c wc -l version --description "Display version and exit"
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