/usr/share/fish/completions/vared.fish is in fish-common 2.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | complete -c vared -x -a "(set|sed -e 's/ /'\t'Variable: /')"
complete -c vared -s h -l help --description "Display help and exit"
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