/usr/share/fish/completions/lua.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 3 4 5 6 7 | complete -c lua -s e -d 'Execute string' -x
complete -c lua -s l -d 'Require library' -xa "( find /usr/lib/lua/ -name \*.so -printf '%f\n' | sed 's/.so//' )"
complete -c lua -s i -d 'Enter interactive mode after executing script'
complete -c lua -s v -d 'Show version'
complete -c lua -s h -l help -d 'Print help and exit'
complete -c lua -a "(__fish_complete_suffix .lua)"
complete -c lua -a '-' -d 'Execute stdin and stop handling options'
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