This file is indexed.

/usr/share/bash-completion/completions/pkgnames is in devscripts 2.16.2ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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_pkg_names()
{
    local cur prev opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"

    COMPREPLY=( $( apt-cache pkgnames $cur 2> /dev/null ) )

    return 0
}

complete -F _pkg_names wnpp-alert wnpp-check mk-build-deps rmadison mass-bug debsnap dd-list build-rdeps who-uploads transition-check getbuildlog dcontrol grep-excuses rc-alert whodepends dget pts-subscribe pts-unsubscribe