This file is indexed.

/usr/share/bash-completion/completions/delpart is in util-linux 2.29.2-1+deb9u1.

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

The actual contents of the file can be viewed below.

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_delpart_module()
{
	local cur prev OPTS
	COMPREPLY=()
	cur="${COMP_WORDS[COMP_CWORD]}"
	prev="${COMP_WORDS[COMP_CWORD-1]}"
	case $prev in
		'-h'|'--help'|'-V'|'--version')
			return 0
			;;
	esac
	case $COMP_CWORD in
		1)
			OPTS="--help --version $(lsblk -pnro name)"
			COMPREPLY=( $(compgen -W "${OPTS[*]}" -- $cur) )
			;;
		2)
			prev="${COMP_WORDS[COMP_CWORD-1]}"
			COMPREPLY=( $(compgen -W "$(cat /sys/block/${prev##*/}/*/partition 2>/dev/null)" -- $cur) )
			;;
	esac
	return 0
}
complete -F _delpart_module delpart