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_blkdiscard_module()
{
	local cur prev OPTS
	COMPREPLY=()
	cur="${COMP_WORDS[COMP_CWORD]}"
	prev="${COMP_WORDS[COMP_CWORD-1]}"
	case $prev in
		'-o'|'--offset'|'-l'|'--length')
			COMPREPLY=( $(compgen -W "num" -- $cur) )
			return 0
			;;
	esac
	case $cur in
		-*)
			OPTS="-o --offset -l --length -s --secure -v --verbose -h --help -V --version"
			COMPREPLY=( $(compgen -W "${OPTS[*]}" -- $cur) )
			return 0
			;;
	esac
	local DEVS
	DEVS=''; while read dev; do DEVS+="$dev " ; done < <(lsblk -pnro name)
	COMPREPLY=( $(compgen -W "$DEVS" -- $cur) )
	return 0
}
complete -F _blkdiscard_module blkdiscard