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zsh/Completion/Base/Utility/_guard

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#autoload
local mesg pat garbage
mesg=()
zparseopts -K -D -a garbage M: J: V: 1 2 n F: X:=mesg
[[ "$PREFIX$SUFFIX" != $~1 ]] && return 1
if [[ $# -gt 1 || $#mesg -eq 0 ]]; then
shift
_message "$*"
else
_message -r "$mesg[2]"
fi
[[ -n "$PREFIX$SUFFIX" ]]