# $FreeBSD: head/bin/sh/tests/expansion/question2.0 341164 2018-11-28 20:03:53Z jilles $

unset dummyvar
msg=`(: ${dummyvar?}) 2>&1`
r=$?
[ "$r" != 0 ] && case $msg in
*dummyvar?* | *?dummyvar*) : ;;
*)
	printf 'Bad message: [%s]\n' "$msg"
	exit 1
esac