1# $FreeBSD: stable/11/bin/sh/tests/expansion/set-u3.0 221463 2011-05-04 22:12:22Z jilles $ 2 3set -u 4unset x 5v=$( (eval ': $((x))') 2>&1 >/dev/null) 6[ $? -ne 0 ] && [ -n "$v" ] 7