set-u3.0   [plain text]

# $FreeBSD: head/bin/sh/tests/expansion/set-u3.0 221463 2011-05-04 22:12:22Z jilles $

set -u
unset x
v=$( (eval ': $((x))') 2>&1 >/dev/null)
[ $? -ne 0 ] && [ -n "$v" ]