xref: /freebsd-13-stable/bin/sh/tests/expansion/set-u3.0 (revision 023fc80ee38a117fa65b2ccb2abf8bdc7dbd6fd9) 
1
2set -u
3unset x
4v=$( (eval ': $((x))') 2>&1 >/dev/null)
5[ $? -ne 0 ] && [ -n "$v" ]
6