xref: /freebsd/bin/sh/tests/expansion/set-u3.0 (revision 02e9120893770924227138ba49df1edb3896112a) 
1
2set -u
3unset x
4v=$( (eval ': $((x))') 2>&1 >/dev/null)
5[ $? -ne 0 ] && [ -n "$v" ]
6