xref: /freebsd/bin/sh/tests/expansion/set-u3.0 (revision 214e3e09b3381e44bf5d9c1dcd19c4b1b923a796) 
1
2set -u
3unset x
4v=$( (eval ': $((x))') 2>&1 >/dev/null)
5[ $? -ne 0 ] && [ -n "$v" ]
6