oIFS=$IFS

set -- ''

unset v
recho ${v= ''}
recho $v
unset v
recho ${v=''}
recho $v
unset v
recho ${v= $*}
recho $v
unset v
recho ${v=$*}
recho $v
unset v
recho ${v='' }
recho $v
unset v
recho ${v= '' }
recho $v
unset v
recho ${v=$* }
recho $v
unset v
recho ${v= $* }
recho $v

unset IFS

unset v
recho ${v= ''}
recho $v
unset v
recho ${v=''}
recho $v
unset v
recho ${v= $*}
recho $v
unset v
recho ${v=$*}
recho $v
unset v
recho ${v='' }
recho $v
unset v
recho ${v= '' }
recho $v
unset v
recho ${v=$* }
recho $v
unset v
recho ${v= $* }
recho $v

unset -v v
IFS=$oIFS

# This shouldn't output anything
set -- '' ''

unset -v v
recho ${v=$*}
unset -v v
recho ${v= $*}
unset -v v
recho ${v=$* }
unset -v v
recho ${v= $* }

unset -v v IFS
recho ${v=$*}
unset -v v
recho ${v= $*}
unset -v v
recho ${v= $* }
unset -v v
recho ${v= $*}