bash/tests/nameref3.sub

# nameref requires changes to unset
bar=one
typeset -n foo=bar

# normal unset unsets both nameref and variable it references
unset foo
echo "expect <unset>"
recho ${bar-unset}
echo "expect <unset>"
recho ${foo-unset}

readonly bar=two
typeset -n foo=bar

unset foo	# this should fail because bar is readonly

echo "expect <two>"
echo ${bar-unset}
echo "expect <two>"
echo ${foo-unset}

# one question is what happens when you unset the underlying variable
qux=three
typeset -n ref
ref=qux

echo $ref
unset qux
echo ${ref-unset}
qux=four
echo ${ref-unset}