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#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# can we unset the nameref attribute on variables with values that reference
# unset variables?

unset bar
declare -n foo="bar"
declare -p foo

declare +n foo
declare -p foo bar

declare -n foo
declare -p foo

# let's try removing the nameref attribute -- other attributes and assignments
# apply to the nameref target

declare +n -i foo=7+4
declare -p foo bar

unset foo bar

# but if the nameref variable doesn't have a value, the attributes apply to
# the nameref variable itself. thanks ksh93

declare -n foo6
declare -xi foo6
declare -p foo6

# and when we remove the nameref attribute, the other attributes remain

declare +n foo6
declare -p foo6

unset foo6

# make sure these cases continue to work

# nameref referencing an existing, set variable
declare -n foo=bar
bar='Hello World!'
declare -p foo bar
declare +n foo
declare -p foo bar
unset foo bar

# nameref referencing an existing, unset variable
declare -n foo=bar
declare bar
declare -p foo bar
declare +n foo
declare -p foo bar

# but when we add the nameref attribute, we remove other attributes

declare -i ivar
ivar=4+4
echo $ivar

declare -n ivar=foo
declare -p ivar