#   This program is free software: you can redistribute it and/or modify
#   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/>.
#
declare -n ref=XXX[0]
mapfile ref <<< $'1\n2'
declare -p XXX[0]

unset -n ref

declare -n ref=XXX[0]
declare -A ref
ref[foo]=bar
declare -p XXX[0]

unset -n ref
unset XXX

typeset -n ref=XXX[0]
typeset ref=4

typeset -p ref XXX

unset -n ref
unset XXX

declare -n ref=XXX[0]
ref+=([2]=x)
declare -p ref XXX[0]
unset -n ref

declare -n ref=XXX[0]
read -a ref <<< "A B C"
declare -p XXX[0]
unset -n ref

declare -n ref=XXX[0]
unset ref
ref=()
declare -p ref

coproc ref { :; }; declare -p ${!ref}
wait

unset -n ref

declare -n ref=var[123]
unset ref
declare ref=
declare -p ref ${!ref} var

unset ref 
declare ref+=
declare -p ref ${!ref} var

declare +t ref
ref=X
declare -p ref ${!ref} var

unset -n ref
unset var

arr=(1 2 3)

indir='arr[@]'
declare -n ref='arr[@]'

recho "${!indir}"
recho ${!indir}

recho "$ref"
recho $ref

recho "${!indir}$ref"