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+# 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/>.
+#
+
+# test behavior of builtins that can take array subscript arguments, make
+# sure they work in the presence of associative arrays and `problematic' keys
+# if assoc_expand_once is set
+#
+# affected builtins: printf, read, wait
+
+declare -A A
+rkey=']'
+lkey='['
+
+shopt -s assoc_expand_once
+
+printf -v A[$rkey] rbracket
+printf -v A[$lkey] lbracket
+declare -p A
+
+unset A[$rkey]
+unset A[$lkey]
+declare -p A
+
+unset A
+declare -A A
+
+read A[$rkey] <<<rbracket
+read A[$lkey] <<<lbracket
+declare -p A
+
+unset A[$rkey]
+unset A[$lkey]
+declare -p A
+
+unset A
+declare -A A
+
+{ sleep 1 ; exit 4; } &
+{ sleep 2 ; exit 5; } & bgpid1=$!
+{ sleep 4 ; exit 6; } &
+
+wait -p A[$rkey] -n %2 %3
+case "${A[$rkey]}" in
+$bgpid1) echo $?: ok 1;;
+*) echo bad 1;;
+esac
+
+exit 0