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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 with `unset' and `[' and ']' subscripts
+
+declare -A A
+rkey=']'
+lkey='['
+
+A[$rkey]=rbracket
+A[$lkey]=lbracket
+declare -p A
+
+unset A[$rkey]
+unset A[$lkey]
+declare -p A
+
+A["$rkey"]=rbracket
+A["$lkey"]=lbracket
+declare -p A
+
+unset A["$rkey"]
+unset A["$lkey"]
+declare -p A
+
+A[\]]=rbracket
+A[\[]=lbracket
+declare -p A
+
+unset A[\]]
+unset A[\[]
+declare -p A
+
+A[']']=rbracket
+A['[']=lbracket
+declare -p A
+
+unset A[']']
+unset A['[']
+declare -p A
+
+A["]"]=rbracket
+A["["]=lbracket
+declare -p A
+
+unset A["]"]
+unset A["["]
+declare -p A