Adding upstream version 5.2.37.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

tests/array21.sub

@@ -0,0 +1,50 @@
+#   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/>.
+#
+typeset -a a
+a=(1 2 3 4)
+
+typeset -A A
+A=([one]=1 [two]=2 [three]=3 [four]=4)
+
+unset 'a[0]'
+typeset -p a
+
+scalar=abcd
+echo ${scalar[0]}
+
+unset 'scalar[0]'
+echo ${scalar-unset}
+
+unset 'a[@]'
+typeset -p a
+
+unset 'A[@]'
+typeset -p A
+
+typeset -a a
+a=(1 2 3 4)
+typeset -A A
+A=([one]=1 [two]=2 [three]=3 [four]=4)
+
+# supported, recommended way to unset all array elements
+a=()
+typeset -p a
+A=()
+typeset -p A
+
+declare -a foo
+declare foo='(1 2 3)'
+declare foo[1]='(4 5 6)'
+
+declare -p foo