Adding upstream version 5.2.37.

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

tests/array14.sub

@@ -0,0 +1,43 @@
+#   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/>.
+#
+# start at a test suite for negative indexed array subscripts -- post bash-4.2
+x=( 0 1 2 3 4 5)
+declare -p x
+
+unset 'x[-1]'
+declare -p x
+
+unset 'x[-2]'
+declare -p x
+
+unset 'x[-10]'
+
+x[-2]=3
+declare -p x
+
+x+=( five )
+declare -p x
+x[-1]=5
+declare -p x
+
+x+=( [-1]=foo )
+declare -p x
+
+x[-1]=5
+declare -p x
+
+x[-2]+=four
+declare -p x
+
+echo "strlen(${x[-2]})" = ${#x[-2]}