readline fix for rl_undo_list pointer aliasing; arith command sets word_top

tests/func.right

@@ -166,4 +166,27 @@ after FUNCNEST unset: f = 201
 ./func4.sub: line 23: foo: maximum function nesting level exceeded (20)
 1
 after FUNCNEST assign: f = 38
+11111 () 
+{ 
+    printf "FUNCNAME: %s\n" $FUNCNAME
+}
+function a=2 () 
+{ 
+    printf "FUNCNAME: %s\n" $FUNCNAME
+}
+function 11111 () 
+{ 
+    printf "FUNCNAME: %s\n" $FUNCNAME
+}
+function a=2 () 
+{ 
+    printf "FUNCNAME: %s\n" $FUNCNAME
+}
+FUNCNAME: a=2
+break is a function
+break () 
+{ 
+    echo FUNCNAME: $FUNCNAME
+}
+FUNCNAME: break
 5

tests/func.tests

@@ -166,6 +166,7 @@ export -f zf
 
 ${THIS_SH} -c 'type -t zf'
 ${THIS_SH} -c 'type zf'
+unset -f zf
 
 ${THIS_SH} ./func1.sub
 
@@ -179,6 +180,9 @@ ${THIS_SH} ./func3.sub
 # FUNCNEST testing
 ${THIS_SH} ./func4.sub
 
+# function naming restrictions
+${THIS_SH} ./func5.sub
+
 unset -f myfunction
 myfunction() {
     echo "bad shell function redirection"

tests/func5.sub

@@ -0,0 +1,38 @@
+#   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/>.
+#
+
+function a=2
+{
+	printf "FUNCNAME: %s\n" $FUNCNAME
+}
+
+function 11111
+{
+	printf "FUNCNAME: %s\n" $FUNCNAME
+}
+
+declare -f
+set -o posix
+declare -f
+set +o posix
+
+a\=2
+
+break()
+{
+	echo FUNCNAME: $FUNCNAME
+}
+
+type break
+\break

tests/parser.tests

@@ -1,5 +1,12 @@
 # catch-all for parsing problems that don't fit anywhere else
 
+# word_top issues in bash-5.2
+case x in x) if ((1)); then :; fi ;; esac
+case x in x) if ((1)); then :; fi esac
+
+case x in x) if ((true ) ); then :; fi ;; esac
+case x in x) if ((true ) ); then :; fi esac
+
 # this has to be in a separate file to get desired EOF behavior
 ${THIS_SH} ./parser1.sub