--- /dev/null
+LANG=C
+LC_ALL=C
+
+: ${TMPDIR:=/tmp}
+GTDIR=$TMPDIR/extglob4-$$
+
+shopt -s extglob
+[ -d "${GTDIR}" ] || mkdir "${GTDIR}"
+cd "${GTDIR}" || {
+ echo "extglob4: cannot cd to ${GTDIR}"
+ exit 2
+}
+
+touch a b c .x .y .z
+echo .!(|.) # correct
+echo * # correct
+
+echo @(*|.!(|.)) # wrong, adds . and ..
+echo @(*|@(f)) # ??
+echo @(*|@(ff))
+
+cd /
+rm -rf $GTDIR
+
+[[ a = a*?(/)b ]] && echo bad match 1