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))

echo !(f)
echo !(f)!(f)

shopt -s dotglob
echo @(*|@(f))
echo @(*|@(ff))

cd $OLDPWD
rm -rf $GTDIR

[[ a = a*?(/)b ]] && echo bad match 1