failures=0
i=1
set -f
while [ "$i" -le 127 ]; do
	# A different byte still in the range 1..127.
	i2=$((i^2+(i==2)))
	# Add a character to work around command substitution's removal of
	# final newlines, then remove it again.
	c=$(printf \\"$(printf %o@ "$i")")
	c=${c%@}
	c2=$(printf \\"$(printf %o@ "$i2")")
	c2=${c2%@}
	IFS=$c
	set -- $c2$c$c2$c$c2
	if [ "$#" -ne 3 ] || [ "$1" != "$c2" ] || [ "$2" != "$c2" ] ||
	    [ "$3" != "$c2" ]; then
		echo "Bad results for separator $i (word $i2)" >&2
		: $((failures += 1))
	fi
	i=$((i+1))
done
exit $((failures > 0))