}

func loopAtEOFSplit(data []byte, atEOF bool) (advance int, token []byte, err error) {
	if len(data) > 0 {
		return 1, data[:1], nil
	}
	return 0, data, nil
}

func TestDontLoopForever(t *testing.T) {
	s := NewScanner(strings.NewReader("abc"))
	s.Split(loopAtEOFSplit)
	// Expect a panic
	defer func() {
		err := recover()
		if err == nil {
			t.Fatal("should have panicked")
		}