var buf Buffer
	s := ""
	for i := 0; i < 50; i++ {
		wlen := rand.Intn(len(testString))
		if i%2 == 0 {
			s = fillString(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, testString[0:wlen])
		} else {
			s = fillBytes(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, testBytes[0:wlen])
		}

		rlen := rand.Intn(len(testString))
		fub := make([]byte, rlen)
		n, _ := buf.Read(fub)
		s = s[n:]
	}

}

var makeFieldsInput = func() []byte {
	x := make([]byte, 1<<20)
	// Input is ~10% space, ~10% 2-byte UTF-8, rest ASCII non-space.
	r := rand.New(rand.NewSource(99))
	for i := range x {
		switch r.Intn(10) {
		case 0:
			x[i] = ' '
		case 1:
			if i > 0 && x[i-1] == 'x' {
				copy(x[i-1:], "χ")
				break
			}
			fallthrough
		default:
			x[i] = 'x'
		}
	}
	return x

<< 52) - 1, } ) func generateWeirdFieldEl(rand *mathrand.Rand) Element { return Element{ weirdLimbs52[rand.Intn(len(weirdLimbs52))], weirdLimbs51[rand.Intn(len(weirdLimbs51))], weirdLimbs51[rand.Intn(len(weirdLimbs51))], weirdLimbs51[rand.Intn(len(weirdLimbs51))], weirdLimbs51[rand.Intn(len(weirdLimbs51))], } } func (Element) Generate(rand *mathrand.Rand, size int) reflect.Value { if rand.Intn(2) == 0 { return reflect.ValueOf(generateWeirdFieldEl(rand)) } return reflect.ValueOf(generateFieldElement(rand))...