t.Errorf("got x = %s, want 0/1", s)
	}

	if s := x.RatString(); s != "0" {
		t.Errorf("got x = %s, want 0", s)
	}

	z.Add(&x, &y)
	if s := z.RatString(); s != "0" {
		t.Errorf("got x+y = %s, want 0", s)
	}

	z.Sub(&x, &y)
	if s := z.RatString(); s != "0" {
		t.Errorf("got x-y = %s, want 0", s)
	}

	z.Mul(&x, &y)
	if s := z.RatString(); s != "0" {
		t.Errorf("got x*y = %s, want 0", s)
	}

		x, ok := new(Rat).SetString(test.in)

		if ok {
			if !test.ok {
				t.Errorf("#%d SetString(%q) expected failure", i, test.in)
			} else if x.RatString() != test.out {
				t.Errorf("#%d SetString(%q) got %s want %s", i, test.in, x.RatString(), test.out)
			}
		} else {
			if test.ok {
				t.Errorf("#%d SetString(%q) expected success", i, test.in)
			} else if x != nil {

	buf = append(buf, '/')
	if len(x.b.abs) != 0 {
		buf = x.b.Append(buf, 10)
	} else {
		buf = append(buf, '1')
	}
	return buf
}

// RatString returns a string representation of x in the form "a/b" if b != 1,
// and in the form "a" if b == 1.
func (x *Rat) RatString() string {
	if x.IsInt() {
		return x.a.String()
	}
	return x.String()
}

		{"(*Rat).IsInt", Method, 0},
		{"(*Rat).MarshalText", Method, 3},
		{"(*Rat).Mul", Method, 0},
		{"(*Rat).Neg", Method, 0},
		{"(*Rat).Num", Method, 0},
		{"(*Rat).Quo", Method, 0},
		{"(*Rat).RatString", Method, 0},
		{"(*Rat).Scan", Method, 0},
		{"(*Rat).Set", Method, 0},
		{"(*Rat).SetFloat64", Method, 1},
		{"(*Rat).SetFrac", Method, 0},
		{"(*Rat).SetFrac64", Method, 0},
		{"(*Rat).SetInt", Method, 0},

pkg math/big, method (*Rat) Mul(*Rat, *Rat) *Rat
pkg math/big, method (*Rat) Neg(*Rat) *Rat
pkg math/big, method (*Rat) Num() *Int
pkg math/big, method (*Rat) Quo(*Rat, *Rat) *Rat
pkg math/big, method (*Rat) RatString() string
pkg math/big, method (*Rat) Scan(fmt.ScanState, int32) error
pkg math/big, method (*Rat) Set(*Rat) *Rat
pkg math/big, method (*Rat) SetFrac(*Int, *Int) *Rat