x := makeFloat(f)
		r := new(Rat)
		if res, _ := x.Rat(r); res != r {
			t.Errorf("(%s).Rat is not using supplied *Rat", f)
		}
	}
}

func TestFloatAbs(t *testing.T) {
	for _, test := range []string{
		"0",
		"1",
		"1234",
		"1.23e-2",
		"1e-1000",
		"1e1000",
		"Inf",
	} {
		p := makeFloat(test)
		a := new(Float).Abs(p)